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JavaScript - Help On Javascript Constructor Property
I had read from books that the constructor property of object is inherited from its prototype. And the prototype can be changed dynamically. New property can be added to or deleted from object even it was created before the prototype change. But I got confused on below codes.
Code: function A()
{
this.title = "A";
}
function B()
{
this.title = "B";
}
document.write("<br>");
var b = new B();
document.write(b.constructor);
document.write("<br>");
document.write(B.prototype.constructor);
document.write("<br>");
B.prototype = new A();
document.write(b.constructor); // Suppose to output "function A() ..."
document.write("<br>");
document.write(B.prototype.constructor);
document.write("<br>");
B.prototype.constructor = B;
document.write(b.constructor);
document.write("<br>");
document.write(B.prototype.constructor);
document.write("<br>");
But the actual result (both IE and firefox) is Code: function B() { this.title = "B"; }
function B() { this.title = "B"; }
function B() { this.title = "B"; }
function A() { this.title = "A"; }
function B() { this.title = "B"; }
function B() { this.title = "B"; }
Please help me. thanks. Similar TutorialsI am trying to understand why I had an error, or why my solution worked. In my HTML I had: Code: <script language="JavaScript" type="text/javascript" src="Book.js"></script> <script language="JavaScript" type="text/javascript" src="Book_TEST.js"></script> Book.js said: Code: function Book(title, author)
{
this.title = title;
this.author = author;
}
Book.prototype.toString = function()
{ return '"' + this.title + '" by '+ this.author; };
var Book = new Book ("John", "Dough");
alert (Book); // displays "John Dough"
And, predictably, at this stage, the code worked. Book.js said: Code: var myBook = new Book ("JavaScript Tutorials", "Herong Yang");
However, at this point the JavaScript would crash and I'd get an error "Error: Book is not a constructor javascript." I drove myself nuts trying to figure out why the code wasn't working at this later point. Eventually, I copied another object: Code: /*
* Person class
*/
/**
* Person constructor
*
* @param {String} first
* The person's first name
* @param {String} last
* The person's last name
*/
function Person(first, last)
{
this.first = first;
this.last = last;
}
/**
* Create a string representation of this object
*
* @return {String} A string representation of this object
*/
Person.prototype.toString = function()
{
return this.first + " " + this.last;
};
/*
var person = new Person ("John", "Dough");
alert (person); // displays "John Dough"
*/
and then used find and replace to swap {Person, first, last} with {Book, title, author}, resulting in: Code: /*
* Book class
*/
/**
* Book constructor
*
* @param {String} title
* The Book's title
* @param {String} author
* The Book's author
*/
function Book(title, author)
{
this.title = title;
this.author = author;
}
/**
* Create a string representation of this object
*
* @return {String} A string representation of this object
*/
Book.prototype.toString = function()
{ return '"' + this.title + '" by '+ this.author; };
var Book = new Book ("John", "Dough");
alert (Book); // displays "John Dough"
Now, the code worked fine in both script. (i.e., no more error.) So far as I can tell, the only differences between the first and next version of Book.js are the comments and the whitespace. Am I missing something? Can the comments or whitespace somehow effect the logic with which this code has been executing? If I get an error like this again, is there an easier/better way to fix it than to essentially retype the code? Thanks in advance for helping me to understand this. Hi All, I have a web application which has two DIV, one is main and one is child. I am having problem in printing multiple pages. There is a lot of data in the child DIV and i am using JavaScript functions to control the print functionality. When i print using window.print(), only the data on the main page currently being showed is printed. I further researched and checked out the Style.Overflow property. Now i am using divMain.style.overflow = "visible" After this the complete print comes. But in Firefox, the scroll bar disappears and only single page is left with no scroll bar . Now if after print i give divMain.style.overflow = "Auto" OR divMain.style.overflow = "Scroll", still the scroll bar doesn't come and if it comes then its inactive. I am unable to see the complete data on the page after the print is taken. The problem is not coming in I.E and the full data with scroll bar is recovered in I.E. Please help me how to get the normal page with full data and scroll bar after printing in Firefox. hi, i'm currently stumped by the following code. what's the point of using x.constructor.prototype? (highlighted in red) why not directly use x.prototype.classname to check whether 'classname' property is in this class? thx in advance Code: function getType(x) {
// If x is null, return "null"
if (x == null) return "null";
// Next try the typeof operator
var t = typeof x;
// If the result is not vague, return it
if (t != "object") return t;
// Otherwise, x is an object. Use the default toString( ) method to
// get the class value of the object.
var c = Object.prototype.toString.apply(x); // Returns "[object class]"
c = c.substring(8, c.length-1); // Strip off "[object" and "]"
// If the class is not a vague one, return it.
if (c != "Object") return c;
// If we get here, c is "Object". Check to see if
// the value x is really just a generic object.
if (x.constructor == Object) return c; // Okay the type really is "Object"
// For user-defined classes, look for a string-valued property named
// classname, that is inherited from the object's prototype
if ("classname" in x.constructor.prototype && // inherits classname
typeof x.constructor.prototype.classname == "string") // its a string
return x.constructor.prototype.classname;
// If we really can't figure it out, say so.
return "<unknown type>";
}
I need to detect the "name" of the constructor of an object. For example, myArray.constructor === Array is true, but I want something where that === 'Array' is true. I've heard of Object.constructor.name, but it's not widely compatible. Any ideas (preferably without involving regular expressions)? Thanks in advnce, Julian How to extend the constructor for the date object of the javasccript so that whenever a call is made to the constructor, I want to perform a particular action? Basically how to define wrappers for default javascript methods or objects like Date() so that I can perform some action and then invoke the original method? So basically if I have something like var a = new Date(); I want it to (say) alert the value of the date everything Date() is called and then execute the default date constructor. TIA I have a dice simulator. Basically, a user enters how many sides they want on their die, and then I digitally roll 2 of them. And produce the output in a document.writeln. I think I'm having trouble with the this.sides in the constructor function (in the head section). Also, I'm getting a syntax error in Safari : 25TypeError: 'null' is not an object (evaluating 'element.value') Am I not suppose to put the variable in the constructor function? Any help would be appreciated. <head> var element = document.getElementById("number"); var sides = element.value; function Die( ) { this.sides = sides; this.roll = function( ) { return parseInt((Math.random( ) * 1000) % this.sides) + 1; } } </script> </head> <body> <h1>Adam's Dice Rolling Game!</h1><br/> <form action="" method="post"> <p> <input type="text" name="number" id="number"/> </p> <p> <input type="button" value="Roll the dice!" id="roll_me"/> </p> </form> <script type="text/javascript"> var d = new Die( ); d.sides = sides; var rolled_value = d.roll( ); var r1 = document.getElementById( "roll_me" ); r1.onclick = function Die () { document.writeln ( d.roll () ); } </script> Hi - In am learning Javascript and trying to understand why, the following line : Code: arguments.callee.superclass cannot be replaced by : Code: this.constructor.superclass In the following code sample : ( the explanation given is that if someone creates a subclass of PositionedRectangle, then this.constructor will refer to the new subclass constructor, not to PositionedRectangle - but why? 'this' here to my knowledge represents the object 'PositionRectangle' and if not I can't understand why not. ) Code: // Here is a simple Rectangle class.
// It has a width and height and can compute its own area
function Rectangle(w, h) {
this.width = w;
this.height = h;
}
Rectangle.prototype.area = function( ) { return this.width * this.height; }
// Here is how we might subclass it
function PositionedRectangle(x, y, w, h) {
// First, invoke the superclass constructor on the new object
// so that it can initialize the width and height.
// We use the call method so that we invoke the constructor as a
// method of the object to be initialized.
// This is called constructor chaining.
PositionRectangle.superclass = Rectangle;
arguments.callee.superclass .call(this, w, h);
// Now store the position of the upper-left corner of the rectangle
this.x = x;
this.y = y;
}
// Create a prototype for the subclass that inherits from the prototype
// of the superclass.
function heir(p) {
function f(){}
f.prototype = p;
return new f();
}
PositionRectangle.prototype = heir(Rectangle.prototype);
PositionRectangle.prototype.constructor = PositionRectangle;
Hi All, Why is the Option constructor converting my text as follows? text = ' 1:30 pm' Option tag that gets generated: <option value="10">&nbsp;&nbsp;1:30 pm</option> How do I suppress the conversion of the & to & by the constructor? I've tried escaping the & but that's a no go. Thanks in advance for any help on this. JD ----------SOLUTION---------- ----------ORIGINAL PROBLEM---------- The second line of code. What does it do? It's confusing because it doesn't have a semicolon at the end and it doesn't end with (). Code: var centreicon = new GIcon(); centreicon.constructor centreicon.image = "http://maps.google.com/mapfiles/kml/pal3/icon31.png "; centreicon.shadow = "http://maps.google.com/mapfiles/kml/pal3/icon31s.png "; centreicon.iconSize = new GSize(12, 20); centreicon.shadowSize = new GSize(22, 20); centreicon.iconAnchor = new GPoint(6, 20); centreicon.infoWindowAnchor = new GPoint(5, 1); I found this on stackoverflow while trying to find a way to make my own icons on a map. With that being said. I'm still confused about how to apply the new graphic to a map. I don't see how they apply that picture to a coordinate. Does anyone know how to do that? Can I do this? Code: var centreicon = new GIcon(); centreicon.constructor centreicon.image = "http://maps.google.com/mapfiles/kml/pal3/icon31.png "; centreicon.shadow = "http://maps.google.com/mapfiles/kml/pal3/icon31s.png "; centreicon.iconSize = new GSize(12, 20); centreicon.shadowSize = new GSize(22, 20); centreicon.iconAnchor = new GPoint(6, 20); centreicon.infoWindowAnchor = new GPoint(5, 1); var marker = new GMarker( new GLatLng(-34.397, 150.644) , centreicon); map.addOverlay(marker); -------- A tad bit later -------- So this is the code I have on my testing site Even thought I'ved defined the the icon's image and location It does not show up on the map. What am I missing? Code: <!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script type="text/javascript"
src="http://maps.googleapis.com/maps/api/js?key=AIzaSyAWhjy3iZ8g6BZszj299c0yUY6ahKpSr1U&sensor=false">
</script>
<script type="text/javascript">
function initialize() {
var myOptions = {
center: new google.maps.LatLng(-34.397, 150.644),
zoom: 8,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map_canvas"),myOptions);
var centreicon = new GIcon();
centreicon.constructor
centreicon.image = "http://maps.google.com/mapfiles/kml/pal3/icon31.png ";
centreicon.shadow = "http://maps.google.com/mapfiles/kml/pal3/icon31s.png ";
centreicon.iconSize = new GSize(12, 20);
centreicon.shadowSize = new GSize(22, 20);
centreicon.iconAnchor = new GPoint(6, 20);
centreicon.infoWindowAnchor = new GPoint(5, 1);
var marker = new GMarker( new GLatLng(-34.397, 150.644) , centreicon);
map.addOverlay(marker);
}
</script>
</head>
<body onload="initialize()">
<div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>
Hello, I have the following object: Code:
var layers = {
photo1 : {
index : 1,
xPos : 63,
yPos : 48,
angle : 0
},
background : {
index : 0,
xPos : 278,
yPos : 163,
angle : 0
}
}
How can I sort the objects by the index property? Code: for(var layer in layers.sort(???))
{
}
Thx Very Much! I am and seem to remain newbie ... I have a JS script that presents a series of "pages" with different questions inside a single HTML file, by rewriting certain <div>s. I have an object like this that contains the questions and information about answer labels etc (the idea is that this should be easy to modify for someone who doesn't know JS): Code: var Questions = [
{
"question" : "How good is this?",
"labels" : ["excellent","very good","good","bad","very bad","awful"],
"page" : 0 ,
"random" : false ,
"type" : "default",
"varname" : "allgood"
},
{
"question" : Change[curCase]+"What do you think now?",
"labels" : BetterLabels,
"page" : 1 ,
"random" : true ,
"type" : "default",
"varname" : "betteradapt"
}
]
This object is initialized when the page loads, and a function reads the total number of pages by getting the maximum number of the "page" property across elements. Later, the object is accessed by thenextQuestion() function which uses the "page" property to looks whether each element belongs on the current page , then reads out the properties and presents the question. This works okay. Now the tricky bit: For some questions, their text should be different depending on which case is currently on the screen (Change[curCase]). curCase is different on each page, an integer between 0 and Change.length. I cannot get this to work for the Questions object, probably because the Questions object has been already initialized when the page loaded. How can I get my function nextQuestion() to "re-evaluate" the property "question" for all the elements of the Questions objectwhen nextQuestion() is called , using the current value of "curCase"? nextQuestion() is longer, but the (i think!) crucial bits are he Look whether question belongs on current page and push it onto new array: Code: for (i=0; i < Questions.length; i++) {
Questions[i].page = Questions[i].page;
if ( Questions[i].page == BlockNum ) { // if the q belongs on the current page
QuestionsObjectThisPage.push(Questions[i]);
}
}
Then, extract an array containing the questions, which will then be presented: Code: for (i=0; i < QuestionsObjectThisPage.length; i++) {
QuestionsThisPage.push(QuestionsObjectThisPage[i].question) ;
}
So what I'm looking for is something to change either of these two Object.push() functions so they don't simply take the value they find in the Questions (or QuestionsThisPage) object, but to re-evaluate the code for the "questions" property, taking into account the current value of curCase Phew. I found that really hard to describe; hope it's somewhat clear. I have this simple manual photo slide show. It shows four photos and when you click the next button and it moves one photo over and one photo back for the previous button. I have to moving by changing the CSS property of 'left' by 195 pixels each move. So for it to move next it will subtract 195 pixels from the left property and for moving back it add 195 pixels to the left property. I have the code setup so when you click it changes the property of left to either -195 or 195 pixels but I need it so it actually does the math, not just give it a set value. But I don't know how to do that. Code: function MM_changeProp(objId,x,theProp,theValue) { //v9.0
var obj = null; with (document){ if (getElementById)
obj = getElementById(objId); }
if (obj){
if (theValue == true || theValue == false)
eval("obj.style."+theProp+"="+theValue);
else eval("obj.style."+theProp+"='"+theValue+"'");
}
}
function nextPhoto() {
MM_changeProp('fanThumbWrapOne','','left','-195px','DIV')
}
function prevPhoto() {
MM_changeProp('fanThumbWrapOne','','left','195px','DIV')
}
so where you see -195px and 195px in the functions for nextPhoto and prevPhoto I need those to actually be functions where it subtracts 195px or adds 195px. For some reason I run my script and its saying missing } after property list. But I'm not seeing it. Code: <script type="text/javascript">
$(document).ready(function() {
$('div.message-error').hide();
$('div.message-success').hide();
$('ul#characterList').css( 'margin-left', '120px' );
$('li').remove('.characterName');
$("#handlerForm").validate({
rules: {
firstName: "required",
lastName: "required",
userName: {
required: true,
minlength: 2
},
password: {
required: true,
minlength: 5
},
password2: {
required: true,
minlength: 5,
equalTo: "#password"
},
email: {
required: true,
email: true
},
messages: {
firstName: "Please enter your firstname",
lastName: "Please enter your lastname",
userName: {
required: "Please enter a username",
minlength: "Your username must consist of at least 2 characters"
},
password: {
required: "Please provide a password",
minlength: "Your password must be at least 5 characters long"
},
password2: {
required: "Please provide a password",
minlength: "Your password must be at least 5 characters long",
equalTo: "Please enter the same password as above"
},
email: "Please enter a valid email address"
}
});
$("input.submit").click(function() {
var userID = $("input#userID").val();
var defaultChar = $("select#charactersDrop option:selected").text();
var userName = $("input#userName").val();
var firstName = $("input#firstName").val();
var lastName = $("input#lastName").val();
var email = $("input#email").val();
var statusID = $("select#statusID").val();
var isAdmin = $("select#isAdmin").val();
var liElements = $("ul#characterList li");
var characterIDList = "";
for( var i = 0; i < liElements.length; i++ ) {
var liElement = $( liElements[ i ] );
// only start appending commas in after the first characterID
if( i > 0 ) {
characterIDList += ",";
}
// append the current li element's characterID to the list
characterIDList += liElement.data( 'characterID' );
}
var dataString = 'userID=' + userID + 'userName=' + userName + '&password=' + password + '&firstName=' + firstName + '&lastName=' + lastName + '&email=' + email + '&statusID=' + statusID + '&isAdmin=' + isAdmin + '&characterIDList=' + characterIDList + '&submitHandler=True';
$.ajax({
type: "POST",
url: "processes/handler.php",
data: dataString,
success: function(myNewVar) {
if (myNewVar == 'good') {
$('div.message-error').hide();
$("div.message-success").html("<h6>Operation successful</h6><p>" + userName + " saved successfully.</p>");
$("div.message-success").show().delay(10000).hide("slow");
$(':input','#handlerForm')
.not(':submit, :button, :hidden')
.val('')
$('ul#characterList li').each(function() {
$(this).remove();
});
} else if (myNewVar == 'bad1') {
$('div.message-success').hide();
$("div.message-error").html("<h6>Operation unsuccessful</h6><p>" + userName + " already exists in the database.</p>");
$("div.message-error").show();
} else if (myNewVar == 'bad2') {
$('div.message-success').hide();
$("div.message-error").html("<h6>Operation unsuccessful</h6><p>" + email + " already exists in the database.</p>");
$("div.message-error").show();
} else if (myNewVar == 'bad3') {
$('div.message-success').hide();
$("div.message-error").html("<h6>Operation unsuccessful</h6><p>" + userName + " and " + email + " already exists in the database.</p>");
$("div.message-error").show();
} else if (myNewVar == 'bad1bad2') {
$('div.message-success').hide();
$("div.message-error").html("<h6>Operation unsuccessful</h6><p>" + userName + " and " + email + " already exists in the database.</p>");
$("div.message-error").show();
}
}
});
return false;
});
});
</script>
<!-- Form -->
<form action="#" id="handlerForm">
<fieldset>
<legend>Add New Handler</legend>
<div class="field required">
<label for="userName">User Name</label>
<input type="text" class="text" name="userName" id="userName" title="User Name"/>
<span class="required-icon tooltip" title="Required field - This field is required, it cannot be blank, and must contain something that is different from emptyness in order to be filled in. ">Required</span>
</div>
<div class="field required">
<label for="password">Password</label>
<input type="password" class="text" name="password" id="password" title="Password" />
<span class="required-icon tooltip" title="Required field - This field is required, it cannot be blank, and must contain something that is different from emptyness in order to be filled in. ">Required</span>
</div>
<div class="field required">
<label for="password2">Confirm Password</label>
<input type="password" class="text" name="password2" id="password2" title="Confirm Password" />
<span class="required-icon tooltip" title="Required field - This field is required, it cannot be blank, and must contain something that is different from emptyness in order to be filled in. ">Required</span>
</div>
<div class="field required">
<label for="firstName">First Name</label>
<input type="text" class="text" name="firstName" id="firstName" title="First Name"/>
<span class="required-icon tooltip" title="Required field - This field is required, it cannot be blank, and must contain something that is different from emptyness in order to be filled in. ">Required</span>
</div>
<div class="field required">
<label for="lastName">Last Name</label>
<input type="text" class="text" name="lastName" id="lastName" title="Last Name"/>
<span class="required-icon tooltip" title="Required field - This field is required, it cannot be blank, and must contain something that is different from emptyness in order to be filled in. ">Required</span>
</div>
<div class="field required">
<label for="email">Email</label>
<input type="text" class="text" name="email" id="email" title="Email"/>
<span class="required-icon tooltip" title="Required field - This field is required, it cannot be blank, and must contain something that is different from emptyness in order to be filled in. ">Required</span>
</div>
<div class="field required">
<label for="statusID">Status</label>
<select class="dropdown" name="statusID" id="statusID" title="Status">
<option value="0">- Select -</option>
<?php
$query = 'SELECT ID, statusName FROM statuses';
$result = mysqli_query ( $dbc, $query ); // Run The Query
while ( $row = mysqli_fetch_array ( $result, MYSQL_ASSOC ) ) {
print "<option value=\"".$row['ID']."\">".$row['statusName']."</option>\r";
}
?>
</select>
<span class="required-icon tooltip" title="Required field - This field is required, it cannot be blank, and must contain something that is different from emptyness in order to be filled in. ">Required</span>
</div>
<div class="field required">
<label for="isAdmin">Administrator</label>
<select class="dropdown" name="isAdmin" id="isAdmin" title="Administrator">
<option value="0">- Select -</option>
<?php
$administrator = array('Yes', 'No');
foreach($administrator as $admin):
?>
<option value="<?php echo $admin; ?>"><?php echo $admin; ?></option>
<?php endforeach; ?>
</select>
<span class="required-icon tooltip" title="Required field - This field is required, it cannot be blank, and must contain something that is different from emptyness in order to be filled in. ">Required</span>
</div>
</fieldset>
<fieldset>
<legend>Handler's Characters</legend>
<div class="field">
<label for="charactersDrop">Characters</label>
<select class="dropdown" name="charactersDrop" id="charactersDrop" title="Characters Dropdown">
<option value="0">- Select -</option>
<?php
$query = 'SELECT ID, characterName FROM characters WHERE ID NOT IN (SELECT characterID FROM handlerCharacters) ORDER BY `characterName`';
$result = mysqli_query ( $dbc, $query ); // Run The Query
while ( $row = mysqli_fetch_array ( $result, MYSQL_ASSOC ) ) {
print "<option value=\"".$row['ID']."\">".$row['characterName']."</option>\r";
}
?>
</select>
<input type="button" value="Add Character" class="" onclick="HandlerCharacters()"/>
<ul id="characterList"></ul>
</div>
<input type="hidden" name="userID" id="userID" value="<?php echo $userID; ?>" />
<input type="submit" class="submit" name="submitHandler" id="submitHandler" title="Submit Handler" value="Submit Handler" />
</fieldset>
</form>
<!-- /Form -->
<!-- Messages -->
<div class="message message-error">
<h6>Required field missing</h6>
<p>Please fill in all required fields. </p>
</div>
<div class="message message-success">
<h6>Operation succesful</h6>
<p>Handler was added to the database.</p>
</div>
<!-- /Messages -->
<script type="text/javascript" language="javascript">
// Long version
function HandlerCharacters() {
function isDupe(which) {
var result = false;
$('ul#characterList li').each(function(i, e) {
if ($(e).data('characterID') == which) {
result = true;
return false; // break out of .each()
}
});
return result;
}
var characterID = $('#charactersDrop option:selected').val();
var characterName = $('#charactersDrop option:selected').text();
if (characterID > 0 && !isDupe(characterID)) {
// Create the anchor element
var anchor = $( '<a href="#">Remove</a>' );
// Create a click handler for the anchor element
anchor.click( function() {
$( this ).parent().remove();
return false; // makes the href in the anchor tag ignored
} );
// Create the <li> element with its text, and then append the anchor inside it.
var li = $( '<li>' + characterName + ' </li>' ).append( anchor );
li.data( 'characterID', characterID );
// Append the new <li> element to the <ul> element
$( '#characterList' ).append( li );
}
}
</script>
Hi, This is my first post while learning Javascript and jQuery as total noob. I have something like this: Code: var desc = "This is your title and here is even more that might be added so that we can get at least 60 characters or so";
var desc = desc.trim().substring(0, 40).split(" ").slice(0, -1).join(" ") + "...more";
alert(shortText );
It is actually being used on a page that calls a description from a MySQL table, but this example fails in exactly the same manner. Although FF and other browsers successfully initiate the script with errors, but IE loops endlessly and freezes up. FireBug reports "reference to undefined property a[d]". Using jQuery 1.6.2. I'm not really sure what property is undefined here and how this can work without freezing IE. Thanks in advance for any help! AJ I have a page: http://www.girlscoutsmoheartland.org...progsearch.php that works perfectly fine in every browser I try, except for actual IE7 (it even works fine in IE8 emulating IE7). When you search for something on that page and have a display of results, each result has a link that changes a table row's display to visible, and hides the row when clicked again. It doesn't do that in IE7. There are no errors or warning in Firefox's Error Console. But IE7 has an "Error on Page" notice (which does NOT appear in IE8 emulating IE7), that says: Line: 59 Char: 11 Error: Could not get the display property. Invalid argument. The script in question is this, with what would be line 59 indicated: Code: <script type="text/javascript">
<!--
function toggle_visibility(id) {
var e = document.getElementById(id);
var f = document.getElementById(id + "b");
if(e.style.display == 'table-row')
e.style.display = 'none';
else
e.style.display = 'table-row'; <<-- This is line 59
if(f.style.display == 'table-row')
f.style.display = 'none';
else
f.style.display = 'table-row';
}
//-->
</script>
I really don't know what to do, or where to begin. Everything in my limited knowledge seems to be working just fine. Most of my site's visitors use IE8, but enough use actual IE7 that I really need to fix this. Thanks for any help or advice! Liam I am sorry the following code is a bit of a mouthful, but I can't find a better way to display the problem. The code works as expected in Chrome, but not in IE and FF. In IE the error is "Object doesn't support this action" and in FF "setting a property that has only a getter". In Chrome there is no error in the console. There are three javascript <script>...</script>s that exist to display a <td> row in a table with a particular graphic depending on the screen width. The odd thing is that in both IE and FF (and of course Chrome), the first two scripts display perfectly well. Why does the third <script> produce an error? It has exactly the same form as the two before it. I can only guess it has something to do with where it occurs Googling the FF error, it has something to do with trying to set a read-only property, but then why do the first two <scripts> work? They are no different (at least I can't see a difference.) Code: <table border="0" width="100%" cellpadding="0" style="border-collapse: collapse" id="table3768">
<script>
if (screen.width > 1280) {
document.write("<td valign=\"top\" background=\"..\/..\/img\/lesson2.gif\" width=\"840\" height=\"301\">");
}
else {
document.write("<td valign=\"top\" background=\"..\/..\/img\/lesson.gif\" width=\"369\" height=\"301\">");
}
</script>
<p> </p>
<div align="left">
</table>
<table border="0" style="border-collapse: collapse" cellpadding="15">
<tr>
<td width="40"> </td>
<script>
if (screen.width > 1280) {
document.write("<td width=\"300\">");
}
else {
document.write("<td width=\"165\">");
}
</script>
<font face="Trebuchet MS" color="#808000">Today's lesson is about setting
goals...</font></td>
</tr>
</table>
</div>
</td>
<td rowspan="3">
<table border="0" cellspacing="0" style="border-collapse: collapse" cellpadding="0" id="table3920">
<tr>
<td><img border="0" src="../../img/teltopw.jpg" width="550" height="9"></td>
</tr>
<tr>
<td background="../../img/telbarw.jpg">
<p align="center">
<iframe name="ITV" src="lesson1TV.html" marginwidth="0" marginheight="0" scrolling="no" border="0" frameborder="0" width="480" height="376">
Your browser does not support inline frames or is currently configured
not to display inline frames.
</iframe></p>
</td>
</tr>
<tr>
<td><img border="0" src="../../img/telbotw.jpg" width="550" height="11"></td>
</tr>
</table>
</td>
<td align="center">
<a rel="nofollow" target="_blank" href="http://www.apple.com/quicktime/download/">
<img border="0" src="../../img/quicktimeani.gif" width="129" height="184"></a></td>
</tr>
<tr>
<script>
if ((screen.width = 1440) || (screen.width = 1400)) {
document.writeln("<td valign=\"top\" width=\"100%\" background=\"\/images\/101online\/listening\/lesson16\/notebot2.gif\" width=\"450\" height=\"50\">");
}
else if (screen.width <= 1280) {
document.writeln("<td valign=\"top\" width=\"100%\" background=\"\/images\/101online\/listening\/lesson16\/notebot.gif\" width=\"294\" height=\"50\">");;
}
</script>
</td>
<td valign="bottom"> </td>
</tr>
<tr>
<td valign="bottom" width="100%">
<div align="right">
<table border="0" cellpadding="5" style="border-collapse: collapse" id="table3926">
<tr>
<td align="center">
<a onmousedown="soundManager.play('piano','../../media/mp3/piano.mp3'); return true;" href="javascript: goFull('FULLSCREEN/lesson1full.html','info','width=1020,height=760,left=0,top=0,toolbar=no,scrollbars=no,status=no,directories=no,menubar=no,location=no,resizable=no');">
<img src="../../img/poster1ani.gif" border="0" width="95" height="29"></a>
<b><font size="1" face="Arial" color="#000080"> ON DISK</font></b></td>
<td align="center"><b><font size="1" face="Arial" color="#000080">OR
</font></b> <a onmousedown="soundManager.play('piano','../../media/mp3/piano.mp3'); return true;" href="javascript: goFull('CDRIVE/lesson1Cfull.html','info','width=1020,height=760,left=0,top=0,toolbar=no,scrollbars=no,status=no,directories=no,menubar=no,location=no,resizable=no');"><img src="../../img/poster7.bmp" border="0" width="53" height="30"></a>
<b><font size="1" face="Arial" color="#000080"> DRIVE</font></b></td>
</tr>
</table>
</div>
</td>
<td valign="bottom">
<iframe name="sounds" src="../../pagesounds.html" width="160" height="66" marginwidth="1" marginheight="1" scrolling="no" border="0" frameborder="0">
Your browser does not support inline frames or is currently configured not to display
inline frames.
</iframe></td>
</tr>
</table>
Any light on this would be most welcome! When I click on the image I want to get the "margin-left" value of its block. In the code below the margin-left is set at 100px. But when I click on the image the "margin-left" value shows in the "alert" as undefined. What code changes do I need to get the correct margin-left value? (Please, no guessing!) [CODE] <script type="text/javascript" > window.onload = function(){ document.getElementById("holder").onclick = showit; } function showit( ) { var marval = document.getElementById("holder").style.marginLeft; alert(" margin-left= " + marval + " typeof= " + typeof marval); } </script> <style type="text/css"> #holder{ padding: 0px; margin-left: 100px; } </style> </head> <body> <img id="holder" src="anyimage.gif" width="300px" height="200px" /> </body> [CODE] I've got this JavaScript code that is doing stuff to the content of <TR> rows.. but it's overselecting and I need to filter the <TR>s it selects in the bold line. var theRows = document.getElementsByTagName("TR"); var r = 0; var strTitle = ""; while (r < theRows.length) { try { strTitle = theRows[r].innerText || theRows[r].textContent; strTitle = strTitle.replace(/\n|\r|\t|\^ /g,""); if (strTitle.substring(0,1) == "(") { if (strTitle.indexOf("STAT") == -1) { theRows[r].style.display = "none"; ... continues Below is the rendered html. What I really want to do instead of if (strTitle.substring(0,1) == "(") Is only perform the operation when a row that is using class="ms- formlabel, or maybe has a FieldInternalName. I understand that strTitle is just pulling content, so how do I condition on other properties or strings within the <TR> row given my currently logic? Rendered HTML. <TR> <TD nowrap="true" valign="top" width="190px" class="ms-formlabel"><H3 class="ms-standardheader"> <nobr>1. Do you become short of breath or develop chest pain when climbing a flight of stairs?</nobr> </H3></TD> <TD valign="top" class="ms-formbody" width="400px"> <!-- FieldName="1. Do you become short of breath or develop chest pain when climbing a flight of stairs?" FieldInternalName="ShortofBreath" FieldType="SPFieldBoolean" --> <span dir="none"> Thanks for any help or information! I'm using ccs3PIE with my site. What I want to do is check if a DOM element has a css property like border-radius and then add a class to it. The problem I'm having is that I don't know how to check for the css property. I've been searching for it for a couple of hours now and I can't find anything that seems to work. Any ideas? |
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