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JavaScript - Trouble With Ie And Array.prototype Function
Array.prototype.each = function (fn) {
this.map(fn) } This is my each function that works great in every other browser but IE. UGH! What am I doing wrong? the error points to the this in the function. Is it that IE doesn't like map? Has anyone seen this before? I thought my code was correct. Works perfect in FF, chrome and opera. the canvas text doesn't work in opera, but it does render the features so the each function is working. I'll post the code if needed, but it's huge. here's the script running. http://www.pdxbusiness.com/canvas/golf/ Similar TutorialsHi, all~..According to ECMAScript, the root of the prototype chain is Object.Prototype. Each object has an internal property [[Prototype]] that could be another object or NULL.... However, it also says that every function has the Function prototype object: Function.Prototype, it confused me, because a function is an object, for a function object, what is its function prototype and object prototype..For example: Code: var x = function (n) {return n+1;};
what is the relationships of x, Object.Prototype and Function.Prototype
Thx a lot !!!!!!!!! Hey All - I asked this a few days ago.. what I came up with works just fine, but I feel it doesn't take advantage of "classes". If you think I could make this better by turning it into a class or using some other notation, that would be great. Keep in mind, ALL this does is rewrite a pagination.... for a search return in a lightbox. I have this function called in the return function... Code:
var srcpagParams = $H();
function buildPagi(param, currdsplyNum){
var temDsply = new Template('<strong>[#{total_display}<span id="count">#{prevImg} #{links} #{nextImg}</span>'),
crnt_link = srcpagParams.set('crnt_link', param), // the page we want to see
dsplyNum = srcpagParams.get('paginateNum'), // what is the number of returns per page
ttl_lnks = Math.ceil( srcpagParams.get('numFound') / srcpagParams.get('paginateNum')), // total pages
data_template = new Hash();
data_template.set('total_display',srcpagParams.get('numFound'));
bldImg = function() {
var prvB = '<a href="#content" id="pagiPrev" onclick="firesrc(this)">Prev<img src="blank.gif" /></a>';
var nxtB = '<a href="#content" id="pagiNext" onclick="firesrc(this)">Next<img src="blank.gif" /></a>';
data_template.set('prvImg',(crnt_link > 1) ? prvB : "");
data_template.set('nxtImg',(crnt_link < ttl_lnks) ? nxtB : "");
}
bldLk = function(){
var holder = "";
if(ttl_lnks > 1){
var linkStr = new Template(' <a href="#content" onclick="firesrc(#{pos});"> Go to page #{pos}</a> ');
$R(1,ttl_lnks).each(function(n) {
var posit = {pos : n}
holder += (crnt_link == n) ? " " + n + " " : linkStr.evaluate(posit);
});
data_template.set('links',linkholder);
}
}
bldRng = function(){
var currPaneRg = (dsplyNum * crnt_link) - (dsplyNum - currdsplyNum);
data_template.set('range',((crnt_link - 1) * (dsplyNum) + 1 ) + " - " + currPaneRg);
$('pages').update(temDsply.evaluate(data_template)).show();
}
firesrc = function(cl){
var pagiPane = (typeof cl === "number") ? cl : (cl.id == "pagiNext") ? crnt_link + 1 : crnt_link - 1;
var start = crnt_link * srcpagParams.get('paginateNum');
Alertsrc( $F('query') ,(pagiPane)) // pass the query to the json to return the current search request
}
bldImg();
buildLnk();
bldRng();
};
Since some of the data declared at the top changes depending on the return, I didn't know if I could "initialize" it in a class.
But could I turn this into a class and if so - what I just use:
var buildPagi = create.Class({
initialize: object.extend({
})
})
Call the function when we are passed some data: Code: buildPagi(somevalue, somevalue2) ** NOTE: I use the libraries prototype and jquery.. so use Create.Class and new Template are within the libraries... etc.. so, is there a more eloquent, or robust way to write what I did above? The code below looks elementary, but it gives absurd results. Can you tell how I should have written it? I am slowly beginning to understand why it fails. But I do not understand why the JavaScript tutorials I've studied never warned against this trap. Any ship needs a list of crew members. The total number of persons onboard must be known too, for the case the ship sinks. We place these two properties in a prototype, so that we won't have to repeat them for each kind of ship. A passenger list is needed only if the ship is a passenger ship, so we decide not to place the passenger list in a prototype. Code:
function Ship() {
this.crew = [];
this.persons = 0;
}
function PassengerShip(name) {
this.name = name;
this.passengers = [];
}
PassengerShip.prototype = new Ship;
Passengers and crew arrive one by one shortly before departure. The first thing they do onboard is to check in: Code: Ship.prototype.checkin = function(list, person) {
this[list].push(person);
++this.persons;
}
(Instead of the push function, we could as well have used a statement such as Code: this[list][ this[list].length ] = person; I have tried. Same wrong result.) Let us launch two passenger ships and check some persons in. Code: var msFloat = new PassengerShip("M/S Float");
msFloat.checkin("crew", "Captain");
msFloat.checkin("crew", "Cook");
msFloat.checkin("passengers", "Alice");
msFloat.checkin("passengers", "Bob");
var msFlawed = new PassengerShip("M/S Flawed");
msFlawed.checkin("crew", "Capt'n");
msFlawed.checkin("crew", "Sailor");
msFlawed.checkin("passengers", "Charlie");
The shipping company wants a report when everybody has checked in. But I'm not sure they will like it: Code: Ship.prototype.report = function() {
function makeList(ship, list) {
if (!ship[list]) return (ship.name + " has no list of " + list + ".\n");
if (!ship[list].length) return (ship.name + " has no " + list + ".\n");
return (list + ": " + ship[list].join(", ") + "\n");
}
alert("\nPre-Departure Report For '" + this.name + "'\n\n" +
makeList(this, "passengers") + makeList(this, "crew") +
"\nNumber of persons onboard: " + this.persons + "\n\n");
}
msFloat.report(); // OK: Alice, Bob as passengers; Captain, Cook as crew
msFlawed.report(); // WRONG CREW: Captain, Cook, Capt'n, Sailor
The number of persons (passengers + crew) is reported correctly for both ships, and so is the passenger list. But the "M/S Flawed" reports four crew members. Two of those never checked in on that ship. How can such a thing happen? What kind of blunder did I make? An "edit+execute" version of the code is available at bjarne.altervista.org/sailor.html together with a little testoutput, some considerations based on that testoutput, and a workaround (which is not the same as a solution - it looks ridiculous). It seems as if arrays placed in prototypes do not always work as expected. Can that be true? The testoutput suggests that JavaScript sometimes forgets to create a much-needed own property in the this object, and instead changes the prototype. But that sounds incredible, doesn't it? I am not too familiar with the deeper theory of JavaScript, and I hope to get a response. Here is the code concatenated and embedded: Code: <?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head><title>Array In JavaScript Prototype</title></head>
<body>
<script type="text/javascript" language="JavaScript">
function Ship() {
this.crew = [];
this.persons = 0;
}
function PassengerShip(name) {
this.name = name;
this.passengers = [];
}
PassengerShip.prototype = new Ship;
Ship.prototype.checkin = function(list, person) {
this[list].push(person);
++this.persons;
}
Ship.prototype.report = function() {
function makeList(ship, list) {
if (!ship[list]) return (ship.name + " has no list of " + list + ".\n");
if (!ship[list].length) return (ship.name + " has no " + list + ".\n");
return (list + ": " + ship[list].join(", ") + "\n");
}
alert("\nPre-Departure Report For '" + this.name + "'\n\n" +
makeList(this, "passengers") + makeList(this, "crew") +
"\nNumber of persons onboard: " + this.persons + "\n\n");
}
var msFloat = new PassengerShip( "M/S Float" );
msFloat.checkin("crew", "Captain");
msFloat.checkin("crew", "Cook");
msFloat.checkin("passengers", "Alice");
msFloat.checkin("passengers", "Bob");
msFloat.report(); // OK: Alice, Bob as passengers; Captain, Cook as crew
var msFlawed = new PassengerShip( "M/S Flawed" );
msFlawed.checkin("crew", "Capt'n");
msFlawed.checkin("crew", "Sailor");
msFlawed.checkin("passengers", "Charlie");
msFlawed.report(); // WRONG CREW: Captain, Cook, Capt'n, Sailor
</script>
</body>
</html>
I have spent much time struggling with this kind of error, which is reproducible in 5 different browsers. This is the first time I have been able to reproduce it in a form that can be presented to others. Is there a well-established programming practice that can prevent it? What do experienced JavaScript programmers do? Regards Bjarne Pagh Byrnak Hi all, Basically I'm having trouble writing a date function to return this data: [CODE] // Get Date d=new Date(); a=d.getUTCFullYear(); b=d.getUTCMonth() + 1; c=d.getUTCDate(); e=d.getUTCHours() - 1; f=d.getUTCMinutes(); [CODE] I need it so I can run setinterval on the date function. I'm quite new to javascript (obviously!) so any help will be much appreciated. Thanks Hi I'm having trouble with the pickString function bellow the getRandomNumber function. When working it should be invoked using the variable "termString" (bellow) as the argument. I hope someone can help as i can't move on without this section working. Thanks <SCRIPT language="JavaScript"> //TO DO: PASTE THE getRandomNumber() FUNCTION YOU WROTE FOR TASK 1 HERE function getRandomNumber(aNumber) { var rand = Math.floor(Math.random() * aNumber + 1); return (rand); } //Task 2 (iii)(a) /* Picks a random substring from a string separated by delimiter characters. The function takes two string arguments: a String separated into substrings by a delimiter aDelimiter, a string of one character returns a string */ function pickString(aString, aDelimiter) { var aString = new Array(); var stringArray = aString.split(); var stringArray = getRandomNumber(stringArray.length); return stringArray; } var termString = 'hard disk*Term 1#magnetic tape*Term 2#flash drive*Term 3#optical disc*Term 4#ram*Term 5'; //WRITE CODE TO INVOKE THE pickString() FUNCTION HERE //WRITE CODE TO SPLIT THE STRING RETURNED BY pickString() INTO AN ARRAY HERE //WRITE CODE TO DISPLAY THE TERM RETURNED BY pickTerm() AND ITS ASSOCIATED NUMBER HERE </SCRIPT> </HEAD> <BODY> <STRONG>A test of the random number functions <BR></STRONG> <FORM NAME = "randomForm"> <INPUT TYPE = "button" NAME = "randomButton" VALUE ="Display Random Number" ONCLICK = "window.alert(termString);"> </FORM> </BODY> </HTML> Hi i start of with a some csv data and convert this into an array. The resulting array looks like the following [["Apple", "64"], ["Banana", "20"], ["pear", "12"], ["Orange", "16"]] But i need this to be formatted as below without the quotes around the second value. [["Apple", 64], ["Banana", 20], ["pear", 12], ["Orange", 16]] Im not sure how to achieve this. I guess i need to loop through the array and strip out the quotes but im failing to get this working. Help! I am taking an online class and the instructor is no help whatsoever. Please see where I'm going wrong with this. I'm sure it is something small I'm missing. Thanks. The assignment is: Create a function named emLink() that writes an email address using text strings of the username and server names entered in reverse order as parameter values. The command to call the function would look as follows: emLink("eman","revres"). Call the stringReverse() function with name as the parameter value to reverse the order of characters. Code:
<html>
<head>
<script type="text/javascript">
function emLink(name,server) {
var rname="eman";
var rserver="revres";
stringReverse(rname);
stringReverse(rserver);
var email="eman@revres";
var mailText='<a href="mailto:eman@revres">"eman@revres"</a>';
document.write(mailText);
}
function stringReverse(textString) {
if (!textString) return '';
var revString='';
for (i = textString.length-1; i>=0; i--)
revString+=textString.charAt(i)
return revString;
}
</script>
</head>
<body>
<script type="text/javascript">
var rname="reldac";
var rserver="ude.ortsa.uwm";
emLink(rname,rserver);
</script>
</body>
</html>
Currently, all it returns it : "eman@revres" I am trying to sort an array of strings based on the location of a string called "this.oText.value" inside an array of strings called "aList." If "this.oText.value" comes earlier in an entry in aList (call it "a") than another entry "b", I want "a" to appear before "b". Clearly, there is something very wrong with my code. It really isn't doing anything as of right now. Code: aList.sort(sortArray);
function sortArray(a,b)
{
if(a.toLowerCase().indexOf(this.oText.value.toLowerCase()) < b.toLowerCase().indexOf(this.oText.value.toLowerCase()))
return 1;
else if(a.toLowerCase().indexOf(this.oText.value.toLowerCase()) > b.toLowerCase().indexOf(this.oText.value.toLowerCase()))
return -1;
else
return 0;
}
I'm just a beginner with JS and having trouble with the code for my array and FOR loop. I'd like the names of these animals to be listed on separate lines. Am I way off here? I wasn't sure if the for statement had to be within a function. I've spent hours trying to figure this out and appreciate any help. <script type="text/javascript"> var animal = new Array(4); animal[0] = "dog"; animal[1] = "cat"; animal[2] = "bird"; animal[3] = "rabbit"; var counter = 0; function writeAnimal () { for (var counter = 0; counter== 4; counter++) { document.write(animal[0]); document.write("<br />"); } } </script> All I am trying to pull the data from an array and place it in a table. If I assign index 0 it works as desired. I then placed it inside a foor loop and changed the index to a variable and I get "undefined". Here is the code snipet: document.write("<table width='500'>"); document.write("<tr><td width='75%'>Product:</td><td width='25%' align='center'>Cost</td></tr>"); for (i=0; i<(itemPrice.length); i++); { document.write("<tr><td>" + itemName[i] + "</td><td align='right'>" + itemPrice[i] + "</td></tr>"); totalcost = totalcost + itemPrice[i]; } document.write("<tr><td>The total is:</td><td align='right'>" +"$ "+totalcost+ "</td></tr>"); document.write("</table>"); compared to some of the samples I have seen I apologize if this is too elementary. rneaul I have an array, I can not figure out how to take myTemplateholder = myTemplateholder.replace(" "+children[child],children[child]+"<div id='questionRadio'><input type='radio' name='answer' value='Y' /> Y <input type='radio' name='answer' value='N' /> N <input type='radio' name='answer' value='NA' /> N/A<br /></div>");} to display to separate lines. Right now, if there is more than one value, it gets added together. Here's the rest of the code: Code: function showText(){
// var myTemplateholder = document.getElementById('myTemplateholder').innerHTML;
// document.getElementById('showMe').innerHTML = myTemplateholder;
var children = new Array('Chills','Fatigue','Fever','Health History','Screening','Eye-ROS','Skin','Assessment','General Appearance','Vitals','Hearing','200','300','400','500');
var myTemplateholder = $('#myTemplateholder').text();
myTemplateholder = myTemplateholder.replace("Sections ","");
myTemplateholder = myTemplateholder.replace("History","<div id='templateHeader'>History</div>");
myTemplateholder = myTemplateholder.replace("ROS","<div id='templateHeader'>ROS</div><br>");
myTemplateholder = myTemplateholder.replace("Exam","<div id='templateHeader'>Exam</div>");
myTemplateholder = myTemplateholder.replace("ICD9","<div id='templateHeader'>ICD9</div>");
for(child in children) {
myTemplateholder = myTemplateholder.replace(" "+children[child],children[child]+"<div id='questionRadio'><input type='radio' name='answer' value='Y' /> Y <input type='radio' name='answer' value='N' /> N <input type='radio' name='answer' value='NA' /> N/A<br /></div>");
}
$('#showMe').html(myTemplateholder);
}
I'm totally stuck! Thanks for bearing with a newbie - any help would be greatly appreciated. I am trying to create a simple auto-calculate function for a webpage. What should be happening: The 'onchange' command should pass the 'price' of the item to the function, the function should then cycle through all the dropdowns (or checkboxes or fields) and calculate the total. What is happening: It is only picking up the last checkbox. It seems that the 'for' loop only remembers the last item in the array. What am I doing wrong? How can I get the code to remember all the items? thanks, Code: <script language="JavaScript" type="text/javascript">
function calculateTotal(price)
{
var total = 0;
var cList = ['sel1','sel2','sel3'];
for (i=0;i<2;i++);
var select = GetE(cList[i]); total+= price * (select.options[select.selectedIndex].value);
GetE("totalShow").innerHTML = total.toFixed(2);
}
function GetE(id) {return document.getElementById(id); }
</script>
<html>
<head></head><body>
<form id="form1" name="form1" method="post" action="">
<select name="sel1" id="sel1" onchange="calculateTotal(100)">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select><br><br>
<select name="sel2" id="sel2" onchange="calculateTotal(200)">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select><br><br>
<select name="sel3" id="sel3" onchange="calculateTotal(300)">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select><br><br>
</form>
<br>total <span id="totalShow">0.00</span>
</body></html>
Short version: I'm having trouble with "moving subarrays" in a multidimensional associative array. Long version: (Yes, I know that there's technically no such thing as a js associative array and that I'm actually using a generic object.) This is one of those annoying questions for which significant code can't be shown. I'm fetching a JSON object from PHP and parsing it as multi-dimensional associative array that comes out with this "structure": Code: obj[regions][variables][years] = value; My presentation logic works fine for that. Year data is presented for each variable, and variables are grouped by region. For reference, if needed, the display is tabular and similar to this: Code: Regions | Variables | 2003 | 2004 | 2005
=========================================
| measure1 | abcd | efgh | ijkl
=================================
county1 | measure2 | mnop | qrst | uvwx
=================================
| measure3 | yzab | cdef | ghij
=========================================
| measure1 | abcd | efgh | ijkl
=================================
county2 | measure2 | mnop | qrst | uvwx
=================================
| measure3 | yzab | cdef | ghij
=========================================
| measure1 | abcd | efgh | ijkl
=================================
county3 | measure2 | mnop | qrst | uvwx
=================================
| measure3 | yzab | cdef | ghij
=========================================
| measure1 | abcd | efgh | ijkl
=================================
county4 | measure2 | mnop | qrst | uvwx
=================================
| measure3 | yzab | cdef | ghij
=========================================
My problem comes from trying to allow the option to reorganize the grouping - that is, turning it into regions grouped by variable. The display logic can handle it, but I can't get the array handling code right. The desired secondary structure is Code: obj[variable][region][year] = value; Some things I've tried: Code: /* obj is in the format of obj[region][variable][year] = value */
data_arr = new Array();
for (var region in obj)
{
for (var variable in obj[region])
{
for (var year in obj[region][variable])
{
/* fail one */
data_arr[variable][region][year] = obj[region][variable][year];
/* data_arr[variable] is undefined */
/* fail two */
y = obj[region][variable][year];
y_arr = new Array();
y_arr[year] = y;
r_arr = new Array();
r_arr[region] = y_arr;
data_arr[variable] = r_arr;
/* only the values from the last iteration are displayed */
/* fail three */
y = obj[region][variable][year];
y_arr = new Array();
y_arr[year].push(y);
r_arr = new Array();
r_arr[region].push(y_arr);
data_arr[variable].push(r_arr);
/* y_arr[year] is undefined */
}
}
}
And then other permutations of those three. I could run through it easy if not needing the textual index, but that's actually part of my display data, so it has to stay. Can anyone help me with what I'm overlooking? hi, I'm trying to inherit with prototype but I'm not able to do so. The problem is that I have a few functions which use some common variables and common functions and I want to inherit a Resource object with all these parameters. I also whant this inheritance to be done when I load the function, so no extra functions are loaded unless I need them. Here's the code Code: function Resource(){
this.url='';
this.object=new Object();
this.id='';
this.categories=new Array();
}
function Users(){
Users.prototype=new Resource();
this.url='user/';
this.name='';
this.email='';
};
function test(){
var users = new Users();
alert(users.id);
};
When I run the test function for the first time I get an undefined. a second time works fine. I I get the prototype definition outside the User() function it also works fine, but I want the inherited function to be loaded when I need it. Any ideas? As always, thank you for your help. Anyone wanna give me some pointers on how prototypes work exactly? ;o Especially in the context of this code: Code: var chatscroll = new Object();
chatscroll.Pane = function(scrollContainerId){
this.bottomThreshold = 20;
this.scrollContainerId = scrollContainerId;
this._lastScrollPosition = 100000000;
}
chatscroll.Pane.prototype.activeScroll = function(){
var _ref = this;
var scrollDiv = document.getElementById(this.scrollContainerId);
var currentHeight = 0;
var _getElementHeight = function(){
var intHt = 0;
if(scrollDiv.style.pixelHeight)intHt = scrollDiv.style.pixelHeight;
else intHt = scrollDiv.offsetHeight;
return parseInt(intHt);
}
var _hasUserScrolled = function(){
if(_ref._lastScrollPosition == scrollDiv.scrollTop || _ref._lastScrollPosition == null){
return false;
}
return true;
}
var _scrollIfInZone = function(){
if( !_hasUserScrolled ||
(currentHeight - scrollDiv.scrollTop - _getElementHeight() <= _ref.bottomThreshold)){
scrollDiv.scrollTop = currentHeight;
_ref._isUserActive = false;
}
}
if (scrollDiv.scrollHeight > 0)currentHeight = scrollDiv.scrollHeight;
else if(scrollDiv.offsetHeight > 0)currentHeight = scrollDiv.offsetHeight;
_scrollIfInZone();
_ref = null;
scrollDiv = null;
}
It's code to make the scrollbars autoscroll down. Full article and extra info he http://radio.javaranch.com/pascarell...837038219.html I sort of understand it but I'm not clear on what prototypes are. im currently using a prototype add on for one of my sites and id like to convert it to mootools... problem is, i dont know the first thing about prototype! i stumbled upon this before i learned any javascript and ive gotten to know mootools and like using it... heres the code, let me know if anyone can help! Code: /**
* @author Bruno Bornsztein <bruno@missingmethod.com>
* @copyright 2007 Curbly LLC
* @package Glider
* @license MIT
* @url http://www.missingmethod.com/projects/glider/
* @version 0.0.3
* @dependencies prototype.js 1.5.1+, effects.js
*/
/* Thanks to Andrew Dupont for refactoring help and code cleanup - http://andrewdupont.net/ */
Glider = Class.create();
Object.extend(Object.extend(Glider.prototype, Abstract.prototype), {
initialize: function(wrapper, options){
this.scrolling = false;
this.wrapper = $(wrapper);
this.scroller = this.wrapper.down('div.scroller');
this.sections = this.wrapper.getElementsBySelector('div.section');
this.options = Object.extend({ duration: 1.0, frequency: 3 }, options || {});
this.sections.each( function(section, index) {
section._index = index;
});
this.events = {
click: this.click.bind(this)
};
this.addObservers();
if(this.options.initialSection) this.moveTo(this.options.initialSection, this.scroller, { duration:this.options.duration }); // initialSection should be the id of the section you want to show up on load
if(this.options.autoGlide) this.start();
},
addObservers: function() {
var controls = this.wrapper.getElementsBySelector('div.controls a');
controls.invoke('observe', 'click', this.events.click);
},
click: function(event) {
this.stop();
var element = Event.findElement(event, 'a');
if (this.scrolling) this.scrolling.cancel();
this.moveTo(element.href.split("#")[1], this.scroller, { duration:this.options.duration });
Event.stop(event);
},
moveTo: function(element, container, options){
this.current = $(element);
Position.prepare();
var containerOffset = Position.cumulativeOffset(container),
elementOffset = Position.cumulativeOffset($(element));
this.scrolling = new Effect.SmoothScroll(container,
{duration:options.duration, x:(elementOffset[0]-containerOffset[0]), y:(elementOffset[1]-containerOffset[1])});
return false;
},
next: function(){
if (this.current) {
var currentIndex = this.current._index;
var nextIndex = (this.sections.length - 1 == currentIndex) ? 0 : currentIndex + 1;
} else var nextIndex = 1;
this.moveTo(this.sections[nextIndex], this.scroller, {
duration: this.options.duration
});
},
previous: function(){
if (this.current) {
var currentIndex = this.current._index;
var prevIndex = (currentIndex == 0) ? this.sections.length - 1 :
currentIndex - 1;
} else var prevIndex = this.sections.length - 1;
this.moveTo(this.sections[prevIndex], this.scroller, {
duration: this.options.duration
});
},
stop: function()
{
clearTimeout(this.timer);
},
start: function()
{
this.periodicallyUpdate();
},
periodicallyUpdate: function()
{
if (this.timer != null) {
clearTimeout(this.timer);
this.next();
}
this.timer = setTimeout(this.periodicallyUpdate.bind(this), this.options.frequency*1000);
}
});
Effect.SmoothScroll = Class.create();
Object.extend(Object.extend(Effect.SmoothScroll.prototype, Effect.Base.prototype), {
initialize: function(element) {
this.element = $(element);
var options = Object.extend({
x: 0,
y: 0,
mode: 'absolute'
} , arguments[1] || {} );
this.start(options);
},
setup: function() {
if (this.options.continuous && !this.element._ext ) {
this.element.cleanWhitespace();
this.element._ext=true;
this.element.appendChild(this.element.firstChild);
}
this.originalLeft=this.element.scrollLeft;
this.originalTop=this.element.scrollTop;
if(this.options.mode == 'absolute') {
this.options.x -= this.originalLeft;
this.options.y -= this.originalTop;
}
},
update: function(position) {
this.element.scrollLeft = this.options.x * position + this.originalLeft;
this.element.scrollTop = this.options.y * position + this.originalTop;
}
});
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>";
}
G'day, How would I go about copying all the prototype functions AND the constructor from one object into another object, and then call them? Code: function myOriginal() {
alert('Hello');
}
myOriginal.prototype.example = function() {
alert('In example '+this.test);
}
function myNewThing() {
// Copy myOriginal into this object here
this.oldconstructor(); // Should now display "Hello"
this.test = 'from myNewThing';
this.example(); // Should now display "In example myNewThing"
}
I know I can use this.example.call(this), but that's not an acceptable solution. I want to deploy this style over dozens, potentially hundreds of objects. Thanks muchly, Your friend from server-side... Code: /**
* @class TestInheritance
*
* This is a class and it's constructor all in one but the constructor is not set yet
*/
function TestInheritance(){
this.testName;
return this;
}
/**
* @extends Util
* Make sure this is called after the constructor/class declaration
*/
TestInheritance.prototype = new Util();
/**
* @ctor TestInheritance
* Set it to itself if there isn't an explicit constructor
*/
TestInheritance.prototype.constructor = TestInheritance;
/**
* @extends Util
* This specifically is set to allow TestInheritance to access it's parent's identity
*/
TestInheritance.prototype.parent = new Util();
/**
* @extends Util
* @argument testName String
* All functions are called after setting the prototype
*/
TestInheritance.prototype.setTestName = function(testName){
this.testName = testName;
}
How would I reference the same Util class on both the prototype and the parent? Hi I am using a program called aptabs which uses the Protoype framework. The problem is that when I create a new tab and refresh the page, the newly created tab disappears. How can I resolve this ? NOTE: The zip file for aptabs is attached. Thanks |
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