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JavaScript - Getelementsbytagname Is Not A Function
today looking through my logs (errors) and one that came up was
Code: element.getElementsByTagName is not a function from the source Code:
getByAttribute = function(element, strTagName, strAttributeName, strAttributeValue)
{
var arrElements = (strTagName == "*" && element.all)? element.all : element.getElementsByTagName(strTagName);
Can anyone help me out here? thanks Similar TutorialsHello CodingForums. I have a script to increase the fontsize on my website.. It works perfectly, but currently it's only targetting my <p> tag and I want it to target my h2 and h3 aswell.. How can I do this? Code: var min=8;
var max=18;
function increaseFontSize() {
var p = document.getElementsByTagName('p');
for(i=0;i<p.length;i++) {
if(p[i].style.fontSize) {
var s = parseInt(p[i].style.fontSize.replace("px",""));
} else {
var s = 12;
}
if(s!=max) {
s += 1;
}
p[i].style.fontSize = s+"px"
}
}
function decreaseFontSize() {
var p = document.getElementsByTagName('p');
for(i=0;i<p.length;i++) {
if(p[i].style.fontSize) {
var s = parseInt(p[i].style.fontSize.replace("px",""));
} else {
var s = 12;
}
if(s!=min) {
s -= 1;
}
p[i].style.fontSize = s+"px"
}
}
Hello, I am just starting out learning JavaScript and I have just reach the DOM section of my course. I have a page with 10 <a> tags on it and I have created the following JavaScript to tell me how many I have. Code: <script type="text/javascript">
var myLinks = document.getElementsByTagName("a");
console.log("We have ", myLinks.length ," many links on the page");
</script>
However in the console it reports this: We have 0 many links on the page This is not true as there are 10 links, 9 in the navgation section of the website and 1 in the footer. If someone can tell me what I am doing wrong that would be great. Thanks This is a question about a code for a javascript slide show which i think is very important to understand because slide shows are heavily used! This is the html: Quote: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script language="javascript" script type="text/javascript" src="slideshow.js"></script> <title>Slideshow exercise</title> </head> <body> <h1> Slideshow exercicse</h1> <img class="slide" src="cityscape.jpg" width="400" height="300"> <img class="slide" src="Creative_design_sailing_leaves_under_blue_sky.jpg" width="400" height="300"> <img class="slide" src="Curiousity.jpg" width="400" height="300"> <img class="slide" src="raindrops-blue-garden-seamless-tile.jpg" width="400" height="300"> <p> Clic on image to view next slide</p> <p> Clic on image to view next slide</p> </body> </html> This is the .js file and my questions: Quote: var numslides=0;currentslide=0; var slides= new Array(); function MakeSlideShow(){ //find all images with the class "slide" imgs= document.getElementsByTagName("img");---------> question 1 for (i=0; i<imgs.length ; i++) { if(imgs[i].className != "slide") continue; slides[numslides]=imgs[i];----------------------------------->question2 //hide all but first image if(numslides==0) {imgs[i].style.display="block";} else{imgs[i].style.display="none";} imgs[i].onclick=NextSlide; numslides++;}//end of loop--------------------------->question3 } //end MakeSlideShow() function NextSlide(){ slides[currentslide].style.display="none";------------------>question4 currentslide++ if(currentslide >= numslides) currentslide=0; slides[currentslide].style.display="block";--------------->question5 } window.onload= MakeSlideShow; question1: does "imgs" automatically become an array here? If so, how can i print out its lenght? This is what i tried and it doesn't work-> var lengthimgs= imgs.length document.write(lengthimgs) question2: What is happening here? Is the imgs[i] array transferring its data into the slides[numslides] array? question3: If slides[numslides] and imgs[i] are interchangeable why can't this line be i++ instead of numslides++ question4: What is happenning to the slides array here? Is currentslide becoming a copy of numslides? question5: What does this do? Where does this line sent the code? Why this? Why hasn't "imgs[i].style.display="block";" already done the job for the display? Thanks i have this part of code in JS: Code: var receiveReq = getXmlHttpRequestObject();
function getXmlHttpRequestObject()
{
if (window.XMLHttpRequest)
{
return new XMLHttpRequest();
}
}
function getChatText()
{
if (receiveReq.readyState == 4 || receiveReq.readyState == 0)
{
receiveReq.open("GET","getChat_xml.php?chat=1&last=7", true);
receiveReq.onreadystatechange = handleReceiveChat;
receiveReq.send();
}
}
function handleReceiveChat()
{
if (receiveReq.readyState == 4)
{
var chat_div = document.getElementById('div_chat');
var xmldoc = receiveReq.responseXML;
var message_nodes = xmldoc.getElementsByTagName("message");
}
}
then in my getChat_xml.php i have: Code: $xml = '<?//xml version="1.0" ?><root>';
$last = 7;
$sql = "SELECT message_id, user_name, message, date_format(post_time, '%h:%i') as post_time" .
" FROM message WHERE chat_id = " . db_input($_GET['chat']) . " AND message_id = " . $last;
$message_query = db_query($sql);
while($message_array = db_fetch_array($message_query))
{
$xml .= '<message id="' . $message_array['message_id'] . '">';
$xml .= '<user>' . htmlspecialchars($message_array['user_name']) . '</user>';
$xml .= '<text>' . htmlspecialchars($message_array['message']) . '</text>';
$xml .= '<time>' . $message_array['post_time'] . '</time>';
$xml .= '</message>';
}
$xml .= '</root>';
echo $xml;
i get a "cannot cal a method getElementsByTagName of null" ??? i have no idea whats going on, help please? thanks (just started JS 2 weeks ago) -- this is also my first time posting here, if my post isnt following the proper template let me know and Ill fix it .. Thanks so much for taking the time to check this out in advance Im trying to make the first ul tag in the each slideMenus[] array index values have a position of left = 0px I keep recieving this error however ____________________________________________________ Error: slideMenus[i].getElementsByTagName("ul").style is undefined Line: 63 ------------------------------------------------------------------ the script in question is in [code]. Could someone tell me if I am just making a syntax error if not ill try redoing the whole thing. window.onload = makeMenus var currentSlide = null var timeID = null leftPos = 0 function makeMenus(){ var slideMenus = new Array() var allElems = document.getElementsByTagName("*") var slideListArr = new Array() for(var i=0 ; i < allElems.length ; i++){ if(allElems[i].className = "slideMenu") slideMenus.push(allElems[i]) } for(var i=0 ; i < slideMenus.length ; i++){ slideMenus[i].onclick = showSlide; Code: slideMenus[i].getElementsByTagName("ul")[0].style.left = "0px";
} document.getElementById("head").onClick = closeSlide document.getElementById("main").onClick = closeSlide } function showSlide(){ var slideList = this.getElementsByTagName("ul")[0] // mess with this if((currentSlide != null) && (currentSlide.id == slideList.id)) {closeSlide()} else{ closeSlide(); var currentSlide = slideList; currentSlide.style.display = "block"; timeID = setInterval('moveSlide()', 1); } } function closeSlide(){ if(currentSlide){ clearInterval(timeID); currentSlide.style.left = "0px" currentSlide.style.display = "none"; var currentSlide = null } } function moveSlide(){ var leftPos = leftPos + 5; if(leftPos <= 220) {currentSlide.style.left = leftPos + "px"} else{ clearInterval(timeID); var leftPos = 0} } Can someone please tell why this is not working in the browser. Here's my code: <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Untitled Document</title> <script type="text/javascript"> var secondaryHeadings = document.getElementsByTagName("h2") alert(secondaryHeadings[0].innerHTML); </script> </head> <body> <div> <h1> Main Headline </h1> <h2> Sub-Headline</h2> </div> </body> </html> Hi, I am facing a problem in passing replace() function as an argument in user defined java function, can any one help me how to resolve it? intention is to pass a file path to my user defined function, but before passing the path i want to replace the character '\' to '\\' I am posting my javascript function he <a href="#" onclick="OpenDocPreview('<%# Eval("PATH")%>'.replace(/\\/g,"\\\\"), '<%# Eval("Filename")%>')"><%# Eval("DocTitle") %></a> function OpenDocPreview(url, docname) { alert('message from search base : ' + url + ' ' + docname); } thank you, I was working on a tutorial for some ajax uploading stuff and I ran across a new function syntax I don't recognize. I am not a Javascript pro, but I am not a newbie either. here is the code I am working on: Code: function handleFileSelect(e){
var files = e.target.files;
var output = [];
for(var i=0,f;f=files[i];i++){
if(f.type.match('image.*')){
var reader = new FileReader();
reader.onload = (function(theFile){
return function(e){
var span = document.createElement('span');
span.innerHTML = ['<img class="thumb" src="',e.target.result,'" title="',theFile.nbame,'" />'].join('');
document.getElementById('list').insertBefore(span,null);
};
})(f);
reader.readAsDataURL(f);
}
}
document.getElementById('list').innerHTML = '<ul>'+output.join('')+'</ul>';
}
document.getElementById('files').addEventListener('change',handleFileSelect,false);
To be a little more clear, the code in question is that is the very middle. The syntax I don't understand is: Code: class.event = (function(arguments){
//stuff you put in a function...
})(more Arguments?);
I tried to customize a simple one to learn for myself and I wrote this: Code: var a = 'A';
var b = 'B';
test = (function(t){
alert(t);
alert(b);
})(b);
test(a);
The browser would alert 'B' and that's it. The console would tell me that 'test is not a function.' OK, so I am confused. The topmost code works. What I am wondering is what the syntax is called for creating a function (or event listener?) that way, and how it works. Although if I new what it was called I could just google how it works. Hi All, I'm trying to convert an anonymous function to a real function (nesting is getting out of hand), however the msg object becomes undefined after conversion. Here is the converted anonymous function which fails: https://gist.github.com/2587613 and here is the original anonymous function which works: https://gist.github.com/2587667 Any help would be greatly appriciated Hi! I'm trying to toggle a class and one works and the other does not and I don't know why. I'm just getting my feet wet with jquery and javascript and I figured this was a pretty easy task to take on! Maybe. Link to the page: Franklin Township Soccer Club - Change Field Status My sad, sorry attempt =| Code: $( "li.open" ).click(function() {
$( this ).toggleClass( "closed" );
});
$( "li.closed" ).click(function() {
$( this ).toggleClass( "open" );
});
The first function works with open, so I figured I'd just use opposite on closed! Ha! I don't think so! In the end within those function there is an element in a form on that page it's hidden. I'd like to change the value from a 0 to 1 for vice versa. That' will be my next step. If you could give me a little nudge in the right direction I'd appreciate it! But first understanding why one works and the other does not, that is the primary mission! I do appreciate any help given! Dave I found this script, and it works great: Code: <script type="text/javascript">
function disable(element)
{
var input = document.getElementById(element).getElementsByTagName("input");
for(var i = 0; i < input.length; i++)
{
input[i].setAttribute("disabled","true");
}
}
</script>
I tried to make the inverse by simply reversing the setAttribute() like so: Code: <script type="text/javascript">
function enable(element)
{
var input = document.getElementById(element).getElementsByTagName("input");
for(var i = 0; i < input.length; i++)
{
input[i].setAttribute("disabled","false");
}
}
</script>
But that didn't do it. Can someone show me why, and how to fix it? Here's the sample form which I'm trying to test it on: Code: <form>
<input type="radio" name="test" onclick="disable('D1')" /> disable<br/>
<input type="radio" name="test" onclick="enable('D1')" /> enable<br/>
<fieldset id="D1">
<input class="" type="text" value="test value1" /><input class="" type="text" value="test value2" /><br/>
<input class="" type="text" value="test value3" /><input class="" type="text" value="test value4" /><br/>
<input class="" type="text" value="test value5" /><input class="" type="text" value="test value6" /><br/>
</fieldset>
</form>
Edit: The ultimate goal which I'm working toward now (step by step =) is to have a form more like: Code: <form>
<input type="radio" name="test" onclick="disable('D1')" />
<fieldset id="D1">
<input class="" type="text" value="test value1" /><input class="" type="text" value="test value2" />
</fieldset>
<input type="radio" name="test" onclick="disable('D2')" />
<fieldset id="D2">
<input class="" type="text" value="test value3" /><input class="" type="text" value="test value4" />
</fieldset>
<input type="radio" name="test" onclick="disable('D3')" />
<fieldset id="D3">
<input class="" type="text" value="test value5" /><input class="" type="text" value="test value6" />
</fieldset>
</form>
And have the fieldsets enable and disable according the selection of the radio buttons. Also, the fieldsets (and their ID's) will be dynamically generated via PHP Thanks-a-bunch, ~ Mo i keep getting error Call to undefined function codeandurl() below is my code PHP Code: <?php $value= strip_tags(get_field('link',$post)); $resultid=get_field('resultid',$post); codeandurl($resultid,$value); ?> <div id="result"></div> <script type="text/javascript"> function codeandurl(resultid,url){ $( "#result" ).text(resultid); $( "#result" ).dialog({ modal: true, buttons: { Ok: function() { $( this ).dialog( "close" ); } } }); window.open(url); return false; } </script> <p> <script type="text/javascript">// <![CDATA[ var metrics = { "mm" : 1, "cm" : 10, "m" : 1000, "inch" : 25.4, "foot" : 304.8 }; function convert(num, dec){ var val = document.getElementById("fromVal").value; if(isNaN(val)){ return } function roundNumber(num, dec) { var result = Math.round( Math.round( num * Math.pow( 10, dec + 1 ) ) / Math.pow( 10, 1 ) ) / Math.pow(10,dec); return result; } document.getElementById("toVal").value = val * metrics[document.getElementById("fromSystem").value]/ metrics[document.getElementById("toSystem").value]; } var interval = null; function watchChanges(){ interval == null ? setInterval("convert()", 500) : clearInterval(interval); } // ]]></script> </p> <table> <tbody> <tr> <td><input id="fromVal" style="width: 100px;" onfocus="watchChanges()" onblur="watchChanges()" type="text" /><select id="fromSystem" onchange="convert()"> <option value="mm">millimeters</option> <option selected="selected" value="cm">centimeters</option> <option value="m">meters</option> <option value="foot">feet</option> <option value="inch">inches</option> </select></td> </tr> <tr> <td colspan="1" align="center">=</td> </tr> <tr> <td><input id="toVal" style="width: 100px;" type="text" disabled="disabled" /><select id="toSystem" onchange="convert()"> <option value="mm">millimeters</option> <option value="cm">centimeters</option> <option value="m">meters</option> <option selected="selected" value="foot">feet</option> <option value="inch">inches</option> </select></td> Thank you in advance if someone can help. I have been banging my head against the wall for hours now. Here is the code: Code: for (var i = 0; i < BS_crm['activityTypes'].length; i++) {
var clickFunc = function(){ activityList.showForm( -1, {blockType:[""+BS_crm['activityTypes'][i]['id'], "0"]} ); };
var type = {
value: BS_crm['activityTypes'][i]['id'],
label: "Add New "+BS_crm['activityTypes'][i]['label'],
css: BS_crm['activityTypes'][i]['css']+"_16",
onClick: clickFunc
};
previewLinks.items.push( type );
}
Now, basically what I am doing here is running through one array to create an array of objects, that will be used to create links that will use whatever onClick function I pass it. The problem is that on the second line I need the BS_crm['activityTypes'][i]['id'] to be a value, not a reference. If that line was simply changed to: Code: var clickFunc = function(){ activityList.showForm( -1, {blockType:["3", "0"]} ); };
then everything would work as I need. How can I make this happen? I would really appreciate any help. Thank you again in advance. I made a mouseover event of a caption on a picture, when I hover the opacity of the background color of the hover and the text goes down. What I want is that when I hover over the image which the caption is floating on, the onmouseover event gets activite. For an imaginary example: Code: function unhighlight(x) {
x.style.backgroundColor="transparent"
}
Function ActivationFuction()
{
activate.function="unhighlight"
}
thanks Code: <html>
<head>
<title>TESTING</title>
<script type="text/javascript">
<!--
document.write("<input type='submit' value='submit' onclick='func()'>");
function func()
{
document.write("<input type='submit' value='New Button' onclick='func()'>");
window.alert("THIS");
}
-->
</script>
</head>
<body>
<!--input type="button" value="Read" onclick="ReadFiles()"-->
</body>
</html>
This is a very basic version of what I am trying to do. I have a dynamic list which is set in a table. When clicked, a function is run to set up a new list.. The reason I explain that, is that I need to keep it dynamic. Now for the problem: When I run this page, I have the button made right away, then when clicked it creates the new button. The new button should also run the function to create the new button again, but when I click it, I only receive "error on page". I don't know if there is a better way to go about this, but as for this route, I am stuck. Any help is greatly appreciated! -Shane I'm trying to "progressively enhance" one of my surveys using javascript. Basically, I have rating scales that make use of radio buttons as each point on the scale. Each radio button occupies its own cell in a table. I wrote some functions that will highlight cells on mouseover in a color corresponding to its position on the scale (e.g. the lowest point is red, the midpoint is yellow, the highest point is green). When a radio button is clicked, the background of the button's cell and preceding cells in the same row will be colored accordingly. The functions are working well in FireFox and Chrome (I just have to add a few lines using the addEvent function to make it compatible with IE). The effect looks a lot nicer when I add a function that makes the visibility of the radio buttons hidden. However, I want to make sure that there is a fallback option in case the functions that color the cells don't work for whatever reason. I would not want the radio buttons hidden in this case. Is there a method whereby I can call the "hideRadiobuttons" function only if the other functions are successfully executed? How can I call a PHP Function inside a Javascript Function? This is what I have so far, but I don't think I'm doing it the right way. Any suggestions? PHP Code: <?php function phpQuery(){ $query = mysql_query("INSERT INTO mytable VALUES('','name','email')"); } ?> <script type="text/javascript"> function delayQueries() { timeoutID = window.setTimeout(doQueries, 2000); } function doQueries() { var runQuery = "<?php phpQuery(); ?>"; } </script> Hi, Any one help me In one variable i have some data ex: var data = document.getElementById("imageId").value; I want to pass this data to another function inside another function ex: var button1 = '<img src="images/Remove-button.gif" width="70" height="15" onclick="removeVerifyImageRow(this),saveLibData('+data+')"/>'; while running the application i am getting an error incase if the data is string ex:if data is 'image1' i am getting an error, but with number there is no problem ex: if data is '1122'. this is very urgent to solve this problem plz any one help me Hi, I am working on a google map where you can show lines on the map by checking checkboxes. Lines are displayed according to their category attribute in the xml file. The function that picks up the checkbox click is like this: Code: function boxclick(box,category) {
if (box.checked) {
show(category);
} else {
hide(category);
}
Another part of the code assigns that category attribute to arrows, so that when a line of "x" category is displayed, the relevant arrows are displayed along with it, to indicate directionality. I also have a select list which displays the lines by looping through their array and using selectedIndex in a function called handleSelected2. But I can't get the arrows to display along with the lines from the select box. After trying many, many things, I figure that all I need to do is to call the show(category) function from inside the handleSelected2 function and it should all come together. So I came up with this: Code: function handleSelected2(opt,category) {
for (var h = 0; h <gpolylines.length; h++) {
gpolylines[h].hide();
}
h = opt.selectedIndex - 1;
if (h > -1) {
gpolylines[h].show();
}
for (var v=0; v<pts.length; v++) {
show(category);
}
}
which gets me lines, but no arrows. You can see it sort of working he http://www.xelawho.com/map/zonesarrowstest.htm I figure I've got to be close, because if I just tell it to show all the arrows (without going through the category filter) like this: Code: function handleSelected2(opt,category) {
for (var h = 0; h <gpolylines.length; h++) {
gpolylines[h].hide();
}
var h = opt.selectedIndex - 1;
if (h > -1) {
gpolylines[h].show();
}
for (var i=0; i<pts.length; i++) {
pts[i].show();
}
}
then all the arrows show up, as you can see he http://www.xelawho.com/map/zonesarrowstest2.htm I'm not getting any error messages and I've tried pretty much everything I can think of... I've been tweaking this for days and it's driving me crazy. Does anybody else have any ideas? Thanks in advance. |
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