Can't Get Event Listener To Work

Sep 4, 2010

I'm trying to use the addEventListener function to set an event listener but I don't understand why it won't work. Before i was using another method to handle events, but I needed more control over which event handlers get run and when.

Code:

<html>
<head>
<script type="text/javascript">
function runMe(){

[Code]....

I'm using Google Chrome, but it won't work in Firefox either. Obviously it won't work in IE, since IE doesn't support that method. The script gives no errors at all. The runMe() function does get executed, I tested this with alerts.

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Having Trouble With Event Listener: Detect Iframe Close Event Fromparent

Apr 3, 2007

I have an iframe that includes a button:
<input type="button" value="close this window" onclick="window.close();" >

I would like to detect the iframe close event from the parent window, I
was using this code but I did something wrong because the temp function
is fired every time the parent page loads:

function temp(){
alert('the iframe was closed');
}
function setup(){
var myIFrame = document.getElementById("iframe1");
if (myIFrame.addEventListener) {
myIFrame.addEventListener('onclose', temp(), false);
}else if (myIFrame.attachEvent) {
myIFrame.attachEvent ('onclose',temp);
}else{
myIFrame.onclose=temp();
}
}
window.onload=setup;

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I've got a really simple function I want to create, a confirm delete function that is applied to all links with a class of delete. A confirm message appears when the link is clicked, returning false if cancel is clicked.

This is my code and for whatever reason that I just don't get (coz I'm a bit confused by all this stuff), clicking cancel when the confirm message appears seems to return true regardless. Code:

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Aug 25, 2010

The html part:

Code HTML4Strict:
<div id='data'></div>
<form action="">
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[Code].....

This is the entry point for doing an autocomplete, but for know, I would just like to ask:

What should we do so that, the text that is typed, appears on that alert box?

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Oct 16, 2006

I want each instance of an object to be able to listen for input events.
When the event occurs, a method of the object should be called, such
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Is this possible? Example:

function MyConstructor(element)
{
//element is some HTML element
this.addListeners(element);

this.foo = "Bar";

return this;
}

MyConstructor.prototype.addListeners = function(element)
{
element.addEventListener("keypress", this.doSomething, true);
}

MyConstructor.prototype.doSomething = function(e)
{

alert(this.foo.length); //Error: this.foo has no properties

alert(this);
//shows the HTML element that triggered the event
}

Is there any way to get "this" to refer to the object in the event listener?

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Inline scripting makes this easy but I'm getting Typeof MissMatch error when I use Unobtrusive script and I think it's because of the diffrence between DOM and DHTML.

INLINE:

HTML Code:

Unobtrusive attach event listner/external js.

Code:

This writen in the js of the index.html containing the IFRAME 'display' runs once imediatley on load then imediatley after throws 'typeof mismatch' error.

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May 9, 2011

I have a form with many, many, many 'input type="text"' elements in it. I'd like to be able to dynamically add an 'onKeyDown' event listener. Here's what I've got, so far (I know it's wrong.)

Code:
function addEventToElement(formName,tagName,typeName,eventName,eventAction) {
thisForm = (typeof formName == 'string') ? document.getElementById(formName) : '' ;
thisTag = (typeof tagName == 'string') ? tagName : '' ;
thisType = (typeof typeName == 'string') ? typeName : '' ;
thisEvent = (typeof eventName == 'string') ? eventName : '' ;
thisAction = (typeof eventAction == 'string') ? eventAction : '' ;
if(thisForm != "") { // If elements are in a form, make sure ONLY those elements are affected
elem = new Array(); elem = thisForm.getElementsByTagName(thisTag); // array of all items of [tag]
alert(elem.length);
if(thisType != "") {
for(j=0;j<elem.length;j++) {
if(elem[j].type != thisType) { elem.splice(j,1); } // If a type is specified, remove tags that do not have a type attribute
}
}
}
else { // Otherwise, any/all elements in a document/body will be affected
elem = new Array(); elem = document.getElementsByTagName(thisTag); // array of all items of [tag]
if(thisType != "") {
for(j=0;j<elem.length;j++) {
if(elem[j].type != thisType) { elem.splice(j,1); } // If a type is specified, remove tags that do not have a type attribute
}
}
}
if((thisEvent != "") && (thisAction != "")) {
for(i=0;i<elem.length;i++) { // All elements are picked - let's apply some attributes
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}
}
}

HTML Code:
addEventToElement('form_name','input','text','keydown','return numbersOnly(event,this);');

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Jul 23, 2009

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Jun 28, 2010

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Although an element such as the example below would not activate these functions:
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I am trying to add a window event listener on some links in a loop instead of doing them one by one. I've tried

function setListeners (){
for (var i = 0; i < document.links.length; i++) {
src=document.links[i].href;
document.links[i].onmousemove=changeIframeSrc(src, 'solid',1, event);
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[Code]...

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Nov 21, 2011

I am testing some code that finds and element and attempts to add an event handler attribute to it as 'onclick' (test case in Firefox 3.5.9)

/*
The actual code is:
window.onload = function()
{
//<irrelevant code>
var test = document.getElementById('tstEl');

[Code]...

I am trying to do this because Element.addEventListener or Element.attachEvent won't allow for arguments to be passed to the event handler code/function. What is going on here? The only line referenced, line35, in the document text containing javascript code is irrelevant to the problem.

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I'm not new to JS, or the web and it's various other technologies, but I ran into a problem. I'm trying to add an event handler for a click on all HTML span tags. Trouble is, getElementByTags() doesn't work and neither does getElementByTagNames(). Strangely, adding an id to the span tags and getting their id's do trigger the handler.

Code:
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How would i add an avent listener to change the source of an image? I have added the image to a canvas element through javascript using the code below.

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Jul 30, 2010

I've got an Event Listener

$(".SFV").click(function(event) ...

And I've got an submit button

< ... type="submit" class="SFV">

When this button is displayed in a normal html-script, the event listener works. When I insert this button into the same script with the help of

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{

[code]....

then the listener does not work anymore.

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Aug 20, 2006

The problem:

I have an XHTML STRICT page which has some event listeners attached for onload and resize. I'm doing a bit of Javascript DHTML on these events. When a user changes the browser font size, the javascipt function needs to run. Although the TOPMENU DIV gets resized when the font changes size, its not a page resize so the function doesn't get run. I fixed this in IE6 by using a second function which is run onload and sets an event on the div object in the page after its been defined.

Problem is this doesn't work in Firefox.

Mozilla DOM reference says there is no resize event on a DIV so is there a work around to make it work in FIREFOX? i.e. can I force a resize event to happen on a div in firefox or is there some other event I can trap when a user changes the browser font size?

here's my js code: topmenu is what I'm trying to trap the resize event from.

this code is loaded in the head of the page.

function maindiv(){
estartup=document.getElementById("startup");
econtain=document.getElementById("contain");
emain=document.getElementById("main");
etopmenu=document.getElementById("topmenu");
emaincontent=document.getElementById("maincontent");
nopx = document.childNodes ? 'px' : 0;
contw = document.body.clientWidth - 80;
conth = document.body.clientHeight - 80;
if (contw < 0) { contw = 0;}
if (conth < 0) { conth = 0;}
econtain.style.width = contw+nopx;
econtain.style.height = conth+nopx;
if (conth >= 100 + etopmenu.clientHeight) {
emain.style.height = (conth - etopmenu.clientHeight - 100 )+nopx;
}
if (contw >= 172) {
emaincontent.style.width = (contw - 172 )+nopx;
}
estartup.style.visibility = 'hidden'
}


function fsize() {
etm=document.getElementById("topmenu");
if (typeof window.addEventListener != 'undefined')
{
etm.addEventListener("resize", maindiv, false);
}
else if (typeof document.addEventListener != 'undefined')
{
etm.addEventListener("resize", maindiv, false);
}
else if (typeof window.attachEvent != 'undefined')
{
etm.attachEvent("onresize", maindiv);}
else
{
window.alert('Failed to attach an Event Listener

Please Report');
}
}

if (typeof window.addEventListener != 'undefined')
{
window.addEventListener("load", maindiv, false);
window.addEventListener("load", fsize, false);
window.addEventListener("resize", maindiv, false);
}
else if (typeof document.addEventListener != 'undefined')
{
document.addEventListener("load", maindiv, false);
document.addEventListener("load", fsize, false);
document.addEventListener("resize", maindiv, false);
}
else if (typeof window.attachEvent != 'undefined')
{
window.attachEvent("onload", maindiv);
window.attachEvent("onload", fsize);
window.attachEvent("onresize", maindiv);
}
else
{
window.alert('Failed to attach an Event Listener

Please Report');
}

Any clues?

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in the below code I am trying to dynamically add a button and an event listener to it.

Code:
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<head>

[code]....

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I have a DIV that contains some links. I have an onmouseout event handler on the DIV, and I want it triggered only when the mouse leaves the DIV. Since there are Anchors in the DIV, onmouseout events will be generated when the mouse moves from one link to another, and those events will bubble up to the DIV. According to all the documentation that I have read, I should be able to prevent that from happening by having an onmouseout event handler for each of the anchors, and calling event.stopPropagation in the event handler. But it is not working in Mozilla and Opera, the onmouseout still bubbles up from the anchor to the DIV. I have it working in IE, but that is because IE does not support stopPropagation(), and instead uses window.event.cancelBubble=true, which Mozilla and Opera do not support. Code:

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Jul 23, 2005

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function mouseclick() {
alert("I was clicked on " + window.event.srcElement.tagName);
}
</SCRIPT>
<BODY
<H1>Welcome!</H1>
<P>This is a very <B>short</B> document.

</BODY>
</HTML>

The above script works fine in IE But not in Netscape 7.2 :((

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[Code]...

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May 27, 2009

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Here is just a simple example of what I'm trying to do - its extremely basic, I know, but I just can't figure out why it won't work.

HTML:

JS:

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