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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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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Aug 24, 2007
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="">
<input id="nomeInput" type="text" name="nomeInput" value="" autocomplete="false"/>
[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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Jan 5, 2007
How do I add an event listener to a few text boxes that prevents the user from typing anything but digits. I use the numbers entered in the text boxes in calculations afterwards so I don't want the user to enter "one" instead of "1" etc... Also, the range of possible numbers is too big for a drop down menu.
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Mar 22, 2007
I'm writing a custom script to collect attributes from links and concatenate them to pass as a string to another function. I'm using a readily-available 'addListener' function so the click event doesn't overwrite others on the page. All this seems to be working in all browsers except IE6, and I suspect it may have something to do with event bubbling. Can anyone see my errors and any other ways I could improve the script? Code:
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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
that "this" is in scope and refers to the object instance.
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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Dec 31, 2009
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
document.getElementById(elem[i].id).addEventListener(thisEvent,thisAction,false)
}
}
}
HTML Code:
addEventToElement('form_name','input','text','keydown','return numbersOnly(event,this);');
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Jul 23, 2009
I tried to append a table row to a table by clicking on a button. And inside the table, I put a link so i can click that and remove the row. I was using jquery.flydom plugin, by the way. [code]...
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Jun 10, 2010
I'm working with nested functions and trying to pass a 'this' value to an anonymous being used in an assignment for an event listener.So, this should plop a button inside our DIV and when clicked I'd like it to run the alert-ding; unfortunately it seems to want to run the function as defined under the buttons object which doesn't work out too well.
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Jun 28, 2010
Event Listener. From what I understand it will check all events until a defined event happens, such as rollover of a certain image, and then it activates a function? What I want to do is use this so that when I rollover a element such as below:
<img src="img url" alt="this is a tooltip" tooltip="true" />
I want it to pass the obj to a function which then runs, and then once the mouse of not over that element it will activate another function passing the previous object to this function.
Although an element such as the example below would not activate these functions:
<img src="img url" alt="this is a tooltip"/>
As the tooltip tag does not exist or has the value of false. Also, wouldn't this use a lot of resources as it checks every event which the mouse passes over?
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Sep 19, 2011
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);
document.links[i].onmouseout=changeIframeSrc(null,'none',0,event);
[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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Nov 5, 2009
I need to pass the 'id' variable from the event listener to the callback function, 'moveObject'. The moveObject function needs to know the id of which element it should act upon. How can I pass this variable?
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Aug 18, 2010
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:
document.getElementsByTagName('span').addEventListener('click',doSomething,false);
function doSomething() {
alert(this);
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Mar 22, 2011
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.
var start = new Image();
start.src = "start.jpg";
ctx.drawImage(start, 50, 50);
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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
$.post("do/setFieldVal_Input.php", {table:table, whereFieldName:whereFieldName, whereVal:whereVal, setFieldName:setFieldName, idHtml:idHtml}, function(data)
{
[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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Apr 9, 2011
in the below code I am trying to dynamically add a button and an event listener to it.
Code:
<html>
<head>
[code]....
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Apr 5, 2011
I got following document:
When you click the main button, will one of the six images get a background image, and you can then press the image with the background image, and get your "reflextime".
But it won't work. When I press the image, were the new background image has shown, you can click on it and get your time - why?'
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Dec 11, 2003
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
Does Event handlers work in netscape.
<HTML><SCRIPT LANGUAGE="JScript">
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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Jun 3, 2011
first of all, I am fairly new to jquery. I have already played around with it quite a bit, but I do not fully understand the way it works as of now. Right now I am having problems getting .submit() to work; let me provide you with a bit of code for better understanding:
[Code]...
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May 27, 2009
When I register an event handler directly into the HTML tag everything works fine, but I'm trying to register them from the external JS file where the function is, and that doesn't work at all. I've read that this is called the "traditional method" and that it should work.
I've tried it a million different ways, but what I'm putting below AFAIK is correct... but it just doesn't work. I've tried it in Firefox, IE, and Chrome - and used the "Inspect element" feature in Chrome, and am not getting any error messages.
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:
(Again, it works perfectly when I stick the onclick="message()" event handler directly into the HTML h1 tag, but not when in the external file.)
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Jun 23, 2009
I am trying to make one application. When we slect value from select box . It will show same type of row according to which value we select from select box.
Let me explain my problem: select box have value 0,1,2,3 . When we select 1 then it will show one row below the select box naming person1 name (input box for name of person1). if we will select value 2 from select box then it will show two row according to select value Like this
person1 Enter Name of person1
person2 Enter Name of person2
By default it have value 0 then it will not show any row below the select box.
i want to do this. But i do not know how i can do this . I think for this i have to onchange event in select box .But in correct way i do not know how it is possible.
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