How To Create An Event Listener?

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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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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Event Listener

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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Passing A Value From One Event Listener To Another?

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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Add Event Listener - Not Working In IE6

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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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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Object Method As Event Listener

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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Iframe Attach Event Listener ?

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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Dynamically Add (OnKeyDown) Event Listener

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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JQuery :: Append Elements With Event Listener?

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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Passing 'this' To Anonymous Function In Event Listener

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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Event Listener - Check And Activate Function?

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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Adding Window Event Listener In Loop?

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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Adding Event Listener As Attribute Breaks?

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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Passing Variable From Event Listener To Function

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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Adding Event Listener To HTML Span Tag?

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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Add An Event Listener To Change The Source Of An Image?

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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JQuery :: Event Listener Doesn't Listen After Having Used $.post?

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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Event Listener For Browser Font Size Change

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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Point Event Listener Dynamically To A Function Which Is In External .js File?

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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How To Create A Custom Event

Oct 18, 2010

As far as I know, there's no event for which a text in a textarea is highlighted. For instance, I want an event to fire when the word "your" in the textarea below is either clicked, highlighted, or brought into focus. HTML Code: <textarea> This is a text area... your text here

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Create An Onchange Event?

Apr 11, 2011

I want to create an onchange event here is my code but it doesn't work

here is my code
var cell3 = row.insertCell(2);
var element2 = document.createElement("input");

[code]....

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Create DIV And Some Other DIV's Inside It Using OnClick Event

Dec 10, 2009

how to create a DIV dynamically. Basicly, I have two labels, and depending on which one is clicked, I want some code to appear inside an existing DIV. Obviously, I will need to do this using javascript and the onClick event. To make things even more complicated, I also want some DIV's inside of the dynamically created DIV. So, the structure would be:

-Existing DIV
--DIV created by label being clicked
---Another DIV
---Another DIV

I hope this doesn't confuse anyone. I have some code for the existing DIV.

<DIV ID="container"><DIV ID="title">Order</DIV><DIV ID="body">Login <LABEL onclick="login()">here</LABEL>. Signup <LABEL onclick="sign_now()">here</LABEL></DIV>
</DIV>

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How To Create Continuous Select Event

Apr 24, 2009

I've been trying to create a continuous select, which means that by selecting an option from a select, another select will be filled with options that are relevant to the previous selection. And since I don't want the page to be refreshed, I'd like to use onchange. I've tried a lot of different stuff to do, but yet nothing works.

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Create A Link, OnClick Event Set For Some Function

Jun 23, 2006

Does anyone know how to create a link (<a> . . . </a>) with some piece
of javascript code that has the onClick event set for some function that I also wrote (not a build-in function).

I can find all sorts of samples in these disc.groups but none of them
seems to work for me.

I am focussed on Firefox, but some code that also works for IE, would
be appreciated.

BTW I know how to create elements in the html document, that is not the
problem. The problem is that I seem not te be able to set the onClick event for some created element. I tried for both a link and also for a text-element.
I can set the onClick for some built-in function like alert('Nice Day').

There are loads of examples to be found for that, and they indeed work.

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Create A New Object Each Time There's A New Onclick Event?

Jul 26, 2009

Ok. How about if I create a new object?

how to create a new object each time there's a new onclick event?

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