Binding Object Method To Event

Jun 24, 2002

I'm trying to build a Validation object, where you pass an object id and event name in the constructor. Then, you call an add_rule method to add validation rules. The constructor code looks something like:

function Validation(id, event, ...)
{
this.object = document.all[id];
this.event = event;
var obj = this.object;
obj[event] = this.validate;
}

So the actual validation function is dynamically bound to the appropriate event. The problem is that when the validate method is called, "this" no longer refers to the Validation object; it refers to the object to whose event it was bound. So, for instance, in the following code, the validate function's "this" refers to frmSubmit, not objValidate:

objValidate = new Validation ("frmSubmit", "onsubmit", ...);

Of course, I need to refer to the actual validation object's properties, but I can't figure out how. Any suggestions?

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JQuery :: Object Loses Event Binding In Internet Explorer?

Feb 26, 2010

I am working on a script to allow the user to click on an image to turn table header locking on and off. Everything appears to work fine, with the exception of one quirk that is occurring when I run the test page in Internet Explorer (7, in this case). If you click on the icon once to turn on header locking, it works. If you then click the icon again, it turns off header locking, as it is supposed to. But after that, you can no longer click on the icon. It is as if it loses the event binding. I am not removing or in anyway creating a new instance of the icon (although I did try using live() instead of click() just to be safe). Also, if I run this same page in Firefox, I do not have this problem. You can see the example page and view the complete source at [URL]

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I want each instance of an object to be able to listen for input events.
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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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Nov 14, 2006

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think I understand why, however, I would like to know if there is
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function whenever the value changes.

Is it possible to do this, or would I have to make a class for it?

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I want to bind a function to an event without having to put the entire code into the anonymous function that I'm binding to the event. How can I do this?

When I bind a function using the following code, the details function displays the error message for few seconds:

window.onload = function(){
$(".error").hide();
if (document.getElementById("featureForm")){

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I added my own 2nd class ('shareThis'), added my own id, didn't work; finally tried their own class, at300m, also doesn't work...

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Jun 16, 2011

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The following code works:

CSS:

/* COPY LINK CSS */
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[Code].....

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Jul 14, 2009

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<option value="10">10</option>
<option value="14">14</option>
</select>

And the jQuery:

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I am not seeing the JavaScript alert though.

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Sep 20, 2010

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$(document).ready(function(){
var dummy=new Array();
dummy[0]=1;

[code]....

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May 14, 2010

for (x=0;x<=10;x++) {
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Feb 2, 2011

New to javascript/jquery and have a question regarding scope. I want to bind an event within my class so it calls one of the class methods. The problem I run into is that the event handler is a anonymous function that runs outside the scope of the class, therefore it doesn't see the class methods or properties.

Is there a proper way to deal with this:
Sample code:
function myObject(tag) {
// properties
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// methods
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this.sendRequest();
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May 12, 2010

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If I add new elements to that list. and do$("appropriateSelector").toMutualSelect(); again. New elements will behave as expected but old ones will have problems. Each old element will have the same handler bind multiple times to them. That will result like toggle two times andmessingup the outcome. How do I prevent this? I am trying to clean up their bound handlers but seems no luck.

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[code]....

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[Code].....

The form is loading fine, but for some reason the submit() is not getting attached to the form. Therefore when I submit it is running member.php from the form "action". Ultimately, I want to be able to run member.php from $.post() so that I can tell member.php that JavaScript is enabled.

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I am trying some simple things with javascript and trying to use it in a object oriented way. However I am now facing a problem in which I can't access an object variable from an object method. I am using jQuery.

My code is as follows;

Code:

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[Code]...

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Code JavaScript:
/**
* Creates a controller for a document
*/
function Controller() {[code]....

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