Using An Eventlistener To Cancel An Onchange Event

Nov 15, 2006

I've got to write some javascript to listen for a select 'change' event. Unfortunately, the select box has an onchange event as well. For example:

<select name="test" onchange="document.form.submit();">

Here's my event listener:

function handle_submit() {
return false;}

function addListeners() {
if (document.addEventListener) { document.form.test.addEventListener('change',handle_submit,false);
}}

window.onload = addListeners;

Now, the event listener does capture the event, but I want to cancel the onchange event within the select box. Is that possible?

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Cancel OnChange Event

Jul 23, 2005

I Have a text box in a jsp that is pre populated. The text box should accept only numbers and it should be greater than a minimum value (this value depends on the user settings). If the user enters a value less than the minimum value, i should pop up an alert saying that the value
entered is incorrect and reset it back to previous correct value. How could i do it using onchange event of the text box.

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Jul 14, 2009

I have this function I'm firing to execute the "delete" of an entry

Code JavaScript:
$(document).ready(function() {
$(".post_tools a.deletelink").click(function() {
var container = $(this).parents('.comment').attr("id");
var scriptLoc = $(this).attr("href");
[Code]...

The function executes the alert and if the user selects "OK" it completes successfully. However, if the user chooses to back out of the process when the alert fires by closing the alert, the function does not get canceled, it completes the delete of the comment. What do I need to do to make sure the user can successfully cancel this process when the warring is delivered?

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Mar 24, 2010

I've been trying to do something and it's killing me because I can't figure out how to do it properly. I have an input box. I'm validating as the user types. Basically deleting forbidden characters as they type. I'm doing it with the onkeyup event. Problem is this looks kinda crappy because the character they type appears briefly and then get's deleted. I want to know how can I cancel the event that writes on the input box so that instead of deleting the character myself, I just cancel the event. I have no idea if the input box or the window is the one responsible for doing this.

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[Code]...

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Sep 2, 2009

I've got 4 identical combo boxes like the one below.

[Code]...

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May 10, 2011

I m going to use jquery treeview at...

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Jan 21, 2010

I'm currently facing a weird issue with the onchange event. I have a web application where each blur event makes a call the webserver to store the value of the textfield. I only want to trigger that ajax call when something has changed, so i track the onchange event on each textfield to set a flag if something has changed.

The onchange event always fires to first time when i click outside of a textfield even if i didn't change anything in the field.

I narrowed it down to the following: A prefilled textfield always fires the onchange-event the first time you leave the textfield. An initially empty textfield does not fire the onchange event.

Sample code (IE 8 on Windows 7 computer):

script:

HTML:

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Onclick Event - Js And ASP.NET - Cancel Button To Prompt The User To Verify Cancellation?

Dec 7, 2009

Doing web page with ASP/VB.NET. Have text boxes for UI on page. Two command buttons - Submit (for db update) and Cancel. I need the Cancel button to prompt the user to verify cancellation. Need OK/Cancel buttons on alert. If user selects Cancel-no action. If user selects OK then I want the text boxes cleared of user text input and focus returned to first text box. I think this may be the code but do not know how to apply it.

function Clear()
{
var res=window.confirm("Please confirm cancellation-text boxes will be cleared"); [code].....

Is this code valid or invalid for the events I need? How do I set it to fire when user clicks the ASP Cancel button?

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Sep 8, 2007

Can you see whats wrong with my code? I get the following error:

element has not properties.

function test()
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document.getElementById("statusbar").innerHTML = this.id;
}
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function init()
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//var elm_right = document.getElementById("right");
var element = document.getElementById("left");

element.addEventListener('click', test, false);
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Aug 22, 2006

Is there anyway to trigger an onChange event without actually clicking etc.

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Using An Object Method As EventListener In IE?

Aug 1, 2009

I'm working on a drag and drop HTML editor, in which blocks can be positioned. I need to build a controller which listens to mouse events and takes appropriate action (a state machine). The system is built using prototypes and objects. The Controller class looks like this (I removed some methods for simplification):

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

The method 'handleMove' is entitled to handle a mouse move on the overlay. Because the 'this' keyword would not point to the Controller object I've written a wrapper according to the W3C EventListener interface (http://www.w3.org/TR/DOM-Level-2-Eve...-EventListener). This wrapper holds a reference to the object in which the method resides that's handling the event, so that the important 'document' attribute can be reached. This document holds the document that is being edited (it's of a custom type, and not to be confused with the document as in document.body)

The problem I now have is as follows. IE doesn't seem to be able to work with event handlers following the EventListener interface, but just functions. I need to get the object's reference there as well though, but this can't be done using an anonymous function, as at the moment it will be run it will be in a different scope, and not be able to reach the controller any more.Just using a global holding that reference variable, a method I used before, is not sufficient, as there may be multiple instances of the editor running on the same page.I have no problems in FFox, Opera, and Safari. Just IE because it uses an alternative event listener model.

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This is my eventListener.
$('#ExternalLinkReadID a').click(function() {
var id = $(this).attr('href');
alert("before: " + id);
$(this).showOverlay();
alert("after");
});

<a href="readreviews.jsp" rel="#overlay" style="text-decoration:none">
<button type="button">Reviews</button>
</a><!-- overlayed element -->
<div class="apple_overlay" id="overlay"><a class="close"></a>
<!-- the external content is loaded inside this tag -->
<div class="contentWrap"></div>
</div><!-- make all links with the 'rel' attribute open overlays -->
<script>
$.fn.showOverlay = function() {
// if the function argument is given to overlay,
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$("a[href]").overlay({
mask: 'lightgrey',
effect: 'apple',
onBeforeLoad: function() {
// grab wrapper element inside content
var wrap = this.getOverlay().find(".contentWrap");
// load the page specified in the trigger
wrap.load(this.getTrigger().attr("href"));
}});};
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Jul 23, 2005

I have an array with mysql´s data. I have used this array with several text
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My question is: How could i use the event onchange to make a function which
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In JavaScripts checks for an onChange event against the value of the
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If we put some other value then it became fired...
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I don't want to use onBlur etc... Isthere any solution with onChange
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Am I right in assuming that you can NOT set focus() back to a field in
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Eg:
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Aug 7, 2006

I'm trying to get a tick box to tick automatically when the user changes the
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Can anyone see why?

function changed(x)
{
document.getElementById(x).checked;
}
<input name="changed" id="ischanged" type="checkbox" value="">
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?>
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<select id="mylist">
<option value="White">White</option>
<option value="White">Black</option>

[code]....

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=windows-1250">

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Jan 6, 2011

I would like to use some event handling on a form, not something I have done before and looking for some assistance. Here is my code:

<select name="LocO">
<option value=""></option>
<option value="O">Outside</option>

[code]....

So what I need to happen, is based on the selection of the first selection box, some of the options of the other selection boxes should not be available.If Outside is selected, everything in LocA should be available, but only up to 4 in Loc1... and if Inside is selected, only up to E should be available in LocA and everything should be available in Loc1.

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<div class="fieldValue">
<asp:DropDownList ID="discountTypeDropDownList" runat="server" AutoPostBack="True"
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[Code]....

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I want to make one application using javacript or may be it is in ajax. Let me explain my problem: I have one select box name person which have value 0,1,2,3,4,5 . Now i want that when user will select value 1 from select box then person 1 first name , last name input type box will appear only one time in a row. and if we will select 2 from select box then two row will appear naming person1 and person2 like this: if we will not select any value by default is 0.then it will not show any row regarding person.

[Code]...

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