Javascript Property Listener
Oct 8, 2005
I am writing a Javascript UI component. I have already written a
"disable()" method for it, but I would like to go one step further in
order to make my component as compatible with existing HTML controls as
possible.
With standard HTML controls we can do this:
myTextField.disabled = true;
and as soon as this property is set, I assume there is a property
listener of some kind that is invoked to change the appearance and
value etc of the control.
I want to write my own 'property listener' to do this with my control.
Can I do it in Javascript or is this too "low level", requiring code at
the browser implementation level?
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Jul 24, 2006
Is there a way to make one property an alias for another? This would
mean that if the value of the original is changed then so is the value
of the alias. I tried the following example and it does not give this
type of behavior, of course. Code:
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Jul 23, 2005
I have several tags on a webpage of the same class. If the user clicks a
specific checkbox I'd like to be able to alter the display property of the
class, affecting all objects of that class.
This is an intranet application so we know that javascript will be enabled
and the browser will be IE.
How can I affect all the members of this class? Is there a way I can toggle
the DISPLAY property of a class so all the elements using that class would
be affected? Code:
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May 8, 2006
I have situation that when my page is loaded i create js object
<html>
...
<script>
function Page() {
this.page = 0;
this.result = 0
this.resultCount =1;
this.currentPage =1;
}
MyPage= Page()
</script>
then in my javascript function i use object like this:
function getPage() {
if(!MyPage) {
MyPage = new Page();
}
return MyPage;
}
but there is one problem: MyPage lost one of the property, currentPage.
When i do alert(MyPage.cuurentPage) shows mi undefined. After object
initialization everything seems to be alright, currentPage is set to 1
but when i Try use MyPage in my js code is already set to undefined.
What happen? What I'm doing wrong?
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Dec 11, 2003
I have following css code in a html file:
<style>
.myClass { color:red; }
</style>
How can I extract the value of the property "color" from the class "myClass"?
Pseudo-code (which of course doesn't work), so you get the idea:
<input type="button" onclick"alert('The CSS color is '+document.style.myClass.color)">
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Jul 20, 2005
I have a word bank for a javascript crossword puzzle I'm working on. What I
want to do is when a user clicks on a word in the word bank, it crosses
itself out. I have tried:
<a href="javascript:this.style.textDecorationLineThrough">text here</a>
to no avail. does anyone have an idea on how to do this?
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Sep 25, 2004
For a application I am writting I need to make some table columns apear and disapear by clicking on a link. I do this by changing the "style" property in the <td> tag.
The HTML is generated by ASP.NET, which automaticly sets the style property of the <td> tag to the right value. and makes links to the right Javascript function call to change a specific property.
This is the HTML output of 2 table columns: Code:
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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 23, 2011
I have more than 30 addEvent listeners i need to add to my WebApp. But the Code to dynamically add them is not working, unless change:
AddItemEvtAry[x].addEventListener('click', function (e) {document.getElementById("text" + x).value ++}, false);
to
AddItemEvtAry[x].addEventListener('click', function (e) {document.getElementById("text0").value ++}, false);
but obviously hardcoding all of those DIV IDs would defeat the purpose of the code.
Code in Question:
// Event Listeners for Incrimenting Quantities
var AddItemEvtAry = [40];
for(var x = 0; x < 39; x++)
{
[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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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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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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Oct 20, 2009
Is it possible in Javascript to detect if a browser supports a particular event listener? code...
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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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Sep 29, 2010
I am using the following code to add a keyup event listener to the body tag. It works fine in Webkit and Chrome but FF and IE just do nothing. The event never fires. However, no javascript errors occur in any browser.
here is the code:
Code:
var Body = new Object();
Body.trackKeys = function (target){
if( document.getElementsByTagName("BODY")[0].addEventListener ) {
[code].....
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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, 2005
I am wondering about what seems to be a particular quirk in Javascript
that does not allow form event listeners (e.g. "onsubmit=...") to work
properly. In the code below, I would like to set up a function
(doOnSubmit) that is called when the form is submitted.
But there is a "return false;" in the "onclick" of the button. If this
"return false" is removed, the code works as I would hope it would.
With it there, doOnSubmit is never called. Code:
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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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Mar 23, 2011
I'm working on an event driven app, which currently adds a listener to each of the relevant elements directly. I am planing on changing this to use a delegated event method but this raised the following question...Which is more expensive navigating the DOM, or adding event listeners?[code]I need to handle the click event of buttons 'b1', 'b2' & 'b3', a set of these buttons can be found in each 'a1' container but not always in the same nested position. To handle the events I need to know the class of the button clicked and the id of its 'a1' container. Would it be more efficient to:
A ) Add just one listener to the 'main' div, having to find the 'a1' containers id by inspecting each parentNode of srcElement until an 'a1_*' match is found.
B ) Add a listener to each 'a1' container, the id of the container can be easily passed as an argument.
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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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