I'm having problem setting up event handling using member functions. Consider the following code snippet:
function Widget()
{
this.register = function()
{
document.getElementById(this.id).addEventListener('click', this.default_click_handler, false);
}
this.default_click_handler = function(event)
[Code]...
I'm having problem setting up event handling using member functions. Consider the following code snippet:
Code:
The problem is that I get a
Code:
I am trying to create a script that will cover cross-browser limitations in adding event listeners to elements. I have found plenty of resources to add a listener but can't find any way of assigning a function containing arguments. Here is what I have so far:
/* Attach events regardless of browser */
function addEvent(obj, evType, fn)
{
if (obj.addEventListener)
{
obj.addEventListener(evType, fn, false);
return true;
}
else if (obj.attachEvent)
{
var r = obj.attachEvent("on"+evType, fn);
return r;
}
else
{
return false;
}}
/* Contains all attachments to be made on page load */
function load()
{
item = document.getElementById('toggleControl');
addEvent(item, 'click', toggle);
item = document.getElementById('alertLink');
addEvent(item, 'click', runAlert);
}
/* Add event to page load and assign load() function */
addEvent(window, 'load', load);
The actual functions for toggle and runAlert are in a seperate .js file, but are standard functions. the problem is that I can't find a way to perform the equivalent of:
item = document.getElementById('toggleControl');
addEvent(item, 'click', toggle('toggleID'));
It simply does not work.
I am trying to get the price updated based on users dropdown selection for Member and Non-Member and also multiply it by how many they want.Should I use javascript on the page or split the page into two where 1st one would collect basic info and if they are member or non members and second would collect quantity?
View 1 Replies View RelatedI using JQuery to call back asp.net web service, The web service is simple, only query from SQL Server and return result as JSON. everythings is cool. Only problem is the key of dictionary after Deserialization by eval() method,It cannot access. For example:
[Code]....
I am facing the above problem for a chatroom app that I am making. People will enter and exit the room any time they want, so i need a member list that updates itself to reflect this on the screen of all users that are in the chatroom. What i have thought of, is to have JS call a PHP function on specific intervals, and that PHP function will retrieve user data from a database and pass it to JS to display on the list. Is this method advisable? Are there any more suitable ways of doing this? I am thinking of applying the same theory for displaying and retrieving chat messages, but i get the feeling that something's missing for this, or maybe this method is not right for displaying messages.
View 1 Replies View Relatedi'm a listing a member list with jquery autocomplete and i am currently trying to add a minlength of 3 but i doesn't work and i don't really know why. Here the code
<?php
$mysql_host="localhost";
$mysql_user="root";
$mysql_pw="";
[Code].....
Is there any way to call a method of a 'class' in without creating an instance of this class?
View 2 Replies View RelatedThis is a calculator that calculates how much a user can earn from their referrals depending on the user's Level & Member type. It's supposed to be updating live (onChange) when the user types in new values in the fields, but nothing is happening. [URL].
Code:
<html>
<head>
<script type="text/javascript">
function calculate(){
// eval makes the script know the value is a number, and not text
var myLevel = eval(document.earningsform.level.value);
var memberType = eval(document.earningsform.type.value);
var viewed = eval(document.earningsform.viewed.value); .....
I own a GPT site that offers member Daily SUrveys. When a daily survey is completed, the time of completion is stored in SQL in Unix time format. I hired a guy to code a Countdown timer for me that would be placed next to every completed offer in member's panel and that would show how much time is remaining till the Daily surveys resets and becomes available to the member for completion again(Daily Surveys reset every 24 hours)
[Code]....
Lets say I wanted store a long string of text into a local storage member on a browser using javascript.
window.localStorage.setItem("key",longStringText);
Now lets assume that the text itself contains characters outside of the normal ISO-8859-1 character set (like asian or russian characters). Would the individual char values be stored as one byte or two bytes?
"hello" -> 5 * 1 bytes = 5 (normal 8859 character sets)
"hello" -> 5 * 2 bytes = 10 (unicode or an extended character set size).
Is ISO-8859-1 still stored like ASCII once was as 8 bits? Or is it 16? If I was to use a 2 byte character set then would that cut the size of my allocated local storage space by half?
This makes my life a bit easier. After executing this script you should be able to addEventListener on all elements instead of determining if you want to call attachEvent or addEventListener.
Edit: This is the original version. The revised version is below
if (!document.addEventListener && document.attachEvent)
{
Object.prototype.addEventListener = function(eventName, func, capture)
{
if (this.attachEvent)
this.attachEvent('on' + eventName, func);
}
var i, l = document.all.length;
for (i = 0; i < l; i++)
document.all[i].addEventListener = Object.prototype.addEventListener;
window.addEventListener = Object.prototype.addEventListener;
document.addEventListener = Object.prototype.addEventListener;
}
Revised version:
This one is harder to use but it is nicer to the DOM and all newly created objects. The problem with it is that addEventListener will only be available after the page loads.
If you want to use addEventListener from a window.onload script make sure that this code is included in the body, not in the head. document.body.onload is called before window.onload.
Now, only elements that already have attachEvent will get an addEventListener. Elements created with document.createElement will automatically get addEventListener.
function createIEaddEventListeners()
{
if (document.addEventListener || !document.attachEvent)
return;
function ieAddEventListener(eventName, handler, capture)
{
if (this.attachEvent)
this.attachEvent('on' + eventName, handler);
}
function attachToAll()
{
var i, l = document.all.length;
for (i = 0; i < l; i++)
if (document.all[i].attachEvent)
document.all[i].addEventListener = ieAddEventListener;
}
var originalCreateElement = document.createElement;
document.createElement = function(tagName)
{
var element = originalCreateElement(tagName);
if (element.attachEvent)
element.addEventListener = ieAddEventListener;
return element;
}
window.addEventListener = ieAddEventListener;
document.addEventListener = ieAddEventListener;
var body = document.body;
if (body)
{
if (body.onload)
{
var originalBodyOnload = body.onload;
body.onload = function()
{
attachToAll();
originalBodyOnload();
};
}
else
body.onload = attachToAll;
}
else
window.addEventListener('load', attachToAll);
}
createIEaddEventListeners();
Today I have been testing the event models from Netscape 4.8 and IE 4
to the current crop of browsers. I'd like to write a small event
library similar in purpose to the Yahoo! UI event library but with less
features and code. The Yahoo! event library is one of the best
libraries in YUI but it still seems to me to have some confused
code...that or I'm still confused.
The Yahoo! UI library focuses on using addEventListener and
attachEvent. However, due to the click and dblclick bugs in Safari a
long legacy event workaround is included to use a Netscape4-type event
model for Safari. Something like this
var listeners = [function(event){}, function(event){}];
document.getElementById('blue').onmouseover = function(event) {
for (var i=0; i<listeners.length; i++) {
listeners[i](event);
}
};
With this above example, multiple handler functions can be fired for a
single event. I imagine that this is an old trick that has been around
for a long time, yes?
With all the new browsers I tested with this legacy workaround, the
listener handlers can use event.stopPropogation() or
event.cancelBubble=true and they work as desired. The handler functions
can also use event.preventDefault() and event.returnValue=false and
they too work. These seem to work because the event object passed to
the handlers is a modern event object and not one from Netscape4.
My question is, if Safari needs this legacy workaround, and the legacy
workaround seems to work in all the browsers that have addEventListener
or attachEvent, then why bother with the addEventListener and
attachEvent functions at all? Why not just use the legacy way for all
browsers and all type of events.?
I was using this script to learn how to use event listeners and I need to know how to make it work for IE. I keep finding attachEvent scripts that look like they will work, but I get nothing. I've spent several hours finding script after script that simply don't work. I don't know where to turn next. Any script to attach these events to IE?
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "[URL]">
<html>
<head>
<title>Test</title>
</head>
<body><div>
<script type="text/javascript">
if(!Array.prototype.link)
Array.prototype.link = function(f) { for(var Obect1 = new Array(), i = 0, n = this.length, t = arguments[1]; i < n; i++) Obect1[i] = f.call(t, this[i], i, this);return Obect1;};
Array.prototype.linkMethod = function(m) { var n = this.length, args = this.slice.call(arguments, 1);if(typeof m == "string" && n > 0) m = this[0][m];for(var Obect2 = [], i = 0; i < n; i++) Obect2[i] = m.apply(this[i], args);return Obect2;}; .....
I'm trying to add a clickevent to an anchor that I created trough DOM.
This his how the code looks:
var oSubLink = document.createElement("A");
oSubLink.appendChild(document.createTextNode("+"));
oCel.appendChild(oSubLink);
oSubLink.addEventListener("click", klapUit(oTabel.id, eigenschappen[2]), false);
It failes at the addEventListener call, saying "No such interface supported" (appears to be one of the two default error messages IE gives when it can't handle your JS :mad: ).
How can I fix this? The solution should work in IE6, FF, Opera, Mozilla and Safari.
Is there a way to send parameters to the function being added to an event with addEventListener. I.E. say you have this function
Code:
function someFcn(i){
alert(i);
}
and I add it to an object.
Code:
someElement.addEventListener('focus', someFcn, false);
Is there a way to send a parameter to someFcn.
For Example I have tried this but it failed
Code:
var someString = 'Hello World'
someElement.addEventListener('focus', someFcn(someString), false);
I have this code:
for(var h:Number=0; h<4; h++){
var Build : Button;
Build = new Button();
Build.height = 20;
[Code]...
When you use addEventListener (or addEvent in IE) to call an object
method, does it call it with the correct this parameter?
The ECMAScript reference has a lot to say about the caller using
Function.prototype.call or Function.prototype.apply and passing the
correct this pointer for the context, but how does addEventListener
determine the correct this pointer. Or does it just punt and pass the
global context, thus making it impossible to refer to the object this
in an object method used as an event listener?
Is it possible to add events using addEventListener to multiple radio buttons with same id ?
<input id="radId" type="radio" value="0" name="radioname">No
<input id="radId" type="radio" value="1" name="radioname">Yes
I tried to attach event using document.getelementByID BUT it always picks the first radio button.
Task: I would like to implement a CtrlEnter event that would work on both IE and FF.
My approach: use addEventListener() and attachEvent() to capture the event then trigger a function to check for CtrlEnter:
if (oTarea.addEventListener) {
oTarea.addEventListener('keyup', function() {checkCtrlEnter(event);}, false);
}
else if (oTarea.attachEvent) {
oTarea.attachEvent('onkeyup', function() {checkCtrlEnter(event);});
}
function checkCtrlEnter(e) {
if (e.ctrlKey && e.keyCode == 13) {
// do something
}
return false;
}
As I understand it so far:
element.attachEvent()
IE 5+ for PC
element.addEventListener()
Gecko, KHTML
element.event
NS3+, IE4+, dunno about opera or others
Since I'm only concerned with attaching a single event and don't care about bubbling/capturing, am I best off not using the old style of event registering to assure maxium compatibility?
I have got a following function:
PHP Code:
function addEvent(obj, type, fn) {
if (obj.addEventListener)
[code].....
I've been using window.onerror to capture and report JavaScript errors
from other users for debugging an application I've written. But I've
run into a strange issue with Firefox and window.onerror.
It seems that any code that executes, having originated from an
"element.addEventListener", causing an error does not activate
"window.onerror". But it does at least show up in Firefox's JavaScript
error console. Internet Explorer doesn't appear to suffer from the
same issue when it uses it's equivalent "element.attachEvent".
Does anyone know why this is and if there is any workarounds or if it's
possibly a bug? Code:
i'm loading a simple svg file with the embed html tag:<embed height
='280
' id
='map
[code]....
I've created an object and within this object, I've added an eventlistener. But the problem now is that after addEventListener is being called to access a callback function, the callback function is not able to access the properties within its own class. Code:
View 14 Replies View RelatedI use addEventListener and I cannot (or at least don't know how) pass arguments to the function.
Let's say we have a function:
function warning(arg1, arg2) {alert('Argument 1: ' + arg1 + ', Argument2: ' + arg2 + '.');}
It's possible to have:
onclick="warning('my argument 1', 'my argument 1');" as an html attribut.
But I think it's not posible to do it like this (still the same function):
el.addEventListener("click", warning('my argument 1', 'my argument 1'), false);
So how can I pass arguments to the function?