I can use "with" like this:
function MyObject(message)
{
this.message = message;
}
function _MyObject_speak()
{
alert(this.message);
}
with (MyObject)
{
prototype.speak = _MyObject_speak;
}
I was wondering why I can't use "with" like this:
with (MyObject.prototype)
{
speak = _MyObject_speak;
}
According to ECMAScript, the root of the prototype chain is Object.Prototype. Each object has an internal property [[Prototype]] that could be another object or NULL.... However, it also says that every function has the Function prototype object: Function.Prototype, it confused me, because a function is an object, for a function object, what is its function prototype and object prototype..For example:
var x = function (n) {return n+1;};
what is the relationships of x, Object.Prototype and Function.Prototype
I am trying to get to the bottom of javascript object, prototypes etc. I have a fairly good grasp of it, but I get confused the closer I get to the base object.prototype. FIrst of all, I was under the impression that all objects descend directly from Object. But some objects (like Array) seem to inherit properties and methods from the function.prototype. So does this mean that the chain is like this:
object -- function -- array Second, I noticed (on the mozilla javascript reference site that object.prototype inherits properties and methods from function.prototype and vice versa!? How can this be? I must be missing something important about understanding the chain?
One of the complaints about prototype.js (google for it if you're not
familiar with it) is that it's poorly documented. I have this inkling
that the key to understanding prototype.js is in the bind function.
The problem with Javascript is that the "this" operator is poorly
overloaded and it is often hard to understand in the context of
object-oriented javascript
So, let's start with the definition:
Function.prototype.bind = function(object) {
var method = this;
return function() {
method.apply(object, arguments);
}
}
As I read this, it states that all functions (which are themselves
objects) will, in the future, have an associated method called "bind".
The function() function, so to speak, simply instantiates a Function
object with the parameter list and then evals the statement, sticking
the resulting execution-tree in the current code frame.
The "this" there refers to the function object associated with the call
to bind(), right? But the word "arguments" there refers to the
arguments passed to the function object *generated by* the call to
bind().
In every example within prototype.js, bind() is called either in a
constructor or within a method contexted to a javascript object, and is
always called with "this" as its argument, e.g.:
this.options.onComplete = this.updateContent.bind(this);
As I read the code it seems to be stating that the "this" object
referred to within bind()'d functions are being coerced into always
referring to the current instantiated object.
But isn't this always the case anyway? Is this a rather confusing
attempt to ensure "this" purity whereby the call
method.apply(object, arguments)
is forced to always have the reference to the containing object present?
I think I've got it. Bind() generates uniq functions that contain live
references to the objects to which they belong, such that the function
object can then be passed to setTimeout() or onMouseOver(), handlers
that accept functions but not objects.
Lets say we run: window.alert = function() { };
Is there anyway to 'restore' the original alert() method or is it gone
forever?
I know you can do window.alert = Window.prototype.alert, but lets say
you also set Window.prototype.alert = function() { } or lets say we're
in Opera, which doesnt have a Window "class".
I would like to set up an event observer outside of an object, so I
can't use this.bindAsEventListener. How can I pass the correct object
reference?
I tried something like this, and various other variations, but no luck.
This works when I set it up from inside the object, using "this.",
Event.observe(targetId,'click',targetId.select.bin dAsEventListener(this),false);
I wanted to add an object as a prototype to separate my methods more
nicely, however, I ran into a couple of problems. Apart from the
obvious "scope" issues I found that any instances of my class shared
the objects methods and properties.
I realise (now) that this is actually how prototypes work, they share
functions and objects rather than create new instances of them for
every "class", but is there any way around it? (or shouldn't I be doing
things like this at all?) Code:
I am working on my own pop up calendar, mainly because the one I am currently using crashes the Safari browser at times.
So, I want to verify that what I am doing will work, in that I want to be able to have multiple calendars open at the same time, each independent of the other.
So, I start it off with:
var Calendar = {
dateSelected: null,
topPos:null,
leftPos:null,
somefunction:function(e) {
...
}
};
If I create more than one calendar object, will they have their own variables, in that the dateSelected, topPos and leftPos will be unique to that instance?
Or, is there a better way to do this, that is cross-platform.....
In my research in the javascript language I have encountered problems
with implementing prototype inheritance while preserving private
methods functioning properly. Here is an example: Code:
I want ask you if, for a web portal/application, is better prototype or Jquery? I don't want to innesc some type of flame, but after the announce that drupal use JQuery and that the new Wordpress
2.2 use Jquery I ask myself if my choice of use prototype.js is the bettere choice.
I have <div id ="changeable"> with some html in it. I have a link that calls the function to replace the info in the div. The problem is that the "creative_development.inc" file is added to the top of the div and does not replace the content. How do I replace the content, and not just add content?
View 1 Replies View RelatedI'm trying to make an addEvent function that will automatically attach itself to the object using a class.
My question is how can I add the function so when I write obj.addEvent("click",myfunction); it will add the event?
Here's my current function:
this.prototype.addEvent = function(type,fn)
{
if(window.attachEvent)
this.attachEvent("on"+type,fn);
else if(window.addEventListener)
this.addEventListener(type,fn,false);
}
I need help to workaround the following problem:
First, about the environment:
- The web pages automatically generated.
- Pages can be inserted to each other
- When a subpage to be inserted is being generated, it does not know will it be inserted or not.
- That because each subpage uses the <script src=...> tags to load the script it needs.
- in the external script files I'm trying to protect it from repeated execution checking (if(){}) the value of a variable which is created after in the script.
Everything worked fine until I tried to use the .prototype to declare the method of my objects.
In the Internet Explorer, I got "Object does not support this property or method", on the access to a prototype function, because the prototype of my object was deleted by itself after the second load of the external script. Code:
This function will return an array of the elements in a page that contain a certain attribute, you can also give it a value that the attribute has to match, a tag name that the element has to match and a parent element.
I know there are other functions for doing this, but this one is written for use with the prototype (http://prototype.conio.net/) JavaScript library, in fact its really just a modified version of the getElementsByClassName() function that’s part of prototype.
document.getElementsByAttribute = function(attribute, value, tagName, parentElement) {
var children = ($(parentElement) || document.body).getElementsByTagName((tagName || '*'));
return $A(children).inject([], function(elements, child) {
var attributeValue = child.getAttribute(attribute);
if(attributeValue != null) {
if(!value || attributeValue == value) {
elements.push(child);
}
}
return elements;
});
}
Usage is pretty simple, this will return all elements with a width attribute:
I try to get a xml-response with prototype. for e.g. i have the following code:
<html>
<head>
<title>Test Ajax</title>
<script src="prototype-1.3.1.js" type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
var getXML = function()
{
var myAjax = new Ajax.Request(
"bsp.xml",
{
method:'GET',
onComplete:showXML
}
);
}
var showXML = function(r)
{
var names = [];
var root = r.responseXML.getElementsByTagName('personal').item(0);
// root
for (var i = 0; i < root.childNodes.length; i++)
{
var node = root.childNodes.item(i); // mitarbeiter
names.push(node.childNodes.item(1).firstChild.data);
}
$('xml').innerHTML = names.join("<br />");
}
//]]>
</script>
</head>
<body>
<p>
<a href="#" onclick="getXML();return false;">TEST</a>
</p>
<div id="xml">
</div>
</body>
</html>
xml-Data:
<?xml version="1.0" ?>
<personal>
<mitarbeiter>
<vorname>John</vorname>
<name>Brown</name>
</mitarbeiter>
<mitarbeiter>
<vorname>Matt</vorname>
<name>Blue</name>
</mitarbeiter>
</personal>
This works fine in IE but in Geko-Browser i got nothing back, because this browsers build the DOM with linebreaks and whitespace. Do you have any ideas what is wrong in my code and how to get propper DOM?
Having read through Sergio Pereira's Prototype documentation I came across the grep command within Enumerable object.
This is something that looks very interesting. Such as being able to quickly select only the elements you want using a regular expression.
But for the life in me I can seem to get it to work.
Anyone a bit more up to speed with Prototype care to have a look?
var elementList = Form.getElements("just-a-form");
nodes = $A(elementList);
var localElements = nodes.grep( /image/, function(node){
return node.id
});
I'm using Prototype's AJAX to get the "alert" the response of a simple PHP script (a script that echoes a single line), but it doesn't seem to work. Here's the code:
function init()
{
var url = "http://localhost/script.php";
var myAjax = new Ajax.Request(
url,
{
onSuccess: showResponse
});
}
function showResponse(response)
{
alert(response.responseText);
}
window.onload = init;
The code has no errors, but still doesn't show the response even if i add an onFailure event handler. What could be wrong?
OK, simple script that currently takes an array of ID values (hard coded) and then iterates through them to fade in and out creating a slideshow.
The obvious problem is I have to hard code the number of DIVs in the slideshow. What I really want is the code to get the child elements of the container I pass it and then iterate through them dynamically.
[Code]...
I am trying to use the sortBy function in the prototype.js
library. Nevertheless, I can't work out what to include in the iterator
function. Can someone shed some light on this?
I've created a new class using prototype.js. After I make the ajax.request all references to this.myClassMethodorVariable are lost. Does the ajax method blow out the object persistance? I'm fairly new to OOP javascript so could be (and probably am) overlooking some detail. Code:
View 45 Replies View RelatedThe following code works great in FireFox, Opera, Netscape, Safari, and
Gecko, but NOT IE. Why?
I tried using 'native' js with setInterval and setTimeout, but I get
the same result. My IE security settings are not an issue. Code:
Can anyone tell me what the difference is between these two protoype
methods? They are extensions of Javascript's Function class.
Is bindAsEventListener just used to be compatible with IE's Event
model? I'm thinking the only difference between the 2 methods is that
bindAsEventListener passes the event into the function.
I want to know how I can practically apply these.
METHODS FROM prototype-1.5.0_rc1.js
Function.prototype.bind = function() {
var __method = this, args = $A(arguments), object = args.shift();
return function() {
return __method.apply(object, args.concat($A(arguments)));
}
}
Function.prototype.bindAsEventListener = function(object) {
var __method = this, args = $A(arguments), object = args.shift();
return function(event) {
return __method.apply(object, [( event ||
window.event)].concat(args).concat($A(arguments)));
}
}
i am trying to make the contents of one drop-down box dependent on the
contents of another using AJAX (prototype.js) and PHP
I have it working so that a new dropdown appears when i select a value
in the first dropdown:
<?php echo $html->selectTag('Review/cruiseline', $cruise_lines, null,
array('onchange'=>'new Ajax.Updater('test', 'ships?variable=12',
{ method: 'get' }, {asynchronous:true, evalScripts:true});'), null,
true, false);?>
In my php script (which is located at URL 'ships'), I am just getting
the value of 'variable' from the $_GET super global but I obviously
want that value to be dynamic and equal to the value selected in the
dropdown.
So the missing piece is passing the selected dropdown value from
HTML / Javascript to PHP. Anyone know how to do that?
I am wondering why the following works, on IE6, but with an error : "Not
implemented".
function TEST(){}
TEST.prototype.Initialize = function()
{
var mImage = new Image();
var mDate = new Date();
var start = mDate.getTime();
mImage.onload = this.Alerting(start);//WORKS with ERROR "Not implemented"
//mImage.onload = function(){this.Alerting(start);}//ERROR "Object doesn't
support this property or method"
mImage.src = "winxp.gif";
}
TEST.prototype.Alerting = function(i_string){alert(i_string);}
var mTest = new TEST();
mTest.Initialize();
Can anybody guess why?
Does this sound useful?
HTMLFormElement.prototype.toJSONString
Grab the state of the form, as if it were going to be submitted and
return the value as a JSON string where keys are form element names.
(checkbox (groups) and select-multiple would map to an array).
I tried to write sample code to get understanding of javascript's
prototypal inheritance (along with the variety of function calling
choices.. )
During the process, I got myself throughly confused.
Can anyone explain following behavior [NOTE: Needs firefox+firebug.
otherwise replace all console.* to alert or equivalent]
here is my code:
<html>
<head>
<script type="text/javascript">
function MyClass(){
if(String(this) == '[object Window]'){
console.debug('Are you sure to use this object in global scope?? Or
you just missed using 'new' keyword?');
}
this.method = function(){
console.info('in MyClass.method');
}
this.param1='param1'
}
function caller(){
var execClsDirectly = MyClass();
var execClsConstructor = new MyClass();
// execClsDirectly would be null since MyClass does not have any
return statement
if (execClsDirectly) execClsDirectly.param2='added global fn call'
execClsConstructor.param2='added to obj instance'
var clsRef = MyClass;
clsRef.param2='added to class definition'
MyClass.prototype.param2='added to class'
console.log('execClsConstructor param2: '+execClsConstructor.param2);
console.log('outer param2: '+MyClass.param2);
var updatedClsConstructor = new MyClass();
console.log('updatedClsConstructor param2:
'+updatedClsConstructor.param2);
}
</script>
</head>
<body onload="caller();">
</body>
</html>
the output:
Are you sure to use this object in global scope?? Or you just missed
using 'new' keyword?
execClsConstructor param2: added to obj instance
outer param2: added to class definition
updatedClsConstructor param2: added to class
I of course understand the first line of output, but.. confused as to
same param2 added into MyClass gets added into three different levels.
Can anyone elaborate this?