Different Methods Of Selecting Some Of The Values In The Json Object
Aug 10, 2011What are the different methods of selecting some of the values in the json object below:
what different selecting methods can you use to get the date, or the views?
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Object Methods - Assign A New Function To A Built-in Object In Firefox
Jul 1, 2009Can assign a new function to a built-in object in Firefox:
But IE and Opera don't have a MouseEvent or HTMLElement that can be set up in the same way. Can you do this in IE or Opera, or just Firefox, and maybe Webkit?
JSON Accessing "numbered" Object Values?
May 10, 2011I guess I'm really thick, but I am going crazy with this JSON object:
Code:
var json={
"item":"random",
"results":{
"1":"test"
[Code]...
Executing Object Methods Is Killing Object Properties
Mar 20, 2010I created a method for displaying an object's properties:
As long as renderfunction = false, the object is fine coming out of this function.
However, if I change renderfunction to true, all my properties become undefined. Why isn't this working as I expect it to?
Accessing An Object's Methods
Sep 8, 2005I have a javascript function that needs to access methods of a java
object(localTag). In my JSP I'm trying to include hidden fields for
the Strings returned from the getter method calls of the object like
so:
<html:hidden name="FrmCustomerHolding" property='<%=
"localTag.getTagName()" %>' />
<html:hidden name="FrmCustomerHolding" property='<%=
"localTag.getTagValue()" %>' />
If I can do something like this, what is the correct syntax and how do
I access this property in my javascript? When I have a hidden field
that is just a String, I access it in the javascript like
"document.getElementById("theString").value" and it works fine, but I
can't seem to find how to access the String value of a method call.
Using Object Methods In AddEventListener
Jul 20, 2005When 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?
Coupling Between Object Methods?
Jun 10, 2011I have more of a programme design related question here: I have an object with 2 methods, those two methods are supposed to be called repeatedly one after the other (e.g. by setInterval())
window.setInterval(function() {
obj.method1();
obj.method2();
}, 100);
the problem with this code is that the execution time of those methods may increase depending on the processed data (an array with several hundred elements or more) so it may be, that the execution time of both methods exceeds the given repetition time. I could solve that by placing a call to the next function in each method, but I wonder if that is good design or not (tight coupling)
code for method2() is analogue
Obj.prototype.method1 = function ()
{
/* working code here */
[Code]....
What Methods Does Every Object Have By Default
Dec 8, 2011When a custom object is created in javascript, then methods need to be defined for this object. Still every object has toString() method available to them, even if it is not defined. How is this method available to all the objects ? Is it inherited from some root object ?
Is sort() method available to all the objects ? What are the other methiods available to all objects ? Where can I get list of available methods ?
Memory Requirements For An Object's Methods
Jul 23, 2005I am a little confused how the memory for objects is allocated in
JavaScript. David Flanagan, in "javascript: The Definitive Guide,"
states that each property of a class takes up memory space when
instantiated. So space is created for aMethod three times in this
example: Code:
JQuery :: Add Methods That Contain 'this' To An Existing Object?
May 18, 2011Let's say I have a Javascript object that looks like this:
{
events: {
"comments:added": this.add,
"comments:removed": this.remove,
"comments:fetched": this.addAll
}
}
I'd like to add this method to it, either manually, using $.extends() or _.extends():
[Code]...
Remembering Object Properties And Methods
Jan 17, 2011Do many programmers remember most of the object properties and methods or do they use IDE or references to find those specific objects. I'm starting to learn Javascript and seeing all the different type of objects available can be depressing. :(
View 2 Replies View RelatedPrivate Methods In Object Literal?
Aug 18, 2010i have something like this:
Code:
var o = {
f1:function(a) {
[code]....
Object Does Not Support Properties Or Methods?
Aug 26, 2009Code JavaScript:
function dropdown() {
}; dropdown.prototype = {
sele: $('.select'),
city: [],
scope: [],
type: [],
init: function(json) {
if(json.location.length) {
for(var i=0; i<json.location.length; i++) {
this.city[i] = json.location[i].city; .....
this.scope[i] = json.location[i].scope;
}}.....
getUrl: function() {
return location.pathname+location.search;
},
setUrl: function(paramType, param) {
return this.QueryString(paramType) ? this.setQueryString(paramType, param) : this.getUrl()+"&"+paramType+"="+param;
}};
Different Ways To Declare Methods/properties Of An Object
Jul 23, 2005Well, I've been working with JS for three years and have a great experience here. But! I still have no really acceptable answer to the following
question:
What is the principle difference between declaring methods/properties
in the constructor function body and via prototypes.
Are there any real GURUs? Let's discuss the issue.
Difference Between Privileged Methods And Object.create
Apr 13, 2010I'm attempting to understand the use of privileged methods when used with Object.create. I put together a quick demo (code below) that shows what happens when I use Object.create to create a new object based on one that has a privileged method. The outcome is not pleasant, as changing the value in the first object also changes it in the second. Unless I am reading Crockford's articles incorrectly, this makes Object.create almost useless for anything but objects that have only public members.
I've seen many JavaScript programmers use closures extensively to create private members, and that still holds to be a good programming practice. However I still can't find an elegant way to create inheritance in combination with closures in JavaScript, given downfalls such as the one I mentioned above.With all of that said I still think Crockford has a nice way of programming, creating factory functions that produce objects, staying away from the prototype property and making the language look more functional.
Here's the code to demonstrate what I'm referring to. Firebug needs to be enabled to view the console.debug output, otherwise convert them to alerts.
if (typeof Object.create !== 'function') {
Object.create = function (o) {
function F() {}
[code]....
Closures / Object References And Private Methods
Aug 22, 2010I have some confusion about the scripts below:
1) is getRule a local variable or global variable, as it has no var keyword, yet it is an inner function of Validation? So without var, I think global, but being an inner function, I think local. So I'm not sure which.
2) In this line of code: var rule = $.Validation.getRule(types[type]), getRule returns rules, which is just a local variable in Validation. I always see that you return functions, but how does returning a local variable that's just an object literal and not a function be able to return true or false? Now the value of rules is an object literal, and this object returns true or false. So we are basically allowed to use return keyword with local variables that are object literals and not functions?
3) In this line, is foo(age) being called, or is it just being assigned to bar OR is it being called and THEN assigned to bar: var bar = foo(age);
4) Now for the most confusing: age is obviously an object reference as opposed to a literal in the example. Does that make a difference in regards to closures?
Note that I read a number of books, including JavaScript Programmer Reference and Object Oriented JavaScript and jQuery cookbook, which compare primitives vs reference types and how primitive types store directly in memory whereas reference tpyes reference memory, so if one reference changes, they all change where primitive remains ingrained. But when assigning a function as a reference like this, how does that affect the object "age" when passed into bar?
Code:
(function($) {
/*Validation Singleton*/
var Validation = function() {
var rules = {
email : {
check: function(value) {
if(value)
return testPattern(value,".+@.+..+");
return true;
}, .....
$.Validation = new Validation();
})(jQuery);
Code:
function foo(x) {
var tmp = 3;
return function (y) {
alert(x + y + tmp);
x.memb = x.memb ? x.memb + 1 : 1;
alert(x.memb);
}}
var age = new Number(2);
var bar = foo(age); // bar is now a closure referencing age.
bar(10);
JQuery :: Accessing Methods And Properties On An Object Of A Passed Element?
Jan 25, 2010I have an object on the document element that allows for other components to register with it, i have a custom event something along$(document).bind("register",function(thechild)..So in the child object when they are created i call$(document).trigger("register",this);And indeed i get the DOM object. However i'm looking for the plug in object, i want to be able to call methods on the passed childobject and access it's Config.Does that make sense? How can i write a plug in that is applied to various objects that also registers itself with an 'overseer' object on the document element in such a way that i can allow that overseer object to call methods on any registered child objects?
View 2 Replies View RelatedSelecting Checkboxes And Displaying Their Values
Apr 6, 2011Here's how it goes... If you select something from a list of products, and press Order an alert box will appear saying what you've ordered. For now I'm testing it on the very first check-box and nothing happens if I check the first check-box and click Order.
<!DOCTYPE html PUBLIC "-W3CDTD XHTML 1.0 TransitionalEN" "[URL]">
<html xmlns="[URL]" >
<head>
<title>Products</title>
<link rel="stylesheet" type="text/css" href="external.css" />
<script type="text/javascript">
var txt = "";
function order(){
if (amd965.checked == true) <!-- this is probably wrong --> .....
Selecting Multiple Form Values
Oct 14, 2004I have the following function that selects all of the values in a multiple select box. Can anybody help me extend it to do this for more than one select box?
function selectAll() {
List = document.forms[0].categories;
if (List.length && List.options[0].value == 'temp') return;
for (i=0;i<List.length;i++){
List.options[i].selected = true;
}
closeMe()
}
Selecting Values In A Select Box Through Javascript
Sep 16, 2006I've searched everywhere for this but can't find it. How can I select a particular value in a select dropdown box using javascript? (I.E a select box has 5 values, how can I select the 3rd?)
View 1 Replies View RelatedJQuery :: Selecting The Values Of Radio Buttons?
Jul 27, 2009This is probably simple, but I am new to jQuery and am trying to wrapmy head around things.Basically what I am trying to do is a very basic quiz. I have 3 groupsof radio buttons (3 questions with 4 possible answers for eachquestion, so.. multiple choice).Each answer has a number value assigned to it, i.e. value="2". Thiswould be 2 points.After pressing a button I need to be able to select all the radiobuttons have that been checked, and then add all their point values upand give the user a score.
View 3 Replies View RelatedLiteral Notation: Change Values Of A New Object Without Changing The Parent-object?
Oct 9, 2010I have the following code:
A = {
"value": "a",
};
B = A ;
B.value = "b";
alert (A.value); // => b
I expected A.value to be "a". how can I change values of a new object, without changing the parent-object?
JQuery :: Receiving And Alert With [object Object] When It Should Be Alert The JSON Data
Jun 10, 2010jquery code:
$.ajax({
url: "validate_livestock_form/index/",
type: 'POST',
dataType: "json",
data: form_data,
success: function(data) {
alert(data);
[Code]...
php page is echoing out:{"species":"Please select a species!"} I double checked the response from the php and firebug shows the same. On success alert is not alerting the JSON data instead, I'm receiving [object Object]. Why is that and how do what should I do to fix this?
JQuery :: Selecting Immediate Children Only In Object
Feb 12, 2010Taking the following markup
<div id="menu">
<ul>
<li><a id="home" href="#">Home</a></li>
<li>
<a id="about" href="#">About</a>
<div>
About sub menu
</div>
</li>
<li>
<a id="products" href="#">Products</a>
<div>
<h2>Books</h2> .....
How can I grab the immediate li children only and not all of the li that fall in this object. The following gives me every single <li> which is not what I am looking for.
(function($){
$.fn.extend({
myplugin: function(options){
return this.each(function(){
// the object we are working with
var obj = $(this);
// get a list of menu items
var menuItems = $('li',obj);
});
}});
})(jQuery);
JQuery :: Understanding To Get JSON Values?
Jul 31, 2011im using the autocomplete function to retrieve data values from a database using jquery/ajax/jsonafter web service call my data.d is shown in this format
{ 'Suggestions' : [ { 'Value' : '48', 'Label' : 'Chocolade'} , { 'Value' : '41', 'Label' : 'Jack's New England Clam Chowder'} , { 'Value' : '27', 'Label' : 'Schoggi Schokolade'} , { 'Value' : '19', 'Label' : 'Teatime Chocolate Biscuits'} ] }
[code]....
Using GetElementsByTagName On JSON Object?
Jul 15, 2011I have an array of HTML tables created in PHP which I send as a XMLHttpResponse encoded with JSON. Is there was a way I could access the table elements which are now in the JSON Object?
Relevant bits:
PHP code:
$verificationListsResponse = array("classeList" => "$classeList", "workCodeList" => "$workCodeList");
$searchResponse['verificationLists'] = $verificationListsResponse;
print json_encode($searchResponse);
[Code]....