Returning ResponseXML, Set Within An Anonymous Function, Only Once ReadyState = 4

Dec 4, 2006

I have several functions with code along the lines of:

var xmlDoc = requestXML("ajax.asp?SP=SelectRelatedTags&tag=" +

The requestXML() function includes the code:

var xmlDoc = null;
http_request.onreadystatechange = function() {
if (http_request.readyState == 4) {
if (http_request.status == 200) {
xmlDoc = http_request.responseXML;
} else {
alert('There was a problem with the request.' +
}}};'GET', url, true);
return xmlDoc;

However, the last line (the return) executes before the readyState
reaches 4. How do I return the xmlDoc to the functions only once the
xmlDoc has been assigned? I tried putting the return statement in a
while loop with the condition that the readyState must = 4 - this
worked, but makes the browser popup a message saying the script is
slowing down the system.

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ResponseXML Keeps Returning "null"

Jun 10, 2011

I have tried debugging using the alert function and have come to the conclusion that the responseXML property keeps returning null even though I have set everything correctly.

Here is the source code:

HTML Code:

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AJAX :: Pass Variable And Httpa.readyState Into Function?

Jan 28, 2011

I'm having a little bit of a problem with some ajax on my page.Below is the code in it's current state (with debugging info included):

function setrating(id)


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JQuery :: Calling An Anonymous Function?

Feb 3, 2011

I have a problem with understanding jQuery. In my case I have this JS file with following content (see below). This is an anonymous function, isn't it? The problem is this line:


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Getting Return Value From Post Anonymous Function

Jan 8, 2011

I have been struggling with a form wizard all day. I'm using jquery stepy (form wizard) along with validation plugin. To cut a long story short, my first step is to get MySQL connection from form controls details. On submit ('next' button) a check is made on an empty hidden control ('hid').

rules: {
hid: {
required: function(){
return checkDBData();
messages: {
{required: 'SQL not available'},

So, if the function checkDBData passes, false should be returned, so that the form can progress to the next step. If the connection details fail, true is returned so that an error msg is posted.

Here's the checkDBData function:
function checkDBData(){
var host = $('#mysql_host').val();
var username = $('#username').val();
var password = $('#password').val();
var dbname = $('#dbname').val();

{"host": host,"username": username, "password": password, "dbname": dbname},
if(msg.required == false){
return false;
return true;

The return values don't find their way back to the rules. However, if I hard code false and true to the function...
function checkDBData(){
var host = $('#mysql_host').val();
var username = $('#username').val();
var password = $('#password').val();
var dbname = $('#dbname').val();

{"host": host,"username": username, "password": password, "dbname": dbname},
if(msg.required == false){
return false;
return true;
return false; //or return true for testing purposes
This works. I assume it's due to the asynchronous nature of the ajax call.

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Creating Anonymous Function With Variable?

Mar 20, 2010

I'm having trouble with something that I can't explain outside of an example. Code:

$js_info_tabs = json_encode($valid_array);
$script = <<<JAVASCRIPT
<script type="text/javascript">//<![CDATA[
function changeTo(id) {


I have the code this way in order to consolidate it since I would prefer to do that instead of checking the selected ID and manually checking against all possible IDs (which works flawlessly, it just takes up about 5x the lines and is not modular). What I have above also works, but there is one fatal flaw:

It seems like the anonymous function that is the onclick for each unselected element becomes "return changeTo(tab + '_id')", but I don't want it to be that. I want the argument to actually be what tab is instead of the variable.

What ends up happening is that after changeTo() is called for the first time, any element you click will result in the last element being the selected one, as if it's using the final value of tab as its return value.

This doesn't make any sense, though, since tab is local, and deleting it before the function exists doesn't work. Deleting elem at the end of the for loop doesn't work. I honestly don't understand what's going on or why it doesn't set the new onclick value correctly.

Basically I just want changeTo(tab + '_id'); to turn into changeTo('MYID_id'); instead, but it simply doesn't do that and I can't figure out a way how.

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Giving AddEventListerner An Anonymous Function?

Nov 3, 2011

var name = "good";
load_image( name );
function load_image( name )


I've tried giving addEventListerner an anonymous function

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Passing Anonymous Function From SetTimeout() - IE Doesn't Like - FF Does

Jun 6, 2009

I did search the forums but couldn't seem to find anything on this specifically. I basically need to pass a key event and a 'name' to nameCheck() after 3 seconds. This works fine in Firefox but Internet Explorer gives the error: Member not found. I'm more of a PHP guy than a JS one

<input type="text" onkeyup="nameCheckTimer(this.value, event)" value="" />
function nameCheckTimer(name, evt) {
setTimeout(function(){return nameCheck(name,evt)}, 3000);
function nameCheck(name, evt) {
//need name and the key event to be available here. I have code to handle the key codes which works fine

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Passing 'this' To Anonymous Function In Event Listener

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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JQuery :: Pass Reference To An Object To Anonymous Function?

Aug 2, 2010

I would like to know how to pass in a reference of this to anonymous function so I can access parameters from anonymous. Here is my code:


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When Closures, Loops, Function References, And Anonymous Functions Interact

Oct 16, 2010

I am confused about the true difference between the two below examples.

first example:

// Demonstrating a problem with closures and loops
var myArray = [“Apple”, “Car”, “Tree”, “Castle”];
var closureArray = new Array();


Here we iterate through the length of myArray, assigning the current index of myArray to theItem variable. We declare closureArray 4 times as an anonymous function. The anonymous function in turn declares the predefined write() function, which is passed parameters. Since write() is in closureArray() a closure is created??? During each iteration, theItem is reassigned its value. The four closures reference this value. Since they reference this same value and since this value is reassigned ultimately to the value of the fourth index position, tHe time we execute closureArray later on, all four closures output the same string. This is because all four closures are within the same scope "the same environment" and therefore are referencing the same local variable, which has changed.

I have a couple of problems with this example:

1) I thought a closure is a function that is returned - the inner function is not returned above.

2) theItem is not even a local variable of the parent function (closureArray) - I thought in order for a closure to work, the inner function only accesses the local variables of the outer function, but in this case the local variable is defined OUTSIDE of the parent function.

3) the "the four closures are sharing the same environment." The thing is even in the second example, they are sharing the same environment.

Second example:

// A correct use of closures within loops
var myArray = [“Apple”, “Car”, “Tree”, “Castle”];
var closureArray = new Array();


Here we iterate over the length of myArray (4 times), assigning the index of myArray to theItem variable. We also return a function reference to the closureArray during each iteration (closureArray[i]), where i is index number so we assign 4 functon references. So when we iterate through myArray, we immediatelly call the writeItem() fucntion passing an argument of theItem at its current value. This returns a child anonymous function and when that child function is called, it will execute a block that calls the predefined write() method. We assign that returned anonymous function to the variable closureArray. Hence, closureArray holds a reference to that anonymous function. So closureArray during each iteration holds a reference to the anonymous function and we later call closureArray, which in turn calls the anonymous function, therefore calling the predefined write() function to output the local variable of the parent function. This outputs each distinct index of myArray.

This is because since we created the closure, when we call writeItem, passing theItem argument, since theItem is a local variable of the parent function of the closure, it is never destroyed when we later call closureArray (the reference to the child anonymous function)? Yet weren't we using a closure in the first example as well? So whey wasn't those variables preserved?

I don't think it has anything to do with assigning a returned anonymous function to closureArray. Even though an anonymous function creates a new memory position in the javascript engine, therefore not overwriting the other function references we create during the iteration, it's still referring to a local variable declared outside the reference. So if it's about the closure retaining value of parent's local variable even after exiting the parent function allowing for the current indexes to be preserved, then why did the closure in the first example fail to retain each index?

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Create An Anonymous Function For Onchange Event Of File Field?

Feb 28, 2010

I am trying to create an anonymous function for onchange event of file field, so that when a file is selected, the covering text field gets that value. I know how to accomplish this by adding onchange="", but I'd prefer not do that. The code that I have almost works, except that the function in the for loop can't call on the "i" variable that the loop uses.

for( i = 0; i < source.length; i++) {
source[i].onchange = function() {
name[i].value = this.value;

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JQuery :: Related To Setting Global Variables From Anonymous Function (valid = False;)?

Oct 22, 2010

//<input type="text" id="s_field" value=""/>
var valid = true;
var div = $("#s_field");
$.post("index.php",{id: 6}, function (data){


When posting data, and getting response need to set valid to false - email is not valid.

1. in function it alerts valid is false
2. outside function it says valid is still true!

even i didn't wrote var valid = false;, but valid = false;I need to set Global "valid" variable to false.

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Accessing Class Member Using This Inside An Anonymous Function Call In A Class Method?

Mar 28, 2010

I'm using jquery to make it easy for AJAX calls.

So I create a class: function cMap(mapID){//vars and stuff}

I go and prototype a function: cMap.prototype.loadMap = function(){ //jquery AJAX call }

Now in the jquery $.ajax({...}); call, I use an anonymous function on the "success:" call: success: function(data){ this.member = data; }

My problem is that inside this anonymous function call I'm trying to call a class member of my cMap class to store the data in from the AJAX call, but it's out of scope. So the JS console in FF/Chrome throws errors about bad value/doesn't exist.

How can I access this class member from inside an anonymous function? Or at least what's a good way to go about doing all this?

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Function Calling Function Returning False

Jun 7, 2010

I am trying to write a function that is being invoked when some one clicks the submit button on the form.<form name="sectionA" action="optionpage.cfm" onSubmit="return abc()">I have three tables with initials textboxes. I want to check if they are empty and return false(stay on the same page), else go to action page.Here is what I am doing, I Created three functions tableA(), tableB(),tableC() call them from function abc(). These functions tableA(), tableB(), tableC() return false if one of the field is empty and stop furthur processing and remain in the same page. If none(errors), then go the other page.i.e if table B has empty fields, page should stop furthur processing and remain in the same page.Here is how I am doing it Can somebody please point out what I am doing wrong here.Even when there is empty field, the code moves me to the actionPage.

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Function Not Returning Value / What To Do?

Mar 27, 2009

The following code is supposed to return a variable containing text, currently the code posts the data but returns an "undefined" variable. Can someone tell me what's wrong? code...

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Returning Value Outside Of Function?

Mar 27, 2009

I would like to document.write the status value using the return function but I can't get it to work.

The output should be Markers On or Markers Off.

<script type="text/javascript">


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Function Returning Wrong Value / Why Is So?

Feb 18, 2009

Why is my function returning the wrong value??

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Why Is Function Returning False?

Aug 13, 2011

So for whatever reason the convertToArray function in the following code returns false if the argument is more than 1 character long. If it's 1 character long it just returns the character as an array with only one value.What I'm trying to do is take a string of numbers, plus signs, and minus signs and convert it to an array.

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How To Get DWR ReadyState

Jul 19, 2011

how to get DWR readyState as in AJAX. I am using Springs.

Problem for me is sometimes the Flow continues even before Ajax values being returned and hence ends up in some error. If I can get the readyState, then i can check whether it is 4, so that I can make the flow to continue further.

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Returning Form Field Name From Function

Nov 3, 2005

I have a little problem in one of my functions, I would like to pass in a form field name and set the value to something that is passed in. here is my code:

function pickitem(id,type){
opener.document.getElementById("form").type.value = id;

so i'm passing in an id and a formfield e.g. txtName The problem is with the type.value - i haven't touched javascript for ages so i'm really rusty!!

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Ajax :: Returning A Value Directly From A Function?

Dec 1, 2009

I'm attempting to simplify my javascript code when it comes to ajax, but afterwords it only prints 'undefined' to the screen rather than what I want it to print.

I want to be able to put something like this on my main page onclick="document.getElementById('output').innerHTML = print_output();" where print_output() is the ajax function. This way I don't have to use a function to assign values directly to innerHTML and I don't have to muck about with a js file whenever I want to change my page layout.

To do this, I created a recursive function:

function print_output(return_value) {

if a value has been passed to the function, simply return it
if(return_value || return_value == 0) {
return return_value;


but like I said, it prints 'undefined' out to the screen. Why isn't this printing the contents that it receives from 'index.php' like it's supposed to?

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Returning Variable From Within Nested Function

Mar 9, 2009

The code is below but basically I have two global variables, then I have a function and then a function within that, I am simply trying to update these global variables from within the nested function so i can then go on and use them in another function! this sounds like quite a straight forward request to me, but maybe it can not be done? When I do an alert on the variables (after I have apparently updated their values) I get 'undefined'!

Code JavaScript:
var resultLatB;
var resultLngB;
function getLatLngFromTown(town, callbackFunction) {
var localSearchB = new GlocalSearch();
function() {
if (localSearchB.results[0]){
resultLatB = localSearchB.results[0].lat;
resultLngB = localSearchB.results[0].lng;
pointA = resultLatB;
pointB = resultLngB;

alert("Test 1 = " + resultLatB);
alert("Test 1 = " + resultLngB);
localSearchB.execute(town + ", UK");
alert("Test 2 = " + resultLatB);
alert("Test 2 = " + resultLngB);

alert("Test 3 = " + resultLatB);
alert("Test 3 = " + resultLngB);

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GetElement Function Returning Undefined Value

Sep 26, 2009

Here is a clip of code from a script project im working on. Now my document.getElementsByTagName is returning a "undefined" value.

<a href="[URL]" style="text-decoration: none; color: #EDDBAF; font-size: 16px;">
<center style="margin-left: 10px; margin-right: 10px;">
<font style="color: #EDDBAF; font-size: 16px;" id="title"></font>
<li id="name"><a http="[URL]" style="color: blue;">John Doe</a></li>
<script type="text/javascript">
var pname = document.getElementById('name').getElementsByTagName('a');

Now if I remove the ".getElementsByTagName('a')" it will actually work, but it also includes the <a> tag thats within the <li> tag, which I don't want.

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JQuery :: Returning A Value From A Success Callback Function?

Jun 3, 2010

I know this is a simple question with a simple answer, but I can't seem to wrap my brain around it.Sorry for the infantile nature of this post. Anyhow, I am making an AJAX call via JQuery and need the function to return a value from a calling function, like so:


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JQuery :: Width Function Returning Zero On Occasion?

May 26, 2010

I have a weird bug that's occuring in pretty much all the browsers. If I close the tab, and then hit Ctrl -> Shift -> T to bring it back the width() method returns 0 on an appended image instead of what the image actually is. Hitting refresh on the tab removes this bug and everything works fine. I will also say that trying
.css('width') and
Both also return 0 for this bug.

I can't show all the code for security reasons, but I'll just outright ask.. what are the reasons that width() would return 0 on an image? I've checked to make sure that it was visible (both display and visibility properties), and I checked the length of the property to ensure it was there. I just can't figure out why width() is returning 0.

Here's a code snippet:
$(this).append('<img src="'+defaults["imagePath"]+defaults["imageLeft"]+'" alt="" id="'+defaults["imageClass"]+'Left" class="'+defaults["imageClass"]+'" style="" />');
alert('Length: '+$('#divShadowLeft').length+' | Width: '+$('#divShadowLeft').width()+' | Visible: '+$('#divShadowLeft').css('visibility'));

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