Span Tag Is Undefined But It Exists ?

Jan 20, 2011

I have a span tag which simply prints a number.

On my page I have a button that runs a script. After the script does some number crunching it's supposed to print the result in the span, but it never works. The span has an ID and I am sure it is unique (a number is appended during a loop).

This is the javascript:


If I uncomment the alert statement, it returns "undefined".

This is the implementation:

PHP Code:

The last line is the span in question. There are no PHP errors; everything prints and looks fine. I know the span exists because the initial value prints and has the proper styling applied to it (via the class).

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Jquery :: Username Validation(exists Or Not Exists In Database)?

Oct 17, 2011

I am working on a registration page.I did all the validation but facing problem during username validation.when a user enter email id in the textbox,it first check whether it is present in database or not.. if not present "register successfully" otherwise "email exists"


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JQuery :: Finding A Span Nested Inside Another Span?

Sep 13, 2011

If you have span within another span, jQuery selector seems to be unable to find it.example:



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JQuery :: Select Span With Span Parent?

Aug 31, 2009

How would I select all spans which have a span as a parent?

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JQuery :: Set Concrete Image Title In Images Collection With Concrete Span Value From Span Collection

Nov 26, 2010

I have this sites: index.html with this code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<script type="text/javascript" src=""></script>


what I need is set an image title with given index (1)withvalue of span with given index (1). I tried some laborations with gt(), index(), but there is no success.

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If The File Does Not Exists ??

Jul 23, 2005

<INPUT id = "bot1" TYPE="button" name="text1" value="" size="40" onClick="location.href= valore12" >

the onclick is opening a file. How can I tell javascript a message has to be seen if if there is not that file in the specified directory...

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How To Check If URL Exists

Aug 4, 2011

I have a textbox for entering URL. I validate that URL using regular expression. Now the problem is, How do i know whether the entered URL is exist or not.?For example, if user enter "" rather entering "", how do i intimate them that the entered url is not valid.?

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Check If A URL Actually Exists?

Feb 6, 2009

Using Javascript I need to figure out how to check if a URL actually exists. The problem is that the Javascript file may not always be there so I have I have to check every time I need it.

AJAX is not an option AND its has to cross browser compatible.

*NOTE The URL will always be pointing to a Javascript File


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Check If An Id Exists?

Sep 21, 2010

I'm trying the figure out how to check if a id exists.

I have tried this;


Then do this

But that doesn't seem to work.

All I want to do is if it doesn't exist then don't run the function.

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How To Verify Webpage Exists

Jul 23, 2005

I have the following script that auto-submits a form at intervals.


Unfortunately, sometimes the target webpage is not available and I get
"page not found". That immediately kills my application, until I manually
restart it.

Is there a way in javascript to first check if a link exists before the
form is submitted?

For php programmers, an example of what I want will be:

if(fopen("", "r") {
do something here...

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Oct 19, 2005

How can I check if a function exists in any of the scripts on my page?
I prefer if it can work for both Javascript & VBScript.

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Check If Object Exists?

Apr 13, 2006

How do I check if an object exists in Javascript?


if (document.getElementById("product").value == null)
prodValue = "";
prodValue = document.getElementById("product").value;

This gives me an 'object required' error...

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JQuery :: IF Id Exists Hide Other Id's

Jan 26, 2010

I am trying to write a script that will search the page for a certain ID...if said ID exists, then I want to hide a few other IDs.[code]

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JQuery :: Run Certain Script Unless If Div Exists?

Oct 14, 2011

I want toa script to run unlessa div with an ID of #error-box exists.

This is the script...


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Check Css Property Exists With JS?

Jul 2, 2011

I'm using ccs3PIE with my site. What I want to do is check if a DOM element has a css property like border-radius and then add a class to it.

The problem I'm having is that I don't know how to check for the css property. I've been searching for it for a couple of hours now and I can't find anything that seems to work.

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Check If A Select Value Exists?

Aug 31, 2009

I found out how you can check if an array value exists but I can't seem to get it to work with the options array for some reason.

how I can find out if a certain select value exists?

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Check If Plug-in Exists

Sep 7, 2009

I'm not entirely sure this is possible. I hope it is, and it doesn't seem to far-fetched or impossible.

With JS, how would one go about checking if a user has DivX Web Player installed?

Usually people put in code within the embed, so if it the player doesn't load, it would have the message behind stating the fact. However I haven't seen this used at all with DivX, instead, you see pop-up boxes, whether installed or not, stating "Don't have DivX Web Player? Get it here for windows or mac"

I find this extremely annoying, and would never want such informalities on my website.

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Check If An Element Exists?

Mar 30, 2010

If I have a form like so:

<input type="text" />


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Check If INPUT Value Exists?

Nov 26, 2010

One holds the form and the other the php Query process.Im using a small piece of javascript to POST the value to my php Query process scriptbut im finding it difficult to display a result by fading in a div based on the query response.For example if i type in a tag and the tag already exists i want the php to check the table and the return a faeIN div to say it "already exists" otherwise fadeIN a div to say "Tag inserted into database"But i also am using a little more JS to clear the input field value as well.All this is done without reloading the page.So basically if the tag "People" exists in the MYSQL table then i want the div #i2 to fade in and say "Already exists!"My code is below:The HTML

<form method="post">
<strong>Keyword: </strong> <input type="input" id="tag" name="tag"/> <input type="button" id="send"


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Determine If A DIV Exists With A Specified CSS Class Name

Nov 8, 2010

Using Javascript, how do I determine if there is a DIV with a particular CSS class name on the page? (Not an ID...) I'm writing a function to perform an action if it finds that DIV on the page.

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Check 'getElementById' ID Exists First?

Dec 17, 2005

In my page templates, which are included on every page, I have some javascript that is necessary to create some effects. However a couple of pages do not require the javascript, and because of this the page elements are not present. How would I add a check to ensure the element ID exists before running the javascript code? In other words, here's the code in question:

var thevar = document.getElementById("theid").getElementsByTagName("LI");
Is there a conditional that can be wrapped around that to prevent the javascript code from running if no elements named "theid" exist?

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Jan 29, 2006

I am having troubles finding a way to use JavaScript to see if a file exists before an ASP file upload script runs. Is there an Exists check for JavaScript? I thought I found an ObjectName.Exists but doing this did not work.

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Dec 4, 2006

In client side, we can check if some image exists using onerror. I wish the same behavior to check files used in object tag (in client cache, not in file system), like swf, wmv and wma, etc.

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Mar 17, 2002

I have a form, that depending on some conditions MAY have a certain drop down box in it.

I would like to have a javascript function that checks to see IF the drop down box exists? ie: Does the javascript object exist?

Sort of like this:

function resetMenu1(){
//Test to see if dropdown exists.
if exist( { = "Yes!";
} else {
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Anyone know how to do this? It's the "if exist" part I don't know how to do.

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If Element Exists - Run Script ?

Feb 2, 2010

I'm using this script to make some changes to a table which is only accessible via a class serverside:


The first part of the code is a script from Robert Nyman, [url] - my function is added at the end of the script. It works fine, but my page is dynamically generated and sometimes this element with the class name doesn't exist. This gives an error when the page is loaded: "getElementsByClassName("login-headline", "table")[0] is undefined". How can my function be rewritten so that it checks to see if the class is avaliable before running the script?

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Mar 5, 2010

I would like to check if a function exists before define it. Does this make sense:

<script language="JavaScript">
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