Check If Object Exist

Aug 23, 2007

Let's say that I have generated var SomeVariable = true; from server.
On client side I have:

if (SomeVariable == true) {
do something
}

How could I first check if my variable is undefined? Or how can I say if
some exception occures please don't report error, just continiue?
If variable is not generated from server, it will report me an error..

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JQuery :: Check If A DIV With ID Xyz Exist?

Oct 27, 2009

how can i check if a DIV with the ID xyz exist?

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JQuery :: Check That Certain Element Does Not Exist?

Mar 14, 2011

I am dynamically creating CheckBoxes DropDoenlist with certain set of values of not all of then are created any time.But in Script i want to get sure whether that element has been created or not. So how can i check for radio button list and dropdown list.Below is the code for my dynamic list creation:

sbp1+="<select id='locationOption' class='reg_select'>";
sbp1+="<option>Location one</option>";
sbp1+="<option>Location two</option>";

[code]....

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Check If Selected File Exist?

Jun 3, 2009

When i select a file (through html file control) from local machine, before uploading i want to check if the selected file exist(because,after selecting and before submitting the form,user may change the name/delete the file from the source). so after selecting the file, i need to check the same file exist as it is using javascript/ajax. Back end is JSP.Eg: Am selecting abc.jpg from my system and changing the file name form the source as abcd.jpg, now abc.jpg does not exist. But i want to check if exist. If selected file does not exist, i want to display a message before uploading/submitting the form.

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How To Check If Cell Exist In Table

Jun 22, 2010

var myarray=new Array(4)
for (i=3; i <7; i++) myarray[i]=new Array(8);
for (i=3;i<7;i++) {

[code]...

Here is my code and i want to check if the cell exist and if it is true to take the content of the cell. But it gives me an error in the 6 line(which i believe is wrong):

Message: Object doesn't support this property or method

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Check If File Exist In Server?

Feb 18, 2011

So I have an web application deployed on tomcat. That application is a document browser[URL] that renders some html pages. In one of those pages I will have a svg that will change some colors if some files are/are not deployed in the server. So I am trying to create a javascript function that open that file. The code I am using is this:

Code:
<script type="text/javascript">
var xmlhttp=false;
/*@cc_on @*/

[Code]....

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JQuery :: Check If A Text Already Exist In A Li Item?

Nov 29, 2011

I want to insert a new li item in a list only if this item no already exist. For example:

<ul id="myList">
<li>Item 1</li>
<li>Item 2</li>
</ul>

Available insert "Item 7" but not "Item 1" for example. I´m trying so crazy statements like this:

Opt 1)
var ListItems = $('#myList li').find('Something');
Opt 2)

[code]....

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Check Whether A Button (wpv_1266351) In An Iframe Exist?

Mar 23, 2011

iframe Info: id="AssessmentsIFrame"button Info: id="wpv_1266351"

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Determine If Object Exist

Jul 23, 2005

I have a script that will set the focus to a particular input box. I want the script to check to see if the input box exist also.

I'm receiving the following error:
'document.ScheduleForm.txtGrossPayroll99' is null or not an object.

The txtGrossPayroll99 is a field that does not exist. I've hard-coded
this name into the script to see if it is working correctly.
I'm using the OnLoad event inside the <Body> tag to execute this
function.

var formInUse = false;
function setFocus()
{
if ((!formInUse) && (typeof(document.ScheduleForm.txtGrossPayroll99) !=
"undefined") && (typeof(document.ScheduleForm.txtGrossPayroll99) !=
null) );{
document.ScheduleForm.txtGrossPayroll99.focus();
}}

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Checking If Span Object(s) Exist

Jul 20, 2005

We have a JSP website intended for viewing with IE 5 (and above)
On a certain jsp page, there are few span objects
(<SPAN ID="name">text</SPAN>), which are created dynamically.

The spans share the same ID, so we are able to reference them as an
array, in the javascript code :
for example:

<SPAN ID="wow">lala</SPAN>
<SPAN ID="wow")kaka</SPAN>

in the JS code:

wow[0].innerHTML = "fafa";
wow[1].innerHTML = "zaza";

It may occur, since these spans are created dynamically by the JSP
page, that on a certain instance of the page, no spans are created.

My question is - how do we know, in the JS code, that no spans of ID
'wow' exist?
We tried several ways:

if (!wow) alert('no wow'); // If there were no spans, this gives a
js error

tried a few other methods which i cant recall of now..
I know of a workaround - to add a 'dummy' span with the 'wow' ID , but
I prefer to know if there is a better way to deal with this.

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Check If Object Exists?

Apr 13, 2006

How do I check if an object exists in Javascript?

EG:

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

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

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Check Permissions Of An Object?

Feb 20, 2009

i have a website, that has a set of horizontal tabs across the top. each tab is linked to its own Iframes (for fast switching). The tabs onclick runs through EventArbitrator (custom function) that checks each frame and then sets the display:for then accordinginly. All works well.

Error: Permission denied to get property Window.IFrameEventHandler

Code:

if (notify) {
for (i=0; i<lngIFramesCount; i++) {
if (window.frames["frame_" + strIFrames[i]].IFrameEventHandler) //Line that has error
window.frames["frame_" + strIFrames[i]].IFrameEventHandler(type, args);

[code]....

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Way To Check Object Equality ?

Jun 20, 2011

I've been looking around on the internet search for the right way to check for object equality, but I couldn't really find an answer that I could be sure of to be correct.

I made a vector "class", where mixed types of data can easily be stored in an array. I want to add an equals method to the vector. What is the correct way to check if two objects are equal? Where equal means that both objects hold the same data?

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JQuery :: Check Each Property Of An Object?

Apr 20, 2011

i am locking for something to get all Propertie`s of an Object (with an each loop?)

<div id="blub" class="blah" name="blah"></div>
<script>
$('div').attr(function(){

[code]....

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JQuery :: How To Check Is The Object With The Css Property?

Oct 16, 2009

[Code]...

How to know the div have position property or not?

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JQuery :: Check Length Is Null Or Not An Object?

Sep 26, 2009

The function below results in this error and I'm not sure how to correct it? The initial value of the field is 0.00, but it doesn't look like it's relevant... That is, even when the value isn't 0, it still results in this error.

if($("input[name='b2h']")) {
$("input[name='b1']").bind("keyup", b2);
b2();

[code]....

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JQuery :: Check If The State Of The Object That Have Used The SlideToggl?

Apr 15, 2011

How do i check if the state of the object that i have used the SlideToggle

i need to add different calculations depending on if the object is visible or not.

like

if (div = visible)
do something
slidetoggle the div
else
do something else
slidetoggle the div

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Oct 16, 2009

How do I check upon clicking a random object on the page that the object onmousedown is an image or not?

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If File Exist

Jul 20, 2005

how can i check if file exist in current directory (in javascript)?

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Scripts Don't Want To Co-exist?

Aug 21, 2011

I am trying to run 2 different scripts on a page, both of them work fine independently, however, when both of them are running, one of them refuses to work.

This is the page: [URL]...this is what the client wants!!) The menu on the left is supposed to have a flyout element, but that doesn't work when the falling leaves are working.

This is the menu script:
startList = function() {
if (document.all&&document.getElementById) {
navRoot = document.getElementById("nav");
for (i=0; i<navRoot.childNodes.length; i++) {

[Code]...

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JQuery :: Add Select Options Only If Option Doesn't Already Exist

Jul 22, 2010

I have two multiple selects on my page. One gets updated via ajax whenever the user filters data (we'll call that select "#select-1"), when they select options from that it then gets moved into the other select (we'll call that "#select-2"). That is all working fine but I'd like to refine it so that they can't select the same data twice.

So, basically, what I'd like to do is add logic within the ajax call to only update the select options in (#select-1) if it does NOT exist in the other select (#select-2).

I have no clue where to even begin with this....do I need to store the val's in an array and then search for each one in the other?

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JQuery :: Expand The Width Of A Div If Another Div Doesnt Exist On The Page?

Nov 3, 2011

I have a page with two divs on it, <div id="left"> and <div id="right"> . On my page, there are times when the right div is not displayed as there is no content in it, how can I get jquery to detect that div id="right" does not exist on a page so make the width of the left div to 1200px.

This is what ive found, but im not sure length is what I should be using to calculate if a div exists or not:

[Code]...

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JQuery :: Figuring Out - Use A Conditional Statement If Children Exist?

Jun 18, 2010

So I'm new to jQuery and loving it! I just got stuck on a problem that I'm not sure how to work around. I'm trying to add a class to a li item in a navigation if it has child list items underneath it. For example,if I have this situation:

[Code]...

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Verify That The Data In My Form In HTML Is Already Exist In My Database

Nov 23, 2011

I want to verify that the data in my form in HTML is already exist in my database if this is true then the form must not be sent. I know this is done in javascript but I can not found the right solution. I would like an illustrative example.

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JQuery :: Binding Events To Dynamically Created Elements That Do Don't Exist At All On Page Load

Jul 26, 2010

In the examples for live() and delegate(), the selectors match at least one element that already exists. Will either of these commands work on elements for which there is no match at all on page load?

In my case, I want to bind a keyup event to the textareas that jeditable creates. I could probably create custom plug-in (to the plug-in :) to do the job, but I'd like to use live or delegate if they would work.

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How To Check The Input File Object File Size On Client Side?

Dec 20, 2004

I have a form with three Input File form objects in which the user can add image files. But I am worried about the problems these controls can lead, because to check the file size the server needs to receive the entire file, so serious problems may happen, for example:

1. Malicious user trying to collapse the website sending big files.

2. Users that have not seen the warning “Maximum size: 100 KB&#65533; for each image, and try to send three image files consisting in 1,5 MB each one. These users will have a bad experience waiting one hour or more to upload the images, and after that receive an alert saying “Oooops! Your image files are too big.&#65533; And also, web server will waste an important amount of resources. The same case with 100 users at the same time can be a nightmare!


I have been searching a way to check the file size on client side without having to force user to install anything, but I think that there isn’ t nothing to do with javascript. But I found an interesting PHP article that explains a way to do it with this server side language. The technique consists in:

“A hidden field (measured in bytes) that precede the file input field, and its value is the maximum filesize accepted. This is an advisory to the browser, PHP also checks it. This form element should always be used as it saves users the trouble of waiting for a big file being transferred only to find that it was too big and the transfer failed. Code:

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