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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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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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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Sep 9, 2005
Is there a way to determine the object that a property is in? For
example:
function MyClass() { ... }
MyClass.prototype.myFunc = function() { ... }
var obj = new MyClass();
var sameobj = SOMEFUNCTION(obj.myFunc);
So my goal is to get a reference to the object by just having the
property.
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Nov 3, 2007
<div style="display:none;width:250px;margin-left:-250px;position:absolute;background-color:#f1f1f1;" id="container">
<div id="myframe" style="filter: alpha(opacity=0); z-index:10; height: 100%; overflow: hidden; width: 250px;position: absolute;">
<iframe id="'eliframe'" style="z-index:10; width: 250px;" frameborder="0"></iframe>
</div>
<div id="overlay12" style="position: absolute;z-index:18;width:250px;border:1px solid #005cb1;position:absolute;background-color:#f1f1f1;">
-[CONTENT]-
</div>
<script type="text/javascript">
var divh = document.getElementById("container").offsetHeight;
alert(divh);
</script>
</div>
So I need the height of the iframe to reflect the height of the div. The Div height is based on the amount of content that is inserted into it on page load (so I can't set an absolute height). The iframe is to allow the help popup to tile over dropdown menus in IE.
The script above doesn't return the height of the #container element. I need it to figure out the height on page load, and I can't seem to do it for the life of me.
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Jul 20, 2005
how can i check if file exist in current directory (in javascript)?
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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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Oct 27, 2009
how can i check if a DIV with the ID xyz exist?
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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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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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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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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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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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Mar 23, 2011
iframe Info: id="AssessmentsIFrame"button Info: id="wpv_1266351"
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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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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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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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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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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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May 9, 2011
I have a menu that I have constructed through HTML/CSS/JavaScript. Javascript handles the mouseover and mouseout events to set the background of the menu item/table element with an image. It works great. What my issue is right now is that when the user loads the Home page, I want that to have the background of the item already set. I had a function to do this with a switch clause in a separate javascript file. This function was called immediately (left it outside of any functions so it would execute first). But I'm getting an error because the actual element (a table) to set the background doesn't exist yet.
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Dec 6, 2011
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml">
[code]....
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Jul 23, 2005
I have a frame's onload event calling a function which needs to know
which file was loaded. Is there any java object/method to determine
the file name or any type of file id?
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Mar 30, 2006
I know it's possible to retrieve the IP address of a visitor's computer. However, I need to figure out a way to get the IP address of the server where the files are placed. Here's a description of my issue:
My application, along with some HTML Electronic manuals, are loaded onto a server in an electronic classroom. In order to get to any of these items (manuals or app), the students access the server where an index page is located in the D drive and click a link to get to any of them.
The problem is that these manuals are loaded into the D: drive while my application, because it uses ASP, is saved in the C:inetpubwwwroot folder.
The other issue is that this application will not be placed in just one classroom. Each classroom will have its own server with any number of computers accessing it. Since I don't know how each of the servers will be set up, I need to get the IP address so I can access the wwwroot folder.
What I need to do is figure out, using some non-server-side language, what the IP address or computer name of the server is so that I can access the appropriate folder in the wwwroot folder.
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Nov 23, 2009
This should be an easy one. I am using a single OnChange event with several <Select> statements, and need to identify the specific <Select> control that fired off the onchange event. I'm certain there must be a way to grab the ID or Name from the specific control in the javascript function, but I haven't been able to find it.
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Feb 11, 2006
is there a code for determining the resolution of the computer?
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Oct 14, 2011
My spidey senses are telling me this can't be done without making an additional [XMLHttp] request, but ... Any way to read the redirected URL for an image? Suppose I have the following tag:
HTML Code:
<img src='/images/test.jpg' />
And suppose the image request redirects to /images/test.jpg?token=123.
The image src, according to JavaScript is still /images/test.jpg. Any way to determine the new URL? (short of making an AJAX request for the image and reading the response header?)
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