function to fire only once in Pageload

melvik · #1 (**permalink**) October 5th, 2009, 05:55 AM

hello there
I have a function like below

Code:

        
function InisialText() 
{
            document.getElementById('TBoxEmpCnt').value = 0;
}

& I only what this to fire only once in pageLoad as I set it in

Code:

<body onload="InisialText();">

but since its in an ASP.NET 2 page it fires again & again in any button click (ASP.NET Buttons)

I can handle it with ASP in Code Behind Page
but there anyway to handle it with JavaScript? like a global valiable & set it to falae & ....
its a long time I havent worked with JS

Tnx in advance

joefawcett · #2 (**permalink**) October 5th, 2009, 09:29 AM

If you initiate a server-side event then the page will be fetched anew from the server. You could use a cookie to set the fact that the function had been called already or use the server-side onload function to set a client-side variable appropriately only if it wasn't a postback.

chroniclemaster1 · #3 (**permalink**) October 5th, 2009, 03:01 PM

Correct me if I'm wrong, but it sounds like you're trying to persist data in the text box so that users don't have to retype information if they click a button that triggers a post back or if they accidentally wander off the page etc.

In this case, is it necessary to set the text box to anything? I would suggest that an empty textbox is the best way to go. If you're setting it to 0 because the information is going into a DB field that doesn't allow nulls (a very good practice), I suggest allowing people to leave it blank and handle the problem when they submit the form. Rather than setting the textbox to 0 (which someone might delete anyway, causing validation problems) simply purify any response the user sends back. Check to see if text value of a field includes anything unacceptable and replace it with the default value you want, like swapping "" for "0" or whatever. But I think you'll have fewer problems handling this with validation than on the front end.

melvik · #4 (**permalink**) October 6th, 2009, 01:49 PM

Dear Joe & Chroniclemaster1:
tnx for ur comments, Im done my problem using a hidden html input (textbox) & making it a serverSide so I had access both side easily.
the rest is like what Chroniclemaster1 said
& Joe u were right about page roloading & ... so it was supied to do it only in JavaScript

Tnx again for ur help & time

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