Change hidden field Value in ASP.NET file and get the new value in javascript

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Hello

I have declared one hidden field in ASP.NET and initialize its value in code behind file during selection of grid row.
Then I have updated this hidden field in a javascript for that selected row.
Now when I moved to next row, the hidden value gets changed from code behind file. But in javascript file I am getting the same value which was updated for previous row.

C#:

C#

hdnPaxID.Value = string.Join(",", lstCabins.Select(n => n.Passenger));

Javascript:

JavaScript

var hdnFieldValue = document.getElementById('hdnPaxID').value;
//Some code to update hidden field.

Kindly suggest.
Thanks!

Posted 17-Mar-15 2:37am

Mayank Topiwala

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Thanks7872 17-Mar-15 10:10am

As you have not explained how you are processing different rows, its not clear what the issue is. Make sure that you are selecting data from the proper row.

Apply class to hiddenfields. And in javascript find that field using class, not Id.

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Sanjay K. Gupta · Answer 1 · 2015-03-17T03:08:00

Solution 1

Most probably, it may be UpdatePanel issue. Your hidden field may not get updated during selection of rows.

Posted 17-Mar-15 3:08am

Sanjay K. Gupta

Mayank Topiwala · Answer 2 · 2015-03-17T05:20:00

Hi Sanjay

I got the solution.
The hidden fields need to initialize at client side also i.e., in javascript. So after this code

hdnPaxID.Value = string.Join(",", lstCabins.Select(n => n.Passenger));

I've called javascript function which will update hiddenfield value

C#

function setHiddenFieldValue(hdnPaxID, hdnPaxValue)
{
    document.getElementById(hdnPaxID).value = hdnPaxValue;
}

So in my main javascript function, I can get these updated value.
Conclusion: If hiddenfield value to be use at client side then it needs to initialize at client side only.

I don't know how it happens but it works for me.