Problem with ASP.NET control in javascript using clientid

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I am having a problem with my asp.net label control when trying to modify its content using javascript.

I am using

document.getElementById('<%= lblPayslipErr.ClientID %>')
to set the HTML content of the label.
I tried to set a static text in the label and alert it via javascript and it is working and being detected, however when I try to use .innerHTML to the label, console says variable lbl it is null.

This asp label control is in a row of a 2nd grid view inside another grid view control

What I have tried:

HTML

function uploadError(sender, args) {
alert(document.getElementById('<%= lblPayslipErr.ClientID %>').innerHTML); <%--This works, the label text is being prompted--%>

var lbl = document.getElementById('<%= lblPayslipErr.ClientID %>');

lbl.innerHTML = "Check file size or file extension.";  <%--I am setting the innerHTML of the label here but it does not work.--%>

Posted 27-Aug-20 23:25pm

bjay tiamsic

Updated 30-Aug-20 15:28pm

v3

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Sandeep Mewara · Answer 1 · 2020-08-28T00:09:00

Solution 1

I think - this should be your problem:

HTML

var lbl document.getElementById('<%= lblPayslipErr.ClientID %>');

You missed an equal operator here:

HTML

var lbl = document.getElementById('<%= lblPayslipErr.ClientID %>');

Try!

Posted 28-Aug-20 0:09am

Sandeep Mewara

Comments

bjay tiamsic 30-Aug-20 21:27pm

hello. it still does not work. I may have erased the equal sign whilst editing my post