How can I apply not empty validation on text boxes in ASP.NET

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Hi everyone
i am new to jquery and i want to implement a global jquery or javascript function that check whether the text box is empty or not...

What I have tried:

My aspx code is
How can i use jquery or javascript to validate this textbox

ASP.NET

<asp:TextBox ID="txt_Cat_Name" onKeyUp="CheckTextLength(this,15)" onChange="CheckTextLength(this,15)" onkeypress="return isAlfa(event)" runat="server" CssClass="Text"></asp:TextBox>

Posted 21-Dec-16 20:26pm

Muhammd Aamir

Updated 21-Dec-16 21:06pm

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Peter Leow · Answer 1 · 2016-12-21T21:06:00

Solution 1

By writing the script to handle the event, one example will be:

<script>
function CheckTextLength(element, minLength){

	if(element.value.length < minLength){
    	alert("Too short!");
        return false;
    }
}
</script>

and your asp.net control:

ASP.NET

<asp:TextBox ID="txt_Cat_Name" onChange="CheckTextLength(this,15)"  runat="server" CssClass="Text"></asp:TextBox>

Posted 21-Dec-16 21:06pm

Peter Leow

Comments

Muhammd Aamir 22-Dec-16 3:28am

Peter Leow i am asking about empty text box not about the length of text box kindly help me

Peter Leow 22-Dec-16 3:34am

Then what is the meaning of the 15 in here:
onChange="CheckTextLength(this,15)"
I already show you an example script, can't you try to understand and figure it out yourself. No effort no gain.

Muhammd Aamir 22-Dec-16 4:06am

Ok thankx i understand now ....