Question

I have an aspx page that contains a user control. The user control has a textbox and the page has a submit button.

How can I check if the textbox in the user control is not null and display an alert if it is – from the page?

Answer 1

You can easily handle it using jquery. Just handle the onclick javascript event of the input button:

$('#yourBtn').click(function(event) 
{        
    if($("#yourTxtbox").val().length > 0) 
    { 
        //do something

    } 
    else
    {
       alert("empty textbox");            
       event.preventDefault(); //prevent button click
    } 

});