How to get value from textbox before postback and use it with gridview on the same page?

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I have a two text-boxes(Tb1-Adults, Tb2- Child) and a gridview on a page. The footer of gridview has "total amount" textbox in it which takes "PricePerPerson" value from database and calculates total amount using given above textboxes. How to do that without submitting the page(Without postback)?

What I have tried:

I've tried textchanged event of textbox event but, I'm unable to get value of textbox to gridview before postback.

Posted 22-Jul-17 1:59am

sam_matte

Updated 22-Jul-17 3:19am

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Atlapure Ambrish · Accepted Answer · 2017-07-22T03:19:00

Check the id & loop in javascript
Eg:

var i = 2;
var txt;
while(1)
{
txt =document.getElementById('GridView1_ctl0' + i.toString() + '_textboxid');
if(txt!=null)
{
// process your textbox
}
else
{
break; // all rows completed
}
}

Confirm your control ids by inspecting the controls in developer tools in browser and use them in above script.

In above script textboxid is your textbox rendered in footer of the grid.