How to add autopostback to gridview using javascript

See more:

ASP.NET

Javascript

I have two textbox in the form one is for patientid then another one is for Amount and also i have one gridview. That gridview contains 3 columns: first column is Checkbox,second column is TestName,third column is amount...

Now i booking the new patient by following steps:

1.Enter patient id in the first textbox
2.Which test need to take we should check the checkbox in that gridview. when i check the checkbox it will display the corresponding test amount in that another textbox.
if i check another checkbox in that gridview the amount add like existing checked test amount + newly checked test amount. It is the process in this form...

i used jquery with javascript to checking the checkbox...

now it is working fine... but when i need to update the existing patient its not working

Help me..