how to calculate sum three textbox without using buutton

Question

dear sir  how to calculate sum three textbox without using button the value put in three textbox the result show next textbox automatically using asp.net webform

Shubham Kumar · Answer

function fctSomme(){ var nb1 = parseInt(document.getElementById(txt1).value 10); var nb2 = parseInt(document.getElementById(txt2).value 10); var nb3 = parseInt(document.getElementById(txt3).value 10); var nb4 = nb1 + nb2 + nb3; document.getElementById(sommeTtl).value=nb4; } event in asp.net just replace the input box to asp:textbox

Nishant Mittal · Answer

Hi y dont u write your code on TextBox3_TextChanged event ....it will solve the issue use this Private Sub TextBox1_TextChanged ( ByVal sender As System . Object  ByVal e As System . EventArgs ) Handles TextBox1 . TextChanged  TextBox2 . TextChanged If String . IsNullOrEmpty ( TextBox1 . Text ) OrElse String . IsNullOrEmpty ( TextBox2 . Text ) Then Exit Sub If Not IsNumeric ( TextBox1 . Text ) OrElse Not IsNumeric ( TextBox2 . Text ) Then Exit Sub TextBox3 . Text = CDbl ( TextBox1 . Text ) + CDbl ( TextBox2 . Text ) End Sub