Javascript to calculate data from TextBoxes and Labels.

by
  1. Input variables :
  • Quantity1 = TextBox2.Text
  • Quantity2 = Label1.Text
  • Quantity3 = Label2.Text

Output :

  • TextBox3.Text

2. Call in Textbox 

 <asp:TextBox ID="TextBox4" runat="server" AutoComplete="off" onclick="fillTextbox4()"></asp:TextBox>

3. Javascript Code run when page loads [ triggered at txt1 change ]

<script type="text/javascript">
    function fillTextbox4() {
        var txt1 = parseFloat(document.getElementById('<%= TextBox1.ClientID %>').value) || 0;
        var opn = parseFloat(document.getElementById('<%= Label3.ClientID %>').innerText) || 0;
        var total = txt1-opn ;

        // Set the sum in TextBox4
        document.getElementById('<%= TextBox4.ClientID %>').value = total;
    }
    window.onload = function () {
        document.getElementById('<%= TextBox1.ClientID %>').addEventListener("input", fillTextbox4);
    };
</script>

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