How should I send value of javascript function to textboxes in gridview.

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The content page has two Gridviews, gv_Purchase and gv_PurchaseDetails
On Page_Load, gv_Purchase is displaying data from tbl_Purchase table of SQL.
To get information in detail users have to select any particular row by clicking on corresponding link button ("Select").
gv_PurchaseDetails will be visible and will display the related data regarding selected row of previous Gridview (gv_Purchase) from tbl_PurchaseDetails table of SQL.
gv_PurchaseDetails has two template fields, Rate and Quantity. Users can change value from EditTemplate mode by clicking on link button (Edit).
When users enter value in txt_Rate and txt_Quantity, onkeyup event calls a function to display value (txt_Rate * txt_Quantity) in label_Amount of the row. After that users will/have to store data by clicking on link button (Update).

I am unable to execute point no.6. Please let me know how should I send value of JavaScript function to textboxes in gridview.

What I have tried:

JavaScript

function CalculationTotal() {
    var grid = document.getElementById("<%= gv_PurchaseDetails.ClientID%>");
    for (var i = 0; i < grid.rows.length - 1; i++) {
        var rate = $("input[id*=txt_Rate]");
        var qty = $("input[id*=txt_Quantity]");
        var totalamount = rate[i].value * qty[i].value;
                    
        $("input[id*=lbl_Amount]").html(totalamount.toString());
    }
}

Posted 6-May-20 8:50am

Member 14823087

Updated 7-May-20 3:58am

Richard Deeming

v3

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Richard Deeming · Answer 1 · 2020-05-07T03:58:00

Given the name, I'm assuming label_Amount (or is it lbl_Amount?) is an <asp:Label> control. That will render a <span>, not an <input>, so $("input[id*=lblAmount]") won't find anything.

You'll also need to scope your selectors to the table row you're processing, and skip the header and footer row(s).

Try:

JavaScript

function CalculationTotal() {
    var grid = document.getElementById("<%= gv_PurchaseDetails.ClientID %>");
    $(grid).find("tbody > tr").each(function(){
        var rate = $("input[id*=txt_Rate]", this);
        var qty = $("input[id*=txt_Quantity]", this);
        
        var totalAmount = rate.val() * qty.val();
        $("span[id*=lbl_Amount]", this).text(totalAmount.toString());
    });
}