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Javascript validation

Posted By:      Posted Date: October 15, 2010    Points: 0   Category :ASP.Net

Hi there I m confused about how to validate data at time editing data with gridview, I converted all fields of gridview into template so in code it can be seen textboxes as TextBox1,TextBox2.....now i attached  javascript function with update button. right now I am having error so please have a look at code and reply javascript code to access textbox in gridview in editmode

 function validateData(TextBox2) {
        var sta = false;
            var gridViewID = "<%=GridView_courses.ClientID %>";
        var gridView = document.getElementById(gridViewID);
        var gridViewControls = gridView.getElementsByTagName("TextBox");

        for ( i = 0; i <= gridViewControls.length - 1; i++)

           if (gridViewControls[i].type == "text") {
                if (gridViewControls[i].value == " " || gridViewControls[i].value == null) {

                    sta = true;
                    alert("Error in input");

                if (sta == true) {
                    alert('Quantity must be greater than 0');
                    return false;
                else {

                    return true;



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