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Validating textboxes in red square borders.

sammySeltzer asked
Last Modified: 2017-03-25
Hi experts.

I am able to validate textboxes within gridview control with the following script:
<script type="text/javascript">
function ValidateEmptyValue() { 
    var gv = document.getElementById("<%= Gridview1.ClientID %>"); 
    var tb = gv.getElementsByTagName("input"); 
    for (var i = 0; i < tb.length; i++) { 
        if (tb[i].type == "text") { 
            if (tb[i].value < 1) { 
                 alert("Field cannot be blank!");
                return false; 
    return true; 

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However, my manager wants me to use red square borders around each textbox instead of an alert.

How do I modify the script above to do just that?
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