You are having from values in TextArea that is why its not going inside of If condition
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function formValidate() {
var comt = document.getElementById('commentBox');
var flag = 0;
if (comt.value.length == 0) {
comt.setAttribute('style', 'border: dashed 1px #FF0000;width:490px;height:100px');
flag = 1;
}
else {
comt.setAttribute('style', 'border: solid 1px #cbcbcb;width:490px;height:100px');
}
if (flag != 1) {
return true;
}
else {
return false;
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div class="facebookcomments">
<div style="float: left; width: 500px">
<textarea id="commentBox" name="commentBox" rows="5" cols="10" ><%= Value%></textarea>
</div>
<div>
<div style="float: left; width: 300px; padding: 10px 0;">
<asp:Button ID="btnComment" runat="server" Text="Comment" OnClientClick="javascript: return formValidate();return false;"
BackColor="#b4d33f" OnClick="btnComment_Click" />
</div>
</div>
</div>
</form>
</body>
</html>
Image: When Text area is null
Set Value property = string.Empty
protected string Value { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
Value = string.Empty; ;
}
