Is it possible to restrict a multiline asp:TextBox to only display content on 3 lines using either javascript or C#?
Is it possible to restrict a multiline asp:TextBox to only display content on 3 lines using either javascript or C#?
To achieve this, simply set the Rows property to 3 in the following manner:
<asp:TextBox ID="txtBox1" runat="server" Rows="3" TextMode="MultiLine"></asp:TextBox>
If you prefer using JavaScript:
function validate(e, max, maxchar)
{
var text = e.value.replace(/\s+$/g,""); var split = text.split("\n");
if (split.length <= max && text.length <=maxchar)
{
return true;
}
else if (split.length >= max || e.value.length >=maxchar)
{
return false;
}
}
<asp:TextBox ID="txtBox1" runat="server" TextMode="MultiLine" Rows="3" onkeypress="return validate(this, max_number, maxchar_number)"/>
Customize the values of max_number and maxchar_number according to your needs.
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