I wrote this:
<asp:TextBox ID="txtSMSMessaggio" CssClass="inputForm" MaxLength="240" TextMode="MultiLine" runat="server"></asp:TextBox> but on client side I can't see the attribute maxlength (which I need). Why? And how can I fix it?
- 1edit: I see what you mean, vote revoked!CodingIntrigue– CodingIntrigue2013-09-10 14:54:26 +00:00Commented Sep 10, 2013 at 14:54
- @RGraham: no that's another kind of question. I want that attributes appair on client.markzzz– markzzz2013-09-10 14:55:23 +00:00Commented Sep 10, 2013 at 14:55
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3 Answers
Can you just use a <textarea> tag and add runat="server"?
<textarea id="txtSMSMessaggio" class="inputForm" maxlength="240" runat="server"></textarea> 3 Comments
markzzz
No, because I can't use that textarea as controls in the .cs. Such as txtSMSMessaggio.Text
CodingIntrigue
Declaring a
<textarea> with a runat=server attribute will give you access to a HtmlTextArea in the code-behind. Not a 1-to-1 map, but still gives you access to the control.CodingIntrigue
You need to use txtSMSMessaggio.Value instead
you might not be interested in counting the characters in the TextBox, but its helpful to let the end user know there is a limit before it is reached. you can do something like
<script language="javascript" type="text/javascript"> var Maxlength = 240; function taLimit() { var srcObject = event.srcElement; if (srcObject.value.length == Maxlength * 1) return false; } function taCount(tagName) { var srcObject = event.srcElement; if (srcObject.value.length > Maxlength * 1) srcObject.value = srcObject.value.substring(0, Maxlength * 1); if (tagName) visCnt.innerText = Maxlength - srcObject.value.length; } </script> <asp:TextBox ID="txtSMSMessaggio" CssClass="inputForm" TextMode ="MultiLine" runat="server" onkeypress="return taLimit()" onkeyup="return taCount(Counter)" onfocus="return taCount(Counter)" ></asp:TextBox><br /> (<span id="Counter">240</span> characters left)<br /> 
Comments
You can try a Regular Expression to restrict the user to 240 characters:-
<asp:RegularExpressionValidator runat="server" ID="txtSMSMessaggio" ControlToValidate="txtInput" ValidationExpression="^[\s\S]{0,240}$" ErrorMessage="Some error message" Display="Dynamic">*</asp:RegularExpressionValidator> 