asp:TextBox and MaxLength

本文关键字：MaxLength and TextBox asp | 更新日期: 2023-09-27 18:30:46

我写了这个：

<asp:TextBox ID="txtSMSMessaggio" CssClass="inputForm" MaxLength="240" TextMode="MultiLine" runat="server"></asp:TextBox>

但是在客户端，我看不到属性maxlength（我需要）。为什么？我该如何解决它？

asp:TextBox and MaxLength

您可以使用<textarea>标签并添加runat="server"吗？

<textarea id="txtSMSMessaggio" class="inputForm" maxlength="240" runat="server"></textarea>
您可能

对计算文本框中的字符不感兴趣，但在达到限制之前让最终用户知道存在限制会很有帮助。你可以做这样的事情

<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 />

您可以尝试使用正则表达式将用户限制为 240 个字符：-

<asp:RegularExpressionValidator runat="server" ID="txtSMSMessaggio"
ControlToValidate="txtInput"
ValidationExpression="^['s'S]{0,240}$"
ErrorMessage="Some error message"
Display="Dynamic">*</asp:RegularExpressionValidator>
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