根据从下拉列表中选择的项目,将最小值和最大设置为文本框



是否有从客户端更改文本框和最大长度并验证rangeValidator的方法,具体取决于从下拉列表中选择的项目?假设我从下拉列表中选择第一个元素,文本框min和最大值必须为2和4,以及最大长度4。我正在考虑使用RangeValidator和OnChange事件?任何解决方案/建议以实施此操作?

编辑:这样的东西?

<asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList>
<asp:TextBox ID="TextBox1" MaxLength="4" runat="server"></asp:TextBox>
<asp:RangeValidator ID="RangeValidator1" runat="server"
ControlToValidate="TextBox1" ErrorMessage="Insert correct value."
MinimumValue="2" MaximumValue="4" Type="Integer"></asp:CompareValidator>
'CodeBehind
Populated dropdownlist.
DropDownList1.Attributes.Add("OnChange", "ChangeRangeValidatorValues();")
'Javascript function
        function indexChanged()
        {
            var textbox=document.getElementById('<%=TextBox1.ClientID%>');
            var droplist=document.getElementById('<%=DropDownList1.ClientID%>');
            var rangevalidator=document.getElementById('<%=RangeValidator1.ClientID%>');
        if (droplist.selectedIndex == 0)
        {
            textbox.maxLength=5;
            rangevalidator.minimumvalue=<%=ConfigurationManager.AppSettings["someValue"] %>;
            rangevalidator.maximumvalue=rangevalidator.minimumvalue;
        }else if (ddl.selectedIndex == 1){
            ..
        }else if (ddl.selectedIndex == 2) {
            ..
        }
    }

如果您使用的是C#ASP.NET,请使用此。如果有任何帮助评论,并且答案有用,请给其他答案打勾以寻求帮助。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
      <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
   <script type="text/javascript">
       $(document).ready(function () {
           $('#DropDownList1').on('change', function () {
               var responseId = $(this).val();
               alert(responseId);
           $("#TextBox1").attr('maxlength', $(this).val());
       });
       });
   </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="DropDownList1" runat="server">
        <asp:ListItem Text="2" Value="2" />
         <asp:ListItem Text="4" Value="4" />
        </asp:DropDownList>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    </div>

    </form>
</body>
</html>

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