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有没有跨浏览器的方式在expando属性上使用jQuery选择器?

expando jquery-selectors jquery asp.net

NightOwl888 Jabrwoky · 技术社区 · 14 年前

我有一个ASP.NETpage和我正在尝试使用jQuery选择器快速匹配绑定到特定文本框(文本输入)的验证控件。验证控件呈现为范围,“controltovalidate”属性呈现为expando属性。下面是一个测试示例:

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript" src="jquery.js"></script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1"
            ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>

        <asp:Button ID="Button1" runat="server" Text="Button" /></div>

        <input type="button" value="Test" onclick="ml_test();" />

        <script type="text/javascript">
            ml_test = function() {
                alert($('[controltovalidate=TextBox1]').get().length);
            };
        </script>

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

渲染为:

(code removed here)

        <input name="TextBox1" type="text" id="TextBox1" />
        <span id="RequiredFieldValidator1" style="color:Red;visibility:hidden;">RequiredFieldValidator</span>
        <span id="RegularExpressionValidator1"></span>

        <input type="submit" name="Button1" value="Button" onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(&quot;Button1&quot;, &quot;&quot;, true, &quot;&quot;, &quot;&quot;, false, false))" id="Button1" /></div>

        <input type="button" value="Test" onclick="ml_test();" />

        <script type="text/javascript">
            ml_test = function() {
                alert($('[controltovalidate=TextBox1]').get().length);
            };
        </script>

(code removed here)

<script type="text/javascript">
//<![CDATA[
var RequiredFieldValidator1 = document.all ? document.all["RequiredFieldValidator1"] : document.getElementById("RequiredFieldValidator1");
RequiredFieldValidator1.controltovalidate = "TextBox1";
RequiredFieldValidator1.errormessage = "RequiredFieldValidator";
RequiredFieldValidator1.evaluationfunction = "RequiredFieldValidatorEvaluateIsValid";
RequiredFieldValidator1.initialvalue = "";
//]]>
</script>

问题是:ml_test()函数在InternetExplorer7中显示1(如预期的那样),但在Firefox3.6.8中显示0。我试着添加额外的控件,但在Firefox中总是不起作用。

我发现 this post 它显示了在选择器中像这样使用符号 [@expando=value] ,但当我尝试这种语法时,jQuery1.4.2会抛出一个错误。

2 回复 | 直到 14 年前

Nick Craver 14 年前

.filter()

ml_test = function() {
    alert($('span').filter(function() { return this.controltovalidate=='TextBox1'; }).length);
};

You can test it here ,或将其设置为自定义选择器,如下所示:

jQuery.expr[':'].validatorFor = function(o, i, m){
  return o.controltovalidate === m[3];
};â

ml_test = function() {
    alert($('span:validatorFor(TextBox1)').length);
};

You can that that version here .

Silkster 14 年前

如果无效,是否要查找显示验证消息的范围?

如果是这样,请尝试以下操作:(使用jQuery)

ml_test = function() {
    alert($('RequiredFieldValidator1').length);
};

ml_test = function() {

    // getting the control with jQuery by its ID.  .Net already has it
    // defined in the script block that is generated by the 
    // RequiredFieldValidator control
    var validateCtrl = $(RequiredFieldValidator1.id);  

    // get the value from the .Net-defined validator variable
    var controlToValidate = RequiredFieldValidator1.controltovalidate;

    // alert the values:
    alert('RequiredValidatorControl count: ' + validator.length + 
          '\nControl To Validate: ' + controlToValidate);

};