jquery属性选择器:如何查询具有自定义命名空间的属性

jQuery 不直接支持自定义命名空间,但可以使用筛选函数查找要查找的div。

// find all divs that have custom:attr
$('div').filter(function() { return $(this).attr('custom:attr'); }).each(function() {
  // matched a div with custom::attr
  $(this).html('I was found.');
});

这在某些情况下有效:

$("div[custom\\:attr]")

但是,有关更高级的方法,请参见 this XML Namespace jQuery plug-in

按属性匹配的语法为:

$("div[customattr=bla]") 比赛 div customattr="bla"

$("[customattr]") 将所有标记与属性匹配 "customattr"

具有类似的命名空间属性 'custom:attr' 不工作

Here 你可以找到一个很好的概述。

你应该使用 $('div').attr('custom:attr') .

下面是一个对我有用的自定义选择器的实现。

// Custom jQuery selector to select on custom namespaced attributes
$.expr[':'].nsAttr = function(obj, index, meta, stack) {

    // if the parameter isn't a string, the selector is invalid, 
    // so always return false.
    if ( typeof meta[3] != 'string' )
        return false;

    // if the parameter doesn't have an '=' character in it, 
    // assume it is an attribute name with no value, 
    // and match all elements that have only that attribute name.
    if ( meta[3].indexOf('=') == -1 )
    {
        var val = $(obj).attr(meta[3]);
        return (typeof val !== 'undefined' && val !== false);
    }
    // if the parameter does contain an '=' character, 
    // we should only match elements that have an attribute 
    // with a matching name and value.
    else
    {
        // split the parameter into name/value pairs
        var arr = meta[3].split('=', 2);
        var attrName  = arr[0];
        var attrValue = arr[1];

        // if the current object has an attribute matching the specified 
        // name & value, include it in our selection.
        return ( $(obj).attr(attrName) == attrValue );
    }
};

示例用法:

// Show all divs where the custom attribute matches both name and value.
$('div:nsAttr(MyNameSpace:customAttr=someValue)').show();

// Show all divs that have the custom attribute, regardless of its value.
$('div:nsAttr(MyNameSpace:customAttr)').show();