jQuery hasAttr checking to see if there is an attribute on an element

Possible Duplicate:
Check existence of an attribute with JQuery

How do you check if there is an attribute on an element in jQuery? Similar to hasClass , but with attr ?

For example,

if ($(this).hasAttr("name")) {
    // ...
}

---

var attr = $(this).attr('name');

// For some browsers, `attr` is undefined; for others,
// `attr` is false.  Check for both.
if (typeof attr !== typeof undefined && attr !== false) {
    // ...
}

---

How about just $(this).is("[name]") ?

The [attr] syntax is the CSS selector for an element with an attribute attr , and .is() checks if the element it is called on matches the given CSS selector.

---

如果你经常检查属性的存在，我会建议创建一个hasAttr函数，以便在你的问题中使用你的假设：

$.fn.hasAttr = function(name) {  
   return this.attr(name) !== undefined;
};

$(document).ready(function() {
    if($('.edit').hasAttr('id')) {
        alert('true');
    } else {
        alert('false');
    }
});

<div class="edit" id="div_1">Test field</div>

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