jQuery-查找元素是否在变量中 [英] jquery - finding if element is in variable

问题描述

im试图找出如何查看AJAX请求是否返回了错误. 测试请求始终返回<p id="error">test</p>

im trying to find out how to see if an error is returned from an AJAX request. for testing the request always returns <p id="error">test</p>

我认为您可以这样做:

//html is the var which contains the result
var DOM = $(html);
if( $('#error', DOM ).length != 0 ) {
    alert(html);    
}

但是这不起作用.任何人都可以照亮问题所在吗?

but this does not work. Can anyone shine a light on whats going wrong?

推荐答案

如果您的HTML没有包裹在某些东西中(例如div)，则需要包裹它.

If your HTML isn't wrapped in something (like a div) then it needs to be.

var html = '<div></div><p id="error">ERROR!</p><span>other stuff</span>';

var DOM= $('<div>' + html + '</div>');
if( $('#error', DOM).length != 0 ) {
    alert(html);    
}

示例: http://jsfiddle.net/jonathon/exqTD/

(我认为wrap在这里会有所帮助，但没有帮助.如果有人知道为什么，请指出来).

(I thought wrap would help here but it doesn't. If anyone knows why then point it out).

或者，选择器上下文是使用查找来实现的，因此您可以这样做:

Alternatively, the selector context is implemented using find, so you could just do:

if( DOM.find('#error').length != 0 ) {
    alert(html);    
}

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