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Normally, the selector can directly locate the element we want, but when we get a jQuery object, we can also use this object as a basis to search and filter. This article mainly introduces the relevant information of jQuery search and filtering in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.
The most common search is to search among all child nodes of a node, using the find() method, which itself receives an arbitrary selector. For example, the following HTML structure:
<!-- HTML结构 --> <ul class="lang"> <li class="js dy">JavaScript</li> <li class="dy">Python</li> <li id="swift">Swift</li> <li class="dy">Scheme</li> <li name="haskell">Haskell</li> </ul>
Use find() to find:
var ul = $('ul.lang'); // 获得<ul> var dy = ul.find('.dy'); // 获得JavaScript, Python, Scheme var swf = ul.find('#swift'); // 获得Swift var hsk = ul.find('[name=haskell]'); // 获得Haskell
If you want to search upward from the current node, use the parent() method:
var swf = $('#swift'); // 获得Swift var parent = swf.parent(); // 获得Swift的上层节点<ul> var a = swf.parent('p.red'); // 从Swift的父节点开始向上查找,直到找到某个符合条件的节点并返回
For nodes at the same level, you can use the next() and prev() methods, For example:
After we have got the Swift node:
var swift = $('#swift'); swift.next(); // Scheme swift.next('[name=haskell]'); // Haskell,因为Haskell是后续第一个符合选择器条件的节点 swift.prev(); // Python swift.prev('.js'); // JavaScript,因为JavaScript是往前第一个符合选择器条件的节点
Filter
Similar to map and filter in functional programming, jQuery objects also have similar methods.
filter() method can filter out nodes that do not meet the selector conditions:
var langs = $('ul.lang li'); // 拿到JavaScript, Python, Swift, Scheme和Haskell var a = langs.filter('.dy'); // 拿到JavaScript, Python, Scheme
or When passing in a function, pay special attention to the fact that this inside the function is bound to a DOM object, not a jQuery object:
var langs = $('ul.lang li'); // 拿到JavaScript, Python, Swift, Scheme和Haskell langs.filter(function () { return this.innerHTML.indexOf('S') === 0; // 返回S开头的节点 }); // 拿到Swift, Scheme
map() method converts several DOM nodes contained in a jQuery object into other objects:
var langs = $('ul.lang li'); // 拿到JavaScript, Python, Swift, Scheme和Haskell var arr = langs.map(function () { return this.innerHTML; }).get(); // 用get()拿到包含string的Array:['JavaScript', 'Python', 'Swift', 'Scheme', 'Haskell']
In addition, if a jQuery object contains more than one DOM node, first(), last() and slice()Method can return a new jQuery object and remove unnecessary DOM nodes:
var langs = $('ul.lang li'); // 拿到JavaScript, Python, Swift, Scheme和Haskell var js = langs.first(); // JavaScript,相当于$('ul.lang li:first-child') var haskell = langs.last(); // Haskell, 相当于$('ul.lang li:last-child') var sub = langs.slice(2, 4); // Swift, Scheme, 参数和数组的slice()方法一致
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