本文翻译自:jQuery document.createElement equivalent?
I'm refactoring some old JavaScript code and there's a lot of DOM manipulation going on. 我正在重构一些旧的JavaScript代码,并且正在进行大量的DOM操作。
var d = document;
var odv = d.createElement("div");
odv.style.display = "none";
this.OuterDiv = odv;
var t = d.createElement("table");
t.cellSpacing = 0;
t.className = "text";
odv.appendChild(t);
I would like to know if there is a better way to do this using jQuery. 我想知道是否有更好的方法来使用jQuery。 I've been experimenting with: 我一直在尝试:
var odv = $.create("div");
$.append(odv);
// And many more
But I'm not sure if this is any better. 但我不确定这是否更好。
#1楼
参考:https://stackoom.com/question/17qU/jQuery-document-createElement等价
#2楼
I'm doing like that: 我这样做:
$('<div/>',{
text: 'Div text',
class: 'className'
}).appendTo('#parentDiv');
#3楼
since jQuery1.8
, using $.parseHTML()
to create elements is a better choice. 从jQuery1.8
,使用$.parseHTML()
创建元素是一个更好的选择。
there are two benefits: 有两个好处:
1.if you use the old way, which may be something like $(string)
, jQuery will examine the string to make sure you want to select a html tag or create a new element. 1.如果您使用旧的方式,可能类似于$(string)
,jQuery将检查字符串以确保您要选择html标记或创建新元素。 By using $.parseHTML()
, you tell jQuery that you want to create a new element explicitly, so the performance may be a little better. 通过使用$.parseHTML()
,您告诉jQuery您要明确地创建一个新元素,因此性能可能会好一些。
2.much more important thing is that you may suffer from cross site attack ( more info ) if you use the old way. 2.更重要的是,如果你使用旧的方式,你可能会受到跨站点攻击( 更多信息 )。 if you have something like: 如果你有类似的东西:
var userInput = window.prompt("please enter selector");
$(userInput).hide();
a bad guy can input <script src="xss-attach.js"></script>
to tease you. 坏人可以输入<script src="xss-attach.js"></script>
来取笑你。 fortunately, $.parseHTML()
avoid this embarrassment for you: 幸运的是, $.parseHTML()
避免了这种尴尬:
var a = $('<div>')
// a is [<div></div>]
var b = $.parseHTML('<div>')
// b is [<div></div>]
$('<script src="xss-attach.js"></script>')
// jQuery returns [<script src="xss-attach.js"></script>]
$.parseHTML('<script src="xss-attach.js"></script>')
// jQuery returns []
However, please notice that a
is a jQuery object while b
is a html element: 但是,请注意a
是jQuery对象,而b
是html元素:
a.html('123')
// [<div>123</div>]
b.html('123')
// TypeError: Object [object HTMLDivElement] has no method 'html'
$(b).html('123')
// [<div>123</div>]
#4楼
UPDATE UPDATE
As of the latest versions of jQuery, the following method doesn't assign properties passed in the second Object 从jQuery的最新版本开始,以下方法不会分配在第二个Object中传递的属性
Previous answer 以前的答案
I feel using document.createElement('div')
together with jQuery
is faster: 我觉得使用document.createElement('div')
和jQuery
更快:
$(document.createElement('div'), {
text: 'Div text',
'class': 'className'
}).appendTo('#parentDiv');
#5楼
I've just made a small jQuery plugin for that: https://github.com/ern0/jquery.create 我刚刚为它制作了一个小的jQuery插件: https : //github.com/ern0/jquery.create
It follows your syntax: 它遵循您的语法:
var myDiv = $.create("div");
DOM node ID can be specified as second parameter: DOM节点ID可以指定为第二个参数:
var secondItem = $.create("div","item2");
Is it serious? 这是认真的吗? No. But this syntax is better than $("<div></div>") , and it's a very good value for that money. 不。但是这种语法比$(“<div> </ div>”)好 ,而且这个钱非常好。
I'm a new jQuery user, switching from DOMAssistant, which has a similar function: http://www.domassistant.com/documentation/DOMAssistantContent-module.php 我是一个新的jQuery用户,从DOMAssistant切换,它具有类似的功能: http : //www.domassistant.com/documentation/DOMAssistantContent-module.php
My plugin is simpler, I think attrs and content is better to add by chaining methods: 我的插件更简单,我认为通过链接方法添加更好的内容和内容:
$("#container").append( $.create("div").addClass("box").html("Hello, world!") );
Also, it's a good example for a simple jQuery-plugin (the 100th one). 此外,它是一个简单的jQuery插件(第100个)的一个很好的例子。
#6楼
Though this is a very old question, I thought it would be nice to update it with recent information; 虽然这是一个非常古老的问题,但我认为用最新信息更新它会很好;
Since jQuery 1.8 there is a jQuery.parseHTML() function which is now a preferred way of creating elements. 从jQuery 1.8开始,有一个jQuery.parseHTML()函数,它现在是创建元素的首选方法。 Also, there are some issues with parsing HTML via $('(html code goes here)')
, fo example official jQuery website mentions the following in one of their release notes : 此外,通过$('(html code goes here)')
解析HTML存在一些问题,例如官方jQuery网站在其发布说明中提及以下内容:
Relaxed HTML parsing: You can once again have leading spaces or newlines before tags in $(htmlString). 轻松的HTML解析:您可以在$(htmlString)中的标签之前再次拥有前导空格或换行符。 We still strongly advise that you use $.parseHTML() when parsing HTML obtained from external sources, and may be making further changes to HTML parsing in the future. 我们仍强烈建议您在解析从外部源获取的HTML时使用$ .parseHTML(),并且可能在将来对HTML解析进行进一步更改。
To relate to the actual question, provided example could be translated to: 为了与实际问题相关,提供的示例可以转换为:
this.$OuterDiv = $($.parseHTML('<div></div>'))
.hide()
.append($($.parseHTML('<table></table>'))
.attr({ cellSpacing : 0 })
.addClass("text")
)
;
which is unfortunately less convenient than using just $()
, but it gives you more control, for example you may choose to exclude script tags (it will leave inline scripts like onclick
though): 不幸的是,它比使用$()
更方便,但它可以让你获得更多的控制权,例如你可以选择排除脚本标签(它会留下像onclick
这样的内联脚本):
> $.parseHTML('<div onclick="a"></div><script></script>')
[<div onclick="a"></div>]
> $.parseHTML('<div onclick="a"></div><script></script>', document, true)
[<div onclick="a"></div>, <script></script>]
Also, here's a benchmark from the top answer adjusted to the new reality: 此外,这里是从最佳答案调整到新现实的基准:
jQuery 1.9.1 jQuery 1.9.1
$.parseHTML: 88ms $($.parseHTML): 240ms <div></div>: 138ms <div>: 143ms createElement: 64ms
It looks like parseHTML
is much closer to createElement
than $()
, but all the boost is gone after wrapping the results in a new jQuery object 看起来parseHTML
比$()
更接近createElement
,但是在将结果包装到新的jQuery对象之后,所有的提升都消失了