Javascript 检查 jQuery 中是否存在 Attribute('id')
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Check if Attribute('id') Exists in jQuery
提问by CodeMan5000
How can I check if an attribute Id exists in jQuery?
如何检查 jQuery 中是否存在属性 Id？
I searched around and found that this should work:
我四处搜索，发现这应该有效：
if ($(this).attr('id').attr('id'))
{
}
I still get this error: TypeError: Object gauge1 has no method 'attr'
我仍然收到此错误：TypeError: Object Gauge1 has no method 'attr'
回答by Adriano Carneiro
This itself will work:
这本身会起作用：
if($(this).attr("id"))
Check existing jsfiddle on the issue: http://jsfiddle.net/rwaldron/wVqvr/4/
检查现有的 jsfiddle 问题：http: //jsfiddle.net/rwaldron/wVqvr/4/
回答by Selvakumar Arumugam
Just try it the old way
用旧方法试试
if (this.id) {
//do something
}
回答by Guffa
You can use the ismethodand the Has Attribute Selector:
您可以使用该is方法和Has Attribute Selector：
if ($(this).is('[id]')) {
}
回答by tarun
if ($(this).attr('id')){
alert(id);
}
if ($(this).attr('id')){
alert(id);
}
回答by Gromer
HTML:
HTML：
<div class="hey"></div>
<div class="you" id="woah"></div>
<div id="results"></div>?
jQuery:
jQuery：
var id = $('div.hey').attr('id');
if (id) {
// Have an id.
} else {
// Don't have an id.
}
A fiddle: http://jsfiddle.net/NEVYT/
回答by Travis J
you could also just use the plain js object
你也可以只使用普通的 js 对象
if( this.id !== undefined && this.id.length > 0 ){
//todo: use id
}
