通过属性名获取 HTML 元素

JavaScript 中有一些方法可以使用它们的 ID、 Class 和 Tag 来获取 HTML 元素。

document.getElementByID(*id*);
document.getElementsByClassName(*class*);
document.getElementsByTagName(*tag*);

是否有任何方法可用于根据属性名获取元素。

例如:

<span property="v:name">Basil Grilled Tomatoes and Onions</span>

比如:

document.getElementsByAttributeName("property");
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I think you want to take a look at jQuery since that Javascript library provides a lot of functionality you might want to use in this kind of cases. In your case you could write (or find one on the internet) a hasAttribute method, like so (not tested):

$.fn.hasAttribute = function(tagName, attrName){
var result = [];
$.each($(tagName), function(index, value) {
var attr = $(this).attr(attrName);
if (typeof attr !== 'undefined' && attr !== false)
result.push($(this));
});
return result;
}
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最佳答案

Yes, the function is querySelectorAll (or querySelector for a single element), which allows you to use CSS selectors to find elements.

document.querySelectorAll('[property]'); // All with attribute named "property"
document.querySelectorAll('[property="value"]'); // All with "property" set to "value" exactly.

(Complete list of attribute selectors on MDN.)

This finds all elements with the attribute property. It would be better to specify a tag name if possible:

document.querySelectorAll('span[property]');

You can work around this if necessary by looping through all the elements on the page to see whether they have the attribute set:

var withProperty = [],
els = document.getElementsByTagName('span'), // or '*' for all types of element
i = 0;


for (i = 0; i < els.length; i++) {
if (els[i].hasAttribute('property')) {
withProperty.push(els[i]);
}
}

Libraries such as jQuery handle this for you; it's probably a good idea to let them do the heavy lifting.

For anyone dealing with ancient browsers, note that querySelectorAll was introduced to Internet Explorer in v8 (2009) and fully supported in IE9. All modern browsers support it.

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In jQuery this is so:

$("span['property'=v:name]"); // for selecting your span element
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You can get attribute using javascript,

element.getAttribute(attributeName);

Ex:

var wrap = document.getElementById("wrap");
var myattr = wrap.getAttribute("title");

Refer:

https://developer.mozilla.org/en/DOM/element.getAttribute

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With prototypejs :

 $$('span[property=v.name]');

or 

document.body.select('span[property=v.name]');

Both return an array

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Just another answer

Array.prototype.filter.call(
document.getElementsByTagName('span'),
function(el) {return el.getAttribute('property') == 'v.name';}
);

In future

Array.prototype.filter.call(
document.getElementsByTagName('span'),
(el) => el.getAttribute('property') == 'v.name'
)

3rd party edit

Intro

  • The call() method calls a function with a given this value and arguments provided individually.

  • The filter() method creates a new array with all elements that pass the test implemented by the provided function.

Given this html markup

<span property="a">apple - no match</span>
<span property="v:name">onion - match</span>
<span property="b">root - match</span>
<span property="v:name">tomato - match</span>
<br />
<button onclick="findSpan()">find span</button>

you can use this javascript

function findSpan(){


var spans = document.getElementsByTagName('span');
var spansV = Array.prototype.filter.call(
spans,
function(el) {return el.getAttribute('property') == 'v:name';}
);
return spansV;
}

See demo

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You can use querySelectorAll:

    document.querySelectorAll('span[property=name]');
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Let's assume that you have an input:

         <input type='text' name='from'/>

then you can access it as follow:

        document.querySelector('input[name="from"]')

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