admin管理员组文章数量:1127598
Can you please tell me if there is any DOM API which search for an element with given attribute name and attribute value:
Something like:
doc.findElementByAttribute("myAttribute", "aValue");
Can you please tell me if there is any DOM API which search for an element with given attribute name and attribute value:
Something like:
doc.findElementByAttribute("myAttribute", "aValue");
Share
Improve this question
edited Sep 30, 2014 at 17:37
Nakilon
35k16 gold badges111 silver badges146 bronze badges
asked Apr 22, 2010 at 21:27
michaelmichael
110k118 gold badges257 silver badges351 bronze badges
0
11 Answers
Reset to default 825Modern browsers support native querySelectorAll
so you can do:
document.querySelectorAll('[data-foo="value"]');
https://developer.mozilla.org/en-US/docs/Web/API/Document.querySelectorAll
Details about browser compatibility:
- http://quirksmode.org/dom/core/#t14
- http://caniuse.com/queryselector
You can use jQuery to support obsolete browsers (IE9 and older):
$('[data-foo="value"]');
Update: In the past few years the landscape has changed drastically. You can now reliably use querySelector
and querySelectorAll
, see Wojtek's answer for how to do this.
There's no need for a jQuery dependency now. If you're using jQuery, great...if you're not, you need not rely it on just for selecting elements by attributes anymore.
There's not a very short way to do this in vanilla javascript, but there are some solutions available.
You do something like this, looping through elements and checking the attribute
If a library like jQuery is an option, you can do it a bit easier, like this:
$("[myAttribute=value]")
If the value isn't a valid CSS identifier (it has spaces or punctuation in it, etc.), you need quotes around the value (they can be single or double):
$("[myAttribute='my value']")
You can also do start-with
, ends-with
, contains
, etc...there are several options for the attribute selector.
We can use attribute selector in DOM by using document.querySelector()
and document.querySelectorAll()
methods.
for yours:
document.querySelector("[myAttribute='aValue']");
and by using querySelectorAll()
:
document.querySelectorAll("[myAttribute='aValue']");
In querySelector()
and querySelectorAll()
methods we can select objects as we select in "CSS".
More about "CSS" attribute selectors in https://developer.mozilla.org/en-US/docs/Web/CSS/Attribute_selectors
Use query selectors. Examples:
document.querySelectorAll(' input[name], [id|=view], [class~=button] ')
input[name]
Inputs elements with name
property.
[id|=view]
Elements with id that start with view-
.
[class~=button]
Elements with the button
class.
FindByAttributeValue("Attribute-Name", "Attribute-Value");
p.s. if you know exact element-type, you add 3rd parameter (i.e.div, a, p ...etc...
):
FindByAttributeValue("Attribute-Name", "Attribute-Value", "div");
but at first, define this function:
function FindByAttributeValue(attribute, value, element_type) {
element_type = element_type || "*";
var All = document.getElementsByTagName(element_type);
for (var i = 0; i < All.length; i++) {
if (All[i].getAttribute(attribute) == value) { return All[i]; }
}
}
p.s. updated per comments recommendations.
Here's how you can select using querySelector
:
document.querySelector("tagName[attributeName='attributeValue']")
Amendment for Daniel De León's Answer
It's possible to search with
^=
- filters Elements where id (or any other attr) starts with view
keyword
document.querySelectorAll("[id^='view']")
Here is an example , How to search images in a document by src attribute :
document.querySelectorAll("img[src='https://pbs.twimg.com/profile_images/........jpg']");
you could use getAttribute:
var p = document.getElementById("p");
var alignP = p.getAttribute("align");
https://developer.mozilla.org/en-US/docs/Web/API/Element/getAttribute
very simple, try this
<h1>The Document Object</h1>
<h2>The querySelector() Method</h2>
<h3>Add a background color to the first p element:</h3>
<p>This is a p element.</p>
<p data-vid="1">This is a p element.</p>
<p data-vid="2">This is a p element.</p>
<p data-vid="3">This is a p element.</p>
<script>
document.querySelector("p[data-vid='1']").style.backgroundColor = "red";
document.querySelector("p[data-vid='2']").style.backgroundColor = "pink";
document.querySelector("p[data-vid='3']").style.backgroundColor = "blue";
</script>
function optCount(tagId, tagName, attr, attrval) {
inputs = document.getElementById(tagId).getElementsByTagName(tagName);
if (inputs) {
var reqInputs = [];
inputsCount = inputs.length;
for (i = 0; i < inputsCount; i++) {
atts = inputs[i].attributes;
var attsCount = atts.length;
for (j = 0; j < attsCount; j++) {
if (atts[j].nodeName == attr && atts[j].nodeValue == attrval) {
reqInputs.push(atts[j].nodeName);
}
}
}
}
else {
alert("no such specified tags present");
}
return reqInputs.length;
}//optcount function closed
This is a function which is is used tu to select a particular tag with specific attribute value. The parameters to be passed are are the tag ID, then the tag name - inside that tag ID, and the attribute and fourth the attribute value. This function will return the number of elements found with the specified attribute and its value. You can modify it according to you.
本文标签: javascriptFind an element in DOM based on an attribute valueStack Overflow
版权声明:本文标题:javascript - Find an element in DOM based on an attribute value - Stack Overflow 内容由网友自发贡献,该文观点仅代表作者本人, 转载请联系作者并注明出处:http://www.betaflare.com/web/1736687701a1947753.html, 本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌抄袭侵权/违法违规的内容,一经查实,本站将立刻删除。
发表评论