The information I need is in a meta tag. How can I access the "content"
data of the meta tag when property="video"
?
HTML:
<meta property="video" content="http://video.com/video33353.mp4" />
This question is related to
javascript
html
greasemonkey
meta-tags
You can use this:
function getMeta(metaName) {
const metas = document.getElementsByTagName('meta');
for (let i = 0; i < metas.length; i++) {
if (metas[i].getAttribute('name') === metaName) {
return metas[i].getAttribute('content');
}
}
return '';
}
console.log(getMeta('video'));
if the meta tag is:
<meta name="url" content="www.google.com" />
JQuery will be:
const url = $('meta[name="url"]').attr('content'); // url = 'www.google.com'
JavaScript will be: (It will return whole HTML)
const metaHtml = document.getElementsByTagName('meta').url // metaHtml = '<meta name="url" content="www.google.com" />'
FYI according to https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta global attributes are valid which means the id
attribute can be used with getElementById
.
Simple one, right?
document.head.querySelector("meta[property=video]").content
function getMetaContentByName(name,content){
var content = (content==null)?'content':content;
return document.querySelector("meta[name='"+name+"']").getAttribute(content);
}
Used in this way:
getMetaContentByName("video");
The example on this page:
getMetaContentByName("twitter:domain");
If you are interessted in a more far-reaching solution to get all meta tags you could use this piece of code
function getAllMetas() {
var metas = document.getElementsByTagName('meta');
var summary = [];
Array.from(metas)
.forEach((meta) => {
var tempsum = {};
var attributes = meta.getAttributeNames();
attributes.forEach(function(attribute) {
tempsum[attribute] = meta.getAttribute(attribute);
});
summary.push(tempsum);
});
return summary;
}
// usage
console.log(getAllMetas());
In Jquery you can achieve this with:
$("meta[property='video']");
In JavaScript you can achieve this with:
document.getElementsByTagName('meta').item(property='video');
<html>
<head>
<meta property="video" content="http://video.com/video33353.mp4" />
<meta name="video" content="http://video.com/video33353.mp4" />
</head>
<body>
<script>
var meta = document.getElementsByTagName("meta");
size = meta.length;
for(var i=0; i<size; i++) {
if (meta[i].getAttribute("property") === "video") {
alert(meta[i].getAttribute("content"));
}
}
meta = document.getElementsByTagName("meta")["video"].getAttribute("content");
alert(meta);
</script>
</body>
</html>
If you use JQuery, you can use:
$("meta[property='video']").attr('content');
Here's a function that will return the content of any meta tag and will memoize the result, avoiding unnecessary querying of the DOM.
var getMetaContent = (function(){
var metas = {};
var metaGetter = function(metaName){
var theMetaContent, wasDOMQueried = true;;
if (metas[metaName]) {
theMetaContent = metas[metaName];
wasDOMQueried = false;
}
else {
Array.prototype.forEach.call(document.getElementsByTagName("meta"), function(el) {
if (el.name === metaName) theMetaContent = el.content;
metas[metaName] = theMetaContent;
});
}
console.log("Q:wasDOMQueried? A:" + wasDOMQueried);
return theMetaContent;
}
return metaGetter;
})();
getMetaContent("description"); /* getMetaContent console.logs the content of the description metatag. If invoked a second time it confirms that the DOM was only queried once */
And here's an extended version that also queries for open graph tags, and uses Array#some:
var getMetaContent = (function(){
var metas = {};
var metaGetter = function(metaName){
wasDOMQueried = true;
if (metas[metaName]) {
wasDOMQueried = false;
}
else {
Array.prototype.some.call(document.getElementsByTagName("meta"), function(el) {
if(el.name === metaName){
metas[metaName] = el.content;
return true;
}
if(el.getAttribute("property") === metaName){
metas[metaName] = el.content;
return true;
}
else{
metas[metaName] = "meta tag not found";
}
});
}
console.info("Q:wasDOMQueried? A:" + wasDOMQueried);
console.info(metas);
return metas[metaName];
}
return metaGetter;
})();
getMetaContent("video"); // "http://video.com/video33353.mp4"
I personally prefer to just get them in one object hash, then I can access them anywhere. This could easily be set to an injectable variable and then everything could have it and it only grabbed once.
By wrapping the function this can also be done as a one liner.
var meta = (function () {
var m = document.querySelectorAll("meta"), r = {};
for (var i = 0; i < m.length; i += 1) {
r[m[i].getAttribute("name")] = m[i].getAttribute("content")
}
return r;
})();
The other answers should probably do the trick, but this one is simpler and does not require jQuery:
document.head.querySelector("[property~=video][content]").content;
The original question used an RDFa tag with a property=""
attribute. For the normal HTML <meta name="" …>
tags you could use something like:
document.querySelector('meta[name="description"]').content
copy all meta values to a cache-object:
/* <meta name="video" content="some-video"> */
const meta = Array.from(document.querySelectorAll('meta[name]')).reduce((acc, meta) => (
Object.assign(acc, { [meta.name]: meta.content })), {});
console.log(meta.video);
There is an easier way:
document.getElementsByName('name of metatag')[0].getAttribute('content')
function getDescription() {
var info = document.getElementsByTagName('meta');
return [].filter.call(info, function (val) {
if(val.name === 'description') return val;
})[0].content;
}
update version:
function getDesc() {
var desc = document.head.querySelector('meta[name=description]');
return desc ? desc.content : undefined;
}
My variant of the function:
const getMetaValue = (name) => {
const element = document.querySelector(`meta[name="${name}"]`)
return element?.getAttribute('content')
}
One liner here
document.querySelector("meta[property='og:image']").getAttribute("content");
Way - [ 1 ]
function getMetaContent(property, name){
return document.head.querySelector("["+property+"="+name+"]").content;
}
console.log(getMetaContent('name', 'csrf-token'));
You may get error: Uncaught TypeError: Cannot read property 'getAttribute' of null
Way - [ 2 ]
function getMetaContent(name){
return document.getElementsByTagName('meta')[name].getAttribute("content");
}
console.log(getMetaContent('csrf-token'));
You may get error: Uncaught TypeError: Cannot read property 'getAttribute' of null
Way - [ 3 ]
function getMetaContent(name){
name = document.getElementsByTagName('meta')[name];
if(name != undefined){
name = name.getAttribute("content");
if(name != undefined){
return name;
}
}
return null;
}
console.log(getMetaContent('csrf-token'));
Instead getting error, you get null
, that is good.
This code works for me
<meta name="text" property="text" content="This is text" />
<meta name="video" property="text" content="http://video.com/video33353.mp4" />
JS
var x = document.getElementsByTagName("META");
var txt = "";
var i;
for (i = 0; i < x.length; i++) {
if (x[i].name=="video")
{
alert(x[i].content);
}
}
Example fiddle: http://jsfiddle.net/muthupandiant/ogfLwdwt/
Source: Stackoverflow.com