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I have some data in a sql table. I send it via JSON to my JavaScript.
From there I need to pose it into HTML for display to the user by 1 of 2 ways.
- By posing the html string and inserting into .innerHTML property of the holding element
- By using createElment() for each element I need and appending into the DOM directly
Neither of the questions below gives a quantifiable answer.
From first answer in first link, 3rd Reason ( first two reasons stated don't apply to my environment )
Could be faster in some cases
Can someone establish a base case of when createElement() method is faster and why?
That way people could make an educated guess of which to use, given their environment.
In my case I don't have concerns for preserving existing DOM structure or Event Listeners. Just efficiency ( speed ).
I am not using a library regarding the second link I provided. But it is there for those who may.
Research / Links
Advantages of createElement over innerHTML?
JavaScript: Is it better to use innerHTML or (lots of) createElement calls to add a plex div structure?
I have some data in a sql table. I send it via JSON to my JavaScript.
From there I need to pose it into HTML for display to the user by 1 of 2 ways.
- By posing the html string and inserting into .innerHTML property of the holding element
- By using createElment() for each element I need and appending into the DOM directly
Neither of the questions below gives a quantifiable answer.
From first answer in first link, 3rd Reason ( first two reasons stated don't apply to my environment )
Could be faster in some cases
Can someone establish a base case of when createElement() method is faster and why?
That way people could make an educated guess of which to use, given their environment.
In my case I don't have concerns for preserving existing DOM structure or Event Listeners. Just efficiency ( speed ).
I am not using a library regarding the second link I provided. But it is there for those who may.
Research / Links
Advantages of createElement over innerHTML?
JavaScript: Is it better to use innerHTML or (lots of) createElement calls to add a plex div structure?
Share Improve this question edited May 23, 2017 at 10:30 CommunityBot 11 silver badge asked May 30, 2012 at 16:09 user656925user656925 3- 3 There's always jsperf where you can try things out. – Pointy Commented May 30, 2012 at 16:11
- This isn't an answer that someone can just know. It depends on how your code is written and what you're doing. The only real way to know is to test it with both methods. – j08691 Commented May 30, 2012 at 16:23
- See also Is it possible to append to innerHTML without destroying descendants' event listeners? – Bergi Commented Oct 4, 2016 at 19:22
2 Answers
Reset to default 5Adding to the DOM n times takes n times more time than adding to the DOM a single time. (:P)
This is the logic I'm personally following.
In consequence, when it is about to create, for instance, a SELECT element, and add to it several options, I prefer to add up all options at once using innerHTML than using a createElement call n times.
This is a bit the same as to pare BATCH operation to "one to one"... whenever you can factorise, you should!
EDIT: Reading the ments I understand that there's a feature (DOM DocumentFragment) that allow us saving such overhead and at the same time taking advantage of the DOM encapsulation. In this case, if the performances are really parable, I would definitely not doubt and chose the DOM option.
I thought I read somewhere that the createElement and appendElement is faster. It makes sense, considering document.write() and innerHTML have to parse a string, and create and append the elements too. I wrote a quick test to confirm this:
<html>
<body>
<script src="http://ajax.googleapis./ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script>
function inner() {
var test = '';
for (var i=0; i<10000; i++) {
test += '<p><a href="../" target="_blank">bogus link</a> with some other <strong>stuff</strong></p>';
}
console.time('innerHTML');
document.getElementById('test').innerHTML = test;
console.timeEnd('innerHTML');
}
function jq() {
var test = '';
for (var i=0; i<10000; i++) {
test += '<p><a href="../" target="_blank">bogus link</a> with some other <strong>stuff</strong></p>';
}
console.time('jquery');
jQuery('#test').html(test);
console.timeEnd('jquery');
}
function createEl() {
var dest = document.getElementById('test');
console.time('createel');
//dest.innerHTML = '';//Not IE though?
var repl = document.createElement('div');
repl.setAttribute('id','test');
for (var i=0; i<10000; i++) {
var p = document.createElement('p');
var a = document.createElement('a');
a.setAttribute('href','../'); a.setAttribute('target','_blank');
a.appendChild(document.createTextNode("bogus link"));
p.appendChild(a);
p.appendChild(document.createTextNode(" with some other "));
var bold = document.createElement('strong');
bold.appendChild(document.createTextNode("stuff"));
p.appendChild(bold);
repl.appendChild(p);
}
dest.parentNode.replaceChild(repl,dest);
console.log('create-element:');
console.timeEnd('createel');
}
</script>
<button onclick="inner()">innerhtml</button>
<button onclick="jq()">jquery html</button>
<button onclick="createEl()">Create-elements</button>
<div id="test">To replace</div>
</body>
</html>
In this example, the createElement - appendChild method of writing out HTML works significantly faster than innerHTML/jQuery!
本文标签： javascriptcreateElement() vs innerHTML When to useStack Overflow
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