What is the correct way to write HTML using Javascript?

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I see in some posts that people frown upon using document.write() in javascript when writing dynamic HTML.

Why is this? and what is the correct way?

document.write() will only work while the page is being originally parsed and the DOM is being created. Once the browser gets to the closing </body> tag and the DOM is ready, you can't use document.write() anymore.

I wouldn't say using document.write() is correct or incorrect, it just depends on your situation. In some cases you just need to have document.write() to accomplish the task. Look at how Google analytics gets injected into most websites.

After DOM ready, you have two ways to insert dynamic HTML (assuming we are going to insert new HTML into <div id="node-id"></div>):

  1. Using innerHTML on a node:

    var node = document.getElementById('node-id');
    node.innerHTML('<p>some dynamic html</p>');
  2. Using DOM methods:

    var node = document.getElementById('node-id');
    var newNode = document.createElement('p');
    newNode.appendChild(document.createTextNode('some dynamic html'));

Using the DOM API methods might be the purist way to do stuff, but innerHTML has been proven to be much faster and is used under the hood in JavaScript libraries such as jQuery.

Note: The <script> will have to be inside your <body> tag for this to work.

What is the correct way to write HTML using Javascript?, Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java  JavaScript can "display" data in different ways: Writing into an HTML element, using innerHTML. Writing into the HTML output using document.write(). Writing into an alert box, using window.alert(). Writing into the browser console, using console.log().

document.write() doesn't work with XHTML. It's executed after the page has finished loading and does nothing more than write out a string of HTML.

Since the actual in-memory representation of HTML is the DOM, the best way to update a given page is to manipulate the DOM directly.

The way you'd go about doing this would be to programmatically create your nodes and then attach them to an existing place in the DOM. For [purposes of a contrived] example, assuming that I've got a div element maintaining an ID attribute of "header," then I could introduce some dynamic text by doing this:

// create my text
var sHeader = document.createTextNode('Hello world!');

// create an element for the text and append it
var spanHeader = document.createElement('span');

// grab a reference to the div header
var divHeader = document.getElementById('header');

// append the new element to the header

HTML DOM write() Method, In JavaScript, document.write() can be used to write directly to the HTML output The easiest way to modify the content of an HTML element is by using the  To write a JavaScript, you need a web browser and either a text editor or an HTML editor. Once you have the software in place, you can begin writing JavaScript code. To add JavaScript code to an HTML document, you need to create or open an HTML file with your text/HTML editor.

Perhaps a good idea is to use jQuery in this case. It provides handy functionality and you can do things like this:


Take a look at http://docs.jquery.com/Attributes/html#val for more information.

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  1. DOM methods, as outlined by Tom.

  2. innerHTML, as mentioned by iHunger.

DOM methods are highly preferable to strings for setting attributes and content. If you ever find yourself writing innerHTML= '<a href="'+path+'">'+text+'</a>' you're actually creating new cross-site-scripting security holes on the client side, which is a bit sad if you've spent any time securing your server-side.

DOM methods are traditionally described as ‘slow’ compared to innerHTML. But this isn't really the whole story. What is slow is inserting a lot of child nodes:

 for (var i= 0; i<1000; i++)
     div.parentNode.insertBefore(document.createElement('div'), div);

This translates to a load of work for the DOM finding the right place in its nodelist to insert the element, moving the other child nodes up, inserting the new node, updating the pointers, and so on.

Setting an existing attribute's value, or a text node's data, on the other hand, is very fast; you just change a string pointer and that's it. This is going to be much faster than serialising the parent with innerHTML, changing it, and parsing it back in (and won't lose your unserialisable data like event handlers, JS references and form values).

There are techniques to do DOM manipulations without so much slow childNodes walking. In particular, be aware of the possibilities of cloneNode, and using DocumentFragment. But sometimes innerHTML really is quicker. You can still get the best of both worlds by using innerHTML to write your basic structure with placeholders for attribute values and text content, which you then fill in afterwards using DOM. This saves you having to write your own escapehtml() function to get around the escaping/security problems mentioned above.

JavaScript DOM HTML, The easiest way to modify the content of an HTML element is by using the innerHTML property. The innerHTML property gets or sets the HTML or XML markup  You can use the <SCRIPT> and </SCRIPT> tags to include JavaScript code directly into an HTML file. In the example below, a JavaScript function called processOrder() is defined at the top of the HTML file.

You can change the innerHTML or outerHTML of an element on the page instead.

Writing HTML in Javascript | Javascript, In this tutorial we will learn about writing HTML using JavaScript. The way we're going to do this is by using the 'write' method on the 'document' object. to use document.write before the page has actually finished loading properly, and hence  JavaScript is primarily used to create interactive elements on a web page. Some of the most common uses of JavaScript are: Verifying data entered into a web form such as a sign-up or contact-us form. Updating information on a webpage without refreshing it. DOM (Document Object Model) scripting. This is a fairly advanced way to use JavaScript.

How to write html code dynamically using JavaScript?, Writing Your First JavaScript Program By itself, HTML doesn't have any smarts: has correctly filled out a form, and it can't make decisions based on how a web  To use JavaScript from an external file source, you need to write all your JavaScript source code in a simple text file with the extension ".js" and then include that file as shown above. For example, you can keep the following content in filename.js file and then you can use sayHello function in your HTML file after including the filename.js file.

Writing HTML in JS, You can add JavaScript code in an HTML document by employing the dedicated HTML tag <script> that wraps around JavaScript code. The <script> tag can be placed in the <head> section of your HTML, in the <body> section, or after the </body> close tag, depending on when you want the JavaScript to load. The HTML DOM allows JavaScript to change the content of HTML elements. In JavaScript, document.write () can be used to write directly to the HTML output stream: Never use document.write () after the document is loaded. It will overwrite the document. The easiest way to modify the content of an HTML element is by using the innerHTML property.

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