Title

How To Add JavaScript to HTML

JavaScript, also abbreviated to JS, is a programming language used in web development. As one of the core technologies of the web alongside HTML and CSS, JavaScript is used to make webpages interactive and to build web apps. Modern web browsers, which adhere to common display standards, support JavaScript through built-in engines without the need for additional plugins.

When working with files for the web, JavaScript needs to be loaded and run alongside HTML markup. This can be done either inline within an HTML document or in a separate file that the browser will download alongside the HTML document.

This tutorial will go over how to incorporate JavaScript into your web files, both inline into an HTML document and as a separate file.

Adding JavaScript into an HTML Document

You can add JavaScript code in an HTML document by employing the dedicated HTML tag that wraps around JavaScript code.

The tag can be placed in the section of your HTML or in the section, depending on when you want the JavaScript to load.

Generally, JavaScript code can go inside of the document section in order to keep them contained and out of the main content of your HTML document.

However, if your script needs to run at a certain point within a page’s layout — like when using document.write to generate content — you should put it at the point where it should be called, usually within the section.

Let’s consider the following blank HTML document with a browser title of Today’s Date :

DOCTYPE html> html lang="en-US"> head> meta charset="UTF-8"> meta name="viewport" content="width=device-width, initial-scale=1"> title>Today's Datetitle> head> body> body> html> 

Right now, this file only contains HTML markup. Let’s say we would like to add the following JavaScript code to the document:

let d = new Date(); alert("Today's date is " + d); 

This will enable the webpage to display an alert with the current date regardless of when the user loads the site.

In order to achieve this, we will add a tag along with some JavaScript code into the HTML file.

To begin with, we’ll add the JavaScript code between the tags, signalling the browser to run the JavaScript script before loading in the rest of the page. We can add the JavaScript below the tags, for instance, as shown below:

DOCTYPE html> html lang="en-US"> head> meta charset="UTF-8"> meta name="viewport" content="width=device-width, initial-scale=1"> title>Today's Datetitle> script> let d = new Date(); alert("Today's date is " + d); script> head> body> body> html> 

Once you load the page, you will receive an alert similar to this:

If we were modifying what is shown in the body of the HTML, we would need to implement that after the section so that it displays on the page, as in the example below:

DOCTYPE html> html lang="en-US"> head> meta charset="UTF-8"> meta name="viewport" content="width=device-width, initial-scale=1"> title>Today's Datetitle> head> body> script> let d = new Date(); document.body.innerHTML = "Today's date is " + d + ">" script> body> html> 

The output for the above HTML document loaded through a web browser would look similar to the following:

Scripts that are small or that run only on one page can work fine within an HTML file, but for larger scripts or scripts that will be used on many pages, it is not a very effective solution because including it can become unwieldy or difficult to read and understand. In the next section, we’ll go over how to handle a separate JavaScript file in your HTML document.

Working with a Separate JavaScript File

In order to accommodate larger scripts or scripts that will be used across several pages, JavaScript code generally lives in one or more js files that are referenced within HTML documents, similarly to how external assets like CSS are referenced.

The benefits of using a separate JavaScript file include:

• Separating the HTML markup and JavaScript code to make both more straightforward
• Separate files makes maintenance easier
• When JavaScript files are cached, pages load more quickly

To demonstrate how to connect a JavaScript document to an HTML document, let’s create a small web project. It will consist of script.js in the js/ directory, style.css in the css/ directory, and a main index.html in the root of the project.

project/ ├── css/ | └── style.css ├── js/ | └── script.js └── index.html 

We can start with our previous HTML template from the section above:

DOCTYPE html> html lang="en-US"> head> meta charset="UTF-8"> meta name="viewport" content="width=device-width, initial-scale=1"> title>Today's Datetitle> head> body> body> html> 

Now, let’s move our JavaScript code that will show the date as an header to the script.js file:

let d = new Date(); document.body.innerHTML = "
Today's date is " + d + "
" 

We can add a reference to this script to the section, with the following line of code:

script src="js/script.js">/script> 

The tag is pointing to the script.js file in the js/ directory of our web project.

Let’s consider this line in the context of our HTML file, in this case, within the section:

DOCTYPE html> html lang="en-US"> head> meta charset="UTF-8"> meta name="viewport" content="width=device-width, initial-scale=1"> title>Today's Datetitle> head> body> script src="js/script.js">script> body> html> 

Finally, let’s also edit the style.css file by adding a background color and style to the header:

body  background-color: #0080ff; > h1  color: #fff; font-family: Arial, Helvetica, sans-serif; > 

We can reference that CSS file within the section of our HTML document:

DOCTYPE html> html lang="en-US"> head> meta charset="UTF-8"> meta name="viewport" content="width=device-width, initial-scale=1"> title>Today's Datetitle> link rel="stylesheet" href="css/style.css"> head> body> script src="js/script.js">script> body> html> 

Now, with the JavaScript and CSS in place we can load the index.html page into the web browser of our choice. We should see a page that looks similar to the following:

Now that we’ve placed the JavaScript in a file, we can call it in the same way from additional web pages and update them all in a single location

Conclusion

This tutorial went over how to incorporate JavaScript into your web files, both inline into an HTML document and as a separate .js file.

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Tutorial Series: How To Code in JavaScript

JavaScript is a high-level, object-based, dynamic scripting language popular as a tool for making webpages interactive.

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Html create a script tag from inside script

You can try this though, perhaps it will get you an idea on how to work with javascript in combination with html: Solution 2: html tags such as should be put outside of a JavaScript function and inside the html’s tag. Solution 3: Here is a very interesting solution to your problem: http://24ways.org/2005/have-your-dom-and-script-it-too So use this instead of script tags: Solution 1: I recommend to use handlebars but it also can be done with pure js/jquery: I put the content of your script tag in a dynamically created div and at this moment it behaves like normal DOM Solution 2: You can do like this: Here, in the the desired alement can be added/assigned/appended.

Can I write a <script> tag inside a <script> tag

Explanation [update]:

When you use a HTML tag inside a quoted (literal) string, the tag is treated as a closing tag rather than as a portion of the string. So you cannot directly use the tag inside a script section.

One work-around is to escape the tags and/or split up the

JavaScript Where To, You can place any number of scripts in an HTML document. Scripts can be placed in the , or in the section of an HTML page, or in both

Script Tag in JavaScript - Insert JavaScript Into HTML

The script tag is the primary method to insert JavaScript into the HTML page. The script tag
Duration: 9:27

JavaScript - Script Tag #02

Missing: inside | Must include:

HTML code inside <Script> tag

As the comments state.. That is not how you should go about.. You can try this though, perhaps it will get you an idea on how to work with javascript in combination with html:

  = 0 || chance<=50)< container.innerHTML = ''; > else < container.innerHTML = ''; > >   

html tags such as should be put outside of a JavaScript function and inside the html's tag.

First, you want to query your video element with getElementById . In both scenarios, we are creating a source element, so we can declare that outside of the conditional block.

We can set attributes such as src and type with the setAttribute function. We can then add the source element as a child to the video element with the appendChild function.

 function myFunction() < var video = document.getElementById("my-video"); var source = document.CreateElement("source"); source.setAttribute("type", "video/webm"); var chance = (( Math.random()*100)+1) if (chance >= 0 || chance else < var iframe = document.createElement("iframe"); iframe.setAttribute("width", "420"); iframe.setAttribute("height", "315"); video.appendChild("iframe"); source.setAttribute("src", "https://www.youtube.com/embed/IdtKbq30mkw"); iframe.appendChild(source"); >> 

Since you didn't tag this with jQuery, I'll assume you aren't looking to use it. You can still use "templates" though, even without it:

Put each template in a script tag with type="text/template":

   Then in your javascript load the correct one based on your logic:

var iframe = document.getElementById("withIframe").innerHTML; var noiframe = document.getElementById("withoutIframe").innerHTML; function myFunction() < var chance = ((Math.random() * 100) + 1); var output = ''; if (chance else < output = iframe; >document.getElementById("holder").innerHTML = output; > myFunction(); 

Note, there were some typos in your HTML and you condition would always return true:

All positive numbers are greater than 0 or less than 50.

Here is a working fiddle: https://jsfiddle.net/mcgraphix/5cr4j1r7/

For more complex templates where you can pass data in to populate your template, you may want to look at Mustache or Handlebars.

HTML code inside tag, First, you want to query your video element with getElementById . In both scenarios, we are creating a source element, so we can declare that

Can scripts be inserted with innerHTML?

Here is a method that recursively replaces all scripts with executable ones:

function nodeScriptReplace(node) < if ( nodeScriptIs(node) === true ) < node.parentNode.replaceChild( nodeScriptClone(node) , node ); >else < var i = -1, children = node.childNodes; while ( ++i < children.length ) < nodeScriptReplace( children[i] ); >> return node; > function nodeScriptClone(node) < var script = document.createElement("script"); script.text = node.innerHTML; var i = -1, attrs = node.attributes, attr; while ( ++i < attrs.length ) < script.setAttribute( (attr = attrs[i]).name, attr.value ); >return script; > function nodeScriptIs(node)

Example call:

nodeScriptReplace(document.getElementsByTagName("body")[0]); 

You have to use eval() to execute any script code that you've inserted as DOM text.

MooTools will do this for you automatically, and I'm sure jQuery would as well (depending on the version. jQuery version 1.6+ uses eval ). This saves a lot of hassle of parsing out tags and escaping your content, as well as a bunch of other "gotchas".

Generally if you're going to eval() it yourself, you want to create/send the script code without any HTML markup such as , as these will not eval() properly.

Here is a very interesting solution to your problem: http://24ways.org/2005/have-your-dom-and-script-it-too

So use this instead of script tags:

Can scripts be inserted with innerHTML?, Adding a script tag with innerHTML is much shorter than creating a script DOM element and adding it to the body, and I am trying to make my code as short as

How to put html inside script tag and show it using jquery

I recommend to use handlebars but it also can be done with pure js/jquery:

I put the content of your script tag in a dynamically created div and at this moment it behaves like normal DOM

Here, in the body the desired alement can be added/assigned/appended.

Use handlebars.js to create template. Bind it to json data after compilation. Then, you can show html. You can also use other templating libraries like mustache.js, underscore.js template etc.

The code below is from http://handlebarsjs.com

This defined the template. Then, you can use it as shown below.

Button tag is not working inside script tag, 2 Answers 2 You should get the button out of the script tag. it should look like this. The button shouldn't be inside the script tag. Put it

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