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How to Use Inline JavaScript in HTML: A Comprehensive Guide to Best Practices and Tips

Learn how to add, interpret, and call inline JavaScript in HTML with our comprehensive guide. Discover the benefits and best practices to optimize performance and maintainability.

• Adding Inline JavaScript to HTML
• Interpreting Inline JavaScript in HTML
• 1. JavaScript Programming: Introduction to Inline Scripts and Functions
• Calling Inline JavaScript from HTML
• Placing the Script Tag in HTML
• Best Practices for Using Inline JavaScript
• Other code snippets demonstrating how to use inline JavaScript in HTML
• Conclusion
• How to add JavaScript inline to HTML?
• How to use internal JS in HTML?
• Which HTML tag is used to write inline JavaScript?
• Can you inject JavaScript into HTML?

As web developers, we often use JavaScript to create dynamic and interactive web pages. One common way of using JavaScript in HTML is through inline scripts. In this comprehensive guide, we will discuss best practices and tips for using inline javascript in html .

Adding Inline JavaScript to HTML

Inline JavaScript is added to HTML using the tag. The tag can be placed anywhere within the or sections of an HTML document. However, it is recommended to place the tag at the bottom of the section to improve page loading times.

 
Welcome to my webpage
   

Inline JavaScript is useful for small code snippets because it eliminates the need to create a separate JavaScript file . However, for larger code, it is better to use external JavaScript files as they are easier to maintain and debug.

Interpreting Inline JavaScript in HTML

The code written between the tags is interpreted as JavaScript by the browser. The common syntax used in inline JavaScript is the same as in external JavaScript files.

To write clean and maintainable code , it is important to follow best practices. These include keeping the code minimal and optimizing it for performance. Avoid using global variables and function declarations inside inline scripts.

Here is an example of best practices for writing inline JavaScript:

 
Welcome to my webpage
   

1. JavaScript Programming: Introduction to Inline Scripts and Functions

It also demonstrates how to write and call a simple JavaScript It is assumed you already have Duration: 13:23

Calling Inline JavaScript from HTML

Inline JavaScript can be called from HTML using event handlers such as onclick , onload , and onsubmit . Event handlers are attributes on HTML elements that define a JavaScript function to be executed when the event occurs.

Here is an example of calling inline JavaScript from HTML:

While inline JavaScript can be convenient for small code snippets, it has some disadvantages. For example, it can make the HTML code harder to read and maintain. It can also lead to code duplication and decreased performance.

Placing the Script Tag in HTML

The placement of the tag in HTML can affect page loading times. The recommended practice is to place the tag at the bottom of the section to allow the HTML content to load first.

However, in some cases, it might be necessary to place the tag in the section. For example, if the JavaScript code needs to be executed before the HTML content is loaded.

Here is an example of placing the tag in the section:

   
Welcome to my webpage
  

Best Practices for Using Inline JavaScript

To ensure that inline JavaScript is clean and maintainable, it is important to follow best practices. These include:

• Keeping the code minimal
• Avoiding global variables and function declarations
• Using event handlers instead of inline JavaScript where possible
• Using external JavaScript files for larger code snippets
• optimizing the code for performance

Here is an example of best practices for using inline JavaScript:

By following best practices, you can ensure that your inline JavaScript code is clean, maintainable, and optimized for performance.

Other code snippets demonstrating how to use inline JavaScript in HTML

In Html case in point, Simple example of using inline javascript in html code sample

      
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in this example we saw how to use inline JavaScript or directly in an HTML tag.
  

Conclusion

Inline JavaScript is a useful tool for adding small code snippets to HTML. However, it is important to follow best practices to ensure that the code is clean, maintainable, and optimized for performance.

In general, it is recommended to use external JavaScript files for larger code snippets. This makes the code easier to maintain and debug.

By following the best practices outlined in this guide, you can ensure that your inline JavaScript code is of high quality and provides a great user experience.

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How to include inline JavaScript inside an HTML page?

In this tutorial, we will learn how to include inline JavaScript inside an HTML page.

Include inline JavaScript using onclick Event

Just like an alert message showing up from the inline JavaScript inside an HTML page, we can also declare a function and call it. This method enabled us to write multiline code inside of a JavaScript function to do more tasks than just an alert message showing. In this example, we will change an element’s text and background color by invoking a function from inline JavaScript code.

Users can follow the syntax below to include inline JavaScript inside an HTML page to invoke a function.

Syntax

// inline JavaScript within the onclick attribute of a button  Click Me 

In the above syntax, we declared an anonymous function, and to enable the call of this anonymous function, we wrap it in between parenthesis and then call it by opening and closing parenthesis.

Example

In the below example, we have included inline JavaScript inside an HTML page to invoke a function. We have used a function to change the text of the «root» element. We set up this function on a click event of a button, «Change Text», so when the user use that button, the text of the «root» element will change. Similarly, we set up two more buttons with click events. The «Change Background» button is used to change the background color, and the «Reset Changes» button is used to reset all the changes to the «root» element.

html> body> p>Including inline JavaScript inside an HTML page to invoke a function/p> div> button type = "button" onclick ="(function() // JavaScript Code to Change the Inner Text const root = document.getElementById('root') root.innerHTML = 'This Text is Changed By Inline JavaScript!' >)()"> Change Text /button> button type = "button" onclick = "(function() // JavaScript Code to Change the Background Color const root = document.getElementById('root') root.style.backgroundColor = '#85f8d5' >)()"> Change Background /button> button type = "button" onclick = "(function() // JavaScript Code to Rest the Changes const root = document.getElementById('root') root.innerHTML = 'Welcome to Tutorialspoint!' root.style.backgroundColor = '#ffffff' >)()"> Reset Changes /button> /div> div id="root" style="border: 1px solid black; margin-top: 10px; padding: 10px;">Welcome to Tutorialspoint!/div> /body> /html> 
 

Using Inline JavaScript to Show an Alert Message

One of the simplest ways to understand the workings of JavaScript is by using the alert method. The alert method opens a pop-up window containing a message. We will use that alert method in inline JavaScript code in this example. The inline JavaScript code always needs to be written in between an event attribute, so whenever that event is triggered, the inline JavaScript code will execute.

Users can follow the syntax below to include inline JavaScript inside an HTML page to alert a message.

Syntax

// inline JavaScript within the onclick attribute of a button Click Me 

In the above syntax, «welcome» is the alert message. The alert message will be shown whenever the user clicks on the button.

Example

In the below example, we have included inline JavaScript inside an HTML page to alert a message. We have used multiple elements to have the click event for showing different alert messages.

html> body> p>Including inline JavaScript inside an HTML page to show i>alert/i> messages/p> button type = "button" onclick = "alert('Welcome to Tutorialspoint')"> Click Me /button> p style="border: 1px solid black; padding: 10px;" onclick="alert('Hi from p tag!')">'p' tag/p> div style="border: 1px solid black;padding: 10px;" onclick="alert('Hi from div tag!')">'div' tag/div> /body> /html> 
 

In this tutorial, we learned how to include inline JavaScript inside an HTML page. We have seen how we can alert a message using inline JavaScript, and we also code it in the example and use multiple alert messages for multiple-element click events. We have also seen how we can execute or invoke a function in the inline JavaScript.

In the example of this method, we change the inner text and background color and reset them by using click events of multiple buttons. So inline JavaScript can be a useful thing for quick writing the JavaScript code, but for large applications, it will not be the best way to include JavaScript code because it can have multiple repetitive codes, and managing the application can be hard.

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