Are you searching for “How to add JavaScript in HTML document?” If yes, then you have reached the right place to get the answer to your question!
In this article, we will see how we can create dynamic user interfaces for your web development project by including JavaScript code with your HTML file. With the help of JavaScript, you can make your websites or web apps more interactive and appealing.
So, let us take a dive into today’s agenda!
Still, if you have any doubts related toย JavaScript homeworkย then you can hire the best experts from CodingZap.
Summary Of The Article:
JavaScript is a well-liked and popular scripting language that is used on the client side of the web app or website.
It adds dynamicity and interactivity to your web pages, making them more responsive.
We can add JavaScript to our HTML code using two methods – internal script and external script.
To include JavaScript, we need to add the code within the <script> tags in our HTML file.
Methods To Add JavaScript In HTML File
HTML and JavaScript go hand in hand in modern web development projects. While HTML propers a basic structure to the website, JavaScript code adds a responsive touch to the HTML pages we have created.
But the question is, how can we include JavaScript code in our HTML files? Can you run JavaScript in an HTML file? Well, there are typically two methods to do this. These methods are given below:
Using internal script
Using an external script file
We need to write a script tag depending on the type of script. In case, we are using an external script file, we need to provide the src attribute that points to the source of our external JS script.
Now, let us discuss both of these methods with the help of coding examples. Read below to know more!
Method 1: Add JavaScript Code Using An Internal Script
The first way to include JavaScript in your HTML document is by adding it to the same HTML file. For this, we make use of the <script> and </script> tags. We can add the script tag in the head section or the body section.
Let us see the following code example to see how this works. The code will have a .html file extension. Look below!
HTML Code Example:
<!DOCTYPE html>
<html lang="en">
<head>
<title>
Hello World
</title>
<!-- Adding internal script-->
<script>
function showMessage(){
document. getElementById("text").innerHTML = "Hire our team of experts!";
}
</script>
<head>
<body>
<h1>Welcome to CodingZap!</h1>
<h3>Looking For Professional Programming Assigment Help?</h3>
<button type = "button" onclick = "showMessage()">
Clcik Here!
</button>
<h3 id = "text"></h3>
<script>var rocket_beacon_data = {"ajax_url":"https:\/\/codingzap.com\/wp-admin\/admin-ajax.php","nonce":"87b45b642d","url":"https:\/\/codingzap.com\/add-javascript-in-html-document","is_mobile":false,"width_threshold":1600,"height_threshold":700,"delay":500,"debug":null,"status":{"atf":true,"lrc":true},"elements":"img, video, picture, p, main, div, li, svg, section, header, span","lrc_threshold":1800}</script><script data-name="wpr-wpr-beacon" src='https://codingzap.com/wp-content/plugins/wp-rocket/assets/js/wpr-beacon.min.js' async></script><script>class RocketElementorAnimation{constructor(){this.deviceMode=document.createElement("span"),this.deviceMode.id="elementor-device-mode-wpr",this.deviceMode.setAttribute("class","elementor-screen-only"),document.body.appendChild(this.deviceMode)}_detectAnimations(){let t=getComputedStyle(this.deviceMode,":after").content.replace(/"/g,"");this.animationSettingKeys=this._listAnimationSettingsKeys(t),document.querySelectorAll(".elementor-invisible[data-settings]").forEach(t=>{const e=t.getBoundingClientRect();if(e.bottom>=0&&e.top<=window.innerHeight)try{this._animateElement(t)}catch(t){}})}_animateElement(t){const e=JSON.parse(t.dataset.settings),i=e._animation_delay||e.animation_delay||0,n=e[this.animationSettingKeys.find(t=>e[t])];if("none"===n)return void t.classList.remove("elementor-invisible");t.classList.remove(n),this.currentAnimation&&t.classList.remove(this.currentAnimation),this.currentAnimation=n;let s=setTimeout(()=>{t.classList.remove("elementor-invisible"),t.classList.add("animated",n),this._removeAnimationSettings(t,e)},i);window.addEventListener("rocket-startLoading",function(){clearTimeout(s)})}_listAnimationSettingsKeys(t="mobile"){const e=[""];switch(t){case"mobile":e.unshift("_mobile");case"tablet":e.unshift("_tablet");case"desktop":e.unshift("_desktop")}const i=[];return["animation","_animation"].forEach(t=>{e.forEach(e=>{i.push(t+e)})}),i}_removeAnimationSettings(t,e){this._listAnimationSettingsKeys().forEach(t=>delete e[t]),t.dataset.settings=JSON.stringify(e)}static run(){const t=new RocketElementorAnimation;requestAnimationFrame(t._detectAnimations.bind(t))}}document.addEventListener("DOMContentLoaded",RocketElementorAnimation.run);</script></body>
</html>
Let us see what is happening in this code example. We have created a button (specified by the type attribute) and a hidden message or new text is shown when the user clicks on it. This interaction is possible because of JavaScript.
Many of you wonder if can you call JavaScript functions in HTML. The answer is yes! In the head section, we have created the event handler function named showMessage(), and when it is called, the new text is displayed on the web page.
JavaScript is an event-driven programming language, thus, when the user interacts with the button HTML element, they get a response as well. The output will help us to get to know it better.
Output Before clicking on the button:
Output After clicking on the button:
Method 2: Add JavaScript Code Using An External Script File
Sometimes, our web project requires lengthy scripts. In this case, if we write the JavaScript code in the same code, it can get complicated. Therefore, we need to use external scripts for this purpose. This external JavaScript file can be used across multiple HTML documents to make the webpages interactive.
For adding JavaScript files externally, we need to specify the file path of the JS file. Thus, the script tag will also consist of the src attribute to get the path of the external JavaScript file we require.
Have a look at the following JavaScript code to see how a separate JavaScript file is added to an HTML page. Read the code below!
JavaScript Code Example:
function showMessage(){
document. getElementById("text").innerHTML = "CodingZap's team of experts is here to help you!";
}
The above is the JavaScript code that we’ll be adding into our HTML document. Here, we have an event handler that displays the text when the user interacts with the button. The file is named as script.js and this path is provided to our HTML code using the script src attribute.
HTML Code Example:
<!DOCTYPE html>
<html lang="en">
<head>
<title>
Hello World
</title>
<!-- Specifying the path to the JS script in the separate file-->
<script src = "script.js" data-rocket-defer defer>
</script>
<head>
<body>
<h1>Welcome to CodingZap!</h1>
<h3>Looking For Professional Programming Assigment Help?</h3>
<button type = "button" onclick = "showMessage()">
Clcik Here!
</button>
<h3 id = "text"></h3>
<script>var rocket_beacon_data = {"ajax_url":"https:\/\/codingzap.com\/wp-admin\/admin-ajax.php","nonce":"87b45b642d","url":"https:\/\/codingzap.com\/add-javascript-in-html-document","is_mobile":false,"width_threshold":1600,"height_threshold":700,"delay":500,"debug":null,"status":{"atf":true,"lrc":true},"elements":"img, video, picture, p, main, div, li, svg, section, header, span","lrc_threshold":1800}</script><script data-name="wpr-wpr-beacon" src='https://codingzap.com/wp-content/plugins/wp-rocket/assets/js/wpr-beacon.min.js' async></script></body>
</html>
This code is similar to the one we discussed above. However, we don’t have the JavaScript function to the script tag, instead we have the JS file path. Let’s also see the output for it to check if it works.
Output Before Clicking The Button:
Output After Clicking The Button:
In case youโre interested in knowing the process of using image tags in HTML, then you can check out our article.
Benefits Of Using External Scripts In An HTML Document
There are some benefits of using external script files instead of inline scripts. Some of them are mentioned below.
It provides a modular approach and separation of concerns making it easier to write and maintain HTML, CSS, and JS files.
It enables code reusability as these JavaScript files can be used with multiple HTML pages to perform specific tasks.
It facilitates easier debugging because of the isolation of the JavaScript files.
What Is The HTML noscript tag?
Let me now tell you about the <noscript> tag in HTML. It helps to tell the user that their web browsers do not support JavaScript or they have disabled scripts in their browser. Users can enable JavaScript in their browsers to run the website.
The syntax for it is given below.
<noscript>Please Enable JavaScript In Your Browser.</noscript>
The contents of this tag are displayed if the web browser cannot run JavaScript or the default scripting language.
Conclusion:
So, this is how we can add JavaScript to our HTML page. I hope that by now you have understood how you can get started with web development using HTML and JavaScript to add dynamicity and interactivity.
Then why don’t you try to create your own web page using HTML code? In case you feel stuck somewhere, you canย ask for HTML assignment help.
Takeaways:
JavaScript or JS is a client-side scripting language that is used for making interactive web pages.
We can include JavaScript in our HTML file using inline scripting or external scripting methods.
While inline JS can be used for shorter codes, it is beneficial to use external JavaScript for larger projects.
