Html button onclick src

How to use an HTML button to call a JavaScript function?

We use the onclick event attribute property of the HTML button to call a JavaScript function. The JavaScript code provided in the onclick attribute executes when the button is clicked. There are various attributes provided with the button tag in HTML that allows us to customize the button’s functionality and also let us decide how and what the button triggers.

Approach 1: Using the onclick event in JavaScript

The onclick event of the button element expects JavaScript code that is triggered when the button is clicked upon. So we put the function that needs to be called in the onclick property as well.

Syntax

This creates an HTML button with the name «click me» and triggers the «fun()» function.

Example 1

Here we will use an HTML button to call a JavaScript function. The associated function body executes when the button is clicked. Let’s look at the code for same.

!DOCTYPE html> html> title>Online Javascript Editor/title> head> /head> body> script> function fun()  document.getElementById("result").innerHTML = "The function fun() is triggered !"; > /script> Calling js function using HTML button br>br> button onclick = "fun()"> click me !/button> p> div id = "result"> /div> /p> /body> /html> 
 

In the above code, The function fun() is triggered when the button is clicked.

Approach 2: Using the ondblclick event in JavaScript

More options are provided to customize the execution of the JavaScript functions in different ways. for example, we can also set the function to be called only when the button is double-clicked. This can be done with the «ondblclick» event of the button tag.

Syntax

This creates an HTML button with the name «Button_Name» and triggers the «fun()» function when the button is double-clicked.

Example 2

Here we will use an HTML button to call a JavaScript function. The associated function body executes when the button is double-clicked.

!DOCTYPE html> html> title>Online Javascript Editor/title> head> /head> body> script> function fun()  document.getElementById("result").innerHTML = "The function fun() is triggered !"; > /script> h3>Calling js function using HTML button br>/h3> p> Double click "click me!" button /p> button ondblclick = "fun()"> click me ! /button> p> div id = "result"> /div> /p> /body> /html> 
 

In the above code, we have the «click me» button that triggers the fun() function when it is double clicked.

Approach 3: Using the onclick event of an input button

Buttons can also be part of forms that do some sort of validation and form submission. Buttons can also be created using the input tag provided by HTML. The onclick event attribute is again configured to handle the behavior of the button.

Syntax

This creates an HTML button with the name «Button_Name» and triggers the «fun()» function.

Let us look at an example to see this use case.

Example 3

We will create a button for submitting a mock form, this button triggers the JavaScript function provided in the onclick property.

!DOCTYPE html> html> title>Online Javascript Editor/title> head> /head> body> script> function fun()  document.getElementById("result").innerHTML = "The function fun() is triggered !"; > /script> Calling js function using HTML button br>br> form> label> Name : /label> input type = "text"> /input>br>br> input type = "button" onclick = "fun()" value = "submit"> /form> p> div id = "result"> /div> /p> /body> /html> 
 

In the above code, The function fun() is triggered when the submit button is clicked.

Approach 4: Using jQuery

As an alternative we can also use jQuery to attach the function to the button programmatically.

Syntax

This jQuery script checks for the readiness of the document and then attaches the function fun() to the click of the button having id as «Your_Button».

Let us look at an example to see this use case.

Example 4

We will create a HTML button and attach an event handler «onclick» to it programmatically using jQuery. Note that this attachment happens after the complete document has been rendered successfully.

The script in head tag imports the jQuery.

!DOCTYPE html> html> title>Online Javascript Editor/title> head> script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js">/script> /head> body> Calling js function using HTML button br>br> button id="button"> click me !/button> p> div id="result"> /div> /p> script> $(document).ready(function()  $('#button').click(function()  fun(); >); >); function fun()  document.getElementById("result").innerHTML = "The function fun() is triggered !"; > /script> /body> /html> 
 

Conclusion

The onclick property of HTML buttons are a fast and effective way of attaching JavaScript functions to them.

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How to Make Button onclick in HTML

The onclick attribute is an event attribute that is supported by all browsers. It appears when the user clicks on a button element. If you want to make a button onclick, you need to add the onclick event attribute to the element.

How to add URL to the window object

The button onclick runs a script when the user clicks a button. Let’s see an example where we have a button, clicking on which you’ll go to our website. To achieve this, we’ll just add the URL of the website to the window object.

Example of adding URL to the window object:

html> html> head> title>Title of the document title> head> body> button onclick="window.location.href='https://w3docs.com';">Click Here button> body> html>

You can also use a button onclick in order to know the current date just by adding «getElementById(‘demo’).innerHTML=Date()» to the onclick event.

Example of using a button onclick to know the current date:

html> html> head> title>Title of the document title> head> body> p>Click the button to see the current date. p> button onclick="getElementById('demo').innerHTML=Date()">What day is today? button> p id="demo"> p> body> html>

The onclick event is used to call a function when an element is clicked. That is why it is mostly used with the JavaScript function. Let’s consider an example where you need to click the button to set a function that will output a message in a element with id=»demo».

Example of adding an onclick event:

html> html> head> title>Title of the document title> head> body> p>There is a hidden message for you. Click to see it. p> button onclick="myFunction()">Click me! button> p id="demo"> p> script> function myFunction( ) < document.getElementById("demo").innerHTML = "Hello Dear Visitor!
 We are happy that you've chosen our website to learn programming languages. We're sure you'll become one of the best programmers in your country. Good luck to you!"; > script> body> html>

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How to Add an HTML Button that Acts Like a Link

There are several ways of creating an HTML button, that acts like a link (i.e., clicking on it the user is redirected to the specified URL). You can choose one of the following methods to add a link to the HTML button.

Add an inline onclick event

You can add an inline onclick event to the tag.

Example of adding an onclick event to the tag:

html> html> head> title>Title of the document title> head> body> button onclick="window.location.href='https://w3docs.com';"> Click Here button> body> html>

It is also possible to add an inline onclick event to the tag within the element.

Example of adding an onclick event to the tag:

html> html> head> title>Title of the document title> head> body> form> input type="button" onclick="window.location.href='https://www.w3docs.com';" value="w3docs" /> form> body> html>

Use the action or formaction attribute.

Another way of creating a button that acts like a link is using the action or formaction attribute within the element.

Example of creating a button acting like a link with the action attribute:

html> html> head> title>Title of the document title> head> body> form action="https://www.w3docs.com/"> button type="submit">Click me button> form> body> html>

To open the link in a new tab, add target=»_blank» .

Example of opening a link from a button in a new window:

html> html> head> title>Title of the document title> head> body> form action="https://www.w3docs.com/" method="get" target="_blank"> button type="submit">Click me button> form> body> html>

Since there is no form and no data is submitted, this may be semantically incorrect. However, this markup is valid.

Example of creating a button acting like a link with the formaction attribute:

html> html> head> title>Title of the document title> head> body> form> button type="submit" formaction="https://www.w3docs.com">Click me button> form> body> html>

The formaction attribute is only used with buttons having type=»submit» . Since this attribute is HTML5-specific, its support in old browsers may be poor.

Style the link as a button

Add a link styled as a button with CSS properties. A href attribute is the required attribute of the tag. It specifies a link on the web page or a place on the same page where the user navigates after clicking on the link.

Example of styling a link as a button with CSS:

html> html> head> title>Title of the document title> style> .button < background-color: #1c87c9; border: none; color: white; padding: 20px 34px; text-align: center; text-decoration: none; display: inline-block; font-size: 20px; margin: 4px 2px; cursor: pointer; > style> head> body> a href="https://www.w3docs.com/" class="button">Click Here a> body> html>

Let’s see one more example.

Example of styling a link as a button and adding a hover effect:

html> html> head> title>Title of the document title> style> .button < display: inline-block; padding: 10px 20px; text-align: center; text-decoration: none; color: #ffffff; background-color: #7aa8b7; border-radius: 6px; outline: none; transition: 0.3s; > .button:hover < background-color: #c2c7c7; > style> head> body> a class="button" href="https://www.w3docs.com/learn-html/html-button-tag.html">HTML button tag a> body> html>

How about the accessibility?

Let’s take accessibility into our account for the last example. Here are some improvements to make the code more accessible:

If the button contained an image, it would be important to provide an alt attribute to make the image accessible to screen readers. Since this button doesn’t have an image, we don’t need to worry about this.

Adding a label to the button will help users who rely on assistive technology understand the purpose of the button. We can do this by wrapping the button text in a element and adding an aria-label attribute to the button.

To improve visibility for users with low vision, we can increase the contrast between the text color and background color of the button. We can achieve this by making the background color darker or the text color lighter.

Adding a focus style to the button will help users who navigate using the keyboard to see which element is currently focused. We can add a simple border to the button to achieve this.

Here’s the updated code with these improvements:

html> html> head> title>Title of the document title> style> .button < display: inline-block; padding: 10px 20px; text-align: center; text-decoration: none; color: #ffffff; background-color: #3c5d6e; border-radius: 6px; outline: none; transition: 0.3s; border: 2px solid transparent; > .button:hover, .button:focus < background-color: #c2c7c7; border-color: #7aa8b7; > style> head> body> a class="button" href="https://www.w3docs.com/learn-html/html-button-tag.html" aria-label="Learn about the HTML button tag">span>HTML button tag span> a> body> html>

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