A JavaScript can be executed when an event occurs, the user clicks on any HTML tag elements. In HTML, we can use the onclick attribute and assign a JavaScript function to it. Now, about in the function getting image src by id using JavaScript document.getElementById (). So, there are we pass one parameter in the JavaScript function using the Html button onClick function. The onclick event generally occurs when the user clicks on an element. Given multiple functions, the task is to call them by just one onclick event using JavaScript. The below code does that. Javascript Web Development Front End Technology The onClick event is the most frequently used event type, which occurs when a user clicks the left button of the mouse. © Copyright 2011-2018 www.javatpoint.com. A user clicking a button, submitting a form, or pressing a key on their keyboard are all examples of events in action. Here's the code: Please keep in mind that that full line of code should all go onto one line. Up to now, we have used a simple element attribute way for the onClick() event. Here are few methods discussed. Infact, you can use this methodology add/change JavaScript function for almost any event and on elements which support such events. Either we can call them by mentioning their names with element where onclick event occurs or first call a single function and all the other functions are called inside that function. If we will use multiple statements in a onClick() event we have to delimit the statements with ;. Example: Javascript DOM for Event Handling. The function receives a MouseEvent object as its sole argument. ELEMENT is generally a button or similar type element where the user will click on it. JavaScript also provides the Ajax feature to communicate with the server on a specified path, which helps achieve our goal. This one is the implementation of JavaScript function in onclick. On clicking the paragraph, the background color and font-size of elements will also change. New replies are no longer allowed.

Output: In the above example, we have created the javascript function additionally when the user clicks the button “click” it will display the value “Welcome” in the browser itself. Calculate current week number in JavaScript, Calculate days between two dates in JavaScript, How to Convert Comma Separated String into an Array in JavaScript, How to create dropdown list using JavaScript, How to disable radio button using JavaScript, How to add a class to an element using JavaScript, How to calculate the perimeter and area of a circle using JavaScript, How to find factorial of a number in JavaScript, How to get the value of PI using JavaScript, How to make a text italic using JavaScript, How to get all checked checkbox value in JavaScript, How to add object in array using JavaScript, How to check a radio button using JavaScript, JavaScript function to check array is empty or not, Implementing JavaScript Stack Using Array, Event Bubbling and Capturing in JavaScript, How to select all checkboxes using JavaScript, How to add a WhatsApp share button in a website using JavaScript, How to Toggle Password Visibility in JavaScript. Using the event handler onClick is the most frequently used in form, or elsewhere to trigger event handler function on click events. Example 1: This example simply put the argument which is string in the onClick attribute of the button which calls a function with a string as an argument using onClick… When the user clicks on the paragraph element, the corresponding function will get executed, and the text of the paragraph gets changed. This HTML element is generally a button but it can be also ahead, iframe, label element, etc. If any anonymous function to the HTML elements … You could make a form visible when the user clicks a button, or display a message to a user when they submit a form. In this example, we are using JavaScript's addEventListener() method to attach a click event to the paragraph element. But if there is a single statement ; is optional where we can use or not. The < a href> onclick triggering JavaScript function that throws an alert.

The onclick event is used to trigger a function when an element is clicked on.

Click the button to trigger a function that will output "Hello World" in a p element with id="demo".