In JavaScript programming, we often encounter scenarios where we need to define specific functions that execute upon a button click. For instance, when conducting automation testing on a webpage or website, it's essential to explore additional functionalities. In these instances, utilizing the click event triggering method in JavaScript proves to be a dependable and effective approach to addressing the challenges mentioned.
In this section, we will explore the procedures associated with triggering click events in JavaScript.
How we can trigger click event in javascript:
To initiate the click event in JavaScript, we need to implement the following methods:
a) click method
b) addEventListener and dispathEvent methods
At this point, we will apply the techniques described previously to illustrate the following:
Method 1:
Trigger click event using click event method in javascript:
For the specified element, the click method is utilized to execute the action. By employing a user-defined function, this method can be implemented when the user clicks the designated button. This is achieved through the creation of the button, obtaining its identifier, and subsequently initiating the click event.
To provide additional clarity, let us examine the example presented below:
Example:
In the following example that includes the phrase "click here," a button will be generated with a designated ID, and a click event will be established to facilitate interaction with that button's click event;
<button type= "button" id= "btn" onclick= "clickEvent()">Click here</button>
To access the button that was created, we utilize the document.getElementById method by providing its id in JavaScript. Following this, we will trigger the click event to execute the subsequent operation.
const get= document.getElementById('btn');
get.click();
Finally, when the button is clicked, we will specify that the function named "clickEvent" should be executed, resulting in output being displayed on the console through the click method.
function clickEvent() {
console.log("now the Click Event is triggered ")
}
Based on the previous output generated from the relevant code, it has been noted that the button labeled "click here" has been activated through the automated application of the click method.
Method 2:
Trigger click event in javascript by the help of addEventListener and dispatchEvent method
In JavaScript, the fundamental approach is supplied by the JavaScript event target interface.
This method is utilized to register an event listener. When the specified event occurs on the target, we will invoke our designated function.
Syntax of the event:
target.addEventListener( $type, $listener);
target.addEventListener( $type, $listener, $options);
target.addEventListener( $type, $listener, $useCapture);
description of the syntax:
- In the above syntax, there is a parameter called $type , which is a mandatory parameter. Indicating the type of the event to be monitored, the parameters accept only one string. This parameter is a case-sensitive parameter. Various events are supported by it, such as keyboard, click, database, input, etc
- In the same manner, the $listener is a mandatory parameter also in it. A notification about the event is received by this parameter as an object when an event of the mentioned type has occurred. On the javascript function or on an Eventlistner interface, this object should be implemented.
- On the other hand, the $option is an optional parameter in it.
Example: 1
<button type="button" id="btn" onclick="openBingByMethod()">Open bing </button>
const link = document.getElementById('btn');
link.addEventListener('click', e => {});
for(let i = 0; i < 5; i++) {
link.dispatchEvent(new Event('click'));
}
function openGoogleByMethod() {
console.log("The required event is triggered")
}
Output:
"The required event is triggered".
"The required event is triggered".
"The required event is triggered".
"The required event is triggered".
"The required event is triggered".
Example 2:
In this scenario, we will begin by incorporating a button that has a specific id, which will be linked to an onclick event. This button will also carry a value identical to that of the previous example.
<button type= "button" id= "btn" onclick= "clickEvent()">Click here</button>
Subsequently, utilizing the addEventListener function, we will access the button and handle the click event associated with it. In this context, we will designate "e" as the parameter in the event listener, which represents the object pertaining to the click event.
const get = document.getElementById('btn');
get.addEventListener('click', e => {});
get.dispatchEvent(new Event('click'));
Ultimately, similar to the preceding approach, we will establish the click event to showcase the relevant message at the moment the click event is activated.
function clickEvent() {
console.log("The required event is triggered ")
}