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Introduction to JavaScript mousedown

JavaScript provides support for various types of events including mouse events. The mousedown is such one kind of mouse event which is supported by JavaScript. The mousedown event can be applied to the element and is triggered whenever the left button of the mouse is pressed over that element. This left button press can be emulated by other types of peripherals such as a touchpad, screen displays, etc and this can also create a mousedown event. When the mousedown event occurs over the element, we can attach a function to execute after it. This event is often used along with the mouseup event where the button is released which is the opposite of mousedown event.

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Syntax:

HTML:

JavaScript:

elementObj.onmousedown = function () {

Using addEventListener() method in JavaScript:

elementObj.addEventListener("onmousedown" , function() { How mousedown Event work in JavaScript?

The mousedown event gets fired immediately the left button is pressed initially.

Examples of JavaScript mousedown

Given below are the examples mentioned:

Example #1

In HTML.

Code:

Output:

Before Event occurs:

After Event occurs:

Example #2

In JavaScript.

Code:

Output:

Before Event occurs:

After Event occurs:

Example #3

In JavaScript using eventListener() method.

Code:

Output:

Before Event occurs:

Example #4

Different operations on different types of elements.

Code:

JavaScript onmousedownEvent .body-data { border : #81D4FA 2px solid; background-color : #03a9f400; text-align : left; padding-left : 20px; padding-bottom: 20px; height : auto; width : auto; } .resultText { margin: 0 0 3px 0; padding: 0px; display: block; font-weight: bold; } .heading { font-weight: bold; border-bottom: 2px solid #ddd; font-size: 15px; width: 98%; } function changeColor() { document.getElementById( “color” ).style.color = “Red”; } document.getElementById( “myText” ).onmousedown = function() { document.getElementById( “myText”).innerHTML = ” Text is changed “; } document.getElementById( “hideText”).addEventListener( “mousedown” , function() { toggleDisplay(); }) function toggleDisplay( ) { var property = document.getElementById( “hideText” ); if ( property.style.display === ‘block’) { property.style.display = ‘none’; } else { property.style.display = ‘block’; } }

Output:

Before Event Occurs:

After Event Occurs:

Conclusion

The onmousedown is a subtype of mouse events that are available in JavaScript. The mousedown event occurs when the left button of the mouse is pressed on the element. It is possible to perform multiple types of operations upon the occurrence of a mousedown event.