how to implement mousemove while mouseDown pressed js

Use the mousemove event.

From mousemove and mouseover jquery docs:

The mousemove event is sent to an element when the mouse pointer moves inside the element.

The mouseover event is sent to an element when the mouse pointer enters the element.

Example: (check console output)

$(".floor").mousedown(function () {    $(this).mousemove(function () {        console.log("OK Moved!");    });}).mouseup(function () {    $(this).unbind('mousemove');}).mouseout(function () {    $(this).unbind('mousemove');});

https://jsfiddle.net/n4820hsh/

In pure javascript, you can achieve this with

function mouseMoveWhilstDown(target, whileMove) {    var endMove = function () {        window.removeEventListener('mousemove', whileMove);        window.removeEventListener('mouseup', endMove);    };    target.addEventListener('mousedown', function (event) {        event.stopPropagation(); // remove if you do want it to propagate ..        window.addEventListener('mousemove', whileMove);        window.addEventListener('mouseup', endMove);       });}

Then using the function along the lines of

mouseMoveWhilstDown(    document.getElementById('move'),    function (event) { console.log(event); });

(nb: in the above example, you don't need the function - you could call it as mouseMoveWhilstDown(document.getElementById('move'), console.log), but you might want to do something with it other than output it to the console!)

The default behaviour will stop mouseMove and mouseUp from running, you can solve this by basically adding event.preventDefault() to the mousedown function

please ensure that you use the same parameter name passed in the mousedown function to trigger the preventDefault() if not it will not work , in the example below i passed event as the parameter to the mousedown function and then triggered preventDefault() by typing event.preventDefault()

let sliderImages =  Array.from(document.getElementsByClassName('slidess'));const sliderPos = sliderImages.forEach( function (slide, index) {    let mousePosStart, isDown = false;    slide.addEventListener('mousedown', mousedown)    slide.addEventListener('mousemove', mousemove)    slide.addEventListener('mouseup', mouseup)function mousedown(event) {    if (isDown == false) {        mousePosStart = event.pageX - this.offsetLeft;        isDown = true;        event.preventDefault();    }}function mousemove(event) {    if (isDown == true) {        let mousePosMove = event.pageX - this.offsetLeft;    }}function mouseup(event) {    if (isDown === true) {        isDown = false;        let mousePosEnd = event.pageX - this.offsetLeft;    }}     

});