If implementing this sequence of events, remember that the mouseup event might be sent to a different HTML element than the mousemove event was. It is important, therefore, to optimize mousemove handlers as much as possible, and to unbind them as soon as they are no longer needed.Ī common pattern is to bind the mousemove handler from within a mousedown hander, and to unbind it from a corresponding mouseup handler. Answer: To determine the exact x and y coordinates of a mouse event, use the following properties: event.screenX, event.screenY (the screen x and y coordinates) event.clientX, event.clientY (coordinates relative to the top left corner of the browser window or frame). If the handler has to do any significant processing, or if multiple handlers for the event exist, this can be a serious performance drain on the browser.
#Javascript mouse coordinates code
This means that hundreds of events can be generated over a very small amount of time. Mouse Coordinates Not Math With Canvas Coordinates In Js With Code Examples In this article, the solution of Mouse Coordinates Not Math With Canvas. Keep in mind that the mousemove event is triggered whenever the mouse pointer moves, even for a pixel. These properties provide the X and Y coordinates of the mouse pointer relative to the top-left corner of the document, as illustrated in the example output above. pageY properties so that they can be used in all browsers.
pageX are available, but support for them differs between browsers. Move the mouse over the input field to see clientX/clientY (the example is in the iframe, so coordinates are relative to that iframe): tracking mouse movement, you usually need to know the actual position of the mouse pointer.
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