![]() ![]() This is because the pageX and pageY calculate the x and y values from the beginning of the web page, whereas the clientX and clientY calculate the values based on the visible part of the screen. The below screenshot illustrates this.Īfter scrolling the page, the values provided by the events pageX and pageY are larger than those provided by the events clientX and clientY. If you scroll the page and then check the values, there will be a difference in the values. We have not scrolled the page yet, so we are getting the same values. Seeing the output in the console, you will not see any difference as the pageX, and clientX are showing the same values, and the pageY and clientY are showing the same values. The below screenshot illustrates the output of the above code. Inside the mousemove() function, we just have console.log() the mouse values using event.pageX, event.pageY, and event.clientX, event.clientY. You can give whatever name to the mousemove() function, but you have to pass the exact event name to the event listener otherwise, it will not work. This event variable will provide the mouse’s updated x and y positions. This function takes event as an argument. In this case, we have created the function mousemove() and have passed it as a callback to the event listener. The second parameter is a function that will be executed after the event is triggered. This function takes two parameters, the first parameter is the event that we want to add. We have added a mousemove event to the window object using the addEventListener function in the script file. Window.addEventListener( 'mousemove', mousemove) 'clientX: ', event.clientX, 'clientY:', event.clientY) 'pageX: ', event.pageX, 'pageY: ', event.pageY, Let’s understand both these ways with the below example. ![]() Tracking Mouse Position Using PageX, PageY, and clientX, clientY in JavaScript ![]() If you want to track mouse position based on the screen’s visible area, use clientX and clientY.If you want to track mouse positions relative to the size of the webpage, use pageX and pageY. ![]() There are two different ways of getting these x and y positions of the mouse within the browser’s tab, and these ways are as follows. If you move the mouse horizontally, its x position will change, and if you move the mouse vertically, its y position will change. You might be aware that the top-left corner of the browser is represented with (0,0). To track the mouse position, we have to find its x-axis (horizontal position) and y-axis (vertical position) inside the browser’s tab. Various Ways of Tracking Mouse Events in JavaScript To see a full list of mouse events, you can visit the Mouse Events MDN docs. Greenfoot offers the class MouseInfo which represents the state of the mouse at a specific point in time.There are various mouse events available in JavaScript, out of which we will be focusing on the mousemove event as we want to track mouse position. Now for how to get the mouse coordinates: I recommend the second, because it makes updating the text on every frame easier. make your class extend World so that it is the world itself. Pass a reference to the world in the constructor to tell the object what world to show the text on, or So you need to call this method on a world instance (the instance to show the text on - there could be multiple worlds). „showText()“ is a method of the class World, more specifically greenfoot.World. You pass the value of getX and getY which are unchanged, so still 0 You call showText() even though there is no such method in that class. Two variables named getX and getY are declared but not initialized, so they are 0. Also, you don’t have to extend from Object, that happens automatically. First of all, you shouldn’t name your class „MouseInfo“ because that’s how the class from Greenfoot is named. ![]()
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