Event object in DOM

Introducing the Event object into DOM (the DOM browser is the standard browser)

(1) Pass the event through the event attribute of the HTML mark Object

In the DOM, the event object is passed to the function as a parameter when the event calls the function.

The event parameter is a fixed writing method of the system. It is all lowercase and cannot be quoted. It is the event object parameter.

<!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>php.cn</title>
        <script type="text/javascript">
            //在HTML中，如何通过事件来传递event对象参数
            function get(e){
                //获取单击时，距离窗口左边和上边的距离
                alert(e.clientX+","+e.clientY);
            }     
        </script>
    </head>
    <body style="margin:0px">
        <img width="400" src="/upload/course/000/000/009/580af7f52278b486.jpg" onclick="get(event)" />
    </body>
</html>

(2) Use the event attribute of the element object to pass the event object

<!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>php.cn</title>
        <script type="text/javascript">
            window.onload = function(){
                //获取id=img1的图片对象
                var imgObj=document.getElementById("img1");
                //增加onclick事件
                imgObj.onclick=get;
            }
            //不能传event参数，但形参必须接收
            //第一个形参，一定是event对象
            function get(e){
                //获取单击时，距离窗口左边和上边的距离
                alert(e.clientX+","+e.clientY);
            }    
        </script>
    </head>
    <body style="margin:0px">
        <img id="img1" width="400" src="/upload/course/000/000/009/580af7f52278b486.jpg" />
    </body>
</html>

##Event object properties in DOM

type: the current event type
clientX and clientY: distance from the left and top of the window
pageX and pageY: distance from the left and top of the web page
screenX and screenY: distance from the left and top of the screen

<!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>php.cn</title>
        <script type="text/javascript">
            function get(e)
            {
                //获取单击时，相关坐标信息
                var str = "窗口左边距离："+e.clientX+"，窗口顶边距离："+e.clientY;
                str += "\n网页左边距离："+e.pageX+"，网页顶边距离："+e.pageY;
                str += "\n屏幕左边距离："+e.screenX+"，屏幕顶边距离："+e.screenY;
                str += "\n事件类型："+e.type;
                window.alert(str);
            }    
        </script>
    </head>
    <body style="margin:0px">
        <img id="img1" width="400" src="/upload/course/000/000/009/580af7f52278b486.jpg" onclick="get(event)" />
    </body>
</html>

Continuing Learning

new file

<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>php.cn</title> <script type="text/javascript"> //在HTML中，如何通过事件来传递event对象参数 function get(e){ //获取单击时，距离窗口左边和上边的距离 alert(e.clientX+","+e.clientY); } </script> </head> <body style="margin:0px"> <img width="400" src="/upload/course/000/000/009/580af7f52278b486.jpg" onclick="get(event)" /> </body> </html>

submit Reset Code

Automatic operation

Event object in DOM

ElementaryImperial CMS enterprise imitation website tutorial

ElementaryNewbies with zero foundation in WordPress build personal blogs and corporate websites

ElementaryUltimate CMS zero-based website building instruction video

ElementaryFront-end project-Shangyou [HTML/CSS/JS technology comprehensive practice]

IntermediateVue3.0 from 0 to build a universal backend management system project practice

ElementaryZero-based front-end course [Vue advanced learning and practical application]

ElementaryWEB front-end tutorial [HTML5+CSS3+JS]

ElementaryQuick introduction to apipost

IntermediateVue3+TypeScript practical tutorial-enterprise-level project practice

ElementaryLet's briefly talk about starting a business in PHP

IntermediateVUE e-commerce project (front-end & back-end dual project actual combat)

ElementaryApipost practical application [api, interface, automated testing, mock]