This article describes the method of JS to achieve mouse box selection effect. Share it for your reference, as follows:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title> Mouse box selection effect</title><style> *{ padding:0; margin:0; } #bottom{ position:absolute; bottom:0px; width:100%; height:40px; border:1px solid #000; background:#000; color:#fff; } .tempDiv{ border:1px dashed blue; background:#5a72f8; position:absolute; width:0; height:0; filter:alpha(opacity:10); opacity:0.1 }</style><script type = "text/javascript"> window.onload = function(){ var stateBar = document.getElementById("bottom"); document.onmousedown = function(e){ var posx = e.clientX; var posy = e.clientY; var div = document.createElement("div"); div.className = "tempDiv"; div.style.left = e.clientX+"px"; div.style.top = e.clientY+"px"; document.body.appendChild(div); document.onmousemove = function(ev){ div.style.left = Math.min(ev.clientX, posx) + "px"; div.style.top = Math.min(ev.clientY, posy) + "px"; div.style.width = Math.abs(posx - ev.clientX)+"px"; div.style.height = Math.abs(posy - ev.clientY)+"px"; stateBar.innerHTML = "MouseX: " + ev.clientX + "<br/>MouseY: " + ev.clientY; document.onmouseup = function(){ div.parentNode.removeChild(div); document.onmousemove = null; document.onmouseup = null; } } }}</script></head><body> <div id = "bottom"></div></body></html>For more information about JavaScript related content, please check out the topics of this site: "Summary of JavaScript switching effects and techniques", "Summary of JavaScript search algorithm skills", "Summary of JavaScript animation effects and techniques", "Summary of JavaScript errors and debugging techniques", "Summary of JavaScript data structures and algorithm skills", "Summary of JavaScript traversal algorithms and techniques", and "Summary of JavaScript mathematical operations usage"
I hope this article will be helpful to everyone's JavaScript programming.