JavaScript to implement mouse drag to change the size of the layer method

Last Update:2017-02-28 Source: Internet

Author: User

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This paper illustrates how JavaScript implements the mouse drag to change the size of the layer. Share to everyone for your reference. The implementation methods are as follows:

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<html> <head> <title> Drag to change the size of the layer </title> <meta content= "text/html; charset=gb2312 "http-equiv=" Content-type "> <style> {box-sizing:border-box; Moz-box-sizing:border-box} # testdiv {background-color:buttonface; background-repeat:repeat; background-attachment:scroll; color: #3969A5; height : 300px; left:30px; Overflow:hidden; width:500; Z-index:2; border:2px outset white; margin:0px; padding:2px; background-position:0% 50%} body {font-family:verdana; font-size:9pt} #innerNice {background-color:white; Backgrou Nd-repeat:repeat; Background-attachment:scroll; Color: #3969A5; height:100%; Overflow:auto; width:100%; border:2px inset White; padding:8px; background-position:0% 50%} </style> <script language=javascript> var theobject = null; function Resizeobject () {this.el = null;//pointer to the object this.dir = ""; Type of current resize (N,S,E,W,NE,NW,SE,SW) THIS.GRABX = null; Some useful values This.graby = nulL This.width = null; This.height = null; This.left = null; This.top = null; function Getdirection (EL) {var xpos, YPos, offset, dir; dir = ""; Xpos = Window.event.offsetX; YPos = Window.event.offsetY; offset = 8; The distance from the edge in pixels if (ypos<offset) dir = = "n"; else if (YPos > El.offsetheight-offset) dir = + "S"; if (xpos<offset) dir = = "W"; else if (xpos > El.offsetwidth-offset) dir = + "E"; return dir; function Dodown () {var el = getreal (event.srcelement, "ClassName", "resizeme"); if (el = = null) {theobject = null; RET Urn dir = Getdirection (EL); if (dir = = "") return; Theobject = new Resizeobject (); Theobject.el = El; Theobject.dir = dir; THEOBJECT.GRABX = Window.event.clientX; Theobject.graby = Window.event.clientY; Theobject.width = El.offsetwidth; Theobject.height = El.offsetheight; Theobject.left = El.offsetleft; Theobject.top = El.offsettop; Window.event.returnValue = false; Window.event.cancelBubble = true; The function Doup () {if (THEOBJEC)T!= null) {theobject = null;}} function Domove () {var el, xpos, YPos, str, xmin, ymin; xmin = 8;//the smallest width possible ymin = 8;//Height el = Getreal (event.srcelement, "ClassName", "Resizeme"); if (El.classname = = "Resizeme") {str = getdirection (EL);//fix the cursor if (str = "") str = "Default"; else str = "-resize"; El.style.cursor = str; }//dragging starts here if (theobject!= null) {if (Dir.indexof ("E")!=-1) theobject.el.style.width = Math.max (Xmin, the Object.width + WINDOW.EVENT.CLIENTX-THEOBJECT.GRABX) + "px"; if (Dir.indexof ("s")!=-1) theobject.el.style.height = Math.max (ymin, Theobject.height + window.event.clienty-theobjec T.graby) + "px"; if (Dir.indexof ("W")!=-1) {theobject.el.style.left = Math.min (Theobject.left + WINDOW.EVENT.CLIENTX-THEOBJECT.GRABX, Theobject.left + theobject.width-xmin) + "px"; Theobject.el.style.width = Math.max (xmin, Theobject.width-window.event.clientx + theobject.grabx) + "px"; } if (Dir.indexof ("n")!=-1) {TheoBject.el.style.top = math.min (Theobject.top + window.event.clienty-theobject.graby, Theobject.top + theobject.height- ymin) + "px"; Theobject.el.style.height = Math.max (ymin, Theobject.height-window.event.clienty + theobject.graby) + "px"; } Window.event.returnValue = false; Window.event.cancelBubble = true; } function Getreal (el, type, value) {temp = el; while (temp!= null) && (temp.tagname!= ' body ')) {if (eval () Temp. "+ type) = = value" {el = temp; return el;} temp = temp.parentelement; Return el; } Document.onmousedown = Dodown; Document.onmouseup = Doup; Document.onmousemove = Domove; </SCRIPT> </head> <body> <div class= "Resizeme" id= "Testdiv" > <div id= "Innernice" > <p align= "center" > </p> <p align= "center" > Please drag the mouse around the border </p> <p> </p> <p> </p> <p> </p> </div> </div> </body> </html>

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