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The example of this article for you to share the production of JavaScript simple Sketchpad method for your reference, the specific content as follows
Html:
<body id= "Bodys" > <span id= "Eraser" > Clear All </span> <span id= "COLORBTN" > stroke Color </span> <input type= "range" name= "Ram" id= "Ram" min= "1" max= "M" step= "1" value= "ten"/> <label id= "ramnum" > Font size:10px</label> <ul id= "Colorpanel" > <li> Black </li > <li> red </li> <li> green </li> <li> Blue </li> </ul> </body>
Css:
*{
margin:0;
padding:0
}
. box_black{
Background-color:black;
Position:absolute
}
. box_red{
background-color:red;
Position:absolute
}
. box_green{
Background-color:green;
Position:absolute
}
. box_blue{
Background-color:blue;
Position:absolute;
}
#eraser {
width:80px;
height:50px;
Background-color:brown;
Display:inline-block;
Text-align:center;
line-height:50px;
Cursor:pointer;
}
#colorbtn {
width:80px;
height:50px;
Background-color:tomato;
Display:inline-block;
Text-align:center;
line-height:50px;
Cursor:pointer;
}
#colorpanel {
width:80px;
height:200px;
List-style:none;
margin-left:88px;
Display:none;
}
#colorpanel >li{
width:80px;
height:50px;
Text-align:center;
line-height:50px;
Background-color:aquamarine;
Display:inline-block;
Cursor:pointer;
}
#colorpanel >li:hover{
background-color:orange;
}
Javascript:
Window.onload=function () {///Save class name as an array var classname=["Box_black", "box_red", "Box_green", "Box_blue"];
The default class name is Box_black var clsname=classname[0];
var Obody=document.getelementbyid ("Bodys");
var odiv=obody.getelementsbytagname ("div");
var Eraser=document.getelementbyid ("Eraser");
var Colorbtn=document.getelementbyid ("Colorbtn");
var Colorpanel=document.getelementbyid ("Colorpanel");
var Ram=document.getelementbyid ("Ram");
var Ramnum=document.getelementbyid ("Ramnum");
Colorbtn.onmouseover=function () {colorpanel.style.display= "block";
} colorbtn.onmouseout=function () {colorpanel.style.display= ' none ';
} colorpanel.onmouseover=function () {this.style.display= "block";
} colorpanel.onmouseout=function () {this.style.display= ' none ';
for (Var i=0;i<colorpanel.children.length;i++) {colorpanel.children[i].index=i;
Colorpanel.children[i].onclick=function () {//mouse click Li Switch class name to change the style clsname=classname[this.index]; Colorpanel.stYle.display= "None";
}//define default font size of 10px var width= "10px";
var height= "10px";
Change font size by sliding range ram.onmousemove=function () {width=height=ram.value+ "px";
Ramnum.innerhtml= "Font size:" +width; //mouse click on the screen, through the sliding mouse constantly create div attribute node, and give it a style document.onmousedown=function () {document.onmousemove=function (event) {var oe vent=event| |
window.event; var scrolltop=document.documentelement.scrolltop| |
Document.body.scrollTop; var scrollleft=document.documentelement.scrollleft| |
Document.body.scrollLeft;
var box=document.createelement ("div");
Box.classname=clsname;
Box.style.width=width;
Box.style.height=height;
Obody.appendchild (box);
box.style.left=scrollleft+oevent.clientx+ "px";
box.style.top=scrolltop+oevent.clienty+ "px"; }//When the mouse button is released, log off the mouse sliding event document.onmouseup=function () {document.onmousemove=null;}//When the rubber difference button is clicked, Iterate through all the div and remove them all from the parent node eraser.onclick=function () {var odiv=obody.getelementsbytagname ("div"); for (Var i=0;i< odiv.length;i++){Obody.removechild (odiv[i]);} //The following is the Cancel button bubbling event because we clicked the button is not able to draw Div eraser.onmousedown=function (event) {var ievent=event| |
window.event;
Ievent.cancelbubble=true; } colorbtn.onmousedown=function (Event) {var ievent=event| |
window.event;
Ievent.cancelbubble=true; } colorpanel.onmousedown=function (Event) {var ievent=event| |
window.event;
Ievent.cancelbubble=true; } ram.onmousedown=function (Event) {var ievent=event| |
window.event;
Ievent.cancelbubble=true;
}
}
}
This is based on the JavaScript event based on the basics, relatively simple, in fact, can be further optimized. Look at the effect chart below.
The above is the entire content of this article, I hope to help you learn, but also hope that we support the cloud habitat community.
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