Javascript achieves perfect drag and drop effect_javascript skills
The principle of drag and drop
1. Get the distance (mouse position - odiv margin)
2. Understand when to use onmousemove event
3. Determine whether it has crossed the boundary
html code:
<div id="div1"></div>
css code:
#div1{width:100px;height:100px;background:red;position:absolute}
javascript code:
window.onload=function(){
var oDiv=document.getElementById("div1");
var x=0;
var y=0;
oDiv.onmousedown=function(ev){
var oEvent=ev||event;
//鼠标的横坐标减去div的offsetLeft
x=oEvent.clientX-oDiv.offsetLeft;
//鼠标的纵坐标减去div的offsetTop
y=oEvent.clientY-oDiv.offsetTop;
document.onmousemove=function(ev){
var oEvent=ev||event;
var left=oEvent.clientX-x;
var right=oEvent.clientY-y;
//判断左边是否过界
if(left<0){
left=0;
}
//判断右边是否过界
else if(left>document.documentElement.clientWidth-oDiv.offsetWidth){
left=document.documentElement.clientWidth-oDiv.offsetWidth;
}
//判断上边是否过界
if(right<0){
right=0;
}
//判断下边是否过界
else if(right>document.documentElenment.clientHeight){
right=document.documentElenment.clientHeight-oDiv.offsetHeight;
}
oDiv.style.left=left+"px";
oDiv.style.top=right+"px";
}
document.onmouseup=function(){
//清空document的事件
document.onmousemove=null;
document.onmouseup=null;
}
//解决低版本火狐bug，干掉系统默认
return false;
}
}
The above is the entire content of this article, I hope you all like it.
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