オリジナルのJavaScriptのドラッグ方法を共有します.
3127 ワード
コード:
function drag(t,p){
var point = p || null,
target = t || null,
resultX = 0,
resultY = 0;
(!point)? point = target : ''; // ,
function getPos(t){
var offsetLeft = 0,
offsetTop = 0,
offsetParent = t;
while(offsetParent){
offsetLeft+=offsetParent.offsetLeft;
offsetTop+=offsetParent.offsetTop;
offsetParent = offsetParent.offsetParent;
}
return {'top':offsetTop,'left':offsetLeft};
}
function core(){
var width = document.body.clientWidth || document.documentElement.clientWidth,
height = document.body.clientHeight || document.documentElement.clientHeight;
maxWidth = width - target.offsetWidth,
maxHeight = height - target.offsetHeight;
(resultX >= maxWidth)? target.style.left = maxWidth+'px' : (resultX > 0)?target.style.left = resultX +'px': ''; // 。
(resultY >= maxHeight)? target.style.top = maxHeight +'px' : (resultY > 0)?target.style.top = resultY +'px':''; // 。
point.onmousedown=function(e){
var e = e || window.event,
coordX = e.clientX,
coordY = e.clientY,
posX = getPos(target).left,
posY = getPos(target).top;
point.setCapture && point.setCapture(); // Mouse 。
document.onmousemove=function(e){
var ev = e || window.event,
moveX = ev.clientX,
moveY = ev.clientY;
resultX = moveX - (coordX - posX); //
resultY = moveY - (coordY - posY);
(resultX > 0 )?((resultX < maxWidth)?target.style.left = resultX+'px' : target.style.left = maxWidth+'px') : target.style.left = '0px';
(resultY > 0 )?((resultY < maxHeight)?target.style.top = resultY+'px' : target.style.top = maxHeight+'px') : target.style.top = '0px';
ev.stopPropagation && ev.stopPropagation();
ev.preventDefault;
ev.returnValue = false;
ev.cancelBubble = true;
};
};
document.onmouseup=function(){ // , DOM , onmousedown BUG。
document.onmousemove = null;
point.releaseCapture && point.releaseCapture(); // Mouse 。
};
point.onmouseup=function(e){
var e = e || window.event;
document.onmousemove = null;
point.releaseCapture && point.releaseCapture();
};
}
core();
window.onresize = core;
}
使い方:
drag(t,p)
/*
*
* t
* p
*/
// : ,