我们经常会遇见拖拽某一个元素的场景,拖拽也是很常用的;
这次拖拽遇见一个问题,有时在拖拽的时候吗,鼠标松开,元素仍然可以拖拽;
经过查阅资料,发现:
会触发H5原生的拖拽事件。并且不会监听到onmouseup,
从而导致鼠标松开也能够拖拽。
解决办法就是直接干掉H5的拖拽事件
document.ondragstart = function(ev) {
ev.preventDefault();
};
document.ondragend = function(ev) {
ev.preventDefault();
};
onmouseup不能够触发的原因:https://blog.csdn.net/z467469274/article/details/77332830?utm_source=blogxgwz2
拖拽讲解 https://blog.csdn.net/weixin_41910848/article/details/82218243
<div class="box" id="drag"></div>
<script type="text/javascript">
window.onload = function(){
var drag = document.getElementById('drag');
// //点击某物体时,用drag对象即可,move和up是全局区域,
// 也就是整个文档通用,应该使用document对象而不是drag对象(否则,采用drag对象时物体只能往右方或下方移动)
// 按下
drag.onmousedown = function(event){
console.log("drag按下的时候触发 " , )
var event = event || window.event; //兼容IE浏览器
// 鼠标点击物体那一刻相对于物体左侧边框的距离=点击时的位置相对于浏览器最左边的距离-物体左边框相对于浏览器最左边的距离
var diffX = event.clientX - drag.offsetLeft;
var diffY = event.clientY - drag.offsetTop;
if(typeof drag.setCapture !== 'undefined'){
drag.setCapture();
}
// 移动
document.onmousemove = function(event){
var event = event || window.event;
var moveX = event.clientX - diffX;
var moveY = event.clientY - diffY;
if(moveX < 0){
moveX = 0
}else if(moveX > window.innerWidth - drag.offsetWidth){
moveX = window.innerWidth - drag.offsetWidth
}
if(moveY < 0){
moveY = 0
}else if(moveY > window.innerHeight - drag.offsetHeight){
moveY = window.innerHeight - drag.offsetHeight
}
drag.style.left = moveX + 'px';
drag.style.top = moveY + 'px'
}
// 抬起停止移动
document.onmouseup = function(event){
console.log( "抬起停止移动" )
this.onmouseup = null;
this.onmousemove = null;
//修复低版本ie bug
if(typeof drag.releaseCapture!='undefined'){
drag.releaseCapture();
}
}
// 解决有些时候,在鼠标松开的时候,元素仍然可以拖动;
document.ondragstart = function(ev) {
ev.preventDefault();
console.log(1212)
};
document.ondragend = function(ev) {
ev.preventDefault();
console.log("asd")
};
}
}
</script>
如果你是vue的话,封装改方法
Vue.prototype.dragandDrop=function(ele){
var drag = document.getElementById(ele);
// //点击某物体时,用drag对象即可,move和up是全局区域,
// 也就是整个文档通用,应该使用document对象而不是drag对象(否则,采用drag对象时物体只能往右方或下方移动)
drag.onmousedown = function(event){
var event = event || window.event; //兼容IE浏览器
//鼠标点击物体那一刻相对于物体左侧边框的距离=点击时的位置相对于浏览器最左边的距离-物体左边框相对于浏览器最左边的距离
var diffX = event.clientX - drag.offsetLeft;
var diffY = event.clientY - drag.offsetTop;
if(typeof drag.setCapture !== 'undefined'){
drag.setCapture();
}
if(event.stopPropagation) event.stopPropagation();
if(event.preventDefault) event.preventDefault();
document.onmousemove = function(event){
var event = event || window.event;
var moveX = event.clientX - diffX;
var moveY = event.clientY - diffY;
if(moveX < 0){
moveX = 0
}else if(moveX > window.innerWidth - drag.offsetWidth){
moveX = window.innerWidth - drag.offsetWidth
}
if(moveY < 0){
moveY = 0
}else if(moveY > window.innerHeight - drag.offsetHeight){
moveY = window.innerHeight - drag.offsetHeight
}
drag.style.left = moveX + 'px';
drag.style.top = moveY + 'px'
}
}
}
// 抬起方法(拖拽停止)
Vue.prototype.stop=function(ele){
console.log(11);
document.onmouseup = function(event){
var event = event || window.event; //兼容IE浏览器
if(event.stopPropagation) event.stopPropagation();//这个可以删除
if(event.preventDefault) event.preventDefault();//这个可以删除
console.log( " this.onmousemove", this.onmousemove);
this.onmousemove = null;
this.onmouseup = null;
}
}
使用
<rich-text class="rich-text-com" id="richdragIndex" @aaa="down" @bbb="upuo"></rich-text>
<script>
// 解决有些时候,在鼠标松开的时候,元素仍然可以拖动;
document.ondragstart = function(ev) {
ev.preventDefault();
};
document.ondragend = function(ev) {
ev.preventDefault();
};
export default {
data(){
return{
}
},
methods:{
down(){
console.log("ppp");
this.dragandDrop("richdragIndex");
},
upuo(){
console.log("触发抬起");
this.stop("richdragIndex")
}
}
}