Javascript 实施拖放;使用react删除多个列表
我正在尝试使用react实现多个列表的拖放,但我似乎无法让它工作 放置后,我的颜色对象会发生变化,但它不会将项目放置在准确的位置。此外,在拖动时,占位符也会在ul valid dropzone之外可见Javascript 实施拖放;使用react删除多个列表,javascript,reactjs,drag-and-drop,Javascript,Reactjs,Drag And Drop,我正在尝试使用react实现多个列表的拖放,但我似乎无法让它工作 放置后,我的颜色对象会发生变化,但它不会将项目放置在准确的位置。此外,在拖动时,占位符也会在ul valid dropzone之外可见 var colors = { "a": ["Red", "Green", "Blue"], "b": ["Yellow", "Black",
var colors = {
"a": ["Red", "Green", "Blue"],
"b": ["Yellow", "Black", "White", "Orange"]
};
var placeholder = document.createElement("li");
placeholder.className = "placeholder";
var List = React.createClass({
getInitialState: function() {
return {
data: this.props.data
};
},
dragStart: function(key, index, e) {
this.dragged = e.currentTarget;
this.contentToBeDragged_src = e.currentTarget.parentNode;
e.dataTransfer.effectAllowed = 'move';
// Firefox requires dataTransfer data to be set
e.dataTransfer.setData("text/html", e.currentTarget);
},
dragEnd: function(key, index, e) {
console.log(key + ' ' + index);
this.dragged.style.display = "block";
//this.dragged.parentNode.removeChild(placeholder);
// Update data
var data = this.state.data;
var from = Number(this.dragged.dataset.id);
var to = Number(this.over.dataset.id);
data[index].splice(0, data[index].splice(from, 1)[0]);
this.setState({
data: data
});
},
dragOver: function(e) {
e.preventDefault();
//this.dragged.style.display = "none";
if (e.target.className == "placeholder") return;
this.over = e.target;
// Inside the dragOver method
var relY = e.clientY - this.over.offsetTop;
var height = this.over.offsetHeight / 2;
var parent = e.target.parentNode;
if (relY > height) {
this.nodePlacement = "after";
parent.insertBefore(placeholder, e.target.nextElementSibling);
} else if (relY < height) {
this.nodePlacement = "before"
parent.insertBefore(placeholder, e.target);
}
},
render: function() {
var context = this;
var lists = Object.keys(context.state.data).map(function(key) {
return <ul onDragOver = {
context.dragOver
} > {
context.state.data[key].map(function(item, i) {
return ( <
li data - id = {
i
}
key = {
i
}
draggable = "true"
onDragEnd = {
(evt) => context.dragEnd(key, i, evt)
}
onDragStart = {
(evt) => context.dragStart(key, i, evt)
} >
{
item
} <
/li>
)
}, context)
} <
/ul>
});
return <div > {
lists
} < /div>
}
});
ReactDOM.render( <
List data = {
colors
}
/>, document.getElementById('app')
);
var颜色={
“a”:[“红”、“绿”、“蓝”],
“b”:[“黄色”、“黑色”、“白色”、“橙色”]
};
var占位符=document.createElement(“li”);
placeholder.className=“placeholder”;
var List=React.createClass({
getInitialState:函数(){
返回{
数据:this.props.data
};
},
dragStart:函数(键、索引、e){
this.drad=e.currentTarget;
this.contentToBeDragged_src=e.currentTarget.parentNode;
e、 dataTransfer.effectAllowed='move';
//Firefox需要设置数据传输数据
e、 setData(“text/html”,例如currentTarget);
},
dragEnd:函数(键、索引、e){
控制台日志(键+“”+索引);
this.dradded.style.display=“block”;
//this.dragged.parentNode.removeChild(占位符);
//更新数据
var data=this.state.data;
var from=Number(this.draugd.dataset.id);
var to=Number(this.over.dataset.id);
数据[index]。拼接(0,数据[index]。拼接(from,1)[0]);
这是我的国家({
数据:数据
});
},
德拉戈弗:功能(e){
e、 预防默认值();
//this.dradded.style.display=“无”;
if(e.target.className==“占位符”)返回;
这个。超过=e。目标;
//在dragOver方法内部
var Relay=e.clientY—this.over.offsetTop;
var height=this.over.offsetHeight/2;
var parent=e.target.parentNode;
如果(依赖>高度){
this.nodePlacement=“after”;
parent.insertBefore(占位符,例如target.nextElementSibling);
}否则如果(依赖<高度){
this.nodePlacement=“before”
parent.insertBefore(占位符,例如target);
}
},
render:function(){
var context=this;
var list=Object.keys(context.state.data).map(function(key){
返回 {
context.state.data[key].map(函数(项,i){
报税表(<
li数据-id={
我
}
键={
我
}
draggable=“true”
onDragEnd={
(evt)=>context.dragEnd(key,i,evt)
}
onDragStart={
(evt)=>context.dragStart(键,i,evt)
} >
{
项目
} <
/李>
)
},上下文)
} <
/ul>
});
返回{
列表
}