我正在尝试将DnD反应的基本示例应用到我的项目中(作为概念证明)并遇到了一些问题。我正在使用这个例子 - https://github.com/gaearon/react-dnd/tree/master/examples/02%20Drag%20Around/Naive。只是让你在一个盒子里面拖动一些div。
所以我有一个外部组件(注意:这是实际拖动组件的几个组件级别),这基本上是整个页面(这只是为了首先测试POC),看起来像这样:
import { DropTarget, DragDropContext } from 'react-dnd';
import HTML5Backend from 'react-dnd-html5-backend';
const boxTarget = {
drop(props, monitor, component) {
const item = monitor.getItem();
const delta = monitor.getDifferenceFromInitialOffset();
const left = Math.round(item.left + delta.x);
const top = Math.round(item.top + delta.y);
component.moveBox(item.id, left, top);
}
};
// eslint-disable-next-line new-cap
@DragDropContext(HTML5Backend)
// eslint-disable-next-line new-cap
@DropTarget('CLA_DRAG', boxTarget, (connect) => ({
connectDropTarget: connect.dropTarget()
}))
export default class GenericPlatformComponent extends React.Component {
...
render() {
const { connectDropTarget } = this.props;
return connectDropTarget(
<div>
{this.getBuilders()}
</div>
);
}
}
非常靠近examples容器,现在只使用字符串而不是@ DropTarget
中的常量。 getBuilders只是渲染其他组件。 我在创建DragSource组件之前运行此组件,一切运行正常。
所以,有几个组件我只是将反应DnD语法添加到我想要可拖动的组件中:
import { DragSource } from 'react-dnd';
const boxSource = {
beginDrag(props) {
const { id, left, top } = props;
return { id, left, top };
}
};
// eslint-disable-next-line new-cap
@DragSource('CLA_DRAG', boxSource, (connect, monitor) => ({
connectDragSource: connect.dragSource(),
isDragging: monitor.isDragging()
}))
export default class SearchResult extends React.Component {
constructor(props) {
super(props);
}
render() {
const { connectDragSource } = this.props;
return connectDragSource(
<div key={this.props.key}>
<Row>
<Col xs={2} sm={2} md={1} lg={1} >
<div style={tempThumbnail}>
Picture Here
</div>
</Col>
<Col xs={10} sm={10} md={11} lg={11} >
<DescriptionBlock result={this.props.result} {...this.props} />
</Col>
</Row>
</div>
);
}
}
所有这些,我在控制台上收到此错误(应用程序也停止渲染)。
bundle.js:29605 Uncaught (in promise) Error: removeComponentAsRefFrom(...): Only a ReactOwner can have refs. You might be removing a ref to a component that was not created inside a component's `render` method, or you have multiple copies of React loaded (details: react-refs-must-have-owner).(…)
奇怪的是dragsource还没有调到dom上,所以我不知道从哪里开始这个错误。任何意见或建议将不胜感激。谢谢!
答案 0 :(得分:0)
也许您省略了它,但您应该在两个示例中导入React:
import React from 'react'