所以我几乎可以肯定在做错事,而不理解这里的基础库,但是我如何制作它,以便我可以在外部更新一项行件,以使react-data-grid?
下面的示例,在5s之后,第一行的第一行更新了,但表中的数据不是。为什么?以及如何更改?
let cols = [
{
key: 'sapAssetNumber',
name: 'SAP Asset number',
editable: false
},
{
key: 'assetDescription',
name: 'Description',
editable: false
},
{
key: 'assetNBV',
name: 'Asset NBV',
editable: false
},
{
key: 'salePrice',
name: 'Sale price',
editable: false
}
];
let rows = [
{
"id" : "0",
"sapAssetNumber" : "woof",
"isAlreadyDisposed" : "",
"assetDescription" : "test",
"assetNBV" : "100",
"salePrice" : "100"
},
{
"id" : "0",
"sapAssetNumber" : "",
"isAlreadyDisposed" : "",
"assetDescription" : "test",
"assetNBV" : "100",
"salePrice" : "100"
},
{
"id" : "this",
"sapAssetNumber" : "is",
"isAlreadyDisposed" : "a",
"assetDescription" : "test",
"assetNBV" : "",
"salePrice" : ""
},
{
"id" : "jfkhkdafhn",
"sapAssetNumber" : "",
"isAlreadyDisposed" : "",
"assetDescription" : "",
"assetNBV" : "",
"salePrice" : ""
},
{
"id" : "kjdsaflkadjsf",
"sapAssetNumber" : "",
"isAlreadyDisposed" : "",
"assetDescription" : "",
"assetNBV" : "",
"salePrice" : ""
},
{
"id" : "",
"sapAssetNumber" : "",
"isAlreadyDisposed" : "",
"assetDescription" : "",
"assetNBV" : "500",
"salePrice" : "500"
}
];
class Example extends React.Component {
constructor() {
super();
setTimeout(() => {
console.log('changed');
rows[0].sapAssetNumber = 'meow'
}, 5000);
}
render() {
return <ReactDataGrid
columns={cols}
rowGetter={(i) => rows[i]}
rowsCount={10}
/>;
}
}
ReactDOM.render(<Example />, document.querySelector("#app"))
body {
background: #20262E;
padding: 20px;
font-family: Helvetica;
}
#app {
background: #fff;
border-radius: 4px;
padding: 20px;
transition: all 0.2s;
}
li {
margin: 8px 0;
}
h2 {
font-weight: bold;
margin-bottom: 15px;
}
.done {
color: rgba(0, 0, 0, 0.3);
text-decoration: line-through;
}
input {
margin-right: 5px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.6.3/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.6.3/umd/react-dom.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-data-grid/6.1.0/react-data-grid.min.js"></script>
<div id="app"></div>
行变量是文件中的全局变量。5秒钟后,行变量发生了变化,但是,由于行变量既不通过示例组件状态维护,也不是对示例组件的支架,因此示例组件生命周期方法不会跟踪更改。因此,当行变量更改时,未调用示例组件的渲染方法,因此ReactDatagrid未获得更新的值。
尝试在示例组件的状态下维护行变量。像这样 -
let cols = [
{
key: 'sapAssetNumber',
name: 'SAP Asset number',
editable: false
},
{
key: 'assetDescription',
name: 'Description',
editable: false
},
{
key: 'assetNBV',
name: 'Asset NBV',
editable: false
},
{
key: 'salePrice',
name: 'Sale price',
editable: false
}
];
let rows = [
{
"id" : "0",
"sapAssetNumber" : "woof",
"isAlreadyDisposed" : "",
"assetDescription" : "test",
"assetNBV" : "100",
"salePrice" : "100"
},
{
"id" : "0",
"sapAssetNumber" : "",
"isAlreadyDisposed" : "",
"assetDescription" : "test",
"assetNBV" : "100",
"salePrice" : "100"
},
{
"id" : "this",
"sapAssetNumber" : "is",
"isAlreadyDisposed" : "a",
"assetDescription" : "test",
"assetNBV" : "",
"salePrice" : ""
},
{
"id" : "jfkhkdafhn",
"sapAssetNumber" : "",
"isAlreadyDisposed" : "",
"assetDescription" : "",
"assetNBV" : "",
"salePrice" : ""
},
{
"id" : "kjdsaflkadjsf",
"sapAssetNumber" : "",
"isAlreadyDisposed" : "",
"assetDescription" : "",
"assetNBV" : "",
"salePrice" : ""
},
{
"id" : "",
"sapAssetNumber" : "",
"isAlreadyDisposed" : "",
"assetDescription" : "",
"assetNBV" : "500",
"salePrice" : "500"
}
];
class Example extends React.Component {
constructor() {
super();
this.state={rows:rows}
}
componentDidMount = () =>{
const context = this;
setTimeout(() => {
rows[0].sapAssetNumber = 'meow'
context.setState({rows});
}, 5000);
}
render() {
return <ReactDataGrid
columns={cols}
rowGetter={(i) => rows[i]}
rowsCount={10}
/>;
}
}
ReactDOM.render(<Example />, document.querySelector("#app"));
请在组件状态上阅读此信息:-https://reactjs.org/docs/faq-state.html
请阅读以查看渲染方法何时称为:-https://lucybain.com/blog/2017/react-js-when-when-to-rerender/
希望它解决问题!
通过GitHub咨询react-data-grid
中的问题后,我使用了提供的解决方案。
然后只需要致电this.refresh()
即可。它不是很漂亮,但似乎是RDG
getRowCount() {
let count = this.props.rows.length;
if(this.state.refresh && count > 0) {
count--; // hack for update data-grid
this.setState({
refresh: false
});
}
return count;
}
refresh() {
this.setState({
refresh: true
});
}