我如何在 ReactJS 中处理复杂的 objects？

Question

我有以下 ReactJS 代码：

var data1 = {"Columns":["Title1","Title2","Title3"],"Rows":[{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]},{"CellText":["Cell0","Cell1","Cell2"]}]};


var GridRow = React.createClass({
    render: function() {
        if(this.props.data){

        }
        return (
            <div>Text</div>
        );
    }
});


var GridList = React.createClass({
    render: function() {
        if(this.props.data){
            var Header = this.props.data.Columns.map(function (columns) {
                return (
                    <GridRow data={columns}>
                );
            });
            var Row = this.props.data.Rows.map(function (rows) {
                return (
                    <GridRow data={rows}>
                );
            });
        }
        return (
            <ul>
                <li>{Header}</li>
                <li>{Row}</li>
            </ul>
        );
    }
});


var GridBox = React.createClass({
    render: function(){
        return (
            <GridList data={data1} />
        );
    }
});

我正在尝试将 data1 变量传递给 GridList，它被拆分为 Columns（对于 header）和行。问题是我在运行时遇到以下异常：

In file "~/Scripts/Grid.jsx": Parse Error: Line 30: Unexpected token return (at line 30 column 6) Line: 52 Column:3

我是运行在 Visual Studio 2013 年使用 ReactJS 的。

规定的 Line nr 和 colum 没有意义

我正在尝试根据服务中的元数据（列）和行数据呈现 table。

Answer 1

您需要使用匹配的关闭标签或自关闭标签来关闭标签。

// ERROR
<GridRow data={rows}>

// OK
<GridRow data={rows}></GridRow>

// Best
<GridRow data={rows} />

^{错误消息不是很有帮助。}

此外，在创建节点数组时，最好为它们提供键。

Rows.map(function(row, i){
    return <GridRow data={rows} key={i} />;
});

我又玩了一会儿，奇怪的是 JSX 接受起始标记和 <、{ 或 } 之间的任何内容作为原始文本。如果你做了这样的事情：

var GridList = React.createClass({
    render: function() {
        if(this.props.data){
            var Header = this.props.data.Columns.map(function (columns) {
                return (
                    <GridRow data={columns}>
                );
            });
            var Row = this.props.data.Rows.map(function (rows) </GridRow>
            )});
        }
        return (
            <ul>
                <li>{Header}</li>
                <li>{Row}</li>
            </ul>
        );
    }
});

它会愉快地输出这个：

var GridList = React.createClass({displayName: "GridList",
    render: function() {
        if(this.props.data){
            var Header = this.props.data.Columns.map(function (columns) {
                return (
                    React.createElement(GridRow, {data: columns}, 
                ");" + ' ' +
            "});" + ' ' +
            "var Row = this.props.data.Rows.map(function (rows) ")
            )});
        }
        return (
            React.createElement("ul", null, 
                React.createElement("li", null, Header), 
                React.createElement("li", null, Row)
            )
        );
    }
});

直到遇到Rows.map(function (rows)后的{，表示"go back into JavaScript expression mode"，才完全满足，又遇到表达式中的return，无效，所以它保释，并给出它能给出的最佳错误。

我如何在 ReactJS 中处理复杂的 objects？

How do I handle complex objects in ReactJS?

javascript

web

reactjs

reactjs.net