我有一个ReactJS HTML表组件,我使用 setState 方法更新其内容(单元格值)。以下是基本代码:
I have a ReactJS HTML table component and I update its content (cell values) with the setState method. Here is the basic code:
var Cell = React.createClass({ render: function () { return (<td>{this.props.cellValue}</td>); } }); var Row = React.createClass({ render: function () { return (<tr>{this.props.row}</tr>); } }); var Table = React.createClass({ getInitialState: function() { return { data: this.props.data }; }, render: function () { return ( <table> { this.state.data.map(function(row) { var r = row.map(function(cell) { return <Cell cellValue={cell}/>; }); return (<Row row={r}/>); }) } </table> ); }});您可以这样使用它:
var initialData = [[1,2,3],[4,5,6],[7,8,9]]; var table = React.renderComponent( <Table data={initialData} />, document.getElementById('table') );这大部分时间都在工作。我可以通过这样做来改变数据(在函数或其他任何地方):
This is working most of the time. I can change the data by doing this (somewhere in a function or whatever):
var newData = [[1,2,3],[4,5,6],[7,8,9],[10,11,12]]; table.setState({data : newData});如您所见,它在表的末尾添加了一行。但是,如果我尝试在此更新后设置初始数据,或以任何方式缩短行数,方法是将 data 设置为较小的数组(例如 [[1,2,3],[4,5,6]] 哪个应删除最后一行):
As you can see, it adds one row to the end of the table. However, if I try to set the initial data after this update or in any way shorten the number of rows by setting data to a smaller array (e. g. [[1, 2, 3], [4, 5, 6]] which should remove the last row):
table.setState({data : initialData});我收到此错误:
TypeError:updatedChildren [j]未定义 updatedChildren [j] .parentNode.removeChild(updatedChildren [j]);
TypeError: updatedChildren[j] is undefined updatedChildren[j].parentNode.removeChild(updatedChildren[j]);
它来自哪里?
推荐答案某些浏览器(使用Firefox和Chrome测试)会自动添加< tbody> ...< / tbody> 标记到没有它们的HTML表格。在我的表组件中添加它们可以解决问题:
Some browsers (tested with Firefox and Chrome) add automatically <tbody>...</tbody> tags to an HTML table that does not have them. Adding them in my Table component fix the issue:
render: function () { return ( <table><tbody> { ... same code as before ... } </tbody></table> );如果查看React生成的html代码,可以注意到它添加了一些数据属性( data-reactid )由React组件呈现的所有HTML标记(一般来说,有关数据属性的更多信息: go here )。由于< tbody> ...< / tbody> 标记不是来自React组件,因此它们没有任何 data-reactid 并且这些属性有助于React跟踪DOM节点。
If you look at the html code generated by React, you can notice it adds some data attributes (data-reactid) to all the HTML tags rendered by a React component (to more info about data attribute in general: go here). Since the <tbody>...</tbody> tags was not from a React component, they did not have any data-reactid and these attributes help React to track DOM nodes.
无论如何,感谢这些谈论这个问题的人。这里的链接 groups.google/forum/#!话题/ reactjs / NLS-PdrdDMA 。
Anyway, thank you to these people who talked about this issue. Here the link groups.google/forum/#!topic/reactjs/NLs-PdrdDMA.
更多关于 data-reactid : groups.google/forum/#!topic/reactjs/ewTN-WOP1w8 。
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从表中删除行会导致TypeError
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