未捕获错误：不变违规：findComponentRoot（...，... $ 110）：无法找到元素。这可能意味着DOM意外地发生了变异 [英] Uncaught Error: Invariant Violation: findComponentRoot(..., ...$110): Unable to find element. This probably means the DOM was unexpectedly mutated

问题描述

我在React的嵌套循环中做错了什么？我在谷歌搜索过信息，但没有找到合适的信息。你能帮我找到，我理解错了吗？

What I'm doing wrong with nested cycles in React? I have searched information in Google and I didn't find anything suitable. Can you help me find, what I understand wrong?

从图中可以看出，我在变量中有数据。它工作正常。但是，当我添加的值不是来自此< tr> 时，会出现错误！

As can be seen from the figure, I have data in a variable. And it works fine. But when I'm adding a value not from this <tr>, error appears!

    var TableBalls80 = React.createClass({
        render:function(){
            var rows = this.props.rows;
            var columnId = 0, trKey = 0, divKey = 0, td1stKey = 0;
            var td2ndKey = 100;
            return(
                    <table className='table table-bordered bg-success'>
                                <thead>
                                <tr className='danger'>
                                    {rows[0].row.map(function (element){
                                        columnId++;
                                        return (
                                        <th colSpan="2" key={columnId}>{columnId}</th>);
                                    })}
                                </tr>
                                </thead>
                                <tbody>
                                    {rows.map(function (rowElement){
                                        return (<tr key={trKey++}>
                                        {rowElement.row.map(function(ball){
                                            console.log('trKey:'+trKey+' td1stKey'+td1stKey+' ball.value:'+ball.value+' td2ndKey:'+td2ndKey+' ball.count:'+ball.count);
                                            return(<div key={divKey++}>
                                                <td className='info' key={td1stKey++}>{ball.value}</td><td key={td2ndKey++}>{ball.count}</td>
                                            </div>);
                                        })}
                                        </tr>);
                                    })}
                                </tbody>
                            </table>);
        }
    });

错误（取决于从另一个< tr> <中添加的项目/ code>）：

Error (depends on which item is added from another<tr>):

未捕获错误：不变违规：findComponentRoot（...，.0.1.1.0.2.0.0.1 。$ 0. $ 9. $ 109）：>无法找到元素。这可能意味着DOM意外地发生了变异（例如，通过>浏览器），通常是由于在使用表时忘记了一个，n ......`。

Uncaught Error: Invariant Violation: findComponentRoot(..., .0.1.1.0.2.0.0.1.$0.$9.$109): >Unable to find element. This probably means the DOM was unexpectedly mutated (e.g., by the >browser), usually due to forgetting a when using tables, n......`.

推荐答案

所以问题是你正在创建一个像这样的虚拟DOM结构：

So the problem is you're creating a virtual DOM structure like this:

<tbody>
   <tr>
      <div>
         <td>...</td>
         <td>...</td>
      </div>
   </tr>
</tbody>

因为< div /> isn这是的有效孩子< tr> 浏览器实际上创建了代表以下内容的DOM：

Because <div/> isn't a valid child of <tr> the browser actually creates DOM representing this:

<div> </div>
<table>
<tbody>
   <tr>
      <td>...</td>
      <td>...</td>
   </tr>
</tbody>
</table>

^小提琴

当反应进行更新时，它正在查看< tr> 并想知道< div> 去了哪里。相反，它会找到< td> ，因此会抛出错误。

When react goes to update, it's looking at that <tr> and wondering where the <div> went. Instead it finds a <td> so it throws an error.

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