Javascript jsx 表忽略的换行符

newlines character ignored by jsx table

提问by Eric Baldwin

I am trying to create a table with a multiline string, but the string is not formatted correctly by my table. Here is the jsx:

我正在尝试使用多行字符串创建一个表，但是我的表没有正确格式化该字符串。这是jsx：

<td>
  {arr.join('\n')}
</td>

And here is the corresponding html:

这是相应的html：

<td data-reactid=".xyz">Line 1
Line 2
Line 3
Line 4</td>

But in the browser it looks like:

但在浏览器中它看起来像：

What's going on and how do I get my newlines to appear?

发生了什么以及如何让我的换行符出现？

采纳答案by WiredPrairie

You've got a few options:

你有几个选择：

1) Use a block level element such as divor a pand wrap each line.

1) 使用块级元素，例如div或 ap并包裹每一行。

var TextLines = React.createClass({      
    render: function() {
        var lines = this.props.lines;

        var formatted = lines.map(function(line) {
            return (<p>{line}</p>);
        });
        return (<div>{ formatted }</div>);
    }
});

var lines = ['line 1', 'line 2', 'line 3'];
React.render(<TextLines lines={ lines }/>, 
              document.getElementById('container'));

2) Use a span with a brelement:

2）使用带有br元素的跨度：

var TextLines = React.createClass({      
    render: function() {
        var lines = this.props.lines;

        var br = lines.map(function(line) {
            return (<span>{line}<br/></span>);
        });
        return (<div>{ br }</div>);
    }
});

var lines = ['line 1', 'line 2', 'line 3'];
React.render(<TextLines lines={ lines } />,  
              document.getElementById('container'));

3) If you're certain there is no threat of XSS/hacks with the data, you could use dangerouslySetInnerHTMLwith a 'br' for each line:

3) 如果您确定数据没有 XSS/hacks 的威胁，您可以dangerouslySetInnerHTML为每一行使用一个 'br'：

var TextLines = React.createClass({      
    render: function() {
        var lines = this.props.lines;
        var content = {
            __html: lines.join('<br />')
        };     
        return (<div dangerouslySetInnerHTML={ content } />);
    }
});

var lines = ['line 1', 'line 2', 'line 3'];
React.render(<TextLines lines={ lines } />, 
             document.getElementById('container'));

The last one produces the least amount of HTML, but at a cost of potentially risky the security of the web page/user. I wouldn't use this one if the others work for you.

最后一个生成的 HTML 最少，但代价是可能危及网页/用户的安全。如果其他人为你工作，我不会使用这个。

回答by Chris

Try white-space: pre;or white-space: pre-wrap;(Thanks, @Mirage) in the style of your cell.

尝试white-space: pre;或white-space: pre-wrap;（谢谢，@Mirage）以您的单元格样式。

td {
  width: 150px;
}

.nopre {
  background-color: lightblue;
}

.withpre {
  background-color: lightgreen;
  white-space: pre;
}

.withprewrap {
  background-color: orange;
  white-space: pre-wrap;
}

<table><tr>

<td class="nopre">Line A
Line B
Line C
This is a cell with no whitespace setting</td>

</tr></table><table><tr>

<td class="withpre">Line 1
Line 2
Line 3
This is a cell with white-space: pre</td>

</tr></table><table><tr>
  
<td class="withprewrap">Line 1
Line 2
Line 3
This is a cell with white-space: pre-wrap</td>
  
</tr></table>

回答by dontmentionthebackup

When you really need this, use {'\n'}inside your JSX.

当你真的需要这个时，{'\n'}在你的 JSX 中使用。

回答by klioen

try to use the <pre>element or the css property white-space: pre-wrap;

尝试使用<pre>元素或 css 属性white-space: pre-wrap;

回答by flaviodesousa

This is an HTML thing where newlines are the same thing as spaces. To force newlines use <br/>tags like {arr.join('<br/>')}.

这是一个 HTML 的东西，其中换行符与空格相同。要强制换行，请使用<br/>诸如{arr.join('<br/>')}.