React.js在渲染中调用递归函数
尝试使用React.js显示树状视图
Trying to display a hierarquical tree view with React.js
我的渲染方法:
render: function(){
var self= this;
return(
<div className="panel panel-flat content-group-lg">
<div className='panel-body'>
<div className="tree">
<ul>
<li>
<a href="#">Categorias</a>
{ self.printTree(this.state.tree_array) }
</li>
</ul>
</div>
</div>
</div>
)
}
和我的printTree方法:
printTree: function(level){
console.log(level);
var self = this;
var level_length = level.length;
if(level_length >= 1){
return(
<ul>{
level.map(function(category){
return (
<li key={category.fields.name}>
<a href='#'>{category.fields.name}</a>
</li>
{self.printTree(category.sons_array)}
)
})
}</ul>
)
}
}
printTree方法接收一个与树的级别"相对应的数组.我的目标是打印"此级别的每个元素(因此我使用映射来迭代数组),但也打印当前元素的任何可能的子级别,因此我尝试递归地调用该函数,并传递当前元素作为递归调用的新数组参数.
The printTree method receives an array that corresponds to a "level" of the tree. My goal is to 'print' each element of this level ( so I use the map to iterate over the array ) but also print any possible sublevels of the current element, so I tried to call the function recursively, passing the 'sons' of the current element as the new array parameter for the recursive call.
由于某种原因,请致电:
For some reason, calling:
{self.printTree(category.sons_array)}
{self.printTree(category.sons_array)}
给我:未捕获的语法错误: http://127.0.0.1/gims -webapp/components/NavBar.js :意外令牌(901:84)
gives me: Uncaught SyntaxError: http://127.0.0.1/gims-webapp/components/NavBar.js: Unexpected token (901:84)
我正在使用JSX,无法弄清JSX在抱怨什么.
I'm using JSX and can't figure out what JSX is complaining about..
我的最终结构应如下所示:
My final structure should look like this:
<div class="tree">
<ul>
<li>
<a href="#">Parent</a>
<ul>
<li>
<a href="#">Child</a>
<ul>
<li>
<a href="#">Grand Child</a>
</li>
</ul>
</li>
<li>
<a href="#">Child</a>
<ul>
<li><a href="#">Grand Child</a></li>
<li>
<a href="#">Grand Child</a>
<ul>
<li>
<a href="#">Great Grand Child</a>
</li>
<li>
<a href="#">Great Grand Child</a>
</li>
<li>
<a href="#">Great Grand Child</a>
</li>
</ul>
</li>
<li><a href="#">Grand Child</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
JSX要求仅一个根节点,因此此代码:
JSX requires expects only one Root Node, so this code:
return (
<li key={category.fields.name}>
<a href='#'>{category.fields.name}</a>
</li>
{self.printTree(category.sons_array)}
)
应更改为:
return (
<li key={category.fields.name}>
<a href='#'>{category.fields.name}</a>
{self.printTree(category.sons_array)}
</li>
)
或者就像返回:
<li>
...
</li>
<ul>
...
</ul>
有几个根节点.