【发布时间】:2016-08-14 22:28:05
【问题描述】:
我有一个递归 ng-repeat 用于创建一个可能有无限子节点的分支思维导图树(运行下面的代码 sn-p 以更好地理解我的意思)。
我的$scope 中有一个remove() 函数,它打算自行删除。但是,要做到这一点,我需要访问父级。我尝试通过使用 ng-init 在名为 parent 的变量中设置父节点来实现这一点。问题是,parent 变量似乎是指节点本身而不是其父节点。如何将父级注入循环?
除了前面提到的$scope.remove()之外的所有东西都在下面的sn-p中工作:
(function(){
angular
.module('createTree',[])
.controller('CreateTreeController', function($scope){
$scope.tree=[{
title:'node 1',
subNodes:[
{
title:'node 1.1',
subNodes:[]
},
{
title:'node 1.2',
subNodes:[
{
title:'node 1.2.1',
subNodes:[]
},
{
title:'node 1.2.2',
subNodes:[]
}
]
},
{
title:'node 1.3',
subNodes:[]
}
]
}];
$scope.addTo=function(node){
node.subNodes.push({
title: node.title+"."+(node.subNodes.length+1),
subNodes:[]
});
}
$scope.remove=function(node,parent){
var index=parent.subNodes.indexOf(node)
if(index>-1) parent.subNodes.splice(index,1);
}
});
})();
*{
position: relative;
box-sizing: border-box;
}
.node{
padding: 1px 0;
}
.node>.subNodes{
margin-left: 10px;
}
.node>.subNodes::before{
content: '';
display: block;
width: 5px;
height: 1px;
background-color: black;
position: absolute;
top: 50%;
left: -10px;
}
.node>.subNodes::after{
content:'';
display: block;
width: 1px;
height: 100%;
background-color: black;
position: absolute;
top: 0;
left: -5px;
z-index: 1;
}
.node>.subNodes>.node::before{
content:'';
display: block;
width: 5px;
height: 1px;
background-color: black;
position: absolute;
top: 50%;
left:-5px;
z-index: 3;
}
.node>.subNodes>.node:first-child::after{
content:'';
display: block;
width: 1px;
height: 50%;
background-color: white;
position: absolute;
top: 0;
left:-5px;
z-index: 2;
}
.node>.subNodes>.node:last-child:not(:first-child)::after{
content:'';
display: block;
width: 1px;
height: calc(50% - 1px);
background-color: white;
position: absolute;
bottom: 0;
left:-5px;
z-index: 2;
}
.node>.subNodes>.node:only-child::after{
height: 100%;
}
.node>*{
display: inline-block;
vertical-align: middle;
}
.node [type=text]{
width: 100px;
}
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.9/angular.min.js"></script>
<div ng-app="createTree" ng-controller="CreateTreeController as createTree">
<script type="text/ng-template" id="treeNode.html">
<span>
<input
type="button"
value="x"
ng-click="remove(node,parent)"
>
<a href="#">{{node.title}}</a>, parent: {{parent.title}}
<input
type="button"
value="+"
ng-click="addTo(node)"
>
</span><div class="subNodes" ng-show="node.subNodes.length>0">
<div
class="node"
ng-init="parent=node"
ng-repeat="node in node.subNodes"
ng-include="'treeNode.html'"
></div>
</div>
</script>
<div
class="node"
ng-init="parent=tree"
ng-repeat="node in tree"
ng-include="'treeNode.html'"
></div>
</div>
【问题讨论】:
-
范围内只有一个
parent变量。因此,您在每个循环中都会覆盖它。 -
@SimonSchüpbach 我打算将变量设为循环私有 - 我该如何实现?即便如此,为什么打印
parent.title打印节点本身的标题而不是其父节点的标题?ng-init会在 {{}} 语法中的内容之前执行吗?
标签: javascript angularjs angularjs-ng-repeat angularjs-ng-model