我经历了许多答案,以找出如何计算Angular JS
中的子元素数量,但我不明白。请查看我的简单代码,并建议我使用超级简单计算没有孩子的方法。
我想要计算<div id="myDiv">
下的总孩子数span
下的总<div id="myDiv">
元素数。
此处总no of child = 5
和总span elements = 3
<html>
<body ng-app="myApp" ng-controller="myCtrl">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<button ng-click="countElem()">Count</button>
<div id="myDiv">
<span>child 1</span>
<span>child 2</span>
<span>child 3</span>
<p>child 4</p>
<p>child 5</p>
</div>
<script>
var app = angular.module("myApp", []);
app.controller("myCtrl", function($scope){
});
</script>
</body>
</html>
答案 0 :(得分:6)
您可以使用querySelectorAll并获取长度
检查以下代码段
var app = angular.module("myApp", []);
app.controller("myCtrl", function($scope) {
$scope.countElem = function() {
var div = document.querySelector('#myDiv');
var spanCount = div.querySelectorAll('span').length;
var pCount = div.querySelectorAll('p').length;
console.log("spanCount" + spanCount);
console.log("pCount" + pCount);
}
});
<html>
<body ng-app="myApp" ng-controller="myCtrl">
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<button ng-click="countElem()">Count</button>
<div id="myDiv">
<span>child 1</span>
<span>child 2</span>
<span>child 3</span>
<p>child 4</p>
<p>child 5</p>
</div>
<script>
</script>
</body>
</html>
希望有所帮助
答案 1 :(得分:0)
list = [1,2,3,4]
您可以使用以下脚本:
Your HTML like this...
<div class="row">
<div class="cols">col 1</div>
<div class="cols">col 2</div>
<div class="cols">col 3</div>
</div>
<div class="row">
<div class="cols">col 1</div>
<div class="cols">col 2</div>
</div>
答案 2 :(得分:0)
我知道这是一个非常老的帖子,但这也有用
var childNum = document.querySelector('#myDiv').childElementCount;
这还会保存DOM查询