Vue.js -在v-for内部使用过滤器
Vue.js -在v-for内部使用过滤器
提问于 2018-12-06 03:40:17
我有一个简单的Vue过滤器，它将数组的长度限制为n个元素。像这样使用它可以很好地工作：
{{ array | limitArray(2) }}
现在我想在v-for循环中使用它，如下所示：
<li v-for="item in items | limitArray(3)">...</li>
但这会抛出错误。如何在v-for中使用筛选器
编辑:可能不重要，但有问题的过滤器：
Vue.filter('limitArray', function (arr, length = 3) {
if (arr && arr.length) {
if (length == -1) {
return arr;
}
if (length > arr.length) {
return arr;
}
return arr.slice(0, length);
}
return null;
});回答 3
Stack Overflow用户
回答已采纳
发布于 2018-12-06 07:25:49
你必须将过滤器作为一个方法来调用：
<li v-for="item in $options.filters.limitArray(items, 3)">Stack Overflow用户
发布于 2018-12-06 04:01:08
您可以使用method而不是filter：
<li v-for="item in limitArray(items,3)">...</li>在你的方法中：
methods:{
limitArray (arr, length = 3) {
if (arr && arr.length) {
if (length == -1) {
return arr;
}
if (length > arr.length) {
return arr;
}
return arr.slice(0, length);
}
return null;
}
...
}完整示例
new Vue({
el: '#app',
data: {
days: [{
"number": 1,
"isSunday": false
},
{
"number": 2,
"isSunday": false
},
{
"number": 3,
"isSunday": false
},
{
"number": 4,
"isSunday": false
},
{
"number": 5,
"isSunday": false
},
{
"number": 6,
"isSunday": false
},
{
"number": 7,
"isSunday": true
},
{
"number": 8,
"isSunday": false
},
{
"number": 9,
"isSunday": false
},
{
"number": 10,
"isSunday": false
},
{
"number": 11,
"isSunday": false
},
{
"number": 12,
"isSunday": false
},
{
"number": 13,
"isSunday": false
},
{
"number": 14,
"isSunday": true
},
{
"number": 15,
"isSunday": false
},
{
"number": 16,
"isSunday": false
},
{
"number": 17,
"isSunday": false
},
{
"number": 18,
"isSunday": false
},
{
"number": 19,
"isSunday": false
},
{
"number": 20,
"isSunday": false
},
{
"number": 21,
"isSunday": true
},
{
"number": 22,
"isSunday": false
},
{
"number": 23,
"isSunday": false
},
{
"number": 24,
"isSunday": false
},
{
"number": 25,
"isSunday": false
},
{
"number": 26,
"isSunday": false
},
{
"number": 27,
"isSunday": false
},
{
"number": 28,
"isSunday": true
},
{
"number": 29,
"isSunday": false
},
{
"number": 30,
"isSunday": false
},
{
"number": 31,
"isSunday": false
}
]
},
methods: {
limitArray(arr, length = 3) {
if (arr && arr.length) {
if (length == -1) {
return arr;
}
if (length > arr.length) {
return arr;
}
return arr.slice(0, length);
}
return null;
}
}
})<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Vue.delete">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.2.1/vue.min.js"></script>
</head>
<body>
<div id="app">
<table class="table table-striped">
<thead>
<tr>
<th>Mon</th>
<th>Tue</th>
<th>Wed</th>
<th>Thi</th>
<th>Fri</th>
<th>Sat</th>
<th>Sun</th>
</tr>
</thead>
<tbody>
<tr>
<td v-for="day in limitArray(days,7)">
{{day.number}}
</td>
</tr>
</tbody>
</table>
</div>
Stack Overflow用户
发布于 2019-10-17 16:30:18
我认为你应该这样做：
<li v-for="item in $options.filter(v => dosomething)">页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/53639575
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