问题描述
我可以使用 v-if 有条件地呈现结束标记吗?如果是，那么正确的做法是什么?我的第一直觉是:
<td class="days">{{day.number}}</td><模板 v-if="day.isSunday"></tr><tr>这本身就有效，但它不会呈现 </tr><tr> 原始 - 这是预期的行为吗?
如果这是不可能的 - 有条件地打破表格行的最佳方法是什么?
我的具体情况是 - 数组中的月份中的天数，并为其提供附加信息.每天都有一个 isSunday 属性，我想在每个星期日之后开始一个新行 (模仿日历行为)
通常我建议将所有逻辑放在脚本中，并且只在模板部分使用属性和调用方法，因此对于这种情况，我将定义一个computed 称为 cptDays 的属性，在其中我循环遍历 days 数组，当我遇到正常的一天时，如果当天是Sunday 我推送它并增加周数，最后我返回 month 数组，我在模板中循环遍历它.
注意
我使用了 bootstrap 中的 CSS 来提供漂亮的外观，您可以将其删除并且不会更改您的代码
new Vue({el: '#app',数据: {天: [{1号，isSunday":假},{2号，isSunday":假},{数量":3，isSunday":假},{数量":4，isSunday":假},{数量":5，isSunday":假},{数量":6，isSunday":假},{数量":7，"isSunday": 真},{数字":8，isSunday":假},{数字":9，isSunday":假},{数量":10，isSunday":假},{数字":11，isSunday":假},{数字":12，isSunday":假},{数字":13，isSunday":假},{数量":14，"isSunday": 真},{数量":15，isSunday":假},{数字":16，isSunday":假},{数字":17，isSunday":假},{数字":18，isSunday":假},{数字":19，isSunday":假},{数量":20，isSunday":假},{数字":21，"isSunday": 真},{数量":22，isSunday":假},{数量":23，isSunday":假},{数字":24，isSunday":假},{数字":25，isSunday":假},{数字":26，isSunday":假},{数字":27，isSunday":假},{数字":28，"isSunday": 真},{数字":29，isSunday":假},{数量":30，isSunday":假},{数字":31，isSunday":假}]},计算:{cptDays() {让月份 = [],我 = 0;this.days.forEach((day) => {如果 (!day.isSunday) {如果(月 [i] == 未定义){月[i] = [];月 [i].push(day)} 别的 {月 [i].push(day)}} 别的 {月 [i].push(day)我++;}});返回月份；}}})<头><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/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwgnJ8ER"cross;<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.2.1/vue.min.js"></script><身体><div id="应用程序"><table class="table table-striped"><头><tr><th>周一</th><th>周二</th><th>周三</th><th>Thi</th><th>周五</th><th>周六</th><th>Sun</th></tr></thead><tr v-for="cptDays 中的周"><td v-for="星期几">{{day.number}}</td></tr></tbody>Can I render closing tag conditionally with v-if? And if yes, what's the right way to do it? My first instinct was this:
<template v-for="day in days">
<td class="days">{{day.number}}</td>
<template v-if="day.isSunday">
</tr>
<tr>
</template>
</template>
This works on its own, but it wont render </tr><tr> raw - is this expected behavior?
And if this is impossible - what is the best way to break a table row conditionally?
My specific case is - days of the month in an array with additional info for them. Each day has a isSunday property and I want to start a new row after each Sunday (imitating calendar behavior)
解决方案 Usually I recommend to put the all logic in your script and only use properties and call methods in the template section, so for this case I'm gonna define a computed property called cptDays in which I loop through the days array and when I meet a normal day I push it in a week if the day is Sunday I push it and I increment the number of weeks, in the end I return the month array which I loop through it in my template.
Note
I used CSS from bootstrap to give a pretty look, you could remove it and your code will not be changed
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
}
]
},
computed: {
cptDays() {
let month = [],
i = 0;
this.days.forEach((day) => {
if (!day.isSunday) {
if (month[i] == undefined) {
month[i] = [];
month[i].push(day)
} else {
month[i].push(day)
}
} else {
month[i].push(day)
i++;
}
});
return month;
}
}
})
<!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 v-for="week in cptDays">
<td v-for="day in week ">{{day.number}}</td>
</tr>
</tbody>
</table>
</div>
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08-18 09:05