版本
vue 2.9.6
element-ui: 2.15.6
目标效果
说明
在 vue 2.x 中，在一个元素上同时使用 v-if 和 v-for 时，v-for 会优先作用
解决方法
选择性地渲染列表，例如根据某个特定属性（category ）来决定不同展示渲染，使用计算属性computed使用template占位，将循环放在template中，v-if作用于元素，此方法script中不用定义computed方法，见 https://www.jb51.net/article/247179.htm
核心代码片段
# html
...
<el-divider content-position="left">奥迪</el-divider>
<el-link type="primary" v-for="(item, index) in links0" :key="index" :href="item.url" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<el-button type="primary">{{item.name}}</el-button>
</el-link>
...
# script
...
computed: {
links0: function() {
return this.links.filter((item) => {
return item.category === 0
})
},
links1: function() {
return this.links.filter((item) => {
return item.category === 1
})
},
links2: function() {
return this.links.filter((item) => {
return item.category === 2
})
}
},Car.vue
<template>
<div>
<el-row>
<el-col :span="24">
<el-form :inline="true" class="user-search">
<el-form-item>
<el-button size="small" type="primary" icon="el-icon-plus" @click="handleEdit()" plain>添加链接</el-button>
</el-form-item>
</el-form>
<div >
<el-divider content-position="left">奥迪</el-divider>
<el-link type="primary" v-for="(item, index) in links0" :key="index" :href="item.url" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<el-button type="primary">{{item.name}}</el-button>
</el-link>
<el-divider content-position="left">奔驰</el-divider>
<el-link type="primary" v-for="(item, index) in links1" :key="index" :href="item.url" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<el-button type="primary">{{item.name}}</el-button>
</el-link>
<el-divider content-position="left">宝马</el-divider>
<el-link type="primary" v-for="(item, index) in links2" :key="index" :href="item.url" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
<el-button type="primary">{{item.name}}</el-button>
</el-link>
</div>
<!-- 添加界面 -->
<el-dialog :title="title" :visible.sync="editFormVisible" width="30%" @click="closeDialog">
<el-form label-width="120px" :model="editForm" :rules="rules" ref="editForm">
<el-form-item label="链接名称" prop="name">
<el-input size="small" v-model="editForm.name" auto-complete="off" placeholder="请输入链接名称"></el-input>
</el-form-item>
<el-form-item label="链接地址" prop="url">
<el-input size="small" v-model="editForm.url" auto-complete="off" placeholder="请输入链接地址"></el-input>
</el-form-item>
</el-form>
<div slot="footer" class="dialog-footer">
<el-button size="small" @click="closeDialog">取消</el-button>
<el-button size="small" type="primary" :loading="loading" class="title" @click="submitForm('editForm')">保存</el-button>
</div>
</el-dialog>
</el-col>
</el-row>
</div>
</template>
<script>
import { getLink, saveLink } from '../../api/userMG'
export default {
data() {
return {
links: [],
loading: false, //显示加载
editFormVisible: false, //控制添加页面显示与隐藏
title: '添加链接',
editForm: {
name: '',
url: ''
},
// rules表单验证
rules: {
name: [{ required: true, message: '请输入链接名称', trigger: 'blur' }],
url: [{ required: true, message: '请输入链接地址', trigger: 'blur' }]
},
}
},
computed: {
// 通过根据category属性来不同显示
links0: function() {
return this.links.filter((item) => {
return item.category === 0
})
},
links1: function() {
return this.links.filter((item) => {
return item.category === 1
})
},
links2: function() {
return this.links.filter((item) => {
return item.category === 2
})
}
},
created() {
// 获取链接
this.getdata()
},
// 这下面的方法只有被调用才会被执行
methods: {
// 获取链接
getdata() {
this.loading = true
getLink().then((response) => {
this.loading = false
console.log(response.data)
this.links = response.data
}).catch(error => {
console.log(error)
})
},
// 添加页面方法
handleEdit: function() {
this.editFormVisible = true
this.title = '添加链接',
this.editForm.name = '',
this.editForm.url = ''
},
// 添加保存页面方法
submitForm(editData) {
this.$refs[editData].validate(valid => {
if (valid) {
saveLink(this.editForm).then(response => {
this.editFormVisible = false
this.loading = false
// if (response.success)
this.getdata()
this.$message({
type: 'success',
message: '链接添加成功'
})
}).catch(error => {
this.editFormVisible = false
this.loading = false
// console.log(error.response.data['url'][0])
// console.log(error.response.status)
// this.$message.error('链接添加失败，请稍后再试')
if (error.response.status == 400 ) {
this.$message.error(error.response.data['url'][0]+'如: http://xxx 或 https://xxx')
}else {
this.$message.error('链接添加失败，请稍后再试')
}
})
}
})
},
// 关闭添加链接窗口
closeDialog() {
this.editFormVisible = false
}
}
}
</script>
<style>
.el-link {
margin-right: 5px;
}
</style>到此这篇关于vue中v-for和v-if一起使用之使用compute的文章就介绍到这了,更多相关vue v-for和v-if一起使用内容请搜索编程网以前的文章或继续浏览下面的相关文章希望大家以后多多支持编程网！
