在单个文件组件中,我创建了一个复选框数组:
<label
v-for="(category, index) in categories"
:key="index"
>
<input type="checkbox" :value="category.value"
@change="emitSearchValue">
<span class="ml-2 text-gray-700 capitalize">{{ category.value }}</span>
</label>
使用EventBus,我将数据传输到列表组件:
methods: {
emitSearchValue() {
EventBus.$emit('checked-value', 'this.checkedCategories')
}
}
在列表组件中,我监听EventBus:
created() {
EventBus.$on('checked-value', (checkedCategories) => {
this.checkedvalue = checkedCategories;
})
}
然后我的计算属性如下:
computed: {
filteredData() {
return this.blogs.filter(blog =>
// if there are no checkboxes checked. all values will pass otherwise the category must be included
!this.checkedCategories.length || this.checkedCategories.includes(blog.category)
)
}
},
在控制台中,我得到:
[Vue warn]: Error in render: "TypeError: Cannot read property 'length' of undefined"
这里是指向sandbox的链接。
这里怎么了?
将计算出的道具filteredData
更改为:
computed: {
filteredData() {
if(!this.checkedvalue.length) return this.experiences
return this.experiences.filter(experience =>
this.checkedvalue.includes(experience.category)
);
}
}