javascript - vue v-for data cannot be retrieved

Question

v-for loop cannot get data using queryselectorall

<p class="content clearfix">
            <ul>
                <li v-for='item in items' :key=item>
                    <p>
                        <img :src="item.picList[0].imgurl"  alt="item.t_name">
                        <p>{{item.title}}</p>
                        <span>{{item.datanum}}张</span>
                    </p>
                </li>
            </ul>
        </p>

created () {
            this.getData();
        },
    methods: {
            getData () {
                let _this = this;
                this.loading = true;
                this.$http.get('web/app/query.do', {
                    params: {
                        'key': '88845608c16c76ef9f4a56b12e3f238be',
                        'pageSize': '10',
                        'a_no': '001',
                        'classify': '01'
                    }
                }).then((res) => {
                    _this.items = res.body.result;
                    _this.waterfull();
                    console.log(_this.items);
                }, (err) => {
                    console.log(err);
                });
            },
            waterfull () {
                var items = document.querySelector('.content');
                var boxes = items.querySelectorAll('li');
                console.log(items);
                // var totalWidth = items.style.width;
                console.log(boxes);
                }

Answer 1

Understand the life cycle of the instance. In the created stage, the dom has not been rendered yet

Answer 2

The person above is right, you can write like this when rendering

_this.waterfull();
setTiomout(function(){
    _this.items = res.body.result;
});

This should work. If not, try filling in a time in setTimeout, milliseconds will do

Answer 3

It’s indeed a life cycle issue, but what I’m more confused about is, since vue is used, why do we need to retrieve it through Dom?

Answer 4

You can use ref to directly bind dom elements, and then use $refs to operate.