Vue使用Element折叠面板Collapse如何设置默认全部展开
作者：suzhiwei_boke
这篇文章主要介绍了Vue使用Element折叠面板Collapse如何设置默认全部展开，具有很好的参考价值，希望对大家有所帮助。如有错误或未考虑完全的地方，望不吝赐教
Element折叠面板Collapse设置默认全部展开
这个适用于需要for循环 <el-collapse-item>
负责展开的属性是value
<el-collapse :value="opened">
<el-collapse-item v-for="o in List" :key="o.aaa":name="o.aaa">
<div>XXXXXXXXXXXXXXXXXXXXXXXX</div>
</el-collapse-item>
</el-collapse>
<script>
export default {
data() {
return {
List:[
{
aaa:"123"
},
{
aaa:"354"
},
{
aaa:"asfdvg"
}
]
};
},
computed: {
opened() {
return this.List.map((i) => {
return i.aaa;
});
}
},
}
</script>:name 只要是子元素的唯一属性即可
这时会有一个bug，当页面有数据发生变动时，这个折叠就会重新刷新，造成体验感变差的现象
Vue实现展开折叠效果
1、创建collapse.js文件
const elTransition =
"0.3s height ease-in-out, 0.3s padding-top ease-in-out, 0.3s padding-bottom ease-in-out";
const Transition = {
"before-enter"(el) {
el.style.transition = elTransition;
if (!el.dataset) el.dataset = {};
el.dataset.oldPaddingTop = el.style.paddingTop;
el.dataset.oldPaddingBottom = el.style.paddingBottom;
el.style.height = 0;
el.style.paddingTop = 0;
el.style.paddingBottom = 0;
},
enter(el) {
el.dataset.oldOverflow = el.style.overflow;
if (el.scrollHeight !== 0) {
el.style.height = el.scrollHeight + "px";
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
} else {
el.style.height = "";
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
}
el.style.overflow = "hidden";
},
"after-enter"(el) {
el.style.transition = "";
el.style.height = "";
el.style.overflow = el.dataset.oldOverflow;
},
"before-leave"(el) {
if (!el.dataset) el.dataset = {};
el.dataset.oldPaddingTop = el.style.paddingTop;
el.dataset.oldPaddingBottom = el.style.paddingBottom;
el.dataset.oldOverflow = el.style.overflow;
el.style.height = el.scrollHeight + "px";
el.style.overflow = "hidden";
},
leave(el) {
if (el.scrollHeight !== 0) {
el.style.transition = elTransition;
el.style.height = 0;
el.style.paddingTop = 0;
el.style.paddingBottom = 0;
}
},
"after-leave"(el) {
el.style.transition = "";
el.style.height = "";
el.style.overflow = el.dataset.oldOverflow;
el.style.paddingTop = el.dataset.oldPaddingTop;
el.style.paddingBottom = el.dataset.oldPaddingBottom;
}
};
export default {
name: "collapseTransition",
functional: true,
render(h, { children }) {
const data = {
on: Transition
};
return h("transition", data, children);
}
};2、在.vue组件中引入
<template>
<div class="container">
<button @click="isActive = !isActive">展开/折叠</button>
<collapse>
<div v-show="isActive">
<div style="border:1px solid #ddd;padding:10px;">
<h2>欢迎大家品尝Pizza!</h2>
<h5>这里有你非常喜欢的Pizza!</h5>
</div>
</div>
</collapse>
<div>
666
</div>
</div>
</template>
<script>
import collapse from "#/assets/js/collapse.js";
export default {
data() {
return {
isActive: false
};
},
components: {
collapse
}
};
</script>总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。