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多行标签展示收起.html
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多行标签展示收起.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>多个标签超出隐藏</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
padding: 0 16px;
}
.title {
text-align: center;
margin: 40px auto 0;
}
.list-con {
max-width: 375px;
height: 62px;
margin: 20px auto 0;
overflow: hidden;
/* border: 1px solid red;*/
display: flex;
flex-wrap: wrap;
}
.list-con-3,
.list-con-4 {
height: 62px;
}
.list-expand {
height: auto;
}
.label {
max-width: 132px;
max-width: calc(100% - 72px);
height: 24px;
border-radius: 22px;
background: #ecf2fe;
color: #0052d9;
font-size: 10px;
line-height: 24px;
text-align: center;
padding: 0 12px;
margin: 0 8px 8px 0;
white-space: nowrap;
text-overflow: ellipsis;
overflow: hidden;
}
.expand {
width: 50px;
font-size: 12px;
color: #666;
text-align: center;
margin: 5px auto;
/* cursor: pointer;*/
}
.expand-btn {
max-width: 100px;
/* cursor: pointer;*/
margin-right: 0;
}
</style>
</head>
<body>
<p class="title">样式一（按钮与容器分开）：通过第一个标签偏移值判断</p>
<div class="list-con list-con-1">
<div class="label">人工智能</div>
<div class="label">人工智能与应用</div>
<div class="label">行业分析与市场数据</div>
<div class="label">标签标签标签标签标签标签标签标签</div>
<div class="label">标签</div>
<div class="label">啊啊啊</div>
<div class="label">宝宝贝贝</div>
<div class="label">微信</div>
<div class="label">吧啊啊</div>
<div class="label">哦哦哦哦哦哦哦哦</div>
</div>
<div class="expand expand-1">展开 ∨</div>
<script>
/*
方法一： 通过第一个标签左偏移值对比，如果有几个相同则说明有几个换行
*/
const listCon = document.querySelector(".list-con-1");
const expandBtn = document.querySelector(".expand-1");
console.log(listCon.children);
// HTMLCollection对象 item()、namedItem()方法 length属性
let firstLabelOffsetLeft = 0; // 第一个标签左侧偏移
let line = 1; // 记录行
const len = listCon.children.length;
for (let i = 0; i < len; i++) {
const _offsetLeft = listCon.children.item(i).offsetLeft;
if (i === 0) {
firstLabelOffsetLeft = _offsetLeft;
} else if (firstLabelOffsetLeft === _offsetLeft) {
line++;
console.log(line + "行");
}
}
// 如果大于一行则隐藏
if (line > 2) {
expandBtn.style = "display: show";
} else {
expandBtn.style = "display: none";
}
expandBtn.addEventListener("click", () => {
const _classList = listCon.classList;
if (_classList.contains("list-expand")) {
expandBtn.innerHTML = "展开 ∨";
} else {
expandBtn.innerHTML = "收起 ∧";
}
_classList.toggle("list-expand"); // 这个更简洁
});
</script>
<p class="title">样式一（按钮与容器分开）： 通过高度判断</p>
<div class="list-con list-con-2">
<div class="label">人工智能</div>
<div class="label">人工智能与应用</div>
<div class="label">行业分析与市场数据</div>
<div class="label">标签标签标签标签标签标签标签标签</div>
<div class="label">标签</div>
<div class="label">啊啊啊</div>
<div class="label">宝宝贝贝</div>
<div class="label">微信</div>
<div class="label">吧啊啊</div>
<div class="label">哦哦哦哦哦哦哦哦</div>
</div>
<div class="expand expand-2">展开 ∨</div>
<script>
console.log("-----------样式1：高度比较--------------");
/*
方法二： 通过计算标签上top距离是否大于容器高
这种方法有个条件 就是必须要设定容器高度
*/
const listCon2 = document.querySelector(".list-con-2");
const expandBtn2 = document.querySelector(".expand-2");
console.log(listCon2.children);
const listCon2Height = listCon2.getBoundingClientRect().bottom;
console.log(listCon2Height);
const len2 = listCon2.children.length;
for (let i = 0; i < len2; i++) {
// console.log(listCon2.children.item(i).offsetWidth)
const _top = listCon2.children.item(i).getBoundingClientRect().top;
// 通过宽度判断如果所有标签大于容器则隐藏
if (_top >= listCon2Height) {
expandBtn2.style = "display: show";
break;
} else {
expandBtn2.style = "display: none";
}
}
expandBtn2.addEventListener("click", () => {
const _classList = listCon2.classList;
// console.log(_classList)
if (_classList.contains("list-expand")) {
expandBtn2.innerHTML = "展开 ∨";
} else {
expandBtn2.innerHTML = "收起 ∧";
}
_classList.toggle("list-expand");
});
</script>
<p class="title">样式二： 展开隐藏按钮和标签同级 - 通过高度判断</p>
<div id="app3">
<div class="list-con list-con-3" :class="{'list-expand': isExpand}">
<div class="label" v-for="item in labelArr.slice(0, labelLength)">
{{ item }}
</div>
<div
class="label expand-btn"
v-if="showExpandBtn"
@click="changeExpand"
>
{{ !isExpand ? '展开 ▼' : '隐藏 ▲' }}
</div>
</div>
</div>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
console.log("------------样式2：高度判断---------------");
/*
方法一： 通过计算所有标记宽度与容器宽比较，如果超出容器宽的n倍则表示标签大于n行需隐藏？？？
似乎行不通 如果剩余空白较大就无法计算了
方法二： 通过容器底部与标签top比较，如果有top值大于容器顶部bottom则表示超出容器隐藏
*/
const { createApp, nextTick } = Vue;
createApp({
props: {
maxLine: {
type: Number,
default: 2,
},
},
data() {
return {
labelArr: [],
isExpand: false,
showExpandBtn: false,
labelLength: 0,
hideLength: 0,
};
},
mounted() {
const labels = [
"人工智能",
"人工智能与应用",
"行业分析与市场数据",
"标签标签标签标签标签标签标签",
"标签A",
"啊啊啊",
"宝宝贝贝",
"微信",
"吧啊啊",
"哦哦哦哦哦哦哦哦",
"人工智能",
"人工智能与应用",
];
this.labelArr = labels;
this.labelLength = labels.length;
nextTick(() => {
this.init();
});
},
methods: {
init() {
const listCon = document.querySelector(".list-con-3");
const labels = listCon.querySelectorAll(".label:not(.expand-btn)");
const expandBtn = listCon.querySelector(".expand-btn");
let labelIndex = 0; // 渲染到第几个
const listConBottom = listCon.getBoundingClientRect().bottom; // 容器底部距视口顶部距离
for (let i = 0; i < labels.length; i++) {
const _top = labels[i].getBoundingClientRect().top;
if (_top >= listConBottom) {
// 如果有标签顶部距离超过容器底部则表示超出容器隐藏
this.showExpandBtn = true;
console.log("第几个索引标签停止", i);
labelIndex = i;
// this.hideLength = i
break;
} else {
this.showExpandBtn = false;
}
}
if (!this.showExpandBtn) {
return;
}
nextTick(() => {
const listConRect = listCon.getBoundingClientRect();
const expandBtn = listCon.querySelector(".expand-btn");
const expandBtnWidth = expandBtn.getBoundingClientRect().width;
const labelMaringRight = parseInt(
window.getComputedStyle(labels[0]).marginRight
);
for (let i = labelIndex - 1; i >= 0; i--) {
const labelRight =
labels[i].getBoundingClientRect().right - listConRect.left;
if (
labelRight + labelMaringRight + expandBtnWidth <=
listConRect.width
) {
this.hideLength = i + 1;
this.labelLength = this.hideLength;
break;
}
}
});
},
changeExpand() {
this.isExpand = !this.isExpand;
console.log(this.labelLength);
if (this.isExpand) {
this.labelLength = this.labelArr.length;
} else {
this.labelLength = this.hideLength;
}
},
},
}).mount("#app3");
</script>
<p class="title">样式二： 展开隐藏按钮和标签同级 - 通过计算行数判断</p>
<div id="app4">
<div class="list-con list-con-4" :class="{'list-expand': isExpand}">
<div class="label" v-for="item in labelList.slice(0, labelLength)">
{{ item }}
</div>
<div
class="label expand-btn"
v-if="showExpandBtn"
@click="changeExpand"
>
{{ !isExpand ? '展开 ▼' : '隐藏 ▲' }}
</div>
</div>
</div>
<!-- <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script> -->
<script>
console.log("-------------样式2：通过行判断--------------");
/*
方法二： 通过所有标签与第一个标签左偏移值比较，有几个相同的则表示有几行
情况1： 标签宽度如果不限制, 则会出现标签和按钮大于容器的情况，所以要限制宽度
*/
// const { createApp, nextTick } = Vue
createApp({
data() {
return {
labelList: [],
isExpand: false,
showExpandBtn: false,
labelLength: 0,
hideLength: 0,
};
},
mounted() {
const labels = [
"人工智能",
"人工智能与应用",
"行业分析与市场数据报告行业分析与市场数据报告",
"标签标签标签标签标签标签标签",
"标签A",
"啊啊啊",
"宝宝贝贝",
"微信",
"吧啊啊",
"哦哦哦哦哦哦哦哦",
"人工智能",
"人工智能与应用",
];
this.labelList = labels;
this.labelLength = labels.length;
nextTick(() => {
this.init();
});
},
methods: {
init() {
const listCon = document.querySelector(".list-con-4");
const labels = listCon.querySelectorAll(".label:not(.expand-btn)");
const firstLabelOffsetLeft = labels[0].getBoundingClientRect().left; // 第一个标签左侧偏移量
const labelMaringRight = parseInt(
window.getComputedStyle(labels[0]).marginRight
);
let line = 0; // 几行
let labelIndex = 0; // 渲染第几个
for (let i = 0; i < labels.length; i++) {
const _offsetLeft = labels[i].getBoundingClientRect().left;
if (firstLabelOffsetLeft === _offsetLeft) {
line += 1;
}
console.log(line, i);
if (line > 2) {
this.showExpandBtn = true;
labelIndex = i;
// this.labelLength = this.hideLength
break;
} else {
this.showExpandBtn = false;
}
}
if (!this.showExpandBtn) {
return;
}
nextTick(() => {
const listConRect = listCon.getBoundingClientRect();
const expandBtn = listCon.querySelector(".expand-btn");
console.log(listConRect, expandBtn.getBoundingClientRect());
const expandBtnWidth = expandBtn.getBoundingClientRect().width;
for (let i = labelIndex - 1; i >= 0; i--) {
console.log(labels[i]);
const labelRight =
labels[i].getBoundingClientRect().right - listConRect.left;
console.log(labelRight, expandBtnWidth, labelMaringRight);
if (
labelRight + labelMaringRight + expandBtnWidth <=
listConRect.width
) {
this.hideLength = i + 1;
this.labelLength = this.hideLength;
break;
}
}
});
},
changeExpand() {
this.isExpand = !this.isExpand;
if (this.isExpand) {
this.labelLength = this.labelList.length;
} else {
this.labelLength = this.hideLength;
}
},
},
}).mount("#app4");
</script>
</body>
</html>