1.vue中input控制输入的数据类型
watch监听input绑定的变量,通过使用str.replace(正则表达式,要替换的字符)来解决
<input v-model="pageRoute" class="ipt" type="text" placeholder="请输入英文字母">
watch: {
pageRoute() {
this.pageRoute = this.pageRoute.replace(/[^a-zA-Z]/g, '') // 将不是英文字母的字符替换成''
}
},
2.vue中路由使用query传递参数的时候,刷新页面不会丢失,但是传递引用类型的时候,无法解析
var obj ={name:'张三'}
this.$router.push({path:'page',query:{obj})
//page页面,刷新页面之后
console.log(this.$route.query.obj) // [Object Object]
可以将对象转换成JSON字符串在传递
var obj ={name:'张三'}
this.$router.push({path:'page',query:{JSON.stringfy(obj)})
//page页面,刷新页面之后
console.log(JSON.parse(this.$route.query.obj)) // {name:'张三'}
3.在类似elementUI等框架中使用组件的时候,我们需要往组件中提供的具有默认参数的钩子函数或者回调函数中传递更多的参数,可以按以下方法实现
例如上传文件中的 on-success钩子函数
<el-upload
class="upload-demo"
:action="`${current.baseURL}/cp/file/upload?fileType=${1}`"
:on-success="(response, file, fileList) =>{
return bgPicSucesss(response, file, fileList,item)
}"
:show-file-list="false"
>
<el-button size="small" type="primary" style="width:80px;margin-top: 12px;margin-left:0;display: block">
点击上传
</el-button>
</el-upload>
4.拖拽排序实现
平时工作的时候，可选择使用类似Sortable.js这样的开源库来实现需求,官网
1.下载
cnpm install sortablejs --save
2.项目引入
// Default SortableJS
import Sortable from 'sortablejs';
3.使用
<ul id="items">
<li>item 1</li>
<li>item 2</li>
<li>item 3</li>
</ul>
var el = document.getElementById('items');
var sortable = Sortable.create(el
如何实现的呢?
{
margin: 0;
padding: 0;
box-sizing: border-box;
}
.grid {
display: flex;
flex-wrap: wrap;
margin: 0 -15px -15px 0;
touch-action: none;
user-select: none;
}
.grid-item {
width: 90px;
height: 90px;
line-height: 88px;
text-align: center;
margin: 0 15px 15px 0;
background: #FFF;
border: 1px solid #d6d6d6;
list-style: none;
}
.active {
background: #c8ebfb;
}
.clone-grid-item {
position: fixed;
left: 0;
top: 0;
z-index: 1;
width: 90px;
height: 90px;
line-height: 88px;
text-align: center;
background: #FFF;
border: 1px solid #d6d6d6;
opacity: 0.8;
list-style: none;
}
<ul class="grid">
<li class="grid-item">item1</li>
<li class="grid-item">item2</li>
<li class="grid-item">item3</li>
<li class="grid-item">item4</li>
<li class="grid-item">item5</li>
<li class="grid-item">item6</li>
<li class="grid-item">item7</li>
<li class="grid-item">item8</li>
<li class="grid-item">item9</li>
<li class="grid-item">item10</li>
</ul>
class Draggable {
constructor(options) {
this.parent = options.element; // 父级元素
this.cloneElementClassName = options.cloneElementClassName; // 克隆元素类名
this.isPointerdown = false;
this.diff = { x: 0, y: 0 }; // 相对于上一次移动差值
this.drag = { element: null, index: 0, lastIndex: 0 }; // 拖拽元素
this.drop = { element: null, index: 0, lastIndex: 0 }; // 释放元素
this.clone = { element: null, x: 0, y: 0 };
this.lastPointermove = { x: 0, y: 0 };
this.rectList = []; // 用于保存拖拽项getBoundingClientRect()方法获得的数据
this.init();
}
init() {
this.getRect();
this.bindEventListener();
}
// 获取元素位置信息
getRect() {
this.rectList.length = 0;
for (const item of this.parent.children) {
this.rectList.push(item.getBoundingClientRect());
}
}
handlePointerdown(e) {
// 如果是鼠标点击，只响应左键
if (e.pointerType === 'mouse' && e.button !== 0) {
return;
}
if (e.target === this.parent) {
return;
}
this.isPointerdown = true;
this.parent.setPointerCapture(e.pointerId);
this.lastPointermove.x = e.clientX;
this.lastPointermove.y = e.clientY;
this.drag.element = e.target;
this.drag.element.classList.add('active');
this.clone.element = this.drag.element.cloneNode(true);
this.clone.element.className = this.cloneElementClassName;
this.clone.element.style.transition = 'none';
const i = [].indexOf.call(this.parent.children, this.drag.element);
this.clone.x = this.rectList[i].left;
this.clone.y = this.rectList[i].top;
this.drag.index = i;
this.drag.lastIndex = i;
this.clone.element.style.transform = 'translate3d(' + this.clone.x + 'px, ' + this.clone.y + 'px, 0)';
document.body.appendChild(this.clone.element);
}
handlePointermove(e) {
if (this.isPointerdown) {
this.diff.x = e.clientX - this.lastPointermove.x;
this.diff.y = e.clientY - this.lastPointermove.y;
this.lastPointermove.x = e.clientX;
this.lastPointermove.y = e.clientY;
this.clone.x += this.diff.x;
this.clone.y += this.diff.y;
this.clone.element.style.transform = 'translate3d(' + this.clone.x + 'px, ' + this.clone.y + 'px, 0)';
for (let i = 0; i < this.rectList.length; i++) {
// 碰撞检测
if (e.clientX > this.rectList[i].left && e.clientX < this.rectList[i].right &&
e.clientY > this.rectList[i].top && e.clientY < this.rectList[i].bottom) {
this.drop.element = this.parent.children[i];
this.drop.lastIndex = i;
if (this.drag.element !== this.drop.element) {
if (this.drag.index < i) {
this.parent.insertBefore(this.drag.element, this.drop.element.nextElementSibling);
this.drop.index = i - 1;
} else {
this.parent.insertBefore(this.drag.element, this.drop.element);
this.drop.index = i + 1;
}
this.drag.index = i;
const dragRect = this.rectList[this.drag.index];
const lastDragRect = this.rectList[this.drag.lastIndex];
const dropRect = this.rectList[this.drop.index];
const lastDropRect = this.rectList[this.drop.lastIndex];
this.drag.lastIndex = i;
this.drag.element.style.transition = 'none';
this.drop.element.style.transition = 'none';
this.drag.element.style.transform = 'translate3d(' + (lastDragRect.left - dragRect.left) + 'px, ' + (lastDragRect.top - dragRect.top) + 'px, 0)';
this.drop.element.style.transform = 'translate3d(' + (lastDropRect.left - dropRect.left) + 'px, ' + (lastDropRect.top - dropRect.top) + 'px, 0)';
this.drag.element.offsetLeft; // 触发重绘
this.drag.element.style.transition = 'transform 150ms';
this.drop.element.style.transition = 'transform 150ms';
this.drag.element.style.transform = 'translate3d(0px, 0px, 0px)';
this.drop.element.style.transform = 'translate3d(0px, 0px, 0px)';
}
break;
}
}
}
}
handlePointerup(e) {
if (this.isPointerdown) {
this.isPointerdown = false;
this.drag.element.classList.remove('active');
this.clone.element.remove();
}
}
handlePointercancel(e) {
if (this.isPointerdown) {
this.isPointerdown = false;
this.drag.element.classList.remove('active');
this.clone.element.remove();
}
}
bindEventListener() {
this.handlePointerdown = this.handlePointerdown.bind(this);
this.handlePointermove = this.handlePointermove.bind(this);
this.handlePointerup = this.handlePointerup.bind(this);
this.handlePointercancel = this.handlePointercancel.bind(this);
this.getRect = this.getRect.bind(this);
this.parent.addEventListener('pointerdown', this.handlePointerdown);
this.parent.addEventListener('pointermove', this.handlePointermove);
this.parent.addEventListener('pointerup', this.handlePointerup);
this.parent.addEventListener('pointercancel', this.handlePointercancel);
window.addEventListener('scroll', this.getRect);
window.addEventListener('resize', this.getRect);
window.addEventListener('orientationchange', this.getRect);
}
unbindEventListener() {
this.parent.removeEventListener('pointerdown', this.handlePointerdown);
this.parent.removeEventListener('pointermove', this.handlePointermove);
this.parent.removeEventListener('pointerup', this.handlePointerup);
this.parent.removeEventListener('pointercancel', this.handlePointercancel);
window.removeEventListener('scroll', this.getRect);
window.removeEventListener('resize', this.getRect);
window.removeEventListener('orientationchange', this.getRect);
}
}
// 实例化
new Draggable({
element: document.querySelector('.grid'),
cloneElementClassName: 'clone-grid-item'
});
为何不使用HTML拖放API实现？
因为原生HTML拖放API在移动端无法使用，所以为了兼容PC端和移动端，使用了PointerEvent事件实现拖拽逻辑。
5.overflow:auto没有出现滚动条,需要给滚动的元素指定高度
