Vue@某人，At某人，仿新浪微博@某人，@user，艾特，艾特某人

vue-atuser

Vue@某人，At某人，仿新浪微博@某人，@user

vue-edit

Vue实现渲染数据后控制滚动条位置 📜

Element.scrollIntoView()

Element.scrollIntoView()    // 如果为false，元素的底端将和其所在滚动区的可视区域的底端对齐。

Web聊天工具的富文本输入框

div+contenteditable 实现富文本发布框的小结

实现高度“听话”的多行文本输入框

原生js 实现输入框emoji表情发布

获取光标位置,设置光标位置

Vue实现字符串中自定义标识符的解析渲染 🎩

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/**
 * 获取光标位置
 * @param {DOMElement} element 输入框的dom节点
 * @return {Number} 光标位置
 */
export const getCursorPosition = (element) => {
  let caretOffset = 0
  const doc = element.ownerDocument || element.document
  const win = doc.defaultView || doc.parentWindow
  const sel = win.getSelection()
  if (sel.rangeCount > 0) {
    const range = win.getSelection().getRangeAt(0)
    const preCaretRange = range.cloneRange()
    preCaretRange.selectNodeContents(element)
    preCaretRange.setEnd(range.endContainer, range.endOffset)
    caretOffset = preCaretRange.toString().length
  }
  return caretOffset
}
 
/**
 * 设置光标位置
 * @param {DOMElement} element 输入框的dom节点
 * @param {Number} cursorPosition 光标位置的值
 */
export const setCursorPosition = (element, cursorPosition) => {
  const range = document.createRange()
  range.setStart(element.firstChild, cursorPosition)
  range.setEnd(element.firstChild, cursorPosition)
  const sel = window.getSelection()
  sel.removeAllRanges()
  sel.addRange(range)
}

　　

Vue实现图片与文字混输 🔥

DEMO

atuser.vue

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<template>
    <div ref="wrap" class="atwho-wrap" @input="handleInput" @keydown="handleKeyDown">
        <div v-if="atwho" class="atwho-panel" :style="style">
            <ul class="atwho-view atwho-ul">
                <li v-for="(item, index) in atwho.list" class="atwho-li" :key="index" :class="isCur(index) && 'atwho-cur'" :ref="isCur(index) && 'cur'" :data-index="index" @mouseenter="handleItemHover" @click="handleItemClick">
                    <span v-text="item"></span>
                </li>
                <li>
                    <span>展开更多群成员</span>
                    <img src="data:image/svg+xml;base64,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" />
                </li>
            </ul>
        </div>
        <slot></slot>
    </div>
</template>
 
<script>
    import getCaretCoordinates from 'textarea-caret'
    export default {
        props: {
            value: { //输入框初始值
                type: String,
                default: null
            },
            suffix: { //插入字符链接
                type: String,
                default: ' '
            },
            loop: { //上下箭头循环
                type: Boolean,
                default: true
            },
            avoidEmail: { //@前不能是字符
                type: Boolean,
                default: true
            },
            hoverSelect: { //悬浮选中
                type: Boolean,
                default: true
            },
            members: { //选择框选项列表
                type: Array,
                default: () => []
            },
            nameKey: {
                type: String,
                default: ''
            }
        },
 
        data() {
            return {
                atItems: ['@'],
                bindsValue: this.value != null,
                atwho: null
            }
        },
        computed: {
            style() {
                if(this.atwho) {
                    const {
                        list,
                        cur,
                        x,
                        y
                    } = this.atwho
                    const {
                        wrap
                    } = this.$refs
                    const el = this.$el.querySelector('textarea')
                    if(wrap) {
                        const left = x + el.offsetLeft - el.scrollLeft + 'px'
                        const top = y + el.offsetTop - el.scrollTop + 25 + 'px'
                        return {
                            left,
                            top
                        }
                    }
                }
                return null
            }
        },
        watch: {
            members() {
                this.handleInput(true)
            },
            value(value, oldValue) {
                if(this.bindsValue) {
                    this.handleValueUpdate(value)
                }
            }
        },
        mounted() {
            if(this.bindsValue) {
                this.handleValueUpdate(this.value)
            }
        },
 
        methods: {
            getAtAndIndex(text, ats) {
                return ats.map((at) => {
                    return {
                        at,
                        index: text.lastIndexOf(at)
                    }
                }).reduce((a, b) => {
                    return a.index > b.index ? a : b
                })
            },
            isCur(index) {
                return index === this.atwho.cur
            },
            handleValueUpdate(value) { //更新textarea的值
                const el = this.$el.querySelector('textarea')
                if(value !== el.value) {
                    el.value = value
                }
            },
            handleItemHover(e) {
                if(this.hoverSelect) {
                    this.selectByMouse(e)
                }
            },
            handleItemClick(e) {
                this.selectByMouse(e)
                this.insertItem()
            },
            handleKeyDown(e) {
                const {
                    atwho
                } = this
                if(atwho) {
                    if(e.keyCode === 38 || e.keyCode === 40) { // ↑/↓
                        if(!(e.metaKey || e.ctrlKey)) {
                            e.preventDefault()
                            e.stopPropagation()
                            this.selectByKeyboard(e)
                        }
                        return
                    }
                    if(e.keyCode === 13) { // enter
                        this.insertItem()
                        e.preventDefault()
                        e.stopPropagation()
                        return
                    }
                    if(e.keyCode === 27) { // esc
                        this.closePanel()
                        return
                    }
                }
                // 为了兼容ie ie9~11 editable无input事件 只能靠keydown触发 textarea正常
                // 另 ie9 textarea的delete不触发input
                const isValid = e.keyCode >= 48 && e.keyCode <= 90 || e.keyCode === 8
                if(isValid) {
                    setTimeout(() => {
                        this.handleInput()
                    }, 50)
                }
                if(e.keyCode === 8) { //删除
                    //this.handleDelete(e)
                }
                if(e.keyCode === 13) { //删除
                    this.$emit("enterSend",e)
                }
            },
 
            handleInput(event) {
                const el = this.$el.querySelector('textarea')
                this.$emit('input', el.value)      //更新父组件
                const text = el.value.slice(0, el.selectionEnd)
                if(text) {
                    const {
                        atItems,
                        avoidEmail
                    } = this
                    let show = true
                    const {
                        at,
                        index
                    } = this.getAtAndIndex(text, atItems)
                    if(index < 0) show = false
                    const prev = text[index - 1] //上一个字符
                    const chunk = text.slice(index + at.length, text.length)
                    if(avoidEmail) { //上一个字符不能为字母数字 避免与邮箱冲突，微信则是避免 所有字母数字及半角符号
                        if(/^[a-z0-9]$/i.test(prev)) show = false
                    }
 
                    if(/^\s/.test(chunk)) show = false //chunk以空白字符开头不匹配 避免`@ `也匹配
                    if(!show) {
                        this.closePanel()
                    } else {
                        const {
                            members,
                            filterMatch
                        } = this
                        if(!event) { // fixme: should be consistent with At.vue
                            this.$emit('at', chunk)
                        }
 
                        const matched = members.filter(v => {
                            return v.toString().indexOf(chunk) > -1
                        })
 
                        if(matched.length) {
                            this.openPanel(matched, chunk, index, at)
                        } else {
                            this.closePanel()
                        }
                    }
                } else {
                    this.closePanel()
                }
            },
 
            closePanel() {
                if(this.atwho) {
                    this.atwho = null
                }
            },
            openPanel(list, chunk, offset, at) { //打开Atuser列表  matched, chunk, index, at  过滤数组，匹配项，匹配项index，'@'
                const fn = () => {
                    const el = this.$el.querySelector('textarea')
                    const atEnd = offset + at.length // 从@后第一位开始
                    const rect = getCaretCoordinates(el, atEnd)
                    this.atwho = {
                        chunk,
                        offset,
                        list,
                        atEnd,
                        x: rect.left,
                        y: rect.top - 4,
                        cur: 0, // todo: 尽可能记录
                    }
                }
                if(this.atwho) {
                    fn()
                } else { // 焦点超出了显示区域 需要提供延时以移动指针 再计算位置
                    setTimeout(fn, 10)
                }
            },
 
            selectByMouse(e) {
                function closest(el, predicate) { //遍历直到有data-index为止
                    do {
                        if(predicate(el)) return el;
                    } while (el = el && el.parentNode);
                }
 
                const el = closest(e.target, d => {
                    return d.getAttribute('data-index')
                })
 
                const cur = +el.getAttribute('data-index')
                this.atwho = {
                    ...this.atwho,
                    cur
                }
            },
            selectByKeyboard(e) {
                const offset = e.keyCode === 38 ? -1 : 1
                const {
                    cur,
                    list
                } = this.atwho
                const nextCur = this.loop ?
                    (cur + offset + list.length) % list.length :
                    Math.max(0, Math.min(cur + offset, list.length - 1))
                this.atwho = {
                    ...this.atwho,
                    cur: nextCur
                }
            },
 
            // todo: 抽离成库并测试
            insertText(text, el) {
                const start = el.selectionStart
                const end = el.selectionEnd
                el.value = el.value.slice(0, start) +
                    text + el.value.slice(end)
                const newEnd = start + text.length
                el.selectionStart = newEnd
                el.selectionEnd = newEnd
            },
            insertItem() {
                const {
                    chunk,
                    offset,
                    list,
                    cur,
                    atEnd
                } = this.atwho
                const {
                    suffix,
                    atItems
                } = this
                const el = this.$el.querySelector('textarea')
                const text = el.value.slice(0, atEnd)
                const {
                    at,
                    index
                } = this.getAtAndIndex(text, atItems)
                const start = index + at.length // 从@后第一位开始
                el.selectionStart = start
                el.focus() // textarea必须focus回来
                const curItem = list[cur]
                const t = '' + curItem + suffix
                this.insertText(t, el)
                this.$emit('insert', curItem) //插入字符
                this.handleInput()
            }
        }
    }
</script>
 
<style lang="less" scoped="scoped">
    .atwho-wrap {
        width: 100%;
        font-size: 12px;
        color: #333;
        position: relative;
        .atwho-panel {
            position: absolute;
            &.test {
                width: 2px;
                height: 2px;
                background: red;
            }
            .atwho-inner {
                position: relative;
            }
        }
        .atwho-view {
            color: black;
            z-index: 11110 !important;
            border-radius: 2px;
            box-shadow: 0 0 10px 0 rgba(101, 111, 122, .5);
            position: absolute;
            cursor: pointer;
            background-color: rgba(255, 255, 255, .94);
            width: 170px;
            max-height: 312px;
            &::-webkit-scrollbar {
                width: 11px;
                height: 11px;
            }
            &::-webkit-scrollbar-track {
                background-color: #F5F5F5;
            }
            &::-webkit-scrollbar-thumb {
                min-height: 36px;
                border: 2px solid transparent;
                border-top: 3px solid transparent;
                border-bottom: 3px solid transparent;
                background-clip: padding-box;
                border-radius: 7px;
                background-color: #C4C4C4;
            }
        }
        .atwho-ul {
            list-style: none;
            padding: 0;
            margin: 0;
            li {
                box-sizing: border-box;
                display: block;
                height: 25px;
                padding: 2px 10px;
                white-space: nowrap;
                display: flex;
                align-items: center;
                justify-content: space-between;
                &.atwho-cur {
                    background: #f2f2f5;
                    color: #eb7350;
                }
                span {
                    overflow: hidden;
                    text-overflow: ellipsis;
                }
                img {
                    height: 13px;
                    width: 13px;
                }
            }
        }
    }
</style>

　　index.vue

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<template>
    <div class="atuser">
        <at :members="members" @enterSend="send" v-model="inputcontent">
            <textarea class="editor"></textarea>
        </at>
    </div>
</template>
 
<script>
    import at from './atuser.vue'
    export default {
        data() {
            return {
                members: [123, 12, 1234, 12345, "小花", "小花华", "小三"],
                inputcontent: "" //用户输入内容初始值
 
            };
        },
        components: {
            at,
        },
        methods: {
            send(e) { //回车发送
                console.log(e)
            }
        }
    }
</script>
 
<style scoped="scoped" lang="less">
    .atuser {
        width: 700px;
        height: 160px;
        border: 1px solid red;
        .editor{
            width: 700px;
            height: 160px;
            overflow: hidden;
            border: 0px;
            outline: none;
            resize: none;
           -webkit-appearance: none;
        }
    }
</style>

　　参考： https://www.cnblogs.com/ygunoil/p/13503648.html

posted on   ygunoil  阅读(1793)  评论(0)  编辑  收藏  举报
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