element-ui上传图片后标注坐标点的示例分析

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什么是element-ui

    element-ui是由饿了么前端团队推出的一套为开发者、设计师和产品经理准备的基于vue.js 2.0的桌面组件库，而手机端有对应框架是 Mint UI 。整个ui风格简约，很实用，同时也极大的提高了开发者的效率，是一个非常受欢迎的组件库。

页面大概如下：

组件使用的是layui的layer.open弹框。

左边是表单信息，右边是绘图区域。

原文件mapFORM.Vue

<template>    <div class="mapForm">        <div class="left">            <el-form ref="form" :model="form" :rules="rules" label-width="160px">                <el-form-item label="地图名称" prop="mapName">                    <el-input v-model="form.mapName" size="mini" clearable class="formInputClass"></el-input>                </el-form-item>                <el-form-item label="地图描述" prop="remarks">                    <el-input type="textarea" v-model="form.remarks" size="mini" clearable class="formInputClass"></el-input>                </el-form-item>                <el-form-item label="点位信息" prop="" v-if="mapList.length > 0">                    <div class="mapContent">                        <div v-for="(map,key) in mapList" :key="key">                            <div class="pointAbscissaOrdinate"><span>点位坐标{{key+1}}：{{map.abscissa}}-{{map.ordinate}}</span></div>                            <el-select v-model="mapList[key]['point']" placeholder="请选择" class="selectClass" @change="changePoint">                                <el-option v-for="(item, key) in pointList" :key="key" :label="item.name" :value="item.point">                                </el-option>                            </el-select>                        </div>                    </div>                </el-form-item>                <div class="btn">                    <el-button @click="checkParams" type="primary">提交</el-button>                </div>            </el-form>        </div>        <div class="right" id="">            <div class="imgDiv" id="imgDiv" v-loading="loadStage">                <img :src="fileSrc" width="1100" height="720" id="imgPainter" />                <div class="marker" v-for="(item, key) in mapList" :key="key" : @contextmenu.prevent="clearMarker(key)">                    {{key+1}}                    <div class="ponint">{{item.point}}</div>                </div>            </div>            <div class="uploadBtn">                <el-upload class="upload-demo" ref="upload" action="" :on-change="handleChange" :show-file-list="false" :on-remove="handleRemove" :auto-upload="false" >                    <el-button slot="trigger" size="mini" type="primary">选取文件</el-button>                </el-upload>                <el-button @click="clearPic" type="danger">清除所有点位</el-button>            </div>            <div class="info"><i class="el-icon-info"></i>显示大小为1100px*720px</div>            <div class="info"><i class="el-icon-info"></i>图片框内鼠标左键标点</div>            <div class="info"><i class="el-icon-info"></i>图片框内鼠标右键已经标注的点删除该点</div>        </div>    </div></template><script>export default {    name: 'mapFormComponent',    data() {        return {            form: {                mapName: "",            },            rules: {                mapName: [                    { required: true, message: "请输入地图名称", trigger: "blur" },                ],            },            fileList: [],            fileSrc: '',            pointList: [                { name: "排放口1", point: "@FQ01" },                { name: "排放口2", point: "@FQ02" },            ],            mapList: [],           //斑马线的数组            canBiaoZhu: true,  //是否可以进行标注            pointColor: 'red',   //点的颜色            pointSize: 20,       //点的大小            pointSelectList: {},            notifyId: {},            loadStage: false,        };    },    created() { },    mounted() {        // 绘点区域事件绑定        let _this = this;        if (document.getElementById('imgPainter')) {            document.getElementById('imgPainter').onmousedown = (e) => {                e = e || window.event                if (e.button !== 2) {       //判断是否右击                    if (this.canBiaoZhu && this.fileSrc != '') {    //判断是否可以进行标注  需上传图片                        var x = e.offsetX || e.layerX                        var y = e.offsetY || e.layerY                        this.mapList.push({                            id: this.mapList.length + 1,                            name: '',                            abscissa: x,                            ordinate: y,                        })                        // 设置变量                        // this.pointSelectList.$set(0);                        let key = `point`;                        _this.$set(this.mapList[this.mapList.length - 1], key, "")                    } else {                        //提示上传图片                        // 只显示一次                        if (_this.notifyId.id)                            _this.notifyId.close();                        this.notifyId = _this.$notify.error({                            title: '提示信息',                            message: '请先上传图片后再标点',                            showClose: true,                        });                    }                } else {                    return false                }            }        }        // 右键阻止        var oDiv1 = document.getElementById('imgDiv');        oDiv1.oncontextmenu = function (ev) {            var e = e || window.event;            //阻止冒泡            e.cancelBubble = true;            //阻止触发默认事件            e.returnValue = false;        }    },    methods: {        changePoint() {                        this.$forceUpdate();        },        clearMarker(index) {                        this.mapList.splice(index, 1);        },        handleChange(file, fileList) {            this.loadStage = true;            let fileName = file.name;            let regex = /(.jpg|.jpeg|.gif|.png|.bmp)$/;            if (regex.test(fileName.toLowerCase())) {                this.fileSrc = URL.createObjectURL(file.raw)  // 获取URL                console.log(this.fileSrc);            } else {                this.$message.error('请选择图片文件');            }            this.loadStage = false;        },        clearPic() {                        this.mapList = [];        },        checkParams() {                        this.$refs["form"].validate((valid) => {                if (valid) {                    let params = this.form;                    this.submit(params);                }            });        },        async submit(params) {                        let resp = await this.$api.companyApiList                .addEditCompany(params);            if (resp.data.code != "error") {                // 判断是否新增修改                this.$notify.success({                    title: "提示",                    message: resp.data.msg,                    showClose: true,                });                let type = params.id && params.id != '' ? 'edit' : 'add';                this.$emit("update", type);                // 清空表单数据                this.$refs.form.resetFields();            }        },    },};</script><style scoped lang="less">.mapForm {    display: flex;    padding: 10px;    border: 1px solid pink;    .left {        flex: 2;        border-right: 1px dashed pink;        margin-right: 4px;        .mapContent {            height: 700px;            overflow-y: auto;            .selectClass {                margin: 0px 5px;            }            .pointAbscissaOrdinate {                display: inline-block;                width: 140px;            }        }    }    .right {        flex: 8;        // border: 1px solid pink;        max-width: 1100px;        .imgDiv {            position: relative;            height: 720px;            border: 2px solid cornflowerblue;            .marker {                position: absolute;                border-radius: 50%;                z-index: 999;                width: 20px;                height: 20px;                background-color: red;                text-align: center;                line-height: 20px;                color: yellow;                .ponint {                    display: block;                    position: absolute;                    left: 20px;                    top: 0px;                    font-size: 12px;                    color: blue;                }            }            .marker:hover .ponint {                display: block;            }        }        .info {            font-size: 12px;        }        .uploadBtn {            margin: 10px 0px;        }    }    .btn {        padding-left: 160px;    }}.formInputClass {    width: 200px;}</style>

标点的效果如下：

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