element-ui 上传图片后标注坐标点

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\" :style=\"{top: item.ordinate+\'px\', \'left\': item.abscissa+\'px\'}\" @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\" style=\"display:inline-block;\">
                    <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.$notify.error({
                            title: \'提示信息\',
                            message: \'请先上传图片后再标点\',
                            showClose: true,
                        });
                    }
                } else {
                    return false
                }
            }
        }
        // 右键阻止
        var oDiv1 = document.getElementById(\'imgDiv\');
        oDiv1.oncontextmenu = function (ev) {
            var e = e || window.event;
            //阻止冒泡
            e.cancelBubble = true;
            //阻止触发默认事件
            e.returnValue = false;
        }
    },
    methods: {
        changePoint() {
            /**point change */
            this.$forceUpdate();
        },
        clearMarker(index) {
            /**清除marker */
            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() {
            /**清除图片 */
            this.mapList = [];
        },
        checkParams() {
            /***
             * 验证提交信息
             */
            this.$refs[\"form\"].validate((valid) => {
                if (valid) {
                    let params = this.form;
                    this.submit(params);
                }
            });
        },
        async submit(params) {
            /**提交 */
            let resp = await this.$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\">
/**
  表单样式
 */
.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：