src/controls/ControlIcon.vue

<template>
<div class="control-icon">
    <el-select size="mini" v-model="innerValue" @change="onValueChange">
        <el-option v-for="item in optionsArr"
            :key="item"
            :value="item"
        >{{item}}</el-option>
    </el-select>
    <el-button size="mini" type="primary" @click="chooseFile">{{$t('example.upload')}}</el-button>
</div>
</template>

<script>

import {flatten} from '../dep/flatten';

export function parseXML(svgStr) {
    const parser = new DOMParser();
    const svg = parser.parseFromString(svgStr, 'text/xml');
    let svgNode = svg;
    // Document node. If using $.get, doc node may be input.
    if (svgNode.nodeType === 9) {
        svgNode = svgNode.firstChild;
    }
    // nodeName of <!DOCTYPE svg> is also 'svg'.
    while (svgNode.nodeName.toLowerCase() !== 'svg' || svgNode.nodeType !== 1) {
        svgNode = svgNode.nextSibling;
    }

    return svgNode;
}

export default {

    props: ['value'],

    computed: {
        optionsArr() {
            return ['circle', 'rect', 'roundRect', 'triangle', 'diamond', 'pin', 'arrow', 'none']
        },
    },

    data() {
        return {
            innerValue: this.value
        }
    },

    watch: {
        value(val) {
            this.innerValue = val;
        }
    },

    methods: {
        onValueChange() {
            this.$emit('change', this.innerValue);
        },
        chooseFile() {
            const input  = document.createElement('input');
            input.type = 'file';
            input.accept= '.jpg, .jpeg, .png, .svg'
            input.addEventListener('change',  (e) => {
                const file = e.target.files[0];
                if (!file) {
                    return;
                }
                if (file.name.endsWith('.svg')) {
                    // read path
                    // Use image
                    const fileReader = new FileReader();
                    fileReader.addEventListener('load', () => {
                        const svgStr = fileReader.result;
                        const svg = parseXML(svgStr);
                        try {
                            flatten(svg);
                        }
                        catch (e) {
                            console.error('Unexpected error happens when handling the SVG.');
                            console.error(e.toString());
                        }

                        const paths = svg.querySelectorAll('path');
                        let defs = [];
                        for (let i = 0; i < paths.length; i++) {
                            defs.push(paths[i].getAttribute('d'));
                        }
                        this.$emit('change', 'path://' + defs.join(' '));
                    });
                    fileReader.readAsText(file);
                }
                else {
                    // Use image
                    const fileReader = new FileReader();
                    fileReader.addEventListener('load', () => {
                        this.$emit('change', 'image://' + fileReader.result);
                    });
                    fileReader.readAsDataURL(file);
                }
            });
            input.click();
        }
    }
}
</script>

<style lang="scss">
</style>