vue-context/docs-build/js/advanced-2.vue

<template>
    <div class="mt-5">
        <div class="flex flex-wrap">
            <div class="color-box"
                 :class="{ selected: hasColor(color.hex) }"
                 v-for="(color, index) in colors"
                 :key="index"
                 :style="{ 'background-color': color.hex }"
                 @contextmenu.prevent="$refs.menu.open($event, color)"
            >
                &nbsp;
            </div>
        </div>

        <h5 class="my-4">
            Selected colors:
        </h5>
        <code class="mb-3">{{ selectedColors }}</code>

        <vue-context ref="menu">
            <template slot-scope="child" v-if="child.data">
                <li>
                    <a href="#" @click.prevent="toggle(child.data)">
                        {{ hasColor(child.data.hex) ? 'Remove Color' : 'Select Color' }}
                    </a>
                </li>
            </template>
        </vue-context>
    </div>
</template>

<script>
    import VueContext from 'vue-context';
    import 'vue-context/src/sass/vue-context.scss';

    export default {
        components: { VueContext },

        data () {
            return {
                colors: [
                    { name: 'red', hex: '#f44336' },
                    { name: 'blue', hex: '#2196F3' },
                    { name: 'cyan', hex: '#00BCD4' },
                    { name: 'green', hex: '#4CAF50' },
                    { name: 'orange', hex: '#FF9800' }
                ],
                selectedColors: []
            };
        },

        methods: {
            colorIndex (hex) {
                return this.selectedColors.findIndex(color => color.hex === hex);
            },

            hasColor (hex) {
                return this.colorIndex(hex) > -1;
            },

            toggle (color) {
                const index = this.colorIndex(color.hex);

                if (index > -1) {
                    this.$delete(this.selectedColors, index);
                } else {
                    this.selectedColors.push(color);
                }
            }
        }
    };
</script>

<style lang="scss" scoped>
    .color-box {
        width: 100px;
        height: 100px;
        margin-right: 10px;
        border-radius: 4px;
        box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
        opacity: .6;

        &.selected {
            opacity: 1;
        }

        &:last-child {
            margin-right: 0;
        }
    }
</style>