element/packages/message/src/main.vue

<template>
  <transition name="el-message-fade">
    <div
      class="el-message"
      :class="customClass"
      v-show="visible"
      @mouseenter="clearTimer"
      @mouseleave="startTimer">
      <div :class="iconWrapClass">
        <i :class="iconClass" v-if="iconClass"></i>
        <i :class="typeClass" v-else></i>
      </div>
      <div class="el-message__group">
        <slot>
          <p v-if="!dangerouslyUseHTMLString">{{ message }}</p>
          <p v-else v-html="message"></p>
        </slot>
        <div v-if="showClose" class="el-message__closeBtn el-icon-close" @click="close"></div>
      </div>
    </div>
  </transition>
</template>

<script type="text/babel">
  const typeMap = {
    success: 'circle-check',
    info: 'information',
    warning: 'warning',
    error: 'circle-cross'
  };

  export default {
    data() {
      return {
        visible: false,
        message: '',
        duration: 3000,
        type: 'info',
        iconClass: '',
        customClass: '',
        onClose: null,
        showClose: false,
        closed: false,
        timer: null,
        dangerouslyUseHTMLString: false
      };
    },

    computed: {
      iconWrapClass() {
        const classes = ['el-message__icon'];
        if (this.type && !this.iconClass) {
          classes.push(`el-message__icon--${ this.type }`);
        }
        return classes;
      },

      typeClass() {
        return this.type && !this.iconClass
          ? `el-message__type el-icon-${ typeMap[this.type] }-plain`
          : '';
      }
    },

    watch: {
      closed(newVal) {
        if (newVal) {
          this.visible = false;
          this.$el.addEventListener('transitionend', this.destroyElement);
        }
      }
    },

    methods: {
      destroyElement() {
        this.$el.removeEventListener('transitionend', this.destroyElement);
        this.$destroy(true);
        this.$el.parentNode.removeChild(this.$el);
      },

      close() {
        this.closed = true;
        if (typeof this.onClose === 'function') {
          this.onClose(this);
        }
      },

      clearTimer() {
        clearTimeout(this.timer);
      },

      startTimer() {
        if (this.duration > 0) {
          this.timer = setTimeout(() => {
            if (!this.closed) {
              this.close();
            }
          }, this.duration);
        }
      }
    },

    mounted() {
      this.startTimer();
    }
  };
</script>