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src/views/components/transfer/transfer-panel.vue

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+<template>
+  <div class="el-transfer-panel">
+    <p class="el-transfer-panel__header">
+      <el-checkbox
+        v-model="allChecked"
+        @change="handleAllCheckedChange"
+        :indeterminate="isIndeterminate">
+        {{ title }}
+        <span>{{ checkedSummary }}</span>
+      </el-checkbox>
+    </p>
+    
+    <div :class="['el-transfer-panel__body', hasFooter ? 'is-with-footer' : '']">
+      <el-input
+        class="el-transfer-panel__filter"
+        v-model="query"
+        size="small"
+        :placeholder="placeholder"
+        @mouseenter.native="inputHover = true"
+        @mouseleave.native="inputHover = false"
+        v-if="filterable">
+        <i slot="prefix"
+          :class="['el-input__icon', 'el-icon-' + inputIcon]"
+          @click="clearQuery"
+        ></i>
+      </el-input>
+      <el-checkbox-group
+        v-model="checked"
+        v-show="!hasNoMatch && data.length > 0"
+        :class="{ 'is-filterable': filterable }"
+        class="el-transfer-panel__list">
+        <el-checkbox
+          class="el-transfer-panel__item"
+          :label="item[keyProp]"
+          :disabled="item[disabledProp]"
+          :key="item[keyProp]"
+          v-for="item in filteredData">
+          <option-content :option="item"></option-content>
+        </el-checkbox>
+      </el-checkbox-group>
+      <p
+        class="el-transfer-panel__empty"
+        v-show="hasNoMatch">{{ t('el.transfer.noMatch') }}</p>
+      <p
+        class="el-transfer-panel__empty"
+        v-show="data.length === 0 && !hasNoMatch">{{ t('el.transfer.noData') }}</p>
+    </div>
+    <p class="el-transfer-panel__footer" v-if="hasFooter">
+      <slot></slot>
+    </p>
+  </div>
+</template>
+
+<script>
+  import ElCheckboxGroup from 'element-ui/packages/checkbox-group';
+  import ElCheckbox from 'element-ui/packages/checkbox';
+  import ElInput from 'element-ui/packages/input';
+  import Locale from 'element-ui/src/mixins/locale';
+
+  export default {
+    mixins: [Locale],
+
+    name: 'ElTransferPanel',
+
+    componentName: 'ElTransferPanel',
+
+    components: {
+      ElCheckboxGroup,
+      ElCheckbox,
+      ElInput,
+      OptionContent: {
+        props: {
+          option: Object
+        },
+        render(h) {
+          const getParent = vm => {
+            if (vm.$options.componentName === 'ElTransferPanel') {
+              return vm;
+            } else if (vm.$parent) {
+              return getParent(vm.$parent);
+            } else {
+              return vm;
+            }
+          };
+          const panel = getParent(this);
+          const transfer = panel.$parent || panel;
+          return panel.renderContent
+            ? panel.renderContent(h, this.option)
+            : transfer.$scopedSlots.default
+              ? transfer.$scopedSlots.default({ option: this.option })
+              : <span>{ this.option[panel.labelProp] || this.option[panel.keyProp] }</span>;
+        }
+      }
+    },
+
+    props: {
+      data: {
+        type: Array,
+        default() {
+          return [];
+        }
+      },
+      renderContent: Function,
+      placeholder: String,
+      title: String,
+      filterable: Boolean,
+      format: Object,
+      filterMethod: Function,
+      defaultChecked: Array,
+      props: Object
+    },
+
+    data() {
+      return {
+        checked: [],
+        allChecked: false,
+        query: '',
+        inputHover: false,
+        checkChangeByUser: true
+      };
+    },
+
+    watch: {
+      checked(val, oldVal) {
+        this.updateAllChecked();
+        if (this.checkChangeByUser) {
+          const movedKeys = val.concat(oldVal)
+            .filter(v => val.indexOf(v) === -1 || oldVal.indexOf(v) === -1);
+          this.$emit('checked-change', val, movedKeys);
+        } else {
+          this.$emit('checked-change', val);
+          this.checkChangeByUser = true;
+        }
+      },
+
+      data() {
+        const checked = [];
+        const filteredDataKeys = this.filteredData.map(item => item[this.keyProp]);
+        this.checked.forEach(item => {
+          if (filteredDataKeys.indexOf(item) > -1) {
+            checked.push(item);
+          }
+        });
+        this.checkChangeByUser = false;
+        this.checked = checked;
+      },
+
+      checkableData() {
+        this.updateAllChecked();
+      },
+
+      defaultChecked: {
+        immediate: true,
+        handler(val, oldVal) {
+          if (oldVal && val.length === oldVal.length &&
+            val.every(item => oldVal.indexOf(item) > -1)) return;
+          const checked = [];
+          const checkableDataKeys = this.checkableData.map(item => item[this.keyProp]);
+          val.forEach(item => {
+            if (checkableDataKeys.indexOf(item) > -1) {
+              checked.push(item);
+            }
+          });
+          this.checkChangeByUser = false;
+          this.checked = checked;
+        }
+      }
+    },
+
+    computed: {
+      filteredData() {
+        return this.data.filter(item => {
+          if (typeof this.filterMethod === 'function') {
+            return this.filterMethod(this.query, item);
+          } else {
+            const label = item[this.labelProp] || item[this.keyProp].toString();
+            return label.toLowerCase().indexOf(this.query.toLowerCase()) > -1;
+          }
+        });
+      },
+
+      checkableData() {
+        return this.filteredData.filter(item => !item[this.disabledProp]);
+      },
+
+      checkedSummary() {
+        const checkedLength = this.checked.length;
+        const dataLength = this.data.length;
+        const { noChecked, hasChecked } = this.format;
+        if (noChecked && hasChecked) {
+          return checkedLength > 0
+            ? hasChecked.replace(/\${checked}/g, checkedLength).replace(/\${total}/g, dataLength)
+            : noChecked.replace(/\${total}/g, dataLength);
+        } else {
+          return `${ checkedLength }/${ dataLength }`;
+        }
+      },
+
+      isIndeterminate() {
+        const checkedLength = this.checked.length;
+        return checkedLength > 0 && checkedLength < this.checkableData.length;
+      },
+
+      hasNoMatch() {
+        return this.query.length > 0 && this.filteredData.length === 0;
+      },
+
+      inputIcon() {
+        return this.query.length > 0 && this.inputHover
+          ? 'circle-close'
+          : 'search';
+      },
+
+      labelProp() {
+        return this.props.label || 'label';
+      },
+
+      keyProp() {
+        return this.props.key || 'key';
+      },
+
+      disabledProp() {
+        return this.props.disabled || 'disabled';
+      },
+
+      hasFooter() {
+        return !!this.$slots.default;
+      }
+    },
+
+    methods: {
+      updateAllChecked() {
+        const checkableDataKeys = this.checkableData.map(item => item[this.keyProp]);
+        this.allChecked = checkableDataKeys.length > 0 &&
+          checkableDataKeys.every(item => this.checked.indexOf(item) > -1);
+      },
+
+      handleAllCheckedChange(value) {
+        this.checked = value
+          ? this.checkableData.map(item => item[this.keyProp])
+          : [];
+      },
+
+      clearQuery() {
+        if (this.inputIcon === 'circle-close') {
+          this.query = '';
+        }
+      }
+    }
+  };
+</script>