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src/components/select/select-head.vue 6.89 KB
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  <template>
      <div @click="onHeaderClick">
          <div class="ivu-tag ivu-tag-checked" v-for="item in selectedMultiple">
              <span class="ivu-tag-text">{{ item.label }}</span>
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              <Icon type="ios-close" @click.native.stop="removeTag(item)"></Icon>
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          </div>
          <span
              :class="singleDisplayClasses"
              v-show="singleDisplayValue"
          >{{ singleDisplayValue }}</span>
          <input
              :id="inputElementId"
              type="text"
              v-if="filterable"
              v-model="query"
              :disabled="disabled"
              :class="[prefixCls + '-input']"
              :placeholder="showPlaceholder ? localePlaceholder : ''"
              :style="inputStyle"
              autocomplete="off"
              spellcheck="false"
              @keydown="resetInputState"
              @keydown.delete="handleInputDelete"
              @focus="onInputFocus"
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              @blur="onInputBlur"
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              ref="input">
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          <Icon type="ios-close-circle" :class="[prefixCls + '-arrow']" v-if="resetSelect" @click.native.stop="onClear"></Icon>
          <Icon type="ios-arrow-down" :class="[prefixCls + '-arrow']" v-if="!resetSelect && !remote && !disabled"></Icon>
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      </div>
  </template>
  <script>
      import Icon from '../icon';
      import Emitter from '../../mixins/emitter';
      import Locale from '../../mixins/locale';
  
      const prefixCls = 'ivu-select';
  
      export default {
          name: 'iSelectHead',
          mixins: [ Emitter, Locale ],
          components: { Icon },
          props: {
              disabled: {
                  type: Boolean,
                  default: false
              },
              filterable: {
                  type: Boolean,
                  default: false
              },
              multiple: {
                  type: Boolean,
                  default: false
              },
              remote: {
                  type: Boolean,
                  default: false
              },
              initialLabel: {
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                  type: [String, Number, Array],
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              },
              values: {
                  type: Array,
                  default: () => []
              },
              clearable: {
                  type: [Function, Boolean],
                  default: false,
              },
              inputElementId: {
                  type: String
              },
              placeholder: {
                  type: String
              },
              queryProp: {
                  type: String,
                  default: ''
              }
          },
          data () {
              return {
                  prefixCls: prefixCls,
                  query: '',
                  inputLength: 20,
                  remoteInitialLabel: this.initialLabel,
                  preventRemoteCall: false,
              };
          },
          computed: {
              singleDisplayClasses(){
                  const {filterable, multiple, showPlaceholder} = this;
                  return [{
                      [prefixCls + '-placeholder']: showPlaceholder && !filterable,
                      [prefixCls + '-selected-value']: !showPlaceholder && !multiple && !filterable,
                  }];
              },
              singleDisplayValue(){
                  if ((this.multiple && this.values.length > 0) || this.filterable) return '';
                  return `${this.selectedSingle}` || this.localePlaceholder;
              },
              showPlaceholder () {
                  let status = false;
                  if (!this.multiple) {
                      const value = this.values[0];
                      if (typeof value === 'undefined' || String(value).trim() === ''){
                          status = !this.remoteInitialLabel;
                      }
                  } else {
                      if (!this.values.length > 0) {
                          status = true;
                      }
                  }
                  return status;
              },
              resetSelect(){
                  return !this.showPlaceholder && this.clearable;
              },
              inputStyle () {
                  let style = {};
  
                  if (this.multiple) {
                      if (this.showPlaceholder) {
                          style.width = '100%';
                      } else {
                          style.width = `${this.inputLength}px`;
                      }
                  }
  
                  return style;
              },
              localePlaceholder () {
                  if (this.placeholder === undefined) {
                      return this.t('i.select.placeholder');
                  } else {
                      return this.placeholder;
                  }
              },
              selectedSingle(){
                  const selected = this.values[0];
                  return selected ? selected.label : (this.remoteInitialLabel || '');
              },
              selectedMultiple(){
                  return this.multiple ? this.values : [];
              }
          },
          methods: {
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              onInputFocus(){
                  this.$emit('on-input-focus');
              },
              onInputBlur () {
                  if (!this.values.length) this.query = '';  // #5155
                  this.$emit('on-input-blur');
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              },
              removeTag (value) {
                  if (this.disabled) return false;
                  this.dispatch('iSelect', 'on-select-selected', value);
              },
              resetInputState () {
                  this.inputLength = this.$refs.input.value.length * 12 + 20;
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                  this.$emit('on-keydown');
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              },
              handleInputDelete () {
                  if (this.multiple && this.selectedMultiple.length && this.query === '') {
                      this.removeTag(this.selectedMultiple[this.selectedMultiple.length - 1]);
                  }
              },
              onHeaderClick(e){
                  if (this.filterable && e.target === this.$el){
                      this.$refs.input.focus();
                  }
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              },
              onClear(){
                  this.$emit('on-clear');
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              }
          },
          watch: {
              values ([value]) {
                  if (!this.filterable) return;
                  this.preventRemoteCall = true;
                  if (this.multiple){
                      this.query = '';
                      this.preventRemoteCall = false; // this should be after the query change setter above
                      return;
                  }
                  // #982
                  if (typeof value === 'undefined' || value === '' || value === null) this.query = '';
                  else this.query = value.label;
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                  this.$nextTick(() => this.preventRemoteCall = false); // this should be after the query change setter above
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              },
              query (val) {
                  if (this.preventRemoteCall) {
                      this.preventRemoteCall = false;
                      return;
                  }
  
                  this.$emit('on-query-change', val);
              },
              queryProp(query){
                  if (query !== this.query) this.query = query;
              },
          }
      };
  </script>