answer-mini/wechat-app/static/vant/field/index.js

import { VantComponent } from '../common/component';
import { commonProps, inputProps, textareaProps } from './props';
VantComponent({
  field: true,
  classes: ['input-class', 'right-icon-class', 'label-class'],
  props: Object.assign(
    Object.assign(
      Object.assign(Object.assign({}, commonProps), inputProps),
      textareaProps
    ),
    {
      size: String,
      icon: String,
      label: String,
      error: Boolean,
      center: Boolean,
      isLink: Boolean,
      leftIcon: String,
      rightIcon: String,
      autosize: [Boolean, Object],
      required: Boolean,
      iconClass: String,
      clickable: Boolean,
      inputAlign: String,
      customStyle: String,
      errorMessage: String,
      arrowDirection: String,
      showWordLimit: Boolean,
      errorMessageAlign: String,
      readonly: {
        type: Boolean,
        observer: 'setShowClear',
      },
      clearable: {
        type: Boolean,
        observer: 'setShowClear',
      },
      border: {
        type: Boolean,
        value: true,
      },
      titleWidth: {
        type: String,
        value: '6.2em',
      },
    }
  ),
  data: {
    focused: false,
    innerValue: '',
    showClear: false,
  },
  created() {
    this.value = this.data.value;
    this.setData({ innerValue: this.value });
  },
  methods: {
    onInput(event) {
      const { value = '' } = event.detail || {};
      this.value = value;
      this.setShowClear();
      this.emitChange();
    },
    onFocus(event) {
      this.focused = true;
      this.setShowClear();
      this.$emit('focus', event.detail);
    },
    onBlur(event) {
      this.focused = false;
      this.setShowClear();
      this.$emit('blur', event.detail);
    },
    onClickIcon() {
      this.$emit('click-icon');
    },
    onClear() {
      this.setData({ innerValue: '' });
      this.value = '';
      this.setShowClear();
      wx.nextTick(() => {
        this.emitChange();
        this.$emit('clear', '');
      });
    },
    onConfirm(event) {
      const { value = '' } = event.detail || {};
      this.value = value;
      this.setShowClear();
      this.$emit('confirm', value);
    },
    setValue(value) {
      this.value = value;
      this.setShowClear();
      if (value === '') {
        this.setData({ innerValue: '' });
      }
      this.emitChange();
    },
    onLineChange(event) {
      this.$emit('linechange', event.detail);
    },
    onKeyboardHeightChange(event) {
      this.$emit('keyboardheightchange', event.detail);
    },
    emitChange() {
      this.setData({ value: this.value });
      wx.nextTick(() => {
        this.$emit('input', this.value);
        this.$emit('change', this.value);
      });
    },
    setShowClear() {
      const { clearable, readonly } = this.data;
      const { focused, value } = this;
      this.setData({
        showClear: !!clearable && !!focused && !!value && !readonly,
      });
    },
    noop() {},
  },
});