[improvement] Stepper: jsx (#2624)

packages/stepper/index.js

@@ -0,0 +1,147 @@
+import { use, isDef } from '../utils';
+
+const [sfc, bem] = use('stepper');
+
+export default sfc({
+  props: {
+    value: null,
+    integer: Boolean,
+    disabled: Boolean,
+    asyncChange: Boolean,
+    disableInput: Boolean,
+    min: {
+      type: [String, Number],
+      default: 1
+    },
+    max: {
+      type: [String, Number],
+      default: Infinity
+    },
+    step: {
+      type: [String, Number],
+      default: 1
+    },
+    defaultValue: {
+      type: [String, Number],
+      default: 1
+    }
+  },
+
+  data() {
+    const value = this.range(isDef(this.value) ? this.value : this.defaultValue);
+    if (value !== +this.value) {
+      this.$emit('input', value);
+    }
+
+    return {
+      currentValue: value
+    };
+  },
+
+  computed: {
+    minusDisabled() {
+      return this.disabled || this.currentValue <= this.min;
+    },
+
+    plusDisabled() {
+      return this.disabled || this.currentValue >= this.max;
+    }
+  },
+
+  watch: {
+    value(val) {
+      if (val !== this.currentValue) {
+        this.currentValue = this.format(val);
+      }
+    },
+
+    currentValue(val) {
+      this.$emit('input', val);
+      this.$emit('change', val);
+    }
+  },
+
+  methods: {
+    // filter illegal characters
+    format(value) {
+      value = String(value).replace(/[^0-9.-]/g, '');
+      return value === '' ? 0 : this.integer ? Math.floor(value) : +value;
+    },
+
+    // limit value range
+    range(value) {
+      return Math.max(Math.min(this.max, this.format(value)), this.min);
+    },
+
+    onInput(event) {
+      const { value } = event.target;
+      const formatted = this.format(value);
+
+      if (!this.asyncChange) {
+        if (+value !== formatted) {
+          event.target.value = formatted;
+        }
+        this.currentValue = formatted;
+      } else {
+        event.target.value = this.currentValue;
+        this.$emit('input', formatted);
+        this.$emit('change', formatted);
+      }
+    },
+
+    onChange(type) {
+      if (this[`${type}Disabled`]) {
+        this.$emit('overlimit', type);
+        return;
+      }
+
+      const diff = type === 'minus' ? -this.step : +this.step;
+      const value = Math.round((this.currentValue + diff) * 100) / 100;
+
+      if (!this.asyncChange) {
+        this.currentValue = this.range(value);
+      } else {
+        this.$emit('input', value);
+        this.$emit('change', value);
+      }
+      this.$emit(type);
+    },
+
+    onBlur(event) {
+      this.currentValue = this.range(this.currentValue);
+      this.$emit('blur', event);
+
+      // fix edge case when input is empty and min is 0
+      if (this.currentValue === 0) {
+        event.target.value = this.currentValue;
+      }
+    }
+  },
+
+  render(h) {
+    const onChange = type => () => {
+      this.onChange(type);
+    };
+
+    return (
+      <div class={bem()}>
+        <button
+          class={bem('minus', { disabled: this.minusDisabled })}
+          onClick={onChange('minus')}
+        />
+        <input
+          type="number"
+          class={bem('input')}
+          value={this.currentValue}
+          disabled={this.disabled || this.disableInput}
+          onInput={this.onInput}
+          onBlur={this.onBlur}
+        />
+        <button
+          class={bem('plus', { disabled: this.plusDisabled })}
+          onClick={onChange('plus')}
+        />
+      </div>
+    );
+  }
+});