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<cn>
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#### 自定义表单控件
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自定义或第三方的表单控件，也可以与 Form 组件一起使用。只要该组件遵循以下的约定：
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> - 提供受控属性 `value` 或其它与 [`valuePropName`](/components/form-cn/#getFieldDecorator(id,-options)-参数) 的值同名的属性。
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> - 提供 `onChange` 事件或 [`trigger`](/components/form-cn/#getFieldDecorator(id,-options)-参数) 的值同名的事件。
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> - 不能是函数式组件。
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</cn>
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<us>
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#### Customized Form Controls
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Customized or third-party form controls can be used in Form, too. Controls must follow these conventions:
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> - It has a controlled property `value` or other name which is equal to the value of [`valuePropName`](/components/form/#getFieldDecorator(id,-options)-parameters).
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> - It has event `onChange` or an event which name is equal to the value of [`trigger`](/components/form/#getFieldDecorator(id,-options)-parameters).
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> - It must be a class component.
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</us>
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<template>
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<a-form layout="inline" :form="form" @submit="handleSubmit">
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<a-form-item label="Price">
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<price-input
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v-decorator="[
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'price',
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{
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initialValue: { number: 0, currency: 'rmb' },
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rules: [{ validator: checkPrice }],
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},
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]"
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/>
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</a-form-item>
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<a-form-item>
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<a-button type="primary" html-type="submit">
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Submit
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</a-button>
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</a-form-item>
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</a-form>
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</template>
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<script>
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const PriceInput = {
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props: ['value'],
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template: `
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<span>
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<a-input
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type='text'
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:value="number"
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@change="handleNumberChange"
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style="width: 63%; margin-right: 2%;"
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/>
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<a-select
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:value="currency"
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style="width: 32%"
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@change="handleCurrencyChange"
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>
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<a-select-option value='rmb'>RMB</a-select-option>
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<a-select-option value='dollar'>Dollar</a-select-option>
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</a-select>
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</span>
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`,
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data() {
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const value = this.value || {};
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return {
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number: value.number || 0,
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currency: value.currency || 'rmb',
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};
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},
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watch: {
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value(val = {}) {
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this.number = val.number || 0;
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this.currency = val.currency || 'rmb';
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},
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},
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methods: {
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handleNumberChange(e) {
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const number = parseInt(e.target.value || 0, 10);
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if (isNaN(number)) {
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return;
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}
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this.triggerChange({ number });
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},
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handleCurrencyChange(currency) {
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this.triggerChange({ currency });
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},
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triggerChange(changedValue) {
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// Should provide an event to pass value to Form.
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this.$emit('change', Object.assign({}, this.$data, changedValue));
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},
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},
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};
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export default {
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components: {
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PriceInput,
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},
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beforeCreate() {
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this.form = this.$form.createForm(this, { name: 'customized_form_controls' });
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},
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methods: {
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handleSubmit(e) {
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e.preventDefault();
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this.form.validateFields((err, values) => {
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if (!err) {
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console.log('Received values of form: ', values);
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}
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});
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},
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checkPrice(rule, value, callback) {
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if (value.number > 0) {
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callback();
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return;
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}
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callback('Price must greater than zero!');
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},
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},
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};
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</script>
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