提交处理

向提交处理传递额外数据

您可能需要多种提交行为，例如返回另一页或停留在表单上。您可以通过指定 onSubmitMeta 属性来完成此操作。这些元数据将被传递到 onSubmit 函数。

注意：如果 form.handleSubmit() 在没有元数据的情况下调用，它将使用提供的默认值。

angular-ts

import { Component } from '@angular/core';
import { injectForm } from '@tanstack/angular-form';


type FormMeta = {
  submitAction: 'continue' | 'backToMenu' | null;
};

// Metadata is not required to call form.handleSubmit().
// Specify what values to use as default if no meta is passed
const defaultMeta: FormMeta = {
  submitAction: null,
};

@Component({
  selector: 'app-root',
  template: `
    <form (submit)="handleSubmit($event)">
      <button type="submit" (click)="
        handleClick({ submitAction: 'continue' })
      ">Submit and continue</button>
      <button type="submit" (click)="
        handleClick({ submitAction: 'backToMenu' })
      ">Submit and back to menu</button>
    </form>
  `,
})
export class AppComponent {
  form = injectForm({
    defaultValues: {
      data: '',
    },
    // Define what meta values to expect on submission
    onSubmitMeta: defaultMeta,
    onSubmit: async ({ value, meta }) => {
      // Do something with the values passed via handleSubmit
      console.log(`Selected action - ${meta.submitAction}`, value);
    },
  });

  handleSubmit(event: SubmitEvent) {
    event.preventDefault();
    event.stopPropagation();
  }

  handleClick(meta: FormMeta) {
    // Overwrites the default specified in onSubmitMeta
    this.form.handleSubmit(meta);
  }
}

import { Component } from '@angular/core';
import { injectForm } from '@tanstack/angular-form';


type FormMeta = {
  submitAction: 'continue' | 'backToMenu' | null;
};

// Metadata is not required to call form.handleSubmit().
// Specify what values to use as default if no meta is passed
const defaultMeta: FormMeta = {
  submitAction: null,
};

@Component({
  selector: 'app-root',
  template: `
    <form (submit)="handleSubmit($event)">
      <button type="submit" (click)="
        handleClick({ submitAction: 'continue' })
      ">Submit and continue</button>
      <button type="submit" (click)="
        handleClick({ submitAction: 'backToMenu' })
      ">Submit and back to menu</button>
    </form>
  `,
})
export class AppComponent {
  form = injectForm({
    defaultValues: {
      data: '',
    },
    // Define what meta values to expect on submission
    onSubmitMeta: defaultMeta,
    onSubmit: async ({ value, meta }) => {
      // Do something with the values passed via handleSubmit
      console.log(`Selected action - ${meta.submitAction}`, value);
    },
  });

  handleSubmit(event: SubmitEvent) {
    event.preventDefault();
    event.stopPropagation();
  }

  handleClick(meta: FormMeta) {
    // Overwrites the default specified in onSubmitMeta
    this.form.handleSubmit(meta);
  }
}

使用标准模式转换数据

虽然 Tanstack Form 为验证提供了标准 Schema 支持，但它不会保留 Schema 的输出数据。

传递给 onSubmit 函数的值始终是输入数据。要接收标准 Schema 的输出数据，请在 onSubmit 函数中进行解析。

tsx

import { z } from 'zod'
// ...

const schema = z.object({
  age: z.string().transform((age) => Number(age)),
})

// Tanstack Form uses the input type of Standard Schemas
const defaultValues: z.input<typeof schema> = {
  age: '13',
}

// ...

@Component({
  // ...
})
export class AppComponent {
  form = injectForm({
    defaultValues,
    validators: {
      onChange: schema,
    },
    onSubmit: ({ value }) => {
      const inputAge: string = value.age
      // Pass it through the schema to get the transformed value
      const result = schema.parse(value)
      const outputAge: number = result.age
    },
  })
}

import { z } from 'zod'
// ...

const schema = z.object({
  age: z.string().transform((age) => Number(age)),
})

// Tanstack Form uses the input type of Standard Schemas
const defaultValues: z.input<typeof schema> = {
  age: '13',
}

// ...

@Component({
  // ...
})
export class AppComponent {
  form = injectForm({
    defaultValues,
    validators: {
      onChange: schema,
    },
    onSubmit: ({ value }) => {
      const inputAge: string = value.age
      // Pass it through the schema to get the transformed value
      const result = schema.parse(value)
      const outputAge: number = result.age
    },
  })
}

向提交处理传递额外数据

使用标准模式转换数据

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