动态表单库

https://github.com/ngx-formly/ngx-formly

ng add @ngx-formly/schematics --ui-theme=ng-zorro-antd

@ngx-formly/ng-zorro-antd

• • • bootstrap
    • material
    • ng-zorro-antd
    • ionic
    • primeng
    • kendo
    • nativescript

会默认导入到Module

+ import { ReactiveFormsModule } from '@angular/forms';
+ import { FormlyModule } from '@ngx-formly/core';
+ import { FormlyBootstrapModule } from '@ngx-formly/bootstrap';

@NgModule({
  imports: [
    BrowserModule,
+   FormsModule,  
+   ReactiveFormsModule,
      
   // -----------
    FormlyNgZorroAntdModule,
    NzFormModule,
   //    -------  
      
+   FormlyModule.forRoot(),
+   FormlyBootstrapModule
  ],
  ...
})

formly-form

  <formly-form [form]="form" [fields]="fields" [model]="model"></formly-form>

该<formly-form>组件是表单的主要容器

• fields：用于构建表单的字段配置。
• form：允许跟踪模型值和验证状态的表单实例。
• model：表格要表示的模型

  form = new FormGroup({});
  model = { email: '[email protected]' };
  fields: FormlyFieldConfig[] = [
    {
      key: 'email',
      type: 'input',
      props: {
        label: 'Email address',
        placeholder: 'Enter email',
        required: true,
      }
    }
  ];

(modelChange) model 值发生变量的时候触发的事件

fields

 modelOptions?: {
    debounce?: { // 防抖的ms 值
      default: number;
    };
    //  https://angular.io/api/forms/AbstractControl#updateOn 触发方式
    updateOn?: 'change' | 'blur' | 'submit';
  };

formState 配合option 进行状态通信

NgModule 声明中声明验证函数和消息

自定义校验

// 自定义报错信息
export function IpValidatorMessage(error: any, field: FormlyFieldConfig) {
  return `"${field.formControl.value}" is not a valid IP Address`;
}
// 报错规则
export function IpValidator(control: AbstractControl): ValidationErrors | null {
  return /(\d{1,3}\.){3}\d{1,3}/.test(control.value) ? null : { 'ipTwo': true };
}
...
@NgModule({
  imports: [
    ...
    FormlyModule.forRoot({
      validationMessages: [
        { name: 'ipTwo', message: IpValidatorMessage },
        { name: 'required', message: 'This field is required' },
      ],
       validators: [
        { name: 'ipTwo', validation: IpValidator },
      ],
    }),
  ]
})

页面上使用

{
  key: 'ip',
  type: 'input',
  props: {
    label: 'IP Address (using custom validation declared in ngModule)',
    required: true,
  },
  validators: {
    validation: ['ipTwo'],
  },
  // 异步校验器
  asyncValidators: {
    validation: ['ipAsync'],
  },    
},

字段声明校验函数

export function IpValidator(control: AbstractControl): ValidationErrors {
  return /(\d{1,3}\.){3}\d{1,3}/.test(control.value) ? null : { 'ipTwo': true };
}

{
  key: 'ip',
  type: 'input',
  props: {
    label: 'IP Address (using custom validation through `validators.validation` property)',
    required: true,
  },
  validators: {
    validation: [IpValidator],
  },
  // 异步函数
   asyncValidators: {
    validation: [IpAsyncValidator],
  },     
},

在字段定义中声明验证函数和消息

{
  key: 'ip',
  type: 'input',
  props: {
    label: 'IP Address (using custom validation through `validators.expression` property)',
    description: 'custom validation message through `validators.expression` property',
    required: true,
  },
  validators: {
    ip: {
        // 为true 为符合报错信息
      expression: (c: AbstractControl) => /(\d{1,3}\.){3}\d{1,3}/.test(c.value),
      message: (error: any, field: FormlyFieldConfig) => `"${field.formControl.value}" is not a valid IP Address`,
    },
  },
  asyncValidators: {
    ip: {
      expression: (c: AbstractControl) => return new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve(/(\d{1,3}\.){3}\d{1,3}/.test(c.value));
        }, 1000);
      }),
      message: (error: any, field: FormlyFieldConfig) => `"${field.formControl.value}" is not a valid IP Address`,
    },
  },
},

在 NgModule 声明中的表单类型和消息中声明验证函数

export function IpValidator(control: AbstractControl): boolean {
  return /(\d{1,3}\.){3}\d{1,3}/.test(control.value);
}

@NgModule({
  imports: [
    ...
    FormlyModule.forRoot({
      validationMessages: [
        { name: 'ipTwo', message: 'This field is required' },
      ],
      types: [
        {
          name: 'ipTwo',
          extends: 'input',
          defaultOptions: {
            validators: {
              ip: IpValidator // 'ip' matches the ip validation message
            }
          },
        },
    }),
  ]
})

形式表达式expression

{
  key: 'text2',
  type: 'input',
  props: {
    label: 'Hey!',
    placeholder: 'This one is disabled if there is no text in the other input',
  },
  expressions: {
    'props.disabled': '!model.text',
    'props.disabled': (field: FormlyFieldConfig) => {
      return !field.model.text;
    },
  },
},

{
  key: 'iLikeTwix',
  type: 'checkbox',
  props: {
    label: 'I like twix',
  },
  expressions: { 
      hide: '!model.name',
      hide: (field: FormlyFieldConfig) => {
      return field.model?.city === "123";
    },
  },
}

toggle(){
  this.fields[0].hide = !this.fields[0].hide;
}

formState 状态

 <formly-form [model]="model" [fields]="fields" [options]="options" [form]="form"></formly-form>

  form = new FormGroup({});
  model: any = {};
  options: FormlyFormOptions = {
    formState: {
      disabled: true,
    },
  };

  fields: FormlyFieldConfig[] = [
    {
      key: 'text',
      type: 'input',
      props: {
        label: 'First Name',
      },
      expressions: {
        // apply expressionProperty for disabled based on formState
        'props.disabled': 'formState.disabled',
      },
    },
  ];

  toggleDisabled() {
    this.options.formState.disabled = !this.options.formState.disabled;
  }

   hooks: {
        afterContentInit: () => {},
        afterViewInit: () => {},
        onInit: () => {},
        onChanges: () => {},
        onDestroy: () => {},
      },

export type FormlyHookFn = (field: FormlyFieldConfig) => void;

export interface FormlyHookConfig {
  onInit?: FormlyHookFn;
  onChanges?: FormlyHookFn;
  afterContentInit?: FormlyHookFn;
  afterViewInit?: FormlyHookFn;
  onDestroy?: FormlyHookFn;
}

hooks:{
           onInit(f: FormlyFieldConfigCache) {
                    f.formControl = new FormControl();
                }
            },
}

fieldChanges

值得监听(源码是对valueChanges进行封装)

            hooks: {
                onInit(f: FormlyFieldConfigCache) {
                    f?.options?.fieldChanges?.subscribe(res => {
                        console.log(res,'ressss');
                    })
                }
            },
            modelOptions: {
                debounce: {default: 3000},// 防抖
                updateOn: 'change'
            }

自定义组件

import { Component } from '@angular/core';
import { FieldType, FieldTypeConfig } from '@ngx-formly/core';

@Component({
  selector: 'formly-field-input',
  template: `
    <input type="input" [formControl]="formControl" [formlyAttributes]="field">
  `,
})
export class InputFieldType extends FieldType<FieldTypeConfig> {}

ngModule 注册组件

@NgModule({
  declarations: [InputFieldType],
    import { InputFieldType } from './intput-field.type';

@NgModule({
  imports: [
    FormlyModule.forRoot({
      types: [
        { name: 'inputOne', component: InputFieldType },
      ],
    }),
  ],
})

types 有两个属性

name：组件类型的名称。type您在字段的选项中使用它。
component：设置此类型时 Formly 应创建的组件。

方式一, 直接把组件传递给字段使用

  fields: FormlyFieldConfig[] = [
    {
      key: 'firstname',
      type: InputFieldType,
    },
  ];

方式二, 使用ngModule 注册的type

  fields: FormlyFieldConfig[] = [
    {
      key: 'firstname',
      type: 'inputOne',
    },
  ];

自定义label 组件

创建一个代表扩展FieldWrapper类的包装器的组件。

import { Component, ViewChild, ViewContainerRef } from '@angular/core';
import { FieldWrapper } from '@ngx-formly/core';

@Component({
  selector: 'formly-wrapper-panel',
  template: `
    <div class="card">
      <h3 class="card-header">Its time to party</h3>
      <h3 class="card-header">{{ props.label }}</h3>
      <div class="card-body">
        <ng-container #fieldComponent></ng-container>
      </div>
      <!-- 报错的信息 -->
        <ng-container *ngIf="showError">
          <formly-validation-message [field]="field"></formly-validation-message>
        </ng-container>
    </div>
  `,
})
export class PanelFieldWrapper extends FieldWrapper {
}

@NgModule({
  declarations: [PanelFieldWrapper],
  imports: [
    FormlyModule.forRoot({
      wrappers: [
        { name: 'panel', component: PanelFieldWrapper },
      ],
    }),
  ],
})

方式一 直接传递组件

fields: FormlyFieldConfig[] = [
  {
    key: 'address',
    wrappers: [PanelFieldWrapper],
    props: { label: 'Address' },
    fieldGroup: [{
      key: 'town',
      type: 'input',
      props: {
        required: true,
        type: 'text',
        label: 'Town',
      },
    }],
  },
];

方法二：将PanelFieldWrapper别名（在 中定义FormlyModule.forRoot）传递给字段配置。

fields: FormlyFieldConfig[] = [
  {
    key: 'address',
+    wrappers: ['panel'],
    props: { label: 'Address' },
    fieldGroup: [{
      key: 'town',
      type: 'input',
      props: {
        required: true,
        type: 'text',
        label: 'Town',
      },
    }],
  },
];

在module组合使用

@NgModule({
  imports: [
    FormlyModule.forRoot({
      types: [
        {
          name: 'operator',
          component: OperatorComponent,   //输入框组件
          wrappers: ['form-field']       //label 组件
        },
      ],
    }),
  ],

自定义扩展接口属性

创建了一个扩展，它定义了一个默认标签（如果它FormlyFieldConfig本身没有定义的话）

定义接口类

*default-label-extension.ts*

import { FormlyExtension } from '@ngx-formly/core';

export const defaultLabelExtension: FormlyExtension = {
  prePopulate(field): void {
    if (field.props?.label) {
      return;
    }
    field.props = {
      ...field.props,
      label: 'Default Label'
    }
  },
};

FormlyExtension允许您定义最多三个方法，这些方法将在表单构建过程中按此顺序调用：

1. prePopulate
2. onPopulate
3. postPopulate

注册自定义扩展

@NgModule({
  imports: [
    FormlyModule.forRoot({
      extensions: [
        {
          name: 'default-label',
          extension: defaultLabelExtension,
          priority:1 // 优先级, 默认1
        }
      ]
    })
  ],
})

lazyRender 延迟加载组件

默认为true

当设置为false, 渲染字段组件并使用CSS控制其可见性。

  constructor(
        private config: FormlyConfig,
    ) {
              this.config.extras.lazyRender = false;
    }
    fields: FormlyFieldConfig[] = [
        {
            key: 'input',
            type: 'input',
            hide:true, // 设置为true,隐藏, 我们发现是通过css隐藏的
            templateOptions: {
                label: 'Input',
                placeholder: 'Input placeholder',
                required: true,
            },
        },
        ]

renderFormlyFieldElement

是否呈现渲染每项中<form-field> 组件里面的dom

默认为true

// 我们发现里面的内容都被隐藏啦  
this.config.extras.renderFormlyFieldElement = false;

我们发现form-field 组件的内容会提取到外层

异步修改值

{
            key: 'input',
            type: 'input',
            props: {
                label: '测试1'
            },
            expressions: {
                'props.label':timer(2000).pipe(
                    map(()=>'修改为2')
                )
            },
}

修改一项的值

    ngOnInit(): void {
        setTimeout(()=>{
            this.fields[0]?.formControl?.setValue('aaaa');
            console.log(this.model);
        },2000)
    }

key 支持括号/点的方式拿到属性

   fields: FormlyFieldConfig[] = [{
            key: 'name[0].age',
            type: 'textarea',
            className: 'flex-1',
        }]

    model = {name: [{age: 'sexName'}]};

fields: FormlyFieldConfig[] = [
    // 多选
        {
            key: 'Select',
            type: 'select',
            props: {
                label: 'Select',
                placeholder: 'Placeholder',
                description: 'Description',
                required: true,
                options: [
                    { value: 1, label: 'Option 1' },
                    { value: 2, label: 'Option 2' },
                    { value: 3, label: 'Option 3' },
                    { value: 4, label: 'Option 4', disabled: true },
                ],
            },
        },
// 多选
        {
            key: 'select_multi',
            type: 'select',
            props: {
                label: 'Select Multiple',
                placeholder: 'Placeholder',
                description: 'Description',
                required: true,
                multiple: true,
                selectAllOption: 'Select All',
                options: [
                    { value: 1, label: 'Option 1' },
                    { value: 2, label: 'Option 2' },
                    { value: 3, label: 'Option 3' },
                    { value: 4, label: 'Option 4', disabled: true },
                ],
            },
        },
    ];

 fields: FormlyFieldConfig[] = [
    {
      key: 'Radio',
      type: 'radio',
      props: {
        label: 'Radio',
        placeholder: 'Placeholder',
        description: 'Description',
        required: true,
        options: [
          { value: 1, label: 'Option 1' },
          { value: 2, label: 'Option 2' },
          { value: 3, label: 'Option 3' },
          { value: 4, label: 'Option 4', disabled: true },
        ],
      },
    },
  ];

fields: FormlyFieldConfig[] = [
    {
      key: 'Checkbox',
      type: 'checkbox',
      props: {
        label: 'Accept terms',
        description: 'In order to proceed, please accept terms',
        pattern: 'true',
        required: true,
      },
      validation: {
        messages: {
          pattern: 'Please accept the terms',
        },
      },
    },
  ];

fields: FormlyFieldConfig[] = [
    {
      key: 'Textarea',
      type: 'textarea',
      props: {
        label: 'Textarea',
        placeholder: 'Placeholder',
        description: 'Description',
        required: true,
      },
    },
  ];

fields: FormlyFieldConfig[] = [
    {
      key: 'Input',
      type: 'input',
      props: {
        label: 'Input',
        placeholder: 'Placeholder',
        description: 'Description',
        required: true,
      },
    },
  ];

__EOF__