formly-form 动态表单

动态表单库

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

安装

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

@ngx-formly/ng-zorro-antd

选择UI

• • • 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@gmail.com' };
  fields: FormlyFieldConfig[] = [
    {
      key: 'email',
      type: 'input',
      props: {
        label: 'Email address',
        placeholder: 'Enter email',
        required: true,
      }
    }
  ];

Name	Type	Default	Required	Description
form	FormGroup or FormArray	new FormGroup({})	no	表单实例
fields	FormlyFieldConfig[]		yes	构建表单的字段配置
model	any		yes	表单表示的模型
options	FormlyFormOptions		no	表格的选项

(modelChange) model 值发生变量的时候触发的事件

fields

Attribute	Type	Description
key	string	model 的键
id	string	请注意，id如果未设置，则会生成。
name	string	过于的表单name才有效
type	string	自定义模板
className	string	自定的class样式formly-field directive.
props	object	任何特定于模板的选项都放在此处
templateOptions	object	任何特定于模板的选项都放在此处,props进行改用(props权重高一些)
template	string	自定义html内容, 而不是type
defaultValue	any	model 为设置,或者为undefined, 该模型的值被分配
hide	boolean	是否隐藏字段
hideExpression	boolean/string/function	有条件地隐藏该字段
expressions	boolean/string/function	一个对象，其中键是要在主字段配置上设置的属性，值是用于分配该属性的表达式。
focus	boolean	是否获取焦点. 默认为 false. 可以用 expressions进行设置
wrappers	string[]	自定义组件里面包装label , 可以设置样式
parsers	function[]	每当模型更新（通常通过用户输入）时，作为管道执行的函数数组
fieldGroup	FormlyFieldConfig[]	字段组, 让高级布局更简单, 对于通过模型关联的字段进行分组
fieldArray	FormlyFieldConfig
fieldGroupClassName	string	formly-group组件的class
validation	object	校验messages 信息的显示
validators	any	特定字段设置验证规则
asyncValidators	any	异步验证的内容
formControl	AbstractControl	该字段的FormControl。它为您提供更多控制，如运行验证器、计算状态和重置状态。
modelOptions	object	控制模型更改的有用属性的对象: debounce, updateOn

 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;
    },
  },
},

条件

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

点击

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;
  }

生命周期

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

参数

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

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

例如

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。

页面使用

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 {
}

使用

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

页面使用

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。

例如

  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'}]};

下拉框

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 },
                ],
            },
        },
    ];

单选

 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 },
        ],
      },
    },
  ];

复选

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,
      },
    },
  ];