{"id":2486,"date":"2016-06-10T12:14:15","date_gmt":"2016-06-10T10:14:15","guid":{"rendered":"https:\/\/www.angulararchitects.io\/?p=2486"},"modified":"2016-06-10T12:14:15","modified_gmt":"2016-06-10T10:14:15","slug":"writing-custom-form-controls-for-angular-2-en","status":"publish","type":"post","link":"https:\/\/www.angulararchitects.io\/en\/blog\/writing-custom-form-controls-for-angular-2-en\/","title":{"rendered":"Writing Custom Form Controls For Angular 2 [EN]"},"content":{"rendered":"
\n

\nUpdate in January 2017: This article has been updated for the final API of Angular 2.x.\n<\/p><\/blockquote>\n

If you want your components to work with declarative (template-driven)<\/a> and imperative forms, you have to implement the interface ControlValueAccessor<\/code><\/a>. The methods defined by this interface permit Angular 2 to read and set the state of the control in question.<\/p>\n

Such controls can be used with ngModel<\/code> or ngControl<\/code>. To illustrate this, the following example uses a custom date-control<\/code> that binds a variable date<\/code> with ngModel<\/code>:<\/p>\n

<!-- Deklaratives (template-driven) Forms-Handling \n<date-control [(ngModel)]=\"date\"><\/date-control>\n<\/code><\/pre>\n
Alternatively, such a component can use imperative forms to bind to a predefined Control<\/code>-object. The following example illustrates this by binding the date-control<\/code> with formControlName<\/code> to the FormControl<\/code> with the name date<\/code>. Angular expects this Control-object in the FormGroup<\/code> that has been specified with formGroup<\/code>:<\/p>\n
<!-- Imperatives Forms-Handling -->\n<form [formGroup]=\"filter\">   \n    <date-control formControlName=\"date\"><\/date-control>\n    [...]\n<\/form>\n<\/code><\/pre>\n
The ControlGroup<\/code> and the Control<\/code> are provided via the component:<\/p>\n
@Component({\n    selector: 'flight-search',  \n    template: require('.\/flight-search.component.html'),\n    directives: [DateControlComponent]\n})\nexport class FlightSearchImpComponent {\n\n    public filter: FormGroup;\n\n    constructor(private fb: FormBuilder) {\n\n        this.filter = fb.group({\n           date: ['2016-05-01']\n        });\n    }\n\n    [...]\n}\n<\/code><\/pre>\n
This article describes the steps necessary to implement ControlValueAccessor<\/code>. The total sample<\/a> can be found here<\/a>.<\/p>\n
ControlValueAccessor<\/h2>\n
The interface ControlValueAccessor<\/code> provides three methods for synchronizing the state of a control with the object graph Angular uses to represent a form:<\/p>\n
\/\/\n\/\/ From the Angular2-Sources\n\/\/\nexport interface ControlValueAccessor {\n    writeValue(obj: any): void;\n    registerOnChange(fn: any): void;\n    registerOnTouched(fn: any): void;\n}\n<\/code><\/pre>\n
To write a value to the control, Angular uses the method writeValue<\/code>. Since Angular must know about changes to the date, the SPA-flagship uses registerOnChange<\/code> and registerOnTouched<\/code> to register callbacks. The control has to call the first one, when the users changes the state. The latter one indicates that the field at least had the focus.<\/p>\n
Implementing ControlValueAccessor<\/h2>\n
The following example demonstrates the implementation of the interface ControlValueAccessor<\/code>. For this, it shows a simple component for editing dates. The method splitDate<\/code> takes a date and breaks it down into its parts, which are offered for editing by the (here not shown) template. The method apply<\/code> is putting those together to a date again.<\/p>\n
import { Component } from '@angular\/core';\nimport { ControlValueAccessor, NgControl } from '@angular\/forms';\n\n@Component({\n    selector: 'date-control',\n    template: require('.\/date-control.component.html')\n})\nexport class DateControlComponent \n                    implements ControlValueAccessor {\n\n    day: number;\n    month: number;\n    year: number;\n    hour: number;\n    minute: number;\n\n    constructor(private c: NgControl) {\n        c.valueAccessor = this;\n    }\n\n    writeValue(value: any) {\n        this.splitDate(value);\n    }\n\n    onChange = (_) => {};\n    onTouched = () => {};\n\n    registerOnChange(fn): void { this.onChange = fn; }\n    registerOnTouched(fn): void { this.onTouched = fn; }\n\n    splitDate(dateString) {\n      var date = new Date(dateString); \n\n      this.day = date.getDate();\n      this.month = date.getMonth() + 1;\n      this.year = date.getFullYear();\n      this.hour = date.getHours();\n      this.minute = date.getMinutes();\n    }\n\n    apply() {\n\n        var date = new Date();\n        date.setDate(this.day);\n        date.setMonth(this.month - 1);\n        date.setFullYear(this.year);\n        date.setHours(this.hour);\n        date.setMinutes(this.minute);\n        date.setSeconds(0);\n        date.setMilliseconds(0);\n\n        this.onChange(date.toISOString());\n        this.onTouched();\n    }\n\n}\n<\/code><\/pre>\n
To be able to interact with the Forms-Handling of Angular 2, the component implements the interface ControlValueAccessor<\/code>. In addition, it gets the current NgControl<\/code> by the means of Dependency Injection. Angular uses this instance to represent the control within the object graph that has been created for the form. It sets the property ValueAccessor<\/code> to the component itself. This means, that the component is it's own ValueAccessor<\/code>.<\/p>\n
The implementation of writeValue<\/code> takes a new value from the framework and delegates it to splitDate<\/code>. The implementations of registerOnChange<\/code> and registerOnTouched<\/code> however take callbacks from Angular and puts them into onChange<\/code> and onTouched<\/code>.<\/p>\n
After the date has been changed, the template invokes the method apply<\/code>. It adds the individual parts of the date together and passes it to Angular using onChange<\/code>. In addition, for the sake of completeness, it executes the calback onTouched<\/code>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Writing Custom Form Controls For Angular 2 [EN]<\/p>\n","protected":false},"author":9,"featured_media":2997,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2486","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unkategorisiert"],"acf":[],"yoast_head":"\nWriting Custom Form Controls For Angular 2 [EN] - ANGULARarchitects<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.angulararchitects.io\/en\/blog\/writing-custom-form-controls-for-angular-2-en\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Writing Custom Form Controls For Angular 2 [EN] - 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