/
ng_control_name.ts
132 lines (117 loc) Β· 4.56 KB
/
ng_control_name.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
import {Directive, Host, Inject, OnChanges, OnDestroy, Optional, Self, SimpleChanges, SkipSelf, forwardRef} from '@angular/core';
import {EventEmitter, ObservableWrapper} from '../../facade/async';
import {FormControl} from '../model';
import {NG_ASYNC_VALIDATORS, NG_VALIDATORS} from '../validators';
import {ControlContainer} from './control_container';
import {ControlValueAccessor, NG_VALUE_ACCESSOR} from './control_value_accessor';
import {NgControl} from './ng_control';
import {composeAsyncValidators, composeValidators, controlPath, isPropertyUpdated, selectValueAccessor} from './shared';
import {AsyncValidatorFn, ValidatorFn} from './validators';
export const controlNameBinding: any =
/*@ts2dart_const*/ /* @ts2dart_Provider */ {
provide: NgControl,
useExisting: forwardRef(() => NgControlName)
};
/**
* Creates and binds a control with a specified name to a DOM element.
*
* This directive can only be used as a child of {@link NgForm} or {@link NgFormModel}.
* ### Example
*
* In this example, we create the login and password controls.
* We can work with each control separately: check its validity, get its value, listen to its
* changes.
*
* ```
* @Component({
* selector: "login-comp",
* directives: [FORM_DIRECTIVES],
* template: `
* <form #f="ngForm" (submit)='onLogIn(f.value)'>
* Login <input type='text' ngControl='login' #l="ngForm">
* <div *ngIf="!l.valid">Login is invalid</div>
*
* Password <input type='password' ngControl='password'>
* <button type='submit'>Log in!</button>
* </form>
* `})
* class LoginComp {
* onLogIn(value): void {
* // value === {login: 'some login', password: 'some password'}
* }
* }
* ```
*
* We can also use ngModel to bind a domain model to the form.
*
* ```
* @Component({
* selector: "login-comp",
* directives: [FORM_DIRECTIVES],
* template: `
* <form (submit)='onLogIn()'>
* Login <input type='text' ngControl='login' [(ngModel)]="credentials.login">
* Password <input type='password' ngControl='password'
* [(ngModel)]="credentials.password">
* <button type='submit'>Log in!</button>
* </form>
* `})
* class LoginComp {
* credentials: {login:string, password:string};
*
* onLogIn(): void {
* // this.credentials.login === "some login"
* // this.credentials.password === "some password"
* }
* }
* ```
*
* @experimental
*/
@Directive({
selector: '[ngControl]',
providers: [controlNameBinding],
inputs: ['name: ngControl', 'model: ngModel'],
outputs: ['update: ngModelChange'],
exportAs: 'ngForm'
})
export class NgControlName extends NgControl implements OnChanges,
OnDestroy {
/** @internal */
update = new EventEmitter();
model: any;
viewModel: any;
private _added = false;
constructor(@Host() @SkipSelf() private _parent: ControlContainer,
@Optional() @Self() @Inject(NG_VALIDATORS) private _validators:
/* Array<Validator|Function> */ any[],
@Optional() @Self() @Inject(NG_ASYNC_VALIDATORS) private _asyncValidators:
/* Array<Validator|Function> */ any[],
@Optional() @Self() @Inject(NG_VALUE_ACCESSOR)
valueAccessors: ControlValueAccessor[]) {
super();
this.valueAccessor = selectValueAccessor(this, valueAccessors);
}
ngOnChanges(changes: SimpleChanges) {
if (!this._added) {
this.formDirective.addControl(this);
this._added = true;
}
if (isPropertyUpdated(changes, this.viewModel)) {
this.viewModel = this.model;
this.formDirective.updateModel(this, this.model);
}
}
ngOnDestroy(): void { this.formDirective.removeControl(this); }
viewToModelUpdate(newValue: any): void {
this.viewModel = newValue;
ObservableWrapper.callEmit(this.update, newValue);
}
get path(): string[] { return controlPath(this.name, this._parent); }
get formDirective(): any { return this._parent.formDirective; }
get validator(): ValidatorFn { return composeValidators(this._validators); }
get asyncValidator(): AsyncValidatorFn {
return composeAsyncValidators(this._asyncValidators);
}
get control(): FormControl { return this.formDirective.getControl(this); }
}