Created
October 21, 2017 17:13
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Angular reactive form with conditionally pre-set data
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import { Component, OnInit } from '@angular/core'; | |
import { NavParams } from 'ionic-angular'; | |
import { FormBuilder, FormGroup, Validators } from '@angular/forms'; | |
import { StudentsProvider } from '../../../providers/students-provider'; | |
@Component({ | |
selector: 'student-form', | |
templateUrl: 'student-form.html' | |
}) | |
export class StudentForm implements OnInit { | |
private studentId: number; | |
private student: any; | |
private studentForm: FormGroup; | |
constructor( | |
private studentsProvider: StudentsProvider, | |
private navParams: NavParams, | |
private fb: FormBuilder | |
) {} | |
ngOnInit() { | |
this.studentId = this.navParams.get('studentId'); | |
this.student = this.studentId !== null ? this.studentsProvider.getStudent(this.studentId) : null; | |
this.studentForm = this.fb.group({ | |
firstName: [''], | |
lastName: [''], | |
birthday: [''], | |
gradeLevel: [''], | |
schoolYear: [''] | |
}); | |
if (typeof this.student !== undefined) { | |
this.studentForm.setValue({ | |
firstName: this.student.firstName, | |
lastName: this.student.lastName, | |
birthday: this.student.birthday, | |
gradeLevel: this.student.gradeLevel, | |
schoolYear: this.student.schoolYear | |
}); | |
} | |
} | |
} |
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import { Injectable } from '@angular/core'; | |
import 'rxjs/add/operator/map'; | |
@Injectable() | |
export class StudentsProvider { | |
private students: any[] = [ | |
{ | |
firstName: 'JC', | |
lastName: 'Denton', | |
birthday: '', | |
gradeLevel: '3rd', | |
schoolYear: '2016-2017' | |
}, | |
{ | |
firstName: 'Paul', | |
lastName: 'Denton', | |
birthday: '', | |
gradeLevel: '3rd', | |
schoolYear: '2016-2017' | |
}, | |
{ | |
firstName: 'Bob', | |
lastName: 'Page', | |
birthday: '', | |
gradeLevel: '3rd', | |
schoolYear: '2016-2017' | |
} | |
]; | |
constructor() { | |
} | |
getStudents() { | |
return this.students; | |
} | |
getStudent(id) { | |
return this.students[id]; | |
} | |
} |
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