Drew13 Drew13 - 11 months ago 129
HTML Question

Populate input using @Input inside Bootstrap 4 modal

I have a main page with a table that when a row is clicked on, it uses

@Output
to send out that row's data (I've already confirmed the data is being sent properly by using it in another place in the project). I then have a Bootstrap 4 modal that pops up when I click the button on the left below where it says "Data Point Information". What I need to do is take the data from the row that was clicked on, and populate the form inside the modal with it.

Main Page:enter image description here

Modal:enter image description here

HTML for the modal:

<div class="modal fade" id="myModal2" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog bodyWidth">
<div class="modal-content wide">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Update Data Point</h4>
</div>
<div class="modal-body">
<form class="form-inline" [formGroup]="updateForm" (ngSubmit)="submitForm(updateForm.value)">
<div class="row">
<div class="form-group" [ngClass]="{'has-error':!updateForm.controls['dataPoint'].valid && updateForm.controls['dataPoint'].touched}">
<label>Data Point:</label>
<input class="form-control special" type="text" [formControl]="updateForm.controls['dataPoint']">
</div>
<div class="form-group move" [ngClass]="{'has-error':!updateForm.controls['ICCP'].valid && updateForm.controls['ICCP'].touched}">
<label >ICCP:</label>
<input type="text" class="form-control special" [formControl]="updateForm.controls['ICCP']">
</div>
<div class="form-group" [ngClass]="{'has-error':!updateForm.controls['startDate'].valid && updateForm.controls['startDate'].touched}">
<label>Start Date:</label>
<input [value]="getDate('start')" class="form-control special" type="text" [formControl]="updateForm.controls['startDate']" style="margin-right: 4px;">
</div>
<div style="display:inline-block">
<ngb-datepicker id="special" *ngIf="startCheck;" [(ngModel)]="startDate" (ngModelChange)="showDatePick(0)" [ngModelOptions]="{standalone: true}"></ngb-datepicker>
</div>
<button type="button" class="btn icon-calendar closest" (click)="showDatePick(0)"></button>
<div class="form-group" [ngClass]="{'has-error':!updateForm.controls['endDate'].valid && updateForm.controls['endDate'].touched}">
<label >End Date:</label>
<input [value]="getDate('end')" class="form-control special" type="text" [formControl]="updateForm.controls['endDate']">
</div>
<div style="display:inline-block">
<ngb-datepicker id="special" *ngIf="endCheck;" [(ngModel)]="endDate" (ngModelChange)="showDatePick(1)" [ngModelOptions]="{standalone: true}"></ngb-datepicker>
</div>
<button type="button" class="btn icon-calendar closer" (click)="showDatePick(1)"></button>
</div>
</form>
</div>
<div class="modal-footer">
*All Fields Are Required. End Date must be after Start Date
<button type="submit" class="btn" [disabled]="!updateForm.valid" data-dismiss="modal">Update</button>
<button type="button" (click)="resetForm()" class="btn" data-dismiss="modal">Cancel</button>
</div>
</div>
</div>
</div>


Typescript for the modal:

@Component({
selector: 'update-validation',
styleUrls: ['../app.component.css'],
templateUrl: 'update.component.html',
providers: [DatePipe]
})
export class UpdateComponent {
@Input() receivedRow:DataTable;
public dt: NgbDateStruct;
public dt2: NgbDateStruct;
public startCheck: boolean = false;
public endCheck: boolean = false;
updateForm : FormGroup;

constructor(fb: FormBuilder, private datePipe: DatePipe){
this.updateForm = fb.group({
'dataPoint' : [DPS[0].tDataPoint, Validators.required],
'ICCP' : [DPS[0].tICCP, Validators.required],
'startDate' : [DPS[0].tStartDate, Validators.required],
'endDate' : [DPS[0].tEndDate, Validators.required]
}, {validator: this.endDateAfterOrEqualValidator})
}

resetForm(){
location.reload();
//this.updateForm.reset();
}

submitForm(value: any){
console.log(value);
}

public getDate(dateName: string) {
let workingDateName = dateName + 'Date';
let timestamp = this[workingDateName] != null ? new Date(this[workingDateName].year, this[workingDateName].month-1, this[workingDateName].day).getTime() : new Date().getTime();
this.updateForm.controls[dateName + 'Date'].setValue(this.datePipe.transform(timestamp, 'MM/dd/yyyy'));
}

public showDatePick(selector):void {
if(selector === 0) {
this.startCheck = !this.startCheck
} else {
this.endCheck = !this.endCheck;
}
}

endDateAfterOrEqualValidator(formGroup): any {
var startDateTimestamp, endDateTimestamp;
for(var controlName in formGroup.controls) {
if (controlName.indexOf("startDate") !== -1) {
startDateTimestamp = Date.parse(formGroup.controls[controlName].value);
}
if (controlName.indexOf("endDate") !== -1) {
endDateTimestamp = Date.parse(formGroup.controls[controlName].value);
}
}
return (endDateTimestamp < startDateTimestamp) ? { endDateLessThanStartDate: true } : null;
}
}


HTML from the main page that places modal there using it's selector (
toSend
is of type
DataTable
which is the data from the row I am sending from the main page's Typescript):

<update-validation [receivedRow]='toSend'></update-validation>


Since I'm using
@Output
and
@Input
, I'm not sure why
receivedRow
in my Typescript is undefined.

Answer Source

The reason is that when your component of modal initialized, there were not any receivedRow. You should control it with *ngIf directive and ngOnChange method like that;

//xyz is just any field on your parent component

//in html
<div *ngIf="xyz">
     <update-validation [receivedRow]="xyz"></update-validation>
</div>

//in component of modal
ngOnChanges(){
     if(receivedRow){
          //do whatever you want
     }
}