Working on an update form which I would like to generate and capture inputs for a variable sized array
The current unhappy version only supports the first three statically defined elements in the constituency array. So the inputs look like this...
<input #newConstituency1 class="form-control" value={{legislatorToDisplay?.constituency[0]}}>
<input #newConstituency2 class="form-control" value={{legislatorToDisplay?.constituency[1]}}>
<input #newConstituency3 class="form-control" value={{legislatorToDisplay?.constituency[2]}}>
and the function to update pulls the values of the form using the static octothorpe tags.
updateLegislator(newConstituency1.value, newConstituency2.value, newConstituency3.value)
But this doesn't allow for a variable sized Constituency array.
I am able to use *ngFor
directive to dynamically create input fields for a theoretically infinitely sized constituency array:
<div *ngfor constit of legislatorToDisplay?.constituency>
<input value={{constit}}>
</div>
but have not successfully been able to capture that information thereafter. Any kind assistance would be greatly appreciated.
Use two-way data binding:
<div *ngFor="constit of legislatorToDisplay?.constituency; let i = index">
<input [(ngModel)]="legislatorToDisplay?.constituency[i]">
</div>
You just have to have a form object in your component that matches the HTML input components that were created.
Template
<div *ngfor constit of legislatorToDisplay?.constituency>
<input value={{constit}} formControlName="{{constit}}">
</div>
Component
/* create an empty form then loop through values and add control
fb is a FormBuilder object. */
let form = this.fb.group({});
for(let const of legislatorToDisplay.constituency) {
form.addControl(new FormControl(const))
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.