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Problem :

I am facing following error from the Angular 2

core.umd.js:5995 EXCEPTION: Uncaught (in promise): Error: Error in app/model_exposure_currencies/model_exposure_currencies.component.html:57:18 caused by: If ngModel is used within a form tag, either the name attribute must be set or the form control must be defined as 'standalone' in ngModelOptions.

Example 1: <input [(ngModel)]="person.myfirstName" name="myfirst">
Example 2: <input [(ngModel)]="person.myfirstName" [ngModelOptions]="{standalone: true}">
<td *ngFor="let lag of ce.lags">
    <div class="form-group1">
        <input name="myname" [(ngModel)]="lag.myname" [ngModelOptions]="{standalone: true}"  class="form-control" pattern="[0-9]*(\.[0-9]+)?" required>

Below is my form tag:

<form #f="ngForm" (ngSubmit)="onSubmit()">
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1 Answer

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Solution :

Try following code to fix your issue...

<input type="text" class="form-control" name="myname" placeholder="Name"required minlength="4" #myname="ngModel" ngModel>
<div *ngIf="myname.errors && (myname.dirty || myname.touched)">
<div [hidden]="!myname.errors.required" class="alert alert-danger form-alert">
Please enter your name.
<div [hidden]="!myname.errors.minlength" class="alert alert-danger form-alert">
Enter name greater than four characters.



 I simply added the name attribute for the select and checkbox and that fixed my issue. As shown below :

<mat-select placeholder="Select the option" name="Select" [(ngModel)]="sample.stat"> <!--HERE: please Observe the "name" attribute -->
<input id="Input" type="text" placeholder="Enter only number" aria-label="Number" matInput [formControl]="FormControl" required [(ngModel)]="number">  <!--HERE -->
<mat-checkbox name="Check" [(ngModel)]="isRight">Check!</mat-checkbox> <!--HERE: Please Observe the "name" attribute -->

As you can see I added the name attribute. It is not mandetory to be  same as your ngModel name. Just providing the correct name attribute will fix your issue.

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