Ensuring Form Field Validation in Angular JS Prior to Submission

Question

Ensuring Form Field Validation in Angular JS Prior to Submission

I am currently in the process of developing an Angular JS application that features a 2-step form. This form essentially consists of one form, but utilizes JavaScript to hide the initial panel and reveal the second panel when the user clicks the 'next' button to proceed to step 2. Although I have implemented 'required' validations on certain fields in step 1, these validations are not triggered when the user clicks the 'next' button; instead, they are only enforced when the user clicks the final 'submit' button at the conclusion of step 2.

I am curious if there is a method to instruct Angular to validate these fields in the form when the 'next' button is clicked?

javascript angularjs validation

Answer 1

Answer №1

If you're looking for a solution, I recommend utilizing sub-forms. AngularJS allows nesting forms within each other, and the validation seamlessly passes from the sub-form to the parent form;

For a practical demonstration, check out this example: http://plnkr.co/edit/SruBmlGZZtbwiU8cktAp?p=preview

Here's a snippet of code to aid in understanding the concept:

  <form name='myform' ng-init="step = 1">
    <div ng-show="step==1">
      <h3>Step 1: Enter some general info</h3>
      <div ng-form='step1form'>
        Name: <input ng-model="name" required>
      </div>
      <button ng-disabled="!step1form.$valid" ng-click="step = 2">Next</button>
    </div>

    <div ng-show="step==2">
      <h3>Step 2: Final info</h3>
      <div ng-form="step2form">
          Phone: <input ng-model="phone" required>
      </div>
      <button  ng-click="step = 1">Prev</button>
      <button ng-disabled="!myform.$valid" ng-click="submit()">Submit</button>
    </div>
    <div>
      Validation status:
      <div> Whole form valid? {{myform.$valid}} </div>
      <div> Step1 valid? {{step1form.$valid}} </div>
      <div> Step2 valid? {{step2form.$valid}} </div>
    </div>
  </form>

Answer 2

If you're looking for a solution, I recommend utilizing sub-forms. AngularJS allows nesting forms within each other, and the validation seamlessly passes from the sub-form to the parent form;

For a practical demonstration, check out this example: http://plnkr.co/edit/SruBmlGZZtbwiU8cktAp?p=preview

Here's a snippet of code to aid in understanding the concept:

  <form name='myform' ng-init="step = 1">
    <div ng-show="step==1">
      <h3>Step 1: Enter some general info</h3>
      <div ng-form='step1form'>
        Name: <input ng-model="name" required>
      </div>
      <button ng-disabled="!step1form.$valid" ng-click="step = 2">Next</button>
    </div>

    <div ng-show="step==2">
      <h3>Step 2: Final info</h3>
      <div ng-form="step2form">
          Phone: <input ng-model="phone" required>
      </div>
      <button  ng-click="step = 1">Prev</button>
      <button ng-disabled="!myform.$valid" ng-click="submit()">Submit</button>
    </div>
    <div>
      Validation status:
      <div> Whole form valid? {{myform.$valid}} </div>
      <div> Step1 valid? {{step1form.$valid}} </div>
      <div> Step2 valid? {{step2form.$valid}} </div>
    </div>
  </form>

Ensuring Form Field Validation in Angular JS Prior to Submission

Answer №1

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