Encountering an 'undefined' property error when clicking a button in Angular 1.x

Question

Encountering an 'undefined' property error when clicking a button in Angular 1.x

Hey there, I have a question that might seem simple to some of you. I'm struggling with fixing an error and I don't quite understand why it's happening :(

This error popped up while using Angular 1.x. What I need help with is creating an alert when the user clicks a button without entering a title in the form.

Let me share my code here, keeping it simple and easy to follow :D

index.html

<div class="form-group">
    <label for="">Title</label>
    <input type="text" ng-model="shipment_template.title" class="form-control">
</div>

<button ng-click="check">Check This</button>

Here's how I handled it in my controller:

shipmentTemplate.controller.js

if (typeof $scope.shipment_template.title == 'undefined') {

    console.log("success")
} else {

    alert("Please fill the title")
}

The issue arises when I enter something in the input field, I see success in the console. However, if I leave it empty, I encounter this error instead.

Cannot read property 'title' of undefined

I initially tried using the length property instead of typeof, but unfortunately, it led to the same error :(

Apologies for any language errors in my explanation, and I would greatly appreciate your assistance in resolving this matter. Thanks! :-D

javascript angularjs

Answer 1

Answer №1

To solve the issue, simply pass the model into your check function like this:

Here is the HTML code:

<div class="form-group">
 <label for="">Title</label>
 <input type="text" ng-model="shipment_template.title" class="form-control">
</div>

<button ng-click="check(shipment_template.title)">Check This</button>

And here is the JavaScript code:

  $scope.check = function(input) {
    if (input) {
      console.log("success");
    }
    else {
      alert("Please fill the title");
    }
  }

This approach provides a clearer way to achieve your desired result. You can view the working code by visiting: Plunkr

Answer 2

To solve the issue, simply pass the model into your check function like this:

Here is the HTML code:

<div class="form-group">
 <label for="">Title</label>
 <input type="text" ng-model="shipment_template.title" class="form-control">
</div>

<button ng-click="check(shipment_template.title)">Check This</button>

And here is the JavaScript code:

  $scope.check = function(input) {
    if (input) {
      console.log("success");
    }
    else {
      alert("Please fill the title");
    }
  }

This approach provides a clearer way to achieve your desired result. You can view the working code by visiting: Plunkr

Answer 3

Answer №2

To initialize the delivery_template in your controller, you can follow this code example:

deliveryTemplate.controller.js

$scope.delivery_template = {'name':''};

Answer 4

To initialize the delivery_template in your controller, you can follow this code example:

deliveryTemplate.controller.js

$scope.delivery_template = {'name':''};

Encountering an 'undefined' property error when clicking a button in Angular 1.x

Answer №1

Answer №2

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