The switch statement within Angular returns null when using getElementById()

In my single page application, I am using ng-switch to switch between different 'pages'. One of these pages contains a modal that is opened using the following function:

var modal = document.getElementById('myModal');
vm.openModal = function(src) {
   modal.style.display = 'block';
   modalImg.src = src;
};
modal.onclick = function() {
    modal.style.display = 'none';
};

Here is the corresponding HTML code:

<div ng-switch="vm.step.name">
  <div ng-switch-when="prepare">
      Content for the first page
  </div>
  <div ng-switch-when="action">
      Content for the second page
      <button ng-click="vm.openModal('bootHP.jpg')">Open modal</button>
      <!-- The Modal -->
      <div id="myModal" class="modal-instruction absolute block">
        <img class="modal-content-guide centered" id="img01">
      </div>
  </div>
</div>

The issue I'm facing is that the variable modal is being set to null, indicating that it cannot find the element with the id 'myModal' when switching pages. Can someone help me understand why this is happening and suggest a solution?

Thank you for any assistance!

Answer №1

When calling document.getElementById from the controller body (i.e. when it is executed during construction), the DOM within the ng-switch may not be available yet.

To ensure it exists, you can wait to retrieve it only when openModal() is triggered.

vm.openModal = function(src) {
    var modal = angular.element('#myModal');
    modal.css('display', 'block');
    modalImg.src = src;
};

With regards to the click event, make sure to remove the event listener when your controller is destroyed.

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