In my experience, Angular will generate an error if a form tag in HTML contains special characters, such as the colon symbol ':' in the 'name' attribute

Currently, I am in the midst of a Salesforce project and I am contemplating utilizing Angular JS for its remarkable capabilities. One issue I have encountered is that Salesforce prefixes form attributes like name and id with dynamic IDs. For example, if the form attribute name is customer_registration, it changes to i10_j30:customer_registration.

An obstacle I faced was when Angular produced an error due to special characters, particularly ':' in the form's name attribute.

These are the questions that arose:

  1. Why does Angular restrict the use of ':' in form names even though they are permitted by browsers?
  2. What are possible solutions or workarounds to address this issue?

Answer №1

AngularJS Developer Guide -- Upgrading from Version 1.3 to 1.4

Form

Recently, commit 94533e57 made a change regarding the name attribute of form elements in AngularJS. Now, the name attribute should only contain characters that can be evaluated as part of an Angular expression. This adjustment was necessary because Angular now uses the value of the name attribute as an assignable expression to set the form on the $scope. For instance, using name="myForm" will assign the form to $scope.myForm, while name="myObj.myForm" will assign it to $scope.myObj.myForm.

In the past, special characters like colons (e.g. name="my:name") were allowed due to Angular's use of a specific setter function for form names. However, this functionality has been replaced with a more robust $parse setter.

To update your code accordingly, it is recommended to remove any special characters from the name attribute.

If you must retain special characters in the name attribute, you can utilize the provided directive. This directive replaces the name with an expression-friendly value during compilation and then restores the original name in the post-linking phase. By doing this, it ensures that the form is appropriately published on the scope and retains the original name, which may be crucial for server-side form submissions.

angular.module('myApp').directive('form', function() {
  return {
    restrict: 'E',
    priority: 1000,
    compile: function(element, attrs) {
      var unsupportedCharacter = ':'; // adjust as needed
      var originalName = attrs.name;
      if (attrs.name && attrs.name.indexOf(unsupportedCharacter) >= 0) {
        attrs.$set('name', 'this["' + originalName + '"]');
      }

      return postLinkFunction(scope, element) {
        // Ensure original name is preserved
        element.setAttribute('name', originalName);
      }
    }
  };
});

Answer №2

Issues may arise when using ':' to access a form element by name.

For further discussion on this topic, check out the following link:

https://github.com/angular/angular.js/issues/13771

.directive('form', function() {
  return {
    restrict: 'E',
    priority: 1000,
    compile: function(element, attrs) {
      if (attrs.name && attrs.name.indexOf(':') > 0) {
        attrs.$set('name', 'this["' + attrs.name + '"]');
        console.log(attrs);
      }
    }
  };
});

A suggested workaround is to create a custom form directive.

Check out these examples for more information:

http://plnkr.co/edit/414QyUt32eZ129kJeJik?p=preview

http://plnkr.co/edit/VuHgBr5EQHTLJrk0HEVC?p=preview

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