unable to apply angular measurement inside quotation marks

What is the reason for this issue:

<ul class="dropdown-menu">
  <li ng-repeat="choice in dropDownItems">
    <a class="btn" ng-click="mnuClick('{{choice}}')">{{choice}}</a>
  </li>
</ul>

However, this code works correctly:

<ul class="dropdown-menu">
  <li ng-repeat="choice in dropDownItems">
    <a class="btn" ng-click="mnuClick('xxx')">{{choice}}</a>
  </li>
</ul>

The problem in the first example is that the mnuClick() function is not being triggered, while in the second example it is. Even after 'inspecting element,' everything seems to be set up correctly.

javascriptangularjs

Answer №1

The method you used won't work as intended because it implies that you are passing the string {{choice}} to the function mnuClick.

When using xxx, this is the correct approach and requires the use of quotes.

However, when using {{choice}}, you are not aiming for a literal string but rather for an evaluated expression whose outcome (most likely a string) should be passed as a parameter - therefore, in this case, the quotes (and even the curly braces) are unnecessary.

To simplify, one scenario involves dealing with an expression that results in a string, while the other involves working directly with a string. This is why quotes are required in one instance and not in the other.

To gain more insight into when to utilize curly braces and when to avoid them, refer to this answer to the question: Difference between double and single curly brace in angular JS?

I hope this explanation proves helpful.

PS: Within the text of your a tag, you must use the double curly braces since you are outside of an AngularJS controlled code-block, signifying that it is a binding operation; otherwise, it would just be considered plain text within HTML.

Answer №2

When using ng-click, the value is considered an angular expression and there is no need to include curly brackets around "choice". Simply write it in this format:

<a class="btn" ng-click="mnuClick(choice)">{{choice}}</a>

Answer №3

Is this the correct solution?

ng-click="mnuClick(choice)"

I have implemented a similar approach before, although I do not currently have access to the code to confirm...

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