Using interpolation brackets in Angular2 for variables instead of dots

I'm curious if Angular2 has a feature similar to the bracket notation in Javascript that allows you to use variables to select an object property, or if there is another method to achieve the same functionality.

Here is the code snippet for reference:

 let selector = "foo";
 let someObject = {foo: "some content", guu: "some other content"};
 console.log(someObject[selector]); // using bracket notation, logs "some content"

In my attempts with Angular2:

  {{someObject[selector]}}
  {{someObject['selector']}}

Unfortunately, neither of these approaches worked. Is there an alternative way to achieve this without relying on Javascript?

Answer №1

Everything seems to be functioning correctly in Angular based on this example: https://stackblitz.com/edit/angular-mrky5n.

A few potential reasons why it might not be working in your current application:

1) If the 'selector' variable contains a string selector, it's possible that the 'selector' variable is not accessible within the template's scope (e.g. it could be 'private' in the component class, defined within a method, or part of a lifecycle hook).

2) If 'selector' is the intended property to access, there may be a typo in the name ('selectro' or 'selecter'). This can lead to issues since TypeScript's type checking would be lost. For example, while 'someObject.selectorr' throws an error, 'someObject['selectorr']' works without any problems.

3) It's likely that the property has not been assigned a value yet -- incorporating the safe navigation operator could potentially resolve this issue.

Answer №2

Within Angular's template syntax, various JavaScript functionalities are supported, such as bracket notation.

The {{someObject[selector]}} expression is reliant on both someObject and selector being properties of the component. It will not function correctly if they are local variables declared with let.

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