Is it possible to declare and assign a value to a global variable in one JavaScript file and then reference it in another JavaScript file multiple times?
Can Angular.js be utilized in a Velocity macro file, aside from HTML files?
Is it possible to declare and assign a value to a global variable in one JavaScript file and then reference it in another JavaScript file multiple times?
Can Angular.js be utilized in a Velocity macro file, aside from HTML files?
When a global variable is defined in a script, it becomes accessible to all other scripts on the same page. Global variables are truly global, meaning they can be used in any Javascript code within that page.
However, Javascript variables only persist for the current page session. Once you navigate to a new page, all global variables from the previous page are lost, and a new Javascript context is created with the new page's scripts. Variables do not carry over between pages.
To maintain state across different pages, the data must be stored either on the server (for server-side retrieval), in a cookie (for client-side access), or in LocalStorage (to be accessible by scripts on the user's machine).
For example, if you wanted to save and retrieve a value stored in a variable named username, you could use the following code:
// Store the variable in localStorage
localStorage.setItem("user", username);
// Retrieve the value on another page
var username = localStorage.getItem("user");
To incorporate localStorage variable into your code, follow these steps:
<script>
var data=localStorage.setItem("data","information");
</script>
Think of this as a universal variable that can be accessed from any other script like so:
<script>
var info=localStorage.getItem("data");
</script>
Firstly, let me address some of the comments that have been mentioned: It is important to note that a global variable will only be accessible for the Javascript that is loaded on the same page.
If you are utilizing Angular, it is advisable to use a constant (for example, check out ). However, this is primarily applicable for single-page applications.
While you can use Velocity to render your HTML and JS files, it is crucial to exercise caution as Velocity has its own templating system, and so does Angular. Mixing these two types of templating can lead to issues in terms of maintainability and separation of concerns. It is recommended to choose one system to fully utilize and only resort to the other when absolutely necessary, avoiding their simultaneous use for the same purpose.
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