Function getURLParameter

getURLParameter(name: string): string
Retrieves the value of the named URL parameter. In case a parameter is specified multiple times, only the value of the first occurrence is returned.

If the URL is as follows:

https://formcloud.de/formcycle/form/provide/9999?name=James&preview&mode=&name=John

Then this function returns:
```
getURLParameter("name"); // => "James"
getURLParameter("preview") // => undefined
getURLParameter("mode"); // => ""
getURLParameter("other"); // => undefined
```
Parameters
- name: string
  Name of the URL parameter to retrieve.
Returns string
The value of the URL parameter with the given name, or undefined if no such URL parameter exists.