Modifying TJSArray object members
lazarus / 76-Pas2JS

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rlsdevine · 2023-02-08 00:58

I'm actually using pas2js from TMS WebCore (Delphi) but this question
seems to be a pas2js thing. I have a TJSArray (retrieved via JSON from
an API call) that holds a number of objects that define users, e.g. in
Object Pascal:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i   TUser =
record    FirstName: string;    Surname: string;    DisplayName:
string;  end;
My TJSArray is a private field variable of the class:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i   private 
 FUserList: TJSArray;
I'm testing different ways of modifying members of the array:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i   // -- The
following works correctly.  asm    this.FUserList[0].DisplayName =
"Bob1";  end;  console.log('DisplayName: ' +
TUser(FUserList[0]).DisplayName);   // -- The following line fails to
compile: "Variable identifier expected". 
//TUser(FUserList[0]).DisplayName := 'Bob2'; 
//console.log('DisplayName: ' + TUser(FUserList[0]).DisplayName);   //
-- The following works correctly. 
TJSObject(FUserList[0]).Properties['DisplayName'] := 'Bob3'; 
console.log('DisplayName: ' + TUser(FUserList[0]).DisplayName);
The puzzle is that I can hard cast TUser(FUserList[0]) to get the
DisplayName for the console output, but can't get it to compile when
setting the value. Obviously not a show-stopper but curious how to get
around this. I also tried (FUserList[0] as TUser) but that won't
compile either.

Thanks, Bob