Delphi ActiveX

JavaScript console

See more JavaScript Examples

Demonstrates console output using Chilkat JavaScript. Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
sbScript: TChilkatStringBuilder;
js: TChilkatJs;
result: TChilkatJsonObject;
sbOut: TChilkatStringBuilder;

begin
success := 0;

// This example demonstrates using the built-in console object.
// The Javascript run in this example is shown below.

// Load the JavaScript from a file.
sbScript := TChilkatStringBuilder.Create(Self);
success := sbScript.LoadFile('qa_data/js_tests/test_console.js','utf-8');
if (success = 0) then
  begin
    Memo1.Lines.Add(sbScript.LastErrorText);
    Exit;
  end;

js := TChilkatJs.Create(Self);
result := TChilkatJsonObject.Create(Self);

// Run the JavaScript
// Results (not console output) go to result.
// Note: Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
// In this case, the last evaluated expression is console.log which does not calculate a value. Therefore, it returns undefined.
success := js.Eval(sbScript.ControlInterface,result.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(sbScript.LastErrorText);
    Exit;
  end;

// We can look at the result, which is "undefined", which is normal and expected.
Memo1.Lines.Add(result.Emit());
// The result JSON is: {"type":"undefined","value":"undefined"}

// The console output is retrieved by calling ConsoleOutputSb
sbOut := TChilkatStringBuilder.Create(Self);
js.ConsoleOutputSb(sbOut.ControlInterface);
Memo1.Lines.Add(sbOut.GetAsString());
end;