TEmbeddedWB.ExecScriptEx not working with JavaScript

Question

TEmbeddedWB.ExecScriptEx not working with JavaScript

338 views Asked by user1580348 At 14 September 2024 at 23:43

Put a TMemo, a TEmbeddedWB and a TButton on a Delphi VCL form.

This is the code from the form unit:

procedure TForm1.Button1Click(Sender: TObject);
var
  vResult: OleVariant;
  Para1: string;
begin
  Para1 := '5'; // edPara.Text;
  vResult := EmbeddedWB1.ExecScriptEx('evaluate', [Para1]);
  ShowMessage('Result from the Script: ' + IntToStr(vResult));
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  EmbeddedWB1.HTMLCode.Assign(Memo1.Lines);
end;

This is the content of the Memo1.Lines:

<HTML> 
<HEAD> 
<TITLE>Test Script</TITLE> 
<SCRIPT> 
  function evaluate(x) { alert("Hello from the script evaluate(x)"); return eval(x * x); } 
</SCRIPT> 
</HEAD> 
<BODY> TEST Script: eval(x * x)</BODY> 
</HTML>

But it does not work: vResult is 0 after clicking the button.

Why it does not work?

Original Q&A

There are 1 answers

**user1580348** · Accepted Answer · 2015-08-22 15:02:34

The parameter type passed to ExecScriptEx must be an Integer in this case, not a string:

procedure TForm1.Button1Click(Sender: TObject);
var
  vResult: OleVariant;
  Para1: string;
  ParaInt: Integer;
begin
  //Para1 := '5'; // edPara.Text;
  ParaInt := 5;
  vResult := EmbeddedWB1.ExecScriptEx('evaluate', [ParaInt]);
  ShowMessage('Result from the Script: ' + IntToStr(vResult));
end;

Now it works!

TechQA.

TEmbeddedWB.ExecScriptEx not working with JavaScript

There are 1 answers

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