UniPanel's snapshot problem

[55143681]

I can use js to snapshot uniPanel to a image,

and my test demo works well,

but when I add the code to my project,

that do not work,

what 's the problem maybe?

The demo is:

1.add files/html2canvas.min.js to UniServerModule->CustomFiles

2.add code to MainForm->Script

function canvasSaveAs(uri, filename) {

    var link = document.createElement('a');

    if (typeof link.download === 'string') {

        link.href = uri;

        link.download = filename;

        document.body.appendChild(link);

        link.click();

        document.body.removeChild(link);

    } else {

        window.open(uri);

    }

}

3.add Unibutton click event

 

void __fastcall TMainForm::UniButton1Click(TObject *Sender)

{

String   fName;

fName = "capture" + FormatDateTime("yyyyMMddhhnnss", Now());

UniPanel1->JSInterface->JSCode(

         "html2canvas(document.querySelector(\"#"+ UniPanel1->JSId +"\")).then(function(canvas) {"

         +"   canvasSaveAs(canvas.toDataURL(), \""+ fName +"\");"

         +    "});"

         );

 

}

html2canvas.min.js