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Helper I
Helper I

Custom Visual: Using Javascript Promises in Internet Explorer 11

IE 11 still doesn't support ES2015 features like Promises.

 

My default approach here is to use a Polyfill lib, include it in "externalJS" section of pbiviz.json and add "es2015" as lib to tsconfig.json.

 

As a result, the custom visual compiles, but the first use of a Promise results in an error:

new Promise((resolve, reject) => {
    resolve();
});

ERROR TypeError: Erlaubnis verweigert.
Die Eigenschaft "getOwnPropertyNames" eines undefinierten oder Nullverweises kann nicht abgerufen werden.
In english it's probably

ERROR TypeError: Permission denied.
The "getOwnPropertyNames" property of an undefined or null reference can not be retrieved.

 

However, when I write instead

new window["Promise"]((resolve, reject) => {
    resolve();
});

.. it works as expected.

 

What's happening here?

10 REPLIES 10
Community Champion
Community Champion

This issue is related to the fact that Power BI creates a copy of window object to isolate PBI code from Custom Visual's code.

Such solution might produce issues with some native methods and it produces issues with importing external libraries.

 

Meanttime, we're implementing Webpack based PBIVIZ tools to support ES2015 and get rid of this issue by additional code isolation. You can already check it out. It's avaialbe under beta tag on NPM.

 

Ignat Vilesov,

Software Engineer

 

Microsoft Power BI Custom Visuals

pbicvsupport@microsoft.com

Tried the beta version (@2.0.1) of the powerbi-visuals-tools package. Gives me a "Syntax error" in IE11 right away with the sample visual that you get with "pbiviz new". Other browsers work, though.

 

If you say, it's safe to use window["Promise"], then I can work with that.

Community Champion
Community Champion

Yeah, window["Promise"] will probably work well.

 

Ignat Vilesov,

Software Engineer

 

Microsoft Power BI Custom Visuals

pbicvsupport@microsoft.com

Frequent Visitor

Can you please show me the function how to implement?

Replace all "Promise" - calls with "window['Promise']"

 

What exactly do you want to know?

U mean in PowerBi.js replace Promise calls?

In your Custom Visual code, usually all *.ts files.

Community Champion
Community Champion

Have you resolved the issues?

 

Ignat Vilesov,

Software Engineer

 

Microsoft Power BI Custom Visuals

pbicvsupport@microsoft.com

 

 

 

Frequent Visitor

not yet. Below is the function that I have.

 

 

function Print() {
var embedContainer = $('#reportContainer')[0];

// Get a reference to the embedded report.
report = powerbi.get(embedContainer);

// Trigger the print dialog for your browser.
report.print()
.catch(function (errors) {
Console.log(errors);
});
}

Community Champion
Community Champion

Do you still get an error related to Promise?

 

Ignat Vilesov,

Software Engineer

 

Microsoft Power BI Custom Visuals

pbicvsupport@microsoft.com

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