Using a Javascript Function from Typescript

Question

I am trying to build a nice windows phone application with an HTML front end. I want to use TYPESCRIPT to do my processing onto my html page. There is one javascript function which is crucial for my application to work - window.external.notify

This method isn't created till runtime I assume, so I build a javascript wrapper function to determine if it exists when it is called.

if (window.external.notify != undefined)
    window.external.notify(msg);

The issue is I need to get my Typescript files to see this function. I am using Visual Studio 2012 and I have seen the post - How to use an exported function within the local module The issue is when I just include my javascript file with the function I want to use I get the error TS2095.

error TS2095: Build: Could not find symbol

Any ideas or help or possible SDKs to circumvent this issue?

JFAP · Accepted Answer · 2016-08-12 05:44:17Z

8

//notif.js

let notify = function(message) {
    alert(message);
}

//test.ts

declare function notify(message: string): any;
if(notify != undefined)
    notify("your message");

Make sure notif.js is loaded first.

answered Aug 12, 2016 at 5:44

JFAP

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Comments

basarat · Accepted Answer · 2014-02-06 10:19:45Z

6

You need to tell typescript that this function exists on window.external in order to use it. So :

interface External{
    notify: Function;
}

if (window.external.notify != undefined)
    window.external.notify("your message");

edited Feb 6, 2014 at 10:19

answered Feb 4, 2014 at 6:20

basarat

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2 Comments

MrSteamfist Over a year ago

I like that solution, I will check that out when I get home.

jay Over a year ago

it does not work for me as i posted in here: stackoverflow.com/questions/43530096/… can you please give a more complete example? Thanks

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