I am just getting started with TypeScript (and front end development in general) coming from a c# background so sorry if this is a really basic question, but I can't figure out where I'm going wrong...
What I'm trying to do for now is create a really basic program to retrieve some sample data from a url in JSON format, parse to TS classes, and display it on the page.
In order to get the json response I found this answer that recommends using a node package. I got it installed and it seems to be ok (at least TS doesn't give me any errors).
I also figured out that I need to compile (not sure if that's the right term?) with Browserify to make it browser compatible since it's using a node module. I did that but now when I try to run in a browser it's telling me my method is not defined.
export class Keynote {
KeyValue: string;
Description: string;
Parent: string;
}
Retrieval class is:
import {Keynote} from "./Keynote";
import * as request from "request-promise-native";
function GetKeynotes(): Array<Keynote> {
const baseUrl = 'https://revolutiondesign.biz/Sandbox/TypeScript/KeynoteProvider.php';
var options = {uri: baseUrl};
const result = JSON.parse(request.get(options));
return result;
}
and html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Keynotes Testing</title>
<script src="bundle.js"></script>
<script>
function Retrieve() {
var notes = GetKeynotes();
document.getElementById('container').innerText = JSON.stringify(notes);
}
</script>
</head>
<body>
<div>
<button content="Get some notes" onclick="Retrieve()">Get some notes</button>
</div>
<div id="container">
</div>
</body>
</html>
Browserify is really long so I didn't want to copy here but you can see it at https://revolutiondesign.biz/Sandbox/TypeScript/KeynoteDisplay.html in the source if you want.
When I click the button I get this error in the browser:
KeynoteDisplay.html:9 Uncaught ReferenceError: GetKeynotes is not defined
at Retrieve (KeynoteDisplay.html:9)
at HTMLButtonElement.onclick (KeynoteDisplay.html:16)
Retrieve @ KeynoteDisplay.html:9
onclick @ KeynoteDisplay.html:16
GetKeynotes is defined in my typescript, and on the 5th line of bundle.js I see a function with that name... Why is it undefined?
UPDATE
Ok I have played with jspm and SystemJs but I still don't have something right. I referenced the module with jspm and did a bundle to build.js and uploaded the whole thing just to make sure everything is there. Here are the tags in my html for scripts:
<script src="../../jspm_packages/system.js"></script>
<script src="../../config.js"></script>
<script src="build.js"></script>
<script>
System.import("Sandbox/TypeScript/build.js")
function Retrieve() {
System.import("Sandbox/TypeScript/build.js")
var notes = GetKeynotes();
document.getElementById('container').innerText = JSON.stringify(notes);
}
</script>
When I press the button I can debug in my function, but it still gives the error, 'GetKeynotes is not defined' just like before... Again I can see a function with that name in the build.js file so I don't understand why it's not finding it.
I also tried System.import("Sandbox/TypeScript/KeynoteRetrieval.js") but it gives the error:
Uncaught (in promise) Error: (SystemJS) Node tls module not supported in browsers.
Error loading https://revolutiondesign.biz/Sandbox/TypeScript/KeynoteRetrieval.js
