34 lines
967 B
Dart
34 lines
967 B
Dart
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import 'dart:convert';
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import 'dart:io' show Platform;
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import 'package:flutter/foundation.dart';
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import 'package:webview_flutter/webview_flutter.dart';
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/// Evaluates a JavaScript function on the given WebView.
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///
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/// The JavaScript function must return a String.
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///
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/// On Android, the `String` resulted from the evaluation
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/// is JSON parsed. On iOS, the `String` is returned as is.
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///
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/// Other platforms are not supported. The returned value
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/// in this case will be `null`.
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Future<String> wInvoke({
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@required WebViewController webViewController,
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@required String jsFunctionContent,
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bool isFunctionAlready = false
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}) async {
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final actualJS = isFunctionAlready ?
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jsFunctionContent :
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"""
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(() => {
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$jsFunctionContent
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})()
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""";
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final res = await webViewController.evaluateJavascript(actualJS);
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if (Platform.isAndroid) return JsonDecoder().convert(res) as String;
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else if (Platform.isIOS) return res;
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else return null;
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}
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