iOS WKWebView Swift javascript enable

Question

I'm trying to develop a simple app to browse my website. However my website contains some javascript and it doesn't successfully show my website.

In the past develop with android the same app and had to activate like this:

webSettings.setJavaScriptEnabled(true);

This currently my code I just have missing the option to enable javascript if somebody can help will really appreciate

import WebKit

class ViewController: UIViewController {

  @IBOutlet weak var webView: WKWebView!

  override func viewDidLoad() {
    super.viewDidLoad()
    let url = URL(string: "http://132.148.136.31:8082")
    let urlRequest = URLRequest(url: url!)

    webView.load(urlRequest)
  }
}

Solution 1

Working with WKWebView is better to create it from code. And you can set javaScriptEnabled to configuration:

let preferences = WKPreferences()
preferences.javaScriptEnabled = true
let configuration = WKWebViewConfiguration()
configuration.preferences = preferences
let webview = WKWebView(frame: .zero, configuration: configuration)

Update. This is WKWebView in view controller class:

import UIKit
import WebKit

class ViewController: UIViewController {

    private var webView: WKWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let preferences = WKPreferences()
        preferences.javaScriptEnabled = true
        let configuration = WKWebViewConfiguration()
        configuration.preferences = preferences
        webView = WKWebView(frame: view.bounds, configuration: configuration)
        view.addSubview(webView)
    }
}

Solution 2

For those who are building for iOS 14 with Swift 5 and Xcode 12, it has changed to the following ...

webView.configuration.defaultWebpagePreferences.allowsContentJavaScript = true

Solution 3

You are using WKWebView storyboard view so you can directly access the configuration. So use preferences under your WKWebView configuration.

import WebKit

class ViewController: UIViewController {

  @IBOutlet weak var webView: WKWebView!

  override func viewDidLoad() {
    super.viewDidLoad()
    let url = URL(string: "http://132.148.136.31:8082")
    let urlRequest = URLRequest(url: url!)

    // enable JS
    webView.configuration.preferences.javaScriptEnabled = true
    webView.load(urlRequest)
  }
}

Solution 4

The above answer is right you need to set this value as true to enable JavaScript.

webView.configuration.preferences.javaScriptEnabled = true

But if the JS scripts are from a non-HTTPS source then you need to allow "App Transport Security's Arbitrary Loads".

Here is how to fix that:

1. Navigate to Project Settings/Target/[your app's target]/Info.
2. Check whether there is a dictionary called App Transport Security Settings. If not, create it.
3. Inside it, create a boolean value called Allow Arbitrary Loads (if it's not there yet) and set it to YES.

View more solutions

Comments

[lusito92]

how do you implement this? I get so many errors If I do it in the view controller class

[Andrew Bogaevskyi]

@lusito92 I've updated my answer. It works well for me (Xcode 9.0.1, Swift 4). What errors do you have?

[lusito92]

I updated but still not working javascript look on the top the update please let me know really appreciate

[Andrew Bogaevskyi]

@lusito92 I've double checked it with google.com. It works! with .javaScriptEnabled = true I can open side bar, and if false - I cant. Are you sure that JavaScript works on your page by URl 132.148.136.31:8082 ? Did you try it in Safari? You also could debug you webview with a connected device in Safari on mac.

[Abirami Bala]

It doesn't work for me. there is a function to show an auto fill drop down when clicking a button/ textfield in a webview. and which is working fine on android after enabling the javascript. but it doesn't work for me even if i enable the javascript as per your code above. Any solution..? would be appreciated. Thanks..!

[Heitor]

Much cleaner syntax!

[Ruchira More]

@Md Imran Choudhury how I can check that my JS is loaded successfully.

[Md Imran Choudhury]

You can set any JS action to your website to check.

[Ruchira More]

Yes I have written JS function to display and evaluated in my swift class it is working. But in my case javascript is not calling is this because of script path which we are setting in HTML ? Is it because of JS interface not calling?

[Ruchira More]

@MdImranChoudhury when I injected my script into my WKWebview then only I am able to display "JS Alert" after loading HTML. Resolved issue!

[Siempay]

this did not work for me, it still shows that js is disabled in my browser (webview)

[kasoft]

'javaScriptEnabled' was deprecated in iOS 14.0: Use WKWebPagePreferences.allowsContentJavaScript to disable content JavaScript on a per-navigation basis