How to Set the Local Storage Before a Uiwebview Loading Its Initial Request

Is there a way to set local storage in WKWebView

From @paulvs comment here is what I do.

Set navigation delegate to listen to finished callback.

webView.navigationDelegate = self

Then in the callback, check for value in localStorage and set if needed.

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {

    webView.evaluateJavaScript("localStorage.getItem(\"key\")") { (result, error) in

        // check if result is what I want
        // if it is what I want, do nothing
        // if not set it
        webView.evaluateJavaScript("localStorage.setItem(\"key\", \"value\")") { (result, error) in

            webView.reload()

        }            
    }
}

How do I get HTML5 localstorage data to the native code by cordova on ios?

yes it works on ios in javascript, to get the value :

window.localStorage.getItem("test"); 

more from cordova docs https://cordova.apache.org/docs/fr/latest/cordova/storage/localstorage/localstorage.html :

   document.addEventListener("deviceready", onDeviceReady, false);

    // device APIs are available
    //
    function onDeviceReady() {
        window.localStorage.setItem("key", "value");
        var keyname = window.localStorage.key(i);
        // keyname is now equal to "key"
        var value = window.localStorage.getItem("key");
        // value is now equal to "value"
        window.localStorage.removeItem("key");
        window.localStorage.setItem("key2", "value2");
        window.localStorage.clear();
        // localStorage is now empty
    }

to read :

https://github.com/react-native-community/react-native-webview/issues/73

How to set the local storage before a UIWebView loading its initial request?

Read local storage data using WKWebView

You need to inject this script when the website has already loaded:

• your WKWebView needs to assign the navigationDelegate

  webView.navigationDelegate = self

• inject the script when the website was loaded completely

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
    
    //you might want to edit the script, with the escape characters
    let script = "localStorage.getItem(\"token\")"
    wkWebView.evaluateJavaScript(script) { (token, error) in
        if let error = error {
            print ("localStorage.getitem('token') failed due to \(error)")
            assertionFailure()
        }
        print("token = \(token)")
    }
}

How do I enable Local Storage in my WebKit-based application?

I submitted an app using this code to the Mac App Store, and Apple approved it:

Objective-C

WebPreferences* prefs = [webView preferences];
[prefs _setLocalStorageDatabasePath:@"~/Library/Application Support/MyApp"];
[prefs setLocalStorageEnabled:YES];

Swift 3

var prefs: WebPreferences? = webView.preferences
prefs?._setLocalStorageDatabasePath("~/Library/Application Support/MyApp")
prefs?.localStorageEnabled = true

Whether they will continue to approve that, I don't know, but they allowed it for my application as of 2011-01-29. Update: They also approved a version update to the same app, so it has gone through twice.

Loading HTML5 containing SVG in UIWebView whilst keeping localStorage available

I felt reinvigorated today, in large part thanks to @JimDusseau providing a novel attempt to solve the problem (I must confess I'd given up on getting this to work.) Unfortunately, Jim's approach works for the request, but it still had no effect on the response.

I then Googled for 2 hours trying to find other options, one of which was trying to associate a mime type with particular file extensions, etc.

All of this Googling proved fruitless, but it did trigger a vague memory of another file extension...

.xhtml

Could using this file extension cause the request to be handled with the appropriate mime type? My heart started pounding, I could feel the blood coursing through my veins, and, with great anticipation, I made the edit and rebuilt the project to find that [drumroll]...

YES! YES! YES! The iphone treats the response with the appropriate mime type AND keeps the document origin happy for localStorage.

Here's the working code:

NSString *filePath = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"xhtml"];
NSURL *baseURL = [NSURL fileURLWithPath:filePath];
NSURLRequest *request = [NSURLRequest requestWithURL:baseURL];
[webView loadRequest:request];

Simple, yet elusive (until now.)

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