How to store data in phone's memory?

Hi Cameron,

I'm saving this sort of thing locally in a file. Take a look at this API http://docs.phonegap.com/en/1.7.0/cordova_file_file.md.html.

Cheers

John.

Thanks John! Can you offer any tips on how I would implement these functions in the OE mobile app builder?

Hello,

have you tried using a localStorage variable?

There used to be an issue with localStorage and PhoneGap but it should have been fixed.

in the Mobile AppBuilder you can map to a localStorage variable.

Also, you can use ocalStorage from JavaScript.

i hope this helps.

I use localStorage to store transit data where as IP address, user/password, client-principle etc etc goes into a local file. This allows the standard iPhone backup to pick this file up - not so sure on whether localStorage gets backed up. Also, as its my local file I can add encryption where as localStorage is character strings.

Will drop you some examples of both methods in the morning (uk).

cheers

john

LocalStorage issue has been resolved.

Hi,

I am able to use local storage variables or localStorage using JavaScript. What I'm looking to do is save text in a file for the reasons John mentioned. I'll want to encrypt the password and be sure that the data is backed up.

Cheers,

Cameron

Hi John,

Thanks for the tips, any examples you can post would be very helpful.

Cheers,

Cameron

Hi Cameron,

Sorry I didnt get back to you yesterday..... anyhow hope this helps

Cheers

John.

Write file -

function writeFile() {

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

    // Cordova is ready

    //

    function onDeviceReady() {

        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail);

    }

    function gotFS(fileSystem) {

        fileSystem.root.getFile("readme.txt", {create: true, exclusive: false}, gotFileEntry, fail);

    }

    function gotFileEntry(fileEntry) {

        fileEntry.createWriter(gotFileWriter, fail);

    }

    function gotFileWriter(writer) {

        writer.onwriteend = function(evt) {

            alert("contents of file now 'some sample text'");

            writer.truncate(11); 

            writer.onwriteend = function(evt) {

                alert("contents of file now 'some sample'");

                writer.seek(4);

                writer.write(" different text");

                writer.onwriteend = function(evt){

                    alert("contents of file now 'some different text'");

                }

            };

        };

        writer.write("some sample text");

    }

    function fail(error) {

        console.log(error.code);

    }

}

Read file

function readFile() {

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

    // Cordova is ready

    //

    function onDeviceReady() {

        window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, fail);

    }

    function gotFS(fileSystem) {

        fileSystem.root.getFile("readme.txt", null, gotFileEntry, fail);

    }

    function gotFileEntry(fileEntry) {

        fileEntry.file(gotFile, fail);

    }

    function gotFile(file){

        readDataUrl(file);

        readAsText(file);

    }

    function readDataUrl(file) {

        var reader = new FileReader();

        reader.onloadend = function(evt) {

            console.log("Read as data URL");

            console.log(evt.target.result);

        };

        reader.readAsDataURL(file);

    }

    function readAsText(file) {

        var reader = new FileReader();

        reader.onloadend = function(evt) {

            alert("Read as text");

            alert(evt.target.result);

        };

        reader.readAsText(file);

    }

    function fail(evt) {

        console.log(evt.target.error.code);

    }

}

One gotcha - it only works when running as an app installed on the iPhone. I've spent many a happy hour debugging this from a webbrowser .

I havent tried Andriod......

Thanks again John, this has been a great help!

Cheers,

Cameron

Hi all,

Just wanted to let you know we created a KB article in our Support knowledge base so others can benefit of this solution too.

KR article 000041783

Donations to Johns beer fund in Boston this October then?

Sure...