How can I make a class variable global'?

Question

I've following function. I want to return one or more values from select caluse. This function is in a separate javascript file and I want to display returned value across different HTML navigation pages on the app. But how to make those values global?

var UserName;
(function () {
     var service = WinJS.Class.define(function () {
        that = this;
        that.db = null;
        that.path = getFullPath();
       },

 {
        selectUser: function () {
            SQLite3JS.openAsync(that.path)
              .then(function (myDb) {
                  that.db = myDb;
                  console.log("Service opened for select user");
                  return that.db.eachAsync("SELECT * FROM UserValues WHERE userid = 101", function (row) {
                      //console.log("USER : " + row.username + "ID : " + row.userid);
                      //that.username = row.username;
                      userName = row.username;
                      UserName = row.username;
                      //console.log("USER : " + UserName);
                      return UserName;
                  })
              });
        }
    }
}

I used global var. UserName.. it is not working either. I'm creating a static variable inside this selectUser { } , but it is not working either.

---

sonal

Answer 1

var UserName;
(function () {
     var service = WinJS.Class.define(function () {
        that = this;
        that.db = null;
        that.path = getFullPath();
       },

{
        selectUser: function () {
            SQLite3JS.openAsync(that.path)
              .then(function (myDb) {
                  that.db = myDb;
                  console.log("Service opened for select user");
                  return that.db.eachAsync("SELECT * FROM UserValues WHERE userid = 101", function (row) {
                      //console.log("USER : " + row.username + "ID : " + row.userid);
                      //that.username = row.username;
                      userName = row.username;
                      UserName = row.username;
                      //console.log("USER : " + UserName);
                      return UserName;
                  })
              });
        }
    }
}

I want to send username to other pages from this file? I used global var. UserName.. it is not working either. I'm creating a static variable inside this selectUser { } , but it is not working either.

---

sonal

Answer 2

Hi SonalMac,

A really really easy way to do this is to use local/temp object as WinJS.Application list.

--James

---

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Answer 3

I tried using local storage. It does not work either.

In defatult.js,

var

storage = window.localStorage;

storage.username = dbService.selectUser();

   

In home.js,

console.log(storage.username); //shows storage undefined. So I've to declare var storage here again, and it gives storage.username == undefined.

---

sonal

Answer 4

Hi SonalMac,

You could use something as below as we can see from ApplicationData.LocalSettings | localSettings property:

var applicationData = Windows.Storage.ApplicationData.current;

var localSettings = applicationData.localSettings;

// Create a simple setting

localSettings.values["username"] = dbService.selectUser();

// Read data from a simple setting

var value = localSettings.values["username"];
        
if (!value)
{
    // No data
}
else
{
    // Access data in value
}

// Delete a simple setting

localSettings.values.remove("username");

--James

---

<THE CONTENT IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED>
Thanks
MSDN Community Support

Please remember to "Mark as Answer" the responses that resolved your issue. It is a common way to recognize those who have helped you, and makes it easier for other visitors to find the resolution later.