(JavaScript) Firebase GET - Reading Data

Demonstrates how to read parts of a Firebase JSON database. The data used in this example is at Chilkat Firebase Pigs Database, and is shown here:

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

// Demonstrates how to read parts of a Firebase JSON database.

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// This example assumes a JWT authentication token, if required, has been previously obtained.
// See Get Firebase Access Token from JSON Service Account Private Key for sample code.

// Load the previously obtained Firebase access token into a string.
var fac = new CkFileAccess();
var accessToken = fac.ReadEntireTextFile("qa_data/tokens/firebaseToken.txt","utf-8");
if (fac.LastMethodSuccess !== true) {
    console.log(fac.LastErrorText);
    return;
}

var rest = new CkRest();

// Make the initial connection (without sending a request yet).
// Once connected, any number of requests may be sent.  It is not necessary to explicitly
// call Connect before each request.  
success = rest.Connect("chilkat.firebaseio.com",443,true,true);
if (success !== true) {
    console.log(rest.LastErrorText);
    return;
}

// If authentication is required...
var authGoogle = new CkAuthGoogle();
authGoogle.AccessToken = accessToken;
rest.SetAuthGoogle(authGoogle);

// Chilkat's sample data (pig-rescue data) is publicly readable at: https://chilkat.firebaseio.com/.json

// Let's get the animals with the shallow parameter so we can see how many pigs exist.
var jsonResponse = rest.FullRequestNoBody("GET","/pig-rescue/animal.json?shallow=true");
if (rest.LastMethodSuccess !== true) {
    console.log(rest.LastErrorText);
    return;
}

// The JSON returned should look like this:  
// {"-KI3bD-FU_Dake7sYOiP":true,"-KI3bD-FU_Dake7sYOiT":true,"-KI3bD-FU_Dake7sYOiS":true,"-KI3bD-FU_Dake7sYOiU":true,"-KI3bD-FU_Dake7sYOiV":true,"-KI3bD-FU_Dake7sYOiR":true,"-KI3bD-FU_Dake7sYOiQ":true}
console.log(jsonResponse);

// Parse the response so we can iterate over each pig in the database..
var piggyPath = new CkStringBuilder();
var shallow = new CkJsonObject();
var piggyData = new CkJsonObject();
shallow.Load(jsonResponse);
var count = shallow.Size;
var i = 0;
while (i < count) {

    // Get each individual pig's data.
    piggyPath.Clear();
    piggyPath.Append("/pig-rescue/animal/");
    piggyPath.Append(shallow.NameAt(i));
    piggyPath.Append("/.json");

    var piggyJson = rest.FullRequestNoBody("GET",piggyPath.GetAsString());
    if (rest.LastMethodSuccess !== true) {
        console.log(rest.LastErrorText);
        return;
    }

    // Show this piggy's data...
    // An example of one pig's data is shown here:
    // {"birth":"February, 1998","from":"Middle Ave.","gender":"F","in-date":"January, 2000",
    //   "name":"Molly II","picture":{"caption":"Molly in the Pasture","description":"Black pig","file":"molly_th.jpg"},
    //   "species":"pot belly pig","type":"Cathy's Herd"}
    console.log("---- " + i + " ----");
    console.log(piggyJson);

    // Let's get the pig's name, and the caption of the picture.
    piggyData.Load(piggyJson);
    console.log("name: " + piggyData.StringOf("name"));
    console.log("caption: " + piggyData.StringOf("picture.caption"));

    i = i+1;
}

// Note: In many of the Chilkat examples, you may notice strange ways
// of doing something that should be simpler and shorter.  For example,
// building the piggyPath (above) could've been written differently,
// with some simple string concatenation.
// 
// The reason is that the Chilkat examples are written in a 
// proprietary "example code" scripting language,
// and then automatically generated to each of the different programming
// languages you see on example-code.com.  The code generation is
// limited in what it can do.  For example, string concatentation
// is not yet a feature of the "example code" scripting language (as of May 2016), 
// and therefore you won't see the use of a programming language's string
// concatentation operators in any example.  
//