Java

Call a JavaScript Function Returning an Array

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Demonstrates how to call a JavaScript function that returns an array. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  ----------------------------------------------------------------------------------
    //  The Javascript functions called in this example are shown at the bottom of this page.
    //  -----------------------------------------------------------------------------------

    CkStringBuilder sbScript = new CkStringBuilder();
    success = sbScript.LoadFile("js_function_returning_array.js","utf-8");
    if (success == false) {
        System.out.println(sbScript.lastErrorText());
        return;
        }

    CkJs js = new CkJs();

    CkJsonObject result = new CkJsonObject();
    result.put_EmitCompact(false);

    //  Call Eval to add the function to the context's global object
    success = js.Eval(sbScript,result);
    if (success == false) {
        //  Examine the result for an exception.
        System.out.println(result.emit());

        //  Also examine the LastErrorText.
        System.out.println(js.lastErrorText());
        return;
        }

    //  ------------------------------------------------------------------------------
    //  Call each function

    CkJsonObject funcCall = new CkJsonObject();

    //  Create JSON specifying the function name and arguments
    //  The function has no arguments, so we only specify the name.

    funcCall.UpdateString("name","getDays");

    success = js.CallFunction(funcCall,result);
    if (success == false) {
        //  Examine the result for an exception.
        System.out.println(result.emit());

        //  Also examine the LastErrorText.
        System.out.println(js.lastErrorText());
        return;
        }

    System.out.println(result.emit());

    //  Output:
    //  {
    //    "type": "array",
    //    "value": [
    //      "Monday",
    //      "Tuesday",
    //      "Wednesday",
    //      "Thursday",
    //      "Friday"
    //    ]
    //  }

    //  Access each array value..
    int count = result.SizeOfArray("value");
    int i = 0;
    while (i < count) {
        result.put_I(i);
        System.out.println(result.stringOf("value[i]"));
        i = i+1;
        }

    //  ------------------------------------------------------------------------------
    //  Call the getRange(start,end) function

    funcCall.Clear();
    funcCall.UpdateString("name","getRange");
    funcCall.UpdateInt("args[0]",14);
    funcCall.UpdateInt("args[1]",21);
    success = js.CallFunction(funcCall,result);
    System.out.println(result.emit());

    //  Output:
    //  {
    //    "type": "array",
    //    "value": [
    //      14,
    //      15,
    //      16,
    //      17,
    //      18,
    //      19,
    //      20,
    //      21
    //    ]
    //  }

    count = result.SizeOfArray("value");
    i = 0;
    while (i < count) {
        result.put_I(i);
        System.out.println(result.IntOf("value[i]"));
        i = i+1;
        }

    //  ------------------------------------------------------------------------------
    //  Call the getEmployees() function

    funcCall.Clear();
    funcCall.UpdateString("name","getEmployees");
    success = js.CallFunction(funcCall,result);
    System.out.println(result.emit());

    //  Output:
    //  {
    //    "type": "array",
    //    "value": [
    //      {
    //        "id": 101,
    //        "name": "Alice",
    //        "role": "Dev"
    //      },
    //      {
    //        "id": 102,
    //        "name": "Bob",
    //        "role": "Manager"
    //      }
    //    ]
    //  }

    count = result.SizeOfArray("value");
    i = 0;
    while (i < count) {
        result.put_I(i);
        System.out.println("name: " + result.stringOf("value[i].name"));
        System.out.println("role: " + result.stringOf("value[i].role"));
        System.out.println("id: " + result.IntOf("value[i].id"));
        System.out.println("");
        i = i+1;
        }
  }
}