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;
        }
  }
}