Ruby

Call a JavaScript Function Returning an Array

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

require 'chilkat'

success = false

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

sbScript = Chilkat::CkStringBuilder.new()
success = sbScript.LoadFile("js_function_returning_array.js","utf-8")
if (success == false)
    print sbScript.lastErrorText() + "\n";
    exit
end

js = Chilkat::CkJs.new()

result = Chilkat::CkJsonObject.new()
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.
    print result.emit() + "\n";

    #  Also examine the LastErrorText.
    print js.lastErrorText() + "\n";
    exit
end

#  ------------------------------------------------------------------------------
#  Call each function

funcCall = Chilkat::CkJsonObject.new()

#  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.
    print result.emit() + "\n";

    #  Also examine the LastErrorText.
    print js.lastErrorText() + "\n";
    exit
end

print result.emit() + "\n";

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

#  Access each array value..
count = result.SizeOfArray("value")
i = 0
while i < count
    result.put_I(i)
    print result.stringOf("value[i]") + "\n";
    i = i + 1
end

#  ------------------------------------------------------------------------------
#  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)
print result.emit() + "\n";

#  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)
    print result.IntOf("value[i]").to_s() + "\n";
    i = i + 1
end

#  ------------------------------------------------------------------------------
#  Call the getEmployees() function

funcCall.Clear()
funcCall.UpdateString("name","getEmployees")
success = js.CallFunction(funcCall,result)
print result.emit() + "\n";

#  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)
    print "name: " + result.stringOf("value[i].name") + "\n";
    print "role: " + result.stringOf("value[i].role") + "\n";
    print "id: " + result.IntOf("value[i].id").to_s() + "\n";
    print "" + "\n";
    i = i + 1
end

JavaScript

function getDays() {
    return ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"];
}

function getRange(start, end) {
    var arr = [];
    for (var i = start; i <= end; i++) {
        arr.push(i);
    }
    return arr;
}
// Usage: getRange(1, 5) -> [1, 2, 3, 4, 5]

function getEmployees() {
    return [
        { id: 101, name: "Alice", role: "Dev" },
        { id: 102, name: "Bob", role: "Manager" }
    ];
}