Perl

Call a JavaScript Function Passing an Array Argument

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Demonstrates how to call a JavaScript function with an argument that is an array. Perl

use chilkat();

$success = 0;

# This is the JavaScript function we'll call:

# function calculateTotal(numbers) {
#   console.log(numbers);
#   let total = 0;
#   
#   // Loop through every number in the array
#   for (const num of numbers) {
#     console.log(num);
#     total += num;
#   }
#   
#   return total;
# }

$sbScript = chilkat::CkStringBuilder->new();
$success = $sbScript->LoadFile("js_function_array_arg.js","utf-8");
if ($success == 0) {
    print $sbScript->lastErrorText() . "\r\n";
    exit;
}

$js = chilkat::CkJs->new();

$result = chilkat::CkJsonObject->new();
$result->put_EmitCompact(0);

# Call Eval to add the function to the context's global object
$success = $js->Eval($sbScript,$result);
if ($success == 0) {
    # Examine the result for an exception.
    print $result->emit() . "\r\n";

    # Also examine the LastErrorText.
    print $js->lastErrorText() . "\r\n";
    exit;
}

# ------------------------------------------------------------------------------
# Call the function calculateTotal(numbers)

$funcCall = chilkat::CkJsonObject->new();
$funcCall->put_EmitCompact(0);

# Create JSON specifying the function name and arguments
# In this case, there is only 1 argument, and it is an array.

$funcCall->UpdateString("name","calculateTotal");

# Create the arguments array.
$argsArray = chilkat::CkJsonArray->new();

# The 1st argument in the arguments array is itself an array.
# Passing -1 indicates to append to the array.
$arg = chilkat::CkJsonArray->new();
$argsArray->AddArrayAt2(-1,$arg);

# Fill in the values for the 1st argument.
$arg->AddNumberAt(-1,"10.50");
$arg->AddNumberAt(-1,"20.00");
$arg->AddNumberAt(-1,"5.25");

# Add the "args" array to the funcCall.
$funcCall->AppendArrayCopy("args",$argsArray);

print $funcCall->emit() . "\r\n";

# The funcCall is as follows.  Notice that the 1st (and only) argument is an array.

# {
#   "name": "calculateTotal",
#   "args": [
#     [
#       10.50,
#       20.00,
#       5.25
#     ]
#   ]
# }

$success = $js->CallFunction($funcCall,$result);
if ($success == 0) {
    # Examine the result for an exception.
    print $result->emit() . "\r\n";

    # Also examine the LastErrorText.
    print $js->lastErrorText() . "\r\n";
    exit;
}

print $result->emit() . "\r\n";

# Result:
# {
#   "type": "double",
#   "value": 35.75
# }

# The function also emitted text to the console.

$sbOut = chilkat::CkStringBuilder->new();
$js->ConsoleOutputSb($sbOut);
print $sbOut->getAsString() . "\r\n";

# Output:
# 10.5,20,5.25
# 10.5
# 20
# 5.25

# -----------------------------------------------------------
# Note: If the array argument is simple, this is an alternative
# and simpler way of creating the funcCall:

$funcCall->Clear();
$funcCall->UpdateString("name","calculateTotal");
$funcCall->UpdateNumber("args[0][0]","10.50");
$funcCall->UpdateNumber("args[0][1]","20.00");
$funcCall->UpdateNumber("args[0][2]","5.25");
print $funcCall->emit() . "\r\n";