(CkPython) Call a JavaScript Function Returning a String

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Note: This example requires Chilkat v11.4.0 or greater.

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import sys
import chilkat

success = False

# This is the JavaScript function we'll call:

# function greet(name) {
#     return "Hello, " + name + "!";
# }

sbScript = chilkat.CkStringBuilder()
sbScript.Append("function greet(name) { return \"Hello, \" + name + \"!\"; }")

js = chilkat.CkJs()

result = chilkat.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.
    print(result.emit())

    # Also examine the LastErrorText.
    print(js.lastErrorText())
    sys.exit()

# ------------------------------------------------------------------------------
# Call the function greet("Michael")

funcCall = chilkat.CkJsonObject()

# Create JSON specifying the function name and arguments

# {
#   "name": "greet",
#   "args": [ "Michael" ]
# }

funcCall.UpdateString("name","greet")
funcCall.UpdateString("args[0]","Michael")

success = js.CallFunction(funcCall,result)
if (success == False):
    # Examine the result for an exception.
    print(result.emit())

    # Also examine the LastErrorText.
    print(js.lastErrorText())
    sys.exit()

print(result.emit())

# Output:
# {
#   "type": "string",
#   "value": "Hello, Michael!"
# }

retval = result.stringOf("value")
print(retval)

# Output:
# Hello, Michael!