Chilkat2-Python

Call a JavaScript Function Returning a String

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Demonstrates how to call a JavaScript function that returns a string. Chilkat2-Python

import sys
import chilkat2

success = False

# This is the JavaScript function we'll call:

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

sbScript = chilkat2.StringBuilder()
sbScript.Append("function greet(name) { return \"Hello, \" + name + \"!\"; }")

js = chilkat2.Js()

result = chilkat2.JsonObject()
result.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 = chilkat2.JsonObject()

# 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!