CkPython Requires Chilkat v11.4.0+

Call a JavaScript Function Returning a String

See more JavaScript Examples

Demonstrates how to call a JavaScript function that returns a string. CkPython

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!