CkPython Requires Chilkat v11.4.0+

Call a JavaScript Function Returning a Boolean

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

import sys
import chilkat

success = False

#  This is the JavaScript function we'll call:

#  function isEven(number) {
#      return number % 2 === 0;
#  }

sbScript = chilkat.CkStringBuilder()
sbScript.Append("function isEven(number) { return number % 2 === 0; }")

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 isEven(8)

funcCall = chilkat.CkJsonObject()

#  Create JSON specifying the function name and arguments

#  {
#    "name": "isEven",
#    "args": [ 8 ]
#  }

funcCall.UpdateString("name","isEven")
funcCall.UpdateInt("args[0]",8)

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": "bool",
#    "value": true
#  }

retval = result.BoolOf("value")
print(str(retval))

#  Output:
#  True