Ruby

Call a JavaScript Function Returning an Object

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Demonstrates how to call a JavaScript function that returns an object. Ruby

require 'chilkat'

success = false

# This is the JavaScript function we'll call:

# function getSettings() {
#     return {
#         theme: "dark",
#         notifications: true,
#         version: 1.0
#     };
# }

sbScript = Chilkat::CkStringBuilder.new()
sbScript.Append("function getSettings() {")
sbScript.Append("    return {")
sbScript.Append("        theme: \"dark\",")
sbScript.Append("        notifications: true,")
sbScript.Append("        version: 1.0")
sbScript.Append("    };")
sbScript.Append("}")

js = Chilkat::CkJs.new()

result = Chilkat::CkJsonObject.new()
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() + "\n";

    # Also examine the LastErrorText.
    print js.lastErrorText() + "\n";
    exit
end

# ------------------------------------------------------------------------------
# Call the function getSettings()

funcCall = Chilkat::CkJsonObject.new()

# Create JSON specifying the function name and arguments
# The function has no arguments, so we only specify the name.

# {
#   "name": "getSettings",
# }

funcCall.UpdateString("name","getSettings")

success = js.CallFunction(funcCall,result)
if (success == false)
    # Examine the result for an exception.
    print result.emit() + "\n";

    # Also examine the LastErrorText.
    print js.lastErrorText() + "\n";
    exit
end

print result.emit() + "\n";

# Output:
# {
#   "type": "object",
#   "value": {
#     "theme": "dark",
#     "notifications": true,
#     "version": 1
#   }
# }

# Examine the object's members
print "theme: " + result.stringOf("value.theme") + "\n";
print "notifications: " + result.BoolOf("value.notifications").to_s() + "\n";
print "version: " + result.IntOf("value.version").to_s() + "\n";

# Output:
# theme: dark
# notifications: True
# version: 1