util.JSONObject.getKey()
util.JSONObject.getKey() returns the key of the key:value pair by its index.
Syntax
CALL util.JSONObject.getKey(pair_index)
Parameters
|
pair_index |
an index of the element of the JSON object (= the key:value pair) |
Usage and examples
util.JSONObject.key() takes the pair index in the JSON object as the parameter and returns the key.
The index of the first key:value pair is 1.
If the JSON object included no pair with the specified name, the method returns NULL.
MAIN
DEFINE json_obj util.JSONObject
LET json_obj=util.JSONObject.parse('{"id":123, "name":"Scott", "surname":"Smith"}')
DISPLAY json_obj.getKey(1)
DISPLAY json_obj.getKey(2)
DISPLAY json_obj.getKey(3)
CALL fgl_getkey()
END MAIN
This method can be used together with util.JSONObject.getLength() and util.JSONObject.getType() in order to read the elements of JSON objects:
MAIN
DEFINE json_obj util.JSONObject
DEFINE i INTEGER
LET json_obj=util.JSONObject.parse('{"id":12, "name":"Scott,
Frank", "address":"5 Brando Str."}')
FOR i=1 TO json_obj.getLength()
DISPLAY i,":
",json_obj.name(i),"=",json_obj.get(json_obj.name(i))
END FOR
CALL fgl_getkey()
END MAIN
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