GetJSON: Difference between revisions
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''url'' is the location that data is being requested from. | ''url'' is the location that data is being requested from. | ||
''data'' is the information about the request. If multiple fields are being passed, include them in a single string, separated by ampersand (&) characters. It's best to do an | ''data'' is the information about the request. If multiple fields are being passed, include them in a single string, separated by ampersand (&) characters. It's best to do an [[EncodeURIComponent/decodeURIComponent|encodeURIComponent]]() to the data to make sure that spaces and other special characters are properly formatted. | ||
''callback'' is the name of the function in your program to be called when the request is complete. Since the request may take a little while to complete, your app will continue execution immediately after the getJSONP() function is called. The results will not be available until the ''callback'' function is called. The returned data is passed to the ''callback'' function. | ''callback'' is the name of the function in your program to be called when the request is complete. Since the request may take a little while to complete, your app will continue execution immediately after the getJSONP() function is called. The results will not be available until the ''callback'' function is called. The returned data is passed to the ''callback'' function. | ||
Revision as of 15:36, 15 January 2014
getJSONP(url,data,callback)
Description
getJSONP loads JSON-encoded data from the server using a GET HTTP request.
url is the location that data is being requested from.
data is the information about the request. If multiple fields are being passed, include them in a single string, separated by ampersand (&) characters. It's best to do an encodeURIComponent() to the data to make sure that spaces and other special characters are properly formatted.
callback is the name of the function in your program to be called when the request is complete. Since the request may take a little while to complete, your app will continue execution immediately after the getJSONP() function is called. The results will not be available until the callback function is called. The returned data is passed to the callback function.
Example
Function btnLoad_onclick()
Dim city = encodeURIComponent(txtCity.value)
GetJSONP("http://api.openweathermap.org/data/2.5/weather","q=" & city, weatherData)
End Function
Sub weatherData(data)
MsgBox "Temperature is " & data.main.temp - 273.15
End Sub