Lab Session: Saving data to localStorage: Difference between revisions
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# Modify ''Sub Main'' to check ''localStorage'' for an element called ''weatherSaves''. If it does not exist, initialize it to an empty array. Remove the ''lstSaves'' initialization code. | # Modify ''Sub Main'' to check ''localStorage'' for an element called ''weatherSaves''. If it does not exist, initialize it to an empty array. Remove the ''lstSaves'' initialization code. | ||
# Modify the click code for ''btnSave'' so that it adds a new entry to the ''weatherSaves'' array of ''localStorage''. The entry should be an object containing all the weather data including the current date. | # Modify the click code for ''btnSave'' so that it adds a new entry to the ''weatherSaves'' array of ''localStorage''. The entry should be an object containing all the weather data including the current date. | ||
# Add | # Add an onshow event for ''frmSaves'' that initializes ''lstSaves'' with the entries from the ''weatherSaves'' array. | ||
# Add a click event to ''lstSaves'' that retrieves the proper entry from ''weatherSaves'' when clicked, sets the proper values in ''frmSavedData'' and displays it. | # Add a click event to ''lstSaves'' that retrieves the proper entry from ''weatherSaves'' when clicked, sets the proper values in ''frmSavedData'', and displays it. | ||
Latest revision as of 06:24, 7 January 2014
In this lab you will modify your app so you can save historical weather data in localStorage.
Student Outline
- Open LabLocalStorage.nsx.
- Modify Sub Main to check localStorage for an element called weatherSaves. If it does not exist, initialize it to an empty array. Remove the lstSaves initialization code.
- Modify the click code for btnSave so that it adds a new entry to the weatherSaves array of localStorage. The entry should be an object containing all the weather data including the current date.
- Add an onshow event for frmSaves that initializes lstSaves with the entries from the weatherSaves array.
- Add a click event to lstSaves that retrieves the proper entry from weatherSaves when clicked, sets the proper values in frmSavedData, and displays it.