Created
August 27, 2017 09:54
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Update the select list field B based on the currently selected option in select list field A. For example, when you select a particular Music Genre only the related Artist should show. Other common use cases/relationships are Company/Contact Info, Country/City, or Brand/Products.
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(function($) { | |
$(function() { | |
// Artist's select option values will depend on | |
// the Genre's selected option. | |
var $genreSelectWidget = $('#id_genre'); | |
var $artistSelectWidget = $('#id_artist'); | |
var artistSelectWidgetInitial = $artistSelectWidget.val() | |
// Adjust Artists based on the selected Genre. | |
function adjustArtistOptions(preSelectedOption) { | |
var selectedGenre = $genreSelectWidget.find(':selected').text(); | |
$.getJSON('/list_artists/?genre=' + selectedGenre, function(data) { | |
var $artistNonEmptyOptions = $artistSelectWidget.find('option:not(:first)'); | |
$artistNonEmptyOptions.remove(); | |
// Rebuild the options. | |
var artistOptions = [] | |
$.each(data, function(dataIndex, artist) { | |
var artistOption = $('<option>', { | |
value: artist.id, | |
text : artist.name | |
}); | |
artistOptions.push(artistOption); | |
}); | |
$artistSelectWidget.append(artistOptions); | |
// Auto-select the option that is previously saved in db, | |
// or the one set as initial value. | |
if (preSelectedOption) { | |
$artistSelectWidget.val(preSelectedOption); | |
} | |
// Optional behavior. | |
// Auto-select the first non-empty option for better UX. | |
else { | |
$artistSelectWidget.find('option:nth-child(2)').prop('selected', true); | |
} | |
}); | |
} | |
// On page load, use the preselected value if there's any. | |
adjustArtistOptions(artistSelectWidgetInitial); | |
// As the user starts interacting with the Genre select list field, | |
// refresh the Artist select list field options accordingly. | |
$genreSelectWidget.change(function() { | |
adjustArtistOptions(); | |
}); | |
}); | |
})(django.jQuery); |
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