prepopulate.js
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prepopulate.js
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			/global URLify/
			'use strict';
			{
			const $ = django.jQuery;
			$.fn.prepopulate = function(dependencies, maxLength, allowUnicode) {
			/*
			Depends on urlify.js
			Populates a selected field with the values of the dependent fields,
			URLifies and shortens the string.
			dependencies - array of dependent fields ids
			maxLength - maximum length of the URLify'd string
			allowUnicode - Unicode support of the URLify'd string
			*/
			return this.each(function() {
			const prepopulatedField = $(this);

			const populate = function() {
			// Bail if the field's value has been changed by the user
			if (prepopulatedField.data('_changed')) {
			return;
			}

			const values = [];
			$.each(dependencies, function(i, field) {
			field = $(field);
			if (field.val().length > 0) {
			values.push(field.val());
			}
			});
			prepopulatedField.val(URLify(values.join(' '), maxLength, allowUnicode));
			};

			prepopulatedField.data('_changed', false);
			prepopulatedField.on('change', function() {
			prepopulatedField.data('_changed', true);
			});

			if (!prepopulatedField.val()) {
			$(dependencies.join(',')).on('keyup change focus', populate);
			}
			});
			};
			}