init

_static/admin/js/prepopulate.js

@@ -0,0 +1,43 @@
+/*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);
+            }
+        });
+    };
+}