silverstripe-cms/client/src/legacy/SiteTreeURLSegmentField.js

import $ from 'jquery';

$.entwine('ss', function($) {
	/**
	 * Class: .field.urlsegment
	 *
	 * Provides enhanced functionality (read-only/edit switch) and
	 * input validation on the URLSegment field
	 */
	$('.field.urlsegment:not(.readonly)').entwine({

		// Roughly matches the field width including edit button
		MaxPreviewLength: 55,

		Ellipsis: '...',

		onmatch : function() {
			// Only initialize the field if it contains an editable field.
			// This ensures we don't get bogus previews on readonly fields.
			if(this.find(':text').length) this.toggleEdit(false);
			this.redraw();

			this._super();
		},

		redraw: function() {
			var field = this.find(':text'),
				url = decodeURI(field.data('prefix') + field.val()),
				previewUrl = url;

			// Truncate URL if required (ignoring the suffix, retaining the full value)
			if(url.length > this.getMaxPreviewLength()) {
				previewUrl = this.getEllipsis() + url.substr(url.length - this.getMaxPreviewLength(), url.length);
			}

			// Transfer current value to holder
			this.find('.URL-link').attr('href', encodeURI(url + field.data('suffix'))).text(previewUrl);
		},

		/**
		 * @param Boolean
		 */
		toggleEdit: function(toggle) {
			var field = this.find(':text');

			this.find('.preview-holder')[toggle ? 'hide' : 'show']();
			this.find('.edit-holder')[toggle ? 'show' : 'hide']();

			if(toggle) {
				field.data("origval", field.val()); //retain current value for cancel
				field.focus();
			}
		},

		/**
		 * Commits the change of the URLSegment to the field
		 * Optional: pass in (String) to update the URLSegment
		 */
		update: function() {
			var self = this,
				field = this.find(':text'),
				currentVal = field.data('origval'),
				title = arguments[0],
				updateVal = (title && title !== "") ? title : field.val();

			if (currentVal != updateVal) {
				this.addClass('loading');
				this.suggest(updateVal, function(data) {
					field.val(decodeURIComponent(data.value));
					self.toggleEdit(false);
					self.removeClass('loading');
					self.redraw();
				});
			} else {
				this.toggleEdit(false);
				this.redraw();
			}
		},

		/**
		 * Cancels any changes to the field
		 */
		cancel: function() {
			var field = this.find(':text');
			field.val(field.data("origval"));
			this.toggleEdit(false);
		},

		/**
		 * Return a value matching the criteria.
		 *
		 * @param (String)
		 * @param (Function)
		 */
		suggest: function(val, callback) {
			var self = this,
				field = self.find(':text'),
				urlParts = $.path.parseUrl(self.closest('form').attr('action')),
				url = urlParts.hrefNoSearch + '/field/' + field.attr('name') + '/suggest/?value=' + encodeURIComponent(val);
			if(urlParts.search) url += '&' + urlParts.search.replace(/^\?/, '');

			$.ajax({
				url: url,
				success: function(data) {
					callback.apply(this, arguments);
				},
				error: function(xhr, status) {
					xhr.statusText = xhr.responseText;
				},
				complete: function() {
					self.removeClass('loading');
				}
			});
		}
	});

	$('.field.urlsegment .edit').entwine({
		onclick: function(e) {
			e.preventDefault();
			this.closest('.field').toggleEdit(true);
		}
	});

	$('.field.urlsegment .update').entwine({
		onclick: function(e) {
			e.preventDefault();
			this.closest('.field').update();
		}
	});

	$('.field.urlsegment .cancel').entwine({
		onclick: function(e) {
			e.preventDefault();
			this.closest('.field').cancel();
		}
	});
});