X-Git-Url: https://git.mdrn.pl/redakcja.git/blobdiff_plain/05a64b9314fac5f613133332d7d0b5b568ab8afc..e0f595e44766e352edfce0aaf5d32be57f448882:/src/redakcja/static/js/wiki/wikiapi.js?ds=inline

diff --git a/src/redakcja/static/js/wiki/wikiapi.js b/src/redakcja/static/js/wiki/wikiapi.js
index 2f1bceb5..14b8337e 100644
--- a/src/redakcja/static/js/wiki/wikiapi.js
+++ b/src/redakcja/static/js/wiki/wikiapi.js
@@ -1,449 +1,533 @@
 (function($) {
-	$.wikiapi = {};
-	var noop = function() {
-	};
-	var noops = {
-		success: noop,
-		failure: noop
-	};
-	/*
-	 * Return absolute reverse path of given named view. (at least he have it
-	 * hard-coded in one place)
-	 *
-	 * TODO: think of a way, not to hard-code it here ;)
-	 *
-	 */
-	function reverse() {
-		var vname = arguments[0];
-		var base_path = "/editor";
-
-		if (vname == "ajax_document_text") {
-			var path = "/text/" + arguments[1] + '/';
-
-		if (arguments[2] !== undefined)
-				path += arguments[2] + '/';
-
-			return base_path + path;
-		}
+    $.wikiapi = {};
+    var noop = function() {
+    };
+    var noops = {
+	success: noop,
+	failure: noop
+    };
+    /*
+     * Return absolute reverse path of given named view. (at least he have it
+     * hard-coded in one place)
+     *
+     * TODO: think of a way, not to hard-code it here ;)
+     *
+     */
+    function reverse() {
+	var vname = arguments[0];
+	var base_path = "/editor";
+
+	if (vname == "ajax_document_text") {
+	    var path = "/text/" + arguments[1] + '/';
+
+	    if (arguments[2] !== undefined)
+		path += arguments[2] + '/';
+
+	    return base_path + path;
+	}
 
         if (vname == "ajax_document_revert") {
             return base_path + "/revert/" + arguments[1] + '/';
         }
 
 
-		if (vname == "ajax_document_history") {
-
-			return base_path + "/history/" + arguments[1] + '/';
-		}
+	if (vname == "ajax_document_history") {
+	    return base_path + "/history/" + arguments[1] + '/';
+	}
 
-		if (vname == "ajax_document_gallery") {
+	if (vname == "ajax_document_scans") {
+            return base_path + "/scans/" + arguments[1] + '/';
+	}
+	if (vname == "ajax_document_gallery") {
+	    return base_path + "/gallery/" + arguments[1] + '/';
+	}
 
-			return base_path + "/gallery/" + arguments[1] + '/';
-		}
-
-		if (vname == "ajax_document_diff")
-			return base_path + "/diff/" + arguments[1] + '/';
+	if (vname == "ajax_document_diff")
+	    return base_path + "/diff/" + arguments[1] + '/';
 
         if (vname == "ajax_document_rev")
             return base_path + "/rev/" + arguments[1] + '/';
 
-		if (vname == "ajax_document_pubmark")
-			return base_path + "/pubmark/" + arguments[1] + '/';
-
-		if (vname == "ajax_cover_preview")
-			return "/cover/preview/";
-
-		console.log("Couldn't reverse match:", vname);
-		return "/404.html";
-	};
-
-	/*
-	 * Document Abstraction
-	 */
-	function WikiDocument(element_id) {
-		var meta = $('#' + element_id);
-		this.id = meta.attr('data-chunk-id');
-
-		this.revision = $("*[data-key='revision']", meta).text();
-		this.readonly = !!$("*[data-key='readonly']", meta).text();
-
-		this.galleryLink = $("*[data-key='gallery']", meta).text();
-        this.galleryStart = parseInt($("*[data-key='gallery-start']", meta).text());
-
-        var diff = $("*[data-key='diff']", meta).text();
-        if (diff) {
-            diff = diff.split(',');
-            if (diff.length == 2 && diff[0] < diff[1])
-                this.diff = diff;
-            else if (diff.length == 1) {
-                diff = parseInt(diff);
-                if (diff != NaN)
-                    this.diff = [diff - 1, diff];
-            }
+	if (vname == "ajax_document_pubmark")
+	    return base_path + "/pubmark/" + arguments[1] + '/';
+
+	if (vname == "ajax_cover_preview")
+	    return "/cover/preview/";
+
+	console.log("Couldn't reverse match:", vname);
+	return "/404.html";
+    };
+    class Api {
+        static csrf = $('input[name="csrfmiddlewaretoken"]').val();
+
+        // TODO: Add waiting marker, error reporting.
+        static post(url, data) {
+            data['csrfmiddlewaretoken'] = this.csrf;
+            $.ajax({
+                url: url,
+                type: "POST",
+                data: data
+            });
+        }
+
+        static get(url, callback) {
+            $.ajax({
+                url: url,
+                type: "GET",
+                success: function(data) {
+                    callback(data);
+                },
+            });
+        }
+
+        static setGallery(id, gallery) {
+            this.post(
+                '/editor/set-gallery/' + id + '/',
+                {gallery: gallery}
+            )
         }
+        static setGalleryStart(id, start) {
+            this.post(
+                '/editor/set-gallery-start/' + id + '/',
+                {start: start}
+            )
+        }
+
+        static openGalleryEdit(bookSlug) {
+            window.open(
+                '/documents/book/' + bookSlug + '/gallery/',
+                '_blank'
+            ).focus();
+        }
+
+        static withGalleryList(callback) {
+            this.get(
+                '/editor/galleries/',
+                callback
+            );
+        }
+    }
 
-		this.galleryImages = [];
-		this.text = null;
-		this.has_local_changes = false;
-		this._lock = -1;
-		this._context_lock = -1;
-		this._lock_count = 0;
-	};
-
-	WikiDocument.prototype.triggerDocumentChanged = function() {
-		$(document).trigger('wlapi_document_changed', this);
-	};
-	/*
-	 * Fetch text of this document.
-	 */
-	WikiDocument.prototype.fetch = function(params) {
-		params = $.extend({}, noops, params);
-		var self = this;
-		$.ajax({
-			method: "GET",
-			url: reverse("ajax_document_text", self.id),
-			data: {"revision": self.revision},
-			dataType: 'json',
-			success: function(data) {
-				var changed = false;
-
-				if (self.text === null || self.revision !== data.revision) {
-					self.text = data.text;
-					self.revision = data.revision;
-					self.gallery = data.gallery;
-					changed = true;
-					self.triggerDocumentChanged();
-				};
-
-				self.has_local_changes = false;
-				params['success'](self, changed);
-			},
-			error: function() {
-				params['failure'](self, "Nie udało się wczytać treści dokumentu.");
-			}
-		});
-	};
-	/*
-	 * Fetch history of this document.
-	 *
-	 * from - First revision to fetch (default = 0) upto - Last revision to
-	 * fetch (default = tip)
-	 *
-	 */
-	WikiDocument.prototype.fetchHistory = function(params) {
-		/* this doesn't modify anything, so no locks */
-		params = $.extend({}, noops, params);
-		var self = this;
-		$.ajax({
-			method: "GET",
-			url: reverse("ajax_document_history", self.id),
-			dataType: 'json',
-			data: {
-				"from": params['from'],
-				"upto": params['upto']
-			},
-			success: function(data) {
-				params['success'](self, data);
-			},
-			error: function() {
-				params['failure'](self, "Nie udało się wczytać historii dokumentu.");
-			}
-		});
-	};
-	WikiDocument.prototype.fetchDiff = function(params) {
-		/* this doesn't modify anything, so no locks */
-		var self = this;
-		params = $.extend({
-			'from': self.revision,
-			'to': self.revision
-		}, noops, params);
-		$.ajax({
-			method: "GET",
-			url: reverse("ajax_document_diff", self.id),
-			dataType: 'html',
-			data: {
-				"from": params['from'],
-				"to": params['to']
-			},
-			success: function(data) {
-				params['success'](self, data);
-			},
-			error: function() {
-				params['failure'](self, "Nie udało się wczytać porównania wersji.");
-			}
-		});
-	};
-
-    WikiDocument.prototype.checkRevision = function(params) {
-        /* this doesn't modify anything, so no locks */
-        var self = this;
-        $.ajax({
-            method: "GET",
-            url: reverse("ajax_document_rev", self.id),
-            dataType: 'text',
-            success: function(data) {
-                if (data == '') {
-                    if (params.error)
-                        params.error();
+    /*
+     * Document Abstraction
+     */
+    class WikiDocument {
+        constructor(element_id) {
+	    var meta = $('#' + element_id);
+	    this.id = meta.attr('data-chunk-id');
+
+	    this.revision = $("*[data-key='revision']", meta).text();
+	    this.readonly = !!$("*[data-key='readonly']", meta).text();
+
+	    this.bookSlug = $("*[data-key='book-slug']", meta).text();
+	    this.scansLink = $("*[data-key='scans']", meta).text();
+	    this.galleryLink = $("*[data-key='gallery']", meta).text();
+            this.galleryStart = parseInt($("*[data-key='gallery-start']", meta).text());
+            this.fullUri = $("*[data-key='full-uri']", meta).text();
+
+	    this.text = null;
+	    this.has_local_changes = false;
+            this.active = true;
+	    this._lock = -1;
+	    this._context_lock = -1;
+	    this._lock_count = 0;
+        };
+
+        triggerDocumentChanged() {
+	    $(document).trigger('wlapi_document_changed', this);
+        }
+
+        /*
+         * Fetch text of this document.
+         */
+        fetch(params) {
+	    params = $.extend({}, noops, params);
+	    var self = this;
+	    $.ajax({
+	        method: "GET",
+	        url: reverse("ajax_document_text", self.id),
+	        data: {"revision": self.revision},
+	        dataType: 'json',
+	        success: function(data) {
+		    var changed = false;
+
+		    if (self.text === null || self.revision !== data.revision) {
+		        self.text = data.text;
+                        $.wiki.undo.push(data.text);
+		        self.revision = data.revision;
+		        self.gallery = data.gallery;
+		        changed = true;
+		        self.triggerDocumentChanged();
+		    };
+
+		    self.has_local_changes = false;
+		    params['success'](self, changed);
+	        },
+	        error: function() {
+		    params['failure'](self, "Nie udało się wczytać treści dokumentu.");
+	        }
+	    });
+        }
+
+        /*
+         * Fetch history of this document.
+         */
+        fetchHistory(params) {
+	    /* this doesn't modify anything, so no locks */
+	    params = $.extend({}, noops, params);
+	    var self = this;
+	    $.ajax({
+	        method: "GET",
+	        url: reverse("ajax_document_history", self.id) + "?before=" + params.before,
+	        dataType: 'json',
+	        success: function(data) {
+		    params['success'](self, data);
+	        },
+	        error: function() {
+		    params['failure'](self, "Nie udało się wczytać historii dokumentu.");
+	        }
+	    });
+        }
+
+        fetchDiff(params) {
+	    /* this doesn't modify anything, so no locks */
+	    var self = this;
+	    params = $.extend({
+	        'from': self.revision,
+	        'to': self.revision
+	    }, noops, params);
+	    $.ajax({
+	        method: "GET",
+	        url: reverse("ajax_document_diff", self.id),
+	        dataType: 'html',
+	        data: {
+		    "from": params['from'],
+		    "to": params['to']
+	        },
+	        success: function(data) {
+		    params['success'](self, data);
+	        },
+	        error: function() {
+		    params['failure'](self, "Nie udało się wczytać porównania wersji.");
+	        }
+	    });
+        }
+
+        checkRevision(params) {
+            /* this doesn't modify anything, so no locks */
+            var self = this;
+            let active = self.active;
+            self.active = false;
+            $.ajax({
+                method: "GET",
+                url: reverse("ajax_document_rev", self.id),
+                data: {
+                    'a': active,
+                },
+                dataType: 'text',
+                success: function(data) {
+                    if (data == '') {
+                        if (params.error)
+                            params.error();
+                    }
+                    else if (data != self.revision)
+                        params.outdated();
                 }
-                else if (data != self.revision)
-                    params.outdated();
+            });
+        }
+
+        refreshImageGallery(params) {
+            if (this.galleryLink) {
+                params = $.extend({}, params, {
+                    url: reverse("ajax_document_gallery", this.galleryLink)
+                });
             }
-        });
-    };
+            this.refreshGallery(params);
+        }
 
-	/*
-	 * Fetch gallery
-	 */
-	WikiDocument.prototype.refreshGallery = function(params) {
-		params = $.extend({}, noops, params);
-		var self = this;
-		if (!self.galleryLink) {
-			params['failure'](self, 'Brak galerii.');
-			return;
-		}
-		$.ajax({
-			method: "GET",
-			url: reverse("ajax_document_gallery", self.galleryLink),
-			dataType: 'json',
-			// data: {},
-			success: function(data) {
-				self.galleryImages = data;
-				params['success'](self, data);
-			},
-			error: function(xhr) {
-                switch (xhr.status) {
+        refreshScansGallery(params) {
+            if (this.scansLink) {
+                params = $.extend({}, params, {
+                    url: reverse("ajax_document_scans", this.scansLink)
+                });
+                this.refreshGallery(params);
+            } else {
+                // Fallback to image gallery.
+                this.refreshImageGallery(params)
+            }
+        }
+        
+        /*
+         * Fetch gallery
+         */
+        refreshGallery(params) {
+	    params = $.extend({}, noops, params);
+	    var self = this;
+            if (!params.url) {
+	        params.failure('Brak galerii.');
+	        return;
+            }
+	    $.ajax({
+	        method: "GET",
+	        url: params.url,
+	        dataType: 'json',
+	        success: function(data) {
+		    params.success(data);
+	        },
+	        error: function(xhr) {
+                    switch (xhr.status) {
                     case 403:
                         var msg = 'Galerie dostępne tylko dla zalogowanych użytkowników.';
                         break;
                     case 404:
-                        var msg = "Nie znaleziono galerii o nazwie: '" + self.galleryLink + "'.";
+                        var msg = "Nie znaleziono galerii.";
                     default:
-                        var msg = "Nie udało się wczytać galerii o nazwie: '" + self.galleryLink + "'.";
-                }
-				self.galleryImages = [];
-				params['failure'](self, msg);
-			}
-		});
-	};
-
-	/*
-	 * Set document's text
-	 */
-	WikiDocument.prototype.setText = function(text) {
-		return this.setDocumentProperty('text', text);
-	};
-
-	/*
-	 * Set document's gallery link
-	 */
-	WikiDocument.prototype.setGalleryLink = function(gallery) {
-		return this.setDocumentProperty('galleryLink', gallery);
-	};
-
-	/*
-	 * Set document's property
-	 */
-	WikiDocument.prototype.setDocumentProperty = function(property, value) {
-		if(this[property] !== value) {
-			this[property] = value;
-			this.has_local_changes = true;
-		}
-	};
-
-	/*
-	 * Save text back to the server
-	 */
-	WikiDocument.prototype.save = function(params) {
-		params = $.extend({}, noops, params);
-		var self = this;
-
-		if (!self.has_local_changes) {
-			console.log("Abort: no changes.");
-			return params['success'](self, false, "Nie ma zmian do zapisania.");
-		};
-
-		// Serialize form to dictionary
-		var data = {};
-		$.each(params['form'].serializeArray(), function() {
-			data[this.name] = this.value;
-		});
-
-		data['textsave-text'] = self.text;
-
-		$.ajax({
-			url: reverse("ajax_document_text", self.id),
-			type: "POST",
-			dataType: "json",
-			data: data,
-			success: function(data) {
-				var changed = false;
-
-                $('#header').removeClass('saving');
-
-				if (data.text) {
-					self.text = data.text;
-					self.revision = data.revision;
-					self.gallery = data.gallery;
-					changed = true;
-					self.triggerDocumentChanged();
-				};
-
-				params['success'](self, changed, ((changed && "Udało się zapisać :)") || "Twoja wersja i serwera jest identyczna"));
-			},
-			error: function(xhr) {
-                if ($('#header').hasClass('saving')) {
-                    $('#header').removeClass('saving');
-                    $.blockUI({
-                        message: "<p>Nie udało się zapisać zmian. <br/><button onclick='$.unblockUI()'>OK</button></p>"
-                    })
-                }
-                else {
-                    try {
-                        params['failure'](self, $.parseJSON(xhr.responseText));
+                        var msg = "Nie udało się wczytać galerii.";
                     }
-                    catch (e) {
-                        params['failure'](self, {
-                            "__message": "<p>Nie udało się zapisać - błąd serwera.</p>"
-                        });
-                    };
-                }
-
-			}
-		});
+		    params.failure(msg);
+	        }
+	    });
+        }
 
-        $('#save-hide').click(function(){
-            $('#header').addClass('saving');
-            $.unblockUI();
-            $.wiki.blocking.unblock();
-        });
-	}; /* end of save() */
+        setGallery(gallery) {
+            this.galleryLink = gallery;
+            Api.setGallery(this.id, gallery);
+        }
 
-    WikiDocument.prototype.revertToVersion = function(params) {
-        var self = this;
-        params = $.extend({}, noops, params);
+        setGalleryStart(start) {
+            this.galleryStart = start;
+            Api.setGalleryStart(this.id, start);
+        }
 
-        if (params.revision >= this.revision) {
-            params.failure(self, 'Proszę wybrać rewizję starszą niż aktualna.');
-            return;
+        openGalleryEdit(start) {
+            Api.openGalleryEdit(this.bookSlug);
         }
 
-        // Serialize form to dictionary
-        var data = {};
-        $.each(params['form'].serializeArray(), function() {
-            data[this.name] = this.value;
-        });
-
-        $.ajax({
-            url: reverse("ajax_document_revert", self.id),
-            type: "POST",
-            dataType: "json",
-            data: data,
-            success: function(data) {
-                if (data.text) {
-                    self.text = data.text;
-                    self.revision = data.revision;
-                    self.gallery = data.gallery;
-                    self.triggerDocumentChanged();
-
-                    params.success(self, "Udało się przywrócić wersję :)");
-                }
-                else {
-                    params.failure(self, "Przywracana wersja identyczna z aktualną. Anulowano przywracanie.");
-                }
-            },
-            error: function(xhr) {
-                params.failure(self, "Nie udało się przywrócić wersji - błąd serwera.");
+        withGalleryList(callback) {
+            Api.withGalleryList(callback);
+        }
+        
+        /*
+         * Set document's text
+         */
+        setText(text, silent=false) {
+            if (text == this.text) return;
+            if (!silent) {
+                $.wiki.undo.push(text);
             }
-        });
-    };
+            this.text = text;
+            this.has_local_changes = true;
+        }
+
+        undo() {
+            let ctx = $.wiki.exitContext();
+            this.setText(
+                $.wiki.undo.undo(),
+                true
+            );
+            $.wiki.enterContext(ctx);
+        }
+        redo() {
+            let ctx = $.wiki.exitContext();
+            this.setText(
+                $.wiki.undo.redo(),
+                true
+            );
+            $.wiki.enterContext(ctx);
+        }
+
+        /*
+         * Save text back to the server
+         */
+        save(params) {
+	    params = $.extend({}, noops, params);
+	    var self = this;
+
+	    if (!self.has_local_changes) {
+	        console.log("Abort: no changes.");
+	        return params['success'](self, false, "Nie ma zmian do zapisania.");
+	    };
+
+	    // Serialize form to dictionary
+	    var data = {};
+	    $.each(params['form'].serializeArray(), function() {
+	        data[this.name] = this.value;
+	    });
+
+	    data['textsave-text'] = self.text;
+
+	    $.ajax({
+	        url: reverse("ajax_document_text", self.id),
+	        type: "POST",
+	        dataType: "json",
+	        data: data,
+	        success: function(data) {
+		    var changed = false;
+
+                    $('#header').removeClass('saving');
 
-	WikiDocument.prototype.pubmark = function(params) {
-		params = $.extend({}, noops, params);
-		var self = this;
-		var data = {
-			"pubmark-id": self.id,
-		};
-
-		/* unpack form */
-		$.each(params.form.serializeArray(), function() {
-			data[this.name] = this.value;
-		});
-
-		$.ajax({
-			url: reverse("ajax_document_pubmark", self.id),
-			type: "POST",
-			dataType: "json",
-			data: data,
-			success: function(data) {
-				params.success(self, data.message);
-			},
-			error: function(xhr) {
-				if (xhr.status == 403 || xhr.status == 401) {
-					params.failure(self, {
-						"__all__": ["Nie masz uprawnień lub nie jesteś zalogowany."]
-					});
-				}
-				else {
-					try {
-						params.failure(self, $.parseJSON(xhr.responseText));
-					}
-					catch (e) {
-						params.failure(self, {
-							"__all__": ["Nie udało się - błąd serwera."]
-						});
-					};
-				};
-			}
-		});
-	};
-
-	WikiDocument.prototype.refreshCover = function(params) {
-        var self = this;
-		var data = {
-			xml: self.text // TODO: send just DC
-		};
-        $.ajax({
-            url: reverse("ajax_cover_preview"),
-            type: "POST",
-            data: data,
-            success: function(data) {
-                params.success(data);
-            },
-            error: function(xhr) {
-                // params.failure("Nie udało się odświeżyć okładki - błąd serwera.");
+		    if (data.text) {
+		        self.text = data.text;
+		        self.revision = data.revision;
+		        self.gallery = data.gallery;
+		        changed = true;
+		        self.triggerDocumentChanged();
+		    };
+
+		    params['success'](self, changed, ((changed && "Udało się zapisać :)") || "Twoja wersja i serwera jest identyczna"));
+	        },
+	        error: function(xhr) {
+                    if ($('#header').hasClass('saving')) {
+                        $('#header').removeClass('saving');
+                        $.blockUI({
+                            message: "<p>Nie udało się zapisać zmian. <br/><button onclick='$.unblockUI()'>OK</button></p>"
+                        })
+                    }
+                    else {
+                        try {
+                            params['failure'](self, $.parseJSON(xhr.responseText));
+                        }
+                        catch (e) {
+                            params['failure'](self, {
+                                "__message": "<p>Nie udało się zapisać - błąd serwera.</p>"
+                            });
+                        };
+                    }
+	        }
+	    });
+
+            $('#save-hide').click(function(){
+                $('#header').addClass('saving');
+                $.unblockUI();
+                $.wiki.blocking.unblock();
+            });
+        } /* end of save() */
+
+        revertToVersion(params) {
+            var self = this;
+            params = $.extend({}, noops, params);
+
+            if (params.revision >= this.revision) {
+                params.failure(self, 'Proszę wybrać rewizję starszą niż aktualna.');
+                return;
             }
-        });
- 	};
 
+            // Serialize form to dictionary
+            var data = {};
+            $.each(params['form'].serializeArray(), function() {
+                data[this.name] = this.value;
+            });
+
+            $.ajax({
+                url: reverse("ajax_document_revert", self.id),
+                type: "POST",
+                dataType: "json",
+                data: data,
+                success: function(data) {
+                    if (data.text) {
+                        self.text = data.text;
+                        self.revision = data.revision;
+                        self.gallery = data.gallery;
+                        self.triggerDocumentChanged();
+
+                        params.success(self, "Udało się przywrócić wersję :)");
+                    }
+                    else {
+                        params.failure(self, "Przywracana wersja identyczna z aktualną. Anulowano przywracanie.");
+                    }
+                },
+                error: function(xhr) {
+                    params.failure(self, "Nie udało się przywrócić wersji - błąd serwera.");
+                }
+            });
+        }
 
-    WikiDocument.prototype.getLength = function(params) {
-        params = $.extend({}, noops, params);
-        var xml = this.text.replace(/\/(\s+)/g, '<br />$1');
-        var parser = new DOMParser();
-        var doc = parser.parseFromString(xml, 'text/xml');
-        var error = $('parsererror', doc);
+        pubmark(params) {
+	    params = $.extend({}, noops, params);
+	    var self = this;
+	    var data = {
+	        "pubmark-id": self.id,
+	    };
+
+	    /* unpack form */
+	    $.each(params.form.serializeArray(), function() {
+	        data[this.name] = this.value;
+	    });
+
+	    $.ajax({
+	        url: reverse("ajax_document_pubmark", self.id),
+	        type: "POST",
+	        dataType: "json",
+	        data: data,
+	        success: function(data) {
+		    params.success(self, data.message);
+	        },
+	        error: function(xhr) {
+		    if (xhr.status == 403 || xhr.status == 401) {
+		        params.failure(self, {
+			    "__all__": ["Nie masz uprawnień lub nie jesteś zalogowany."]
+		        });
+		    }
+		    else {
+		        try {
+			    params.failure(self, $.parseJSON(xhr.responseText));
+		        }
+		        catch (e) {
+			    params.failure(self, {
+			        "__all__": ["Nie udało się - błąd serwera."]
+			    });
+		        };
+		    };
+	        }
+	    });
+        }
 
-        if (error.length > 0) {
-            throw "Not an XML document.";
+        refreshCover(params) {
+            var self = this;
+	    var data = {
+	        xml: self.text // TODO: send just DC
+	    };
+            $.ajax({
+                url: reverse("ajax_cover_preview"),
+                type: "POST",
+                data: data,
+                success: function(data) {
+                    params.success(data);
+                },
+                error: function(xhr) {
+                    // params.failure("Nie udało się odświeżyć okładki - błąd serwera.");
+                }
+            });
         }
-        $.xmlns["rdf"] = "http://www.w3.org/1999/02/22-rdf-syntax-ns#"; 
-        $('rdf|RDF', doc).remove();
-        if (params.noFootnotes) {
-            $('pa, pe, pr, pt', doc).remove();
+
+        getLength(params) {
+            params = $.extend({}, noops, params);
+            var xml = this.text.replace(/\/(\s+)/g, '<br />$1');
+            var parser = new DOMParser();
+            var doc = parser.parseFromString(xml, 'text/xml');
+            var error = $('parsererror', doc);
+
+            if (error.length > 0) {
+                throw "Not an XML document.";
+            }
+            $.xmlns["rdf"] = "http://www.w3.org/1999/02/22-rdf-syntax-ns#";
+            $('rdf|RDF', doc).remove();
+            if (params.noFootnotes) {
+                $('pa, pe, pr, pt', doc).remove();
+            }
+	    if (params.noThemes) {
+	        $('motyw', doc).remove();
+            }
+            var text = $(doc).text();
+            text = $.trim(text.replace(/\s{2,}/g, ' '));
+            return text.length;
         }
-	if (params.noThemes) {
-	    $('motyw', doc).remove();
+
+        /* Temporary workaround for relative images. */
+        getBase() {
+            return '/media/dynamic/images/' + this.galleryLink + '/';
         }
-        var text = $(doc).text();
-        text = $.trim(text.replace(/\s{2,}/g, ' '));
-        return text.length;
     }
 
-    /* Temporary workaround for relative images. */
-    WikiDocument.prototype.getBase = function() {
-        return '/media/dynamic/images/' + this.galleryLink + '/';
-    };
-
-	$.wikiapi.WikiDocument = WikiDocument;
+    $.wikiapi.WikiDocument = WikiDocument;
 })(jQuery);