266 lines
9.1 KiB
JavaScript
266 lines
9.1 KiB
JavaScript
var editor = {};
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editor.PARAGRAPH_TYPES = new Set(["P", "PRE"]);
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editor.Editor =
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function Editor(elements, on_open, on_save, on_cancel)
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{
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/*
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This class wraps around display elements like headers and paragraphs, and
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creates edit elements like inputs and textareas to edit them with.
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You may add the following data- attributes to your display elements to
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affect their corresponding edit elements:
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data-editor-empty-text: If the display element contains this text, then
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the edit element will be set to "" when opened.
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If the edit element contains "", then the display element will
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contain this text when saved.
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data-editor-id: The string used as the key into display_element_map and
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edit_element_map.
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data-editor-placeholder: The placeholder attribute of the edit element.
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Your on_open, on_save and on_cancel hooks will be called with:
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1. This editor object.
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2. The edit elements as either:
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If ALL of the display elements have a data-editor-id,
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then a dictionary of {data-editor-id: edit_element, ...}.
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Otherwise, an array of [edit_element, ...] in the order they were
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given to the constructor.
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3. The display elements as either the map or the array, similarly.
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When your callbacks are used, the default `open`, `save`, `cancel`
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methods are not called automatically. You should call them from within
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your function. That's because you may wish to do some of your own
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normalization before the default handler, and some of your own cleanup
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after it. So it is up to you when to call the default.
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*/
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this.cancel = function()
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{
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this.close();
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};
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this.close = function()
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{
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for (var index = 0; index < this.display_elements.length; index += 1)
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{
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this.display_elements[index].classList.remove("hidden");
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this.edit_elements[index].classList.add("hidden");
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}
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this.hide_spinner();
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this.hide_error();
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this.open_button.classList.remove("hidden");
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this.save_button.classList.add("hidden");
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this.cancel_button.classList.add("hidden");
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};
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this.hide_error = function()
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{
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this.error_message.classList.add("hidden");
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};
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this.hide_spinner = function()
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{
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this.spinner.classList.add("hidden");
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};
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this.open = function()
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{
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for (var index = 0; index < this.display_elements.length; index += 1)
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{
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var display_element = this.display_elements[index];
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var edit_element = this.edit_elements[index];
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display_element.classList.add("hidden");
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edit_element.classList.remove("hidden");
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var empty_text = display_element.dataset.editorEmptyText;
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if (empty_text !== undefined && display_element.innerText == empty_text)
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{
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edit_element.value = "";
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}
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else
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{
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edit_element.value = display_element.innerText;
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}
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}
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this.open_button.classList.add("hidden");
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this.save_button.classList.remove("hidden");
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this.cancel_button.classList.remove("hidden");
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};
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this.save = function()
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{
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for (var index = 0; index < this.display_elements.length; index += 1)
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{
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var display_element = this.display_elements[index];
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var edit_element = this.edit_elements[index];
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if (display_element.dataset.editorEmptyText !== undefined && edit_element.value == "")
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{
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display_element.innerText = display_element.dataset.editorEmptyText;
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}
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else
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{
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display_element.innerText = edit_element.value;
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}
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}
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this.close();
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};
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this.show_error = function(message)
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{
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this.hide_spinner();
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this.error_message.innerText = message;
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this.error_message.classList.remove("hidden");
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};
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this.show_spinner = function()
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{
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this.hide_error();
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this.spinner.classList.remove("hidden");
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};
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this.display_elements = [];
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this.edit_elements = [];
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this.can_use_element_map = true;
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this.display_element_map = {};
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this.edit_element_map = {};
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this.misc_data = {};
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for (var index = 0; index < elements.length; index += 1)
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{
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var display_element = elements[index];
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var edit_element;
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if (editor.PARAGRAPH_TYPES.has(display_element.tagName))
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{
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edit_element = document.createElement("textarea");
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edit_element.rows = 6;
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}
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else
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{
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edit_element = document.createElement("input");
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edit_element.type = "text";
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}
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edit_element.classList.add("editor_input");
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edit_element.classList.add("hidden");
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if (display_element.dataset.editorPlaceholder !== undefined)
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{
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edit_element.placeholder = display_element.dataset.editorPlaceholder;
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}
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if (this.can_use_element_map)
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{
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if (display_element.dataset.editorId !== undefined)
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{
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this.display_element_map[display_element.dataset.editorId] = display_element;
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this.edit_element_map[display_element.dataset.editorId] = edit_element;
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}
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else
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{
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this.can_use_element_map = false;
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this.edit_element_map = null;
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this.display_element_map = null;
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}
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}
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display_element.parentElement.insertBefore(edit_element, display_element.nextSibling);
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this.display_elements.push(display_element);
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this.edit_elements.push(edit_element);
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}
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this.binder = function(func, fallback)
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{
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/*
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Given a function that takes an Editor as its first argument, and the
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element arrays/maps as the second and third, return a new function
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which requires no arguments and calls the given function with the
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correct data.
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This is done so that the new function can be used in an event handler.
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*/
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if (func == undefined)
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{
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return fallback.bind(this);
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}
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var bindable = function()
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{
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if (this.can_use_element_map)
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{
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func(this, this.edit_element_map, this.display_element_map);
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}
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else
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{
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func(this, this.edit_elements, this.display_elements);
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}
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}
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return bindable.bind(this);
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}
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var placeholders = document.getElementsByClassName("editor_toolbox_placeholder");
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for (var index = 0; index < placeholders.length; index += 1)
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{
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placeholders[index].parentElement.removeChild(placeholders[index]);
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}
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var last_element = this.edit_elements[this.edit_elements.length - 1];
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var toolbox = document.createElement("div");
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toolbox.classList.add("editor_toolbox");
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last_element.parentElement.insertBefore(toolbox, last_element.nextSibling);
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this.open_button = document.createElement("button");
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this.open_button.innerText = "Edit";
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this.open_button.classList.add("editor_button");
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this.open_button.classList.add("editor_open_button");
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this.open_button.classList.add("green_button");
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this.open_button.onclick = this.binder(on_open, this.open);
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toolbox.appendChild(this.open_button);
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this.save_button = document.createElement("button");
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this.save_button.innerText = "Save";
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this.save_button.classList.add("editor_button");
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this.save_button.classList.add("editor_save_button");
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this.save_button.classList.add("green_button");
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this.save_button.classList.add("hidden");
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this.save_button.onclick = this.binder(on_save, this.save);
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toolbox.appendChild(this.save_button);
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toolbox.appendChild(document.createTextNode(" "));
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this.cancel_button = document.createElement("button");
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this.cancel_button.innerText = "Cancel";
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this.cancel_button.classList.add("editor_button");
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this.cancel_button.classList.add("editor_cancel_button");
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this.cancel_button.classList.add("gray_button");
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this.cancel_button.classList.add("hidden");
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this.cancel_button.onclick = this.binder(on_cancel, this.cancel);
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toolbox.appendChild(this.cancel_button);
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this.error_message = document.createElement("span");
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this.error_message.classList.add("editor_error");
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this.error_message.classList.add("hidden");
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toolbox.appendChild(this.error_message);
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this.spinner = document.createElement("span");
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this.spinner.innerText = "Submitting...";
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this.spinner.classList.add("editor_spinner");
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this.spinner.classList.add("hidden");
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toolbox.appendChild(this.spinner);
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for (var index = 0; index < this.edit_elements.length; index += 1)
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{
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var edit_element = this.edit_elements[index];
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if (edit_element.tagName == "TEXTAREA")
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{
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common.bind_box_to_button(edit_element, this.save_button, true);
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}
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else
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{
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common.bind_box_to_button(edit_element, this.save_button, false);
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}
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}
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}
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