ycdl/frontends/ycdl_flask/static/js/common.js

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const common = {};
common.INPUT_TYPES = new Set(["INPUT", "TEXTAREA"]);
common._request =
function _request(method, url, callback)
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{
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const request = new XMLHttpRequest();
const response = {
"completed": false,
"meta": {"status": 0},
};
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request.onreadystatechange = function()
{
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if (request.readyState != 4)
{return;}
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if (callback == null)
{return;}
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response.meta.status = request.status;
response.meta.request_url = url;
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if (request.status != 0)
{
response.completed = true;
try
{
response.data = JSON.parse(request.responseText);
response.meta.json_ok = true;
}
catch (exc)
{
response.meta.json_ok = false;
}
}
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callback(response);
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};
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const asynchronous = true;
request.open(method, url, asynchronous);
return request;
}
common.get =
function get(url, callback)
{
request = common._request("GET", url, callback);
request.send();
}
common.post =
function post(url, data, callback)
{
request = common._request("POST", url, callback);
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request.send(data);
}
common.bind_box_to_button =
function bind_box_to_button(box, button, ctrl_enter)
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{
/*
Bind a textbox to a button so that pressing Enter within the textbox is the
same as clicking the button.
If `ctrl_enter` is true, then you must press ctrl+Enter to trigger the
button, which is important for textareas.
Thanks Yaroslav Yakovlev
http://stackoverflow.com/a/9343095
*/
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const bound_box_hook = function(event)
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{
if (event.key !== "Enter")
{return;}
ctrl_success = !ctrl_enter || (event.ctrlKey);
if (! ctrl_success)
{return;}
button.click();
}
box.addEventListener("keyup", bound_box_hook);
}
common.create_message_bubble =
function create_message_bubble(message_area, message_positivity, message_text, lifespan)
{
if (lifespan === undefined)
{
lifespan = 8000;
}
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const message = document.createElement("div");
message.className = "message_bubble " + message_positivity;
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const span = document.createElement("span");
span.innerHTML = message_text;
message.appendChild(span);
message_area.appendChild(message);
setTimeout(function(){message_area.removeChild(message);}, lifespan);
}
common.delete_all_children =
function delete_all_children(element)
{
while (element.firstChild)
{
element.removeChild(element.firstChild);
}
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}
common.entry_with_history_hook =
function entry_with_history_hook(event)
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{
const box = event.target;
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if (box.entry_history === undefined)
{box.entry_history = [];}
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if (box.entry_history_pos === undefined)
{box.entry_history_pos = null;}
if (event.key === "Enter")
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{
if (box.value === "")
{return;}
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box.entry_history.push(box.value);
box.entry_history_pos = null;
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}
else if (event.key === "Escape")
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{
box.entry_history_pos = null;
box.value = "";
}
if (box.entry_history.length == 0)
{return}
if (box.entry_history_pos !== null && box.value !== box.entry_history[box.entry_history_pos])
{return;}
if (event.key === "ArrowUp")
{
if (box.entry_history_pos === null)
{box.entry_history_pos = box.entry_history.length - 1;}
else if (box.entry_history_pos == 0)
{;}
else
{box.entry_history_pos -= 1;}
if (box.entry_history_pos === null)
{box.value = "";}
else
{box.value = box.entry_history[box.entry_history_pos];}
setTimeout(function(){box.selectionStart = box.value.length;}, 0);
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}
else if (event.key === "ArrowDown")
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{
if (box.entry_history_pos === null)
{;}
else if (box.entry_history_pos == box.entry_history.length-1)
{box.entry_history_pos = null;}
else
{box.entry_history_pos += 1;}
if (box.entry_history_pos === null)
{box.value = "";}
else
{box.value = box.entry_history[box.entry_history_pos];}
setTimeout(function(){box.selectionStart = box.value.length;}, 0);
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}
}
common.html_to_element =
function html_to_element(html)
{
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const template = document.createElement("template");
template.innerHTML = html.trim();
return template.content.firstElementChild;
}
common.init_atag_merge_params =
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function init_atag_merge_params(a)
{
/*
To create an <a> tag where the ?parameters written on the href are merged
with the parameters of the current page URL, give it the class
"merge_params". If the URL and href contain the same parameter, the href
takes priority.
Optional:
data-merge-params: A whitelist of parameter names, separated by commas
or spaces. Only these parameters will be merged from the page URL.
data-merge-params-except: A blacklist of parameter names, separated by
commas or spaces. All parameters except these will be merged from
the page URL.
Example:
URL: ?filter=hello&orderby=score
href: "?orderby=date"
Result: "?filter=hello&orderby=date"
*/
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const page_params = Array.from(new URLSearchParams(window.location.search));
let to_merge;
if (a.dataset.mergeParams)
{
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const keep = new Set(a.dataset.mergeParams.split(/[\s,]+/));
to_merge = page_params.filter(key_value => keep.has(key_value[0]));
delete a.dataset.mergeParams;
}
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else if (a.dataset.mergeParamsExcept)
{
const remove = new Set(a.dataset.mergeParamsExcept.split(/[\s,]+/));
to_merge = page_params.filter(key_value => (! remove.has(key_value[0])));
delete a.dataset.mergeParamsExcept;
}
else
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{
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to_merge = page_params;
}
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to_merge = to_merge.concat(Array.from(new URLSearchParams(a.search)));
const new_params = new URLSearchParams();
for (const [key, value] of to_merge)
{ new_params.set(key, value); }
a.search = new_params.toString();
a.classList.remove("merge_params");
}
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common.init_all_atag_merge_params =
function init_all_atag_merge_params()
{
const page_params = Array.from(new URLSearchParams(window.location.search));
const as = Array.from(document.getElementsByClassName("merge_params"));
for (const a of as)
{
setTimeout(() => common.init_atag_merge_params(a), 0);
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}
}
common.init_button_with_confirm =
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function init_button_with_confirm(button)
{
/*
To create a button that requires a second confirmation step, assign it the
class "button_with_confirm".
Required:
data-onclick: String that would normally be the button's onclick.
This is done so that if the button_with_confirm fails to initialize,
the button will be non-operational as opposed to being operational
but with no confirmation. For dangerous actions I think this is a
worthwhile move though it could lead to feature downtime.
Optional:
data-prompt: Text that appears next to the confirm button. Default is
"Are you sure?".
data-prompt-class: CSS class for the prompt span.
data-confirm: Text inside the confirm button. Default is to inherit the
original button's text.
data-confirm-class: CSS class for the confirm button. Default is to
inheret all classes of the original button, except for
"button_with_confirm" of course.
data-cancel: Text inside the cancel button. Default is "Cancel".
data-cancel-class: CSS class for the cancel button.
data-holder-class: CSS class for the new span that holds the menu.
*/
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button.classList.remove("button_with_confirm");
const holder = document.createElement("span");
holder.className = ("confirm_holder " + (button.dataset.holderClass || "")).trim();
delete button.dataset.holderClass;
if (button.dataset.holderId)
{
holder.id = button.dataset.holderId;
delete button.dataset.holderId;
}
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button.parentElement.insertBefore(holder, button);
const holder_stage1 = document.createElement("span");
holder_stage1.className = "confirm_holder_stage1";
holder_stage1.appendChild(button);
holder.appendChild(holder_stage1);
const holder_stage2 = document.createElement("span");
holder_stage2.className = "confirm_holder_stage2 hidden";
holder.appendChild(holder_stage2);
let prompt;
let input_source;
if (button.dataset.isInput)
{
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prompt = document.createElement("input");
prompt.placeholder = button.dataset.prompt || "";
input_source = prompt;
}
else
{
prompt = document.createElement("span");
prompt.innerText = (button.dataset.prompt || "Are you sure?") + " ";
input_source = undefined;
}
if (button.dataset.promptClass)
{
prompt.className = button.dataset.promptClass;
}
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holder_stage2.appendChild(prompt)
delete button.dataset.prompt;
delete button.dataset.promptClass;
const button_confirm = document.createElement("button");
button_confirm.innerText = (button.dataset.confirm || button.innerText).trim();
if (button.dataset.confirmClass === undefined)
{
button_confirm.className = button.className;
button_confirm.classList.remove("button_with_confirm");
}
else
{
button_confirm.className = button.dataset.confirmClass;
}
button_confirm.input_source = input_source;
holder_stage2.appendChild(button_confirm);
holder_stage2.appendChild(document.createTextNode(" "));
if (button.dataset.isInput)
{
common.bind_box_to_button(prompt, button_confirm);
}
delete button.dataset.confirm;
delete button.dataset.confirmClass;
delete button.dataset.isInput;
const button_cancel = document.createElement("button");
button_cancel.innerText = button.dataset.cancel || "Cancel";
button_cancel.className = button.dataset.cancelClass || "";
holder_stage2.appendChild(button_cancel);
delete button.dataset.cancel;
delete button.dataset.cancelClass;
// If this is stupid, let me know.
const confirm_onclick = `
let holder = event.target.parentElement.parentElement;
holder.getElementsByClassName("confirm_holder_stage1")[0].classList.remove("hidden");
holder.getElementsByClassName("confirm_holder_stage2")[0].classList.add("hidden");
` + button.dataset.onclick;
button_confirm.onclick = Function(confirm_onclick);
button.removeAttribute("onclick");
button.onclick = function(event)
{
const holder = event.target.parentElement.parentElement;
holder.getElementsByClassName("confirm_holder_stage1")[0].classList.add("hidden");
holder.getElementsByClassName("confirm_holder_stage2")[0].classList.remove("hidden");
const input = holder.getElementsByTagName("input")[0];
if (input)
{
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input.focus();
}
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}
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button_cancel.onclick = function(event)
{
const holder = event.target.parentElement.parentElement;
holder.getElementsByClassName("confirm_holder_stage1")[0].classList.remove("hidden");
holder.getElementsByClassName("confirm_holder_stage2")[0].classList.add("hidden");
}
delete button.dataset.onclick;
}
common.init_all_button_with_confirm =
function init_all_button_with_confirm()
{
const buttons = Array.from(document.getElementsByClassName("button_with_confirm"));
for (const button of buttons)
{
setTimeout(() => common.init_button_with_confirm(button), 0);
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}
}
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common.init_enable_on_pageload =
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function init_enable_on_pageload(element)
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{
/*
To create an input element which is disabled at first, and is enabled when
the DOM has completed loading, give it the disabled attribute and the
class "enable_on_pageload".
*/
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element.disabled = false;
element.classList.remove("enable_on_pageload");
}
common.init_all_enable_on_pageload =
function init_all_enable_on_pageload()
{
const elements = Array.from(document.getElementsByClassName("enable_on_pageload"));
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for (const element of elements)
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{
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setTimeout(() => common.init_enable_on_pageload(element), 0);
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}
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}
common.init_entry_with_history =
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function init_entry_with_history(input)
{
input.addEventListener("keydown", common.entry_with_history_hook);
input.classList.remove("entry_with_history");
}
common.init_all_entry_with_history =
function init_all_entry_with_history()
{
const inputs = Array.from(document.getElementsByClassName("entry_with_history"));
for (const input of inputs)
{
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setTimeout(() => common.init_entry_with_history(input), 0);
}
}
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common.init_tabbed_container =
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function init_tabbed_container(tabbed_container)
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{
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const button_container = document.createElement("div");
button_container.className = "tab_buttons";
tabbed_container.prepend(button_container);
const tabs = Array.from(tabbed_container.getElementsByClassName("tab"));
for (const tab of tabs)
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{
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tab.classList.add("hidden");
const tab_id = tab.dataset.tabId || tab.dataset.tabTitle;
tab.dataset.tabId = tab_id;
tab.style.borderTopColor = "transparent";
const button = document.createElement("button");
button.className = "tab_button tab_button_inactive";
button.onclick = common.tabbed_container_switcher;
button.innerText = tab.dataset.tabTitle;
button.dataset.tabId = tab_id;
button_container.append(button);
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}
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tabs[0].classList.remove("hidden");
tabbed_container.dataset.activeTabId = tabs[0].dataset.tabId;
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button_container.firstElementChild.classList.remove("tab_button_inactive");
button_container.firstElementChild.classList.add("tab_button_active");
}
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common.init_all_tabbed_container =
function init_all_tabbed_container()
{
const tabbed_containers = Array.from(document.getElementsByClassName("tabbed_container"));
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for (const tabbed_container of tabbed_containers)
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{
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setTimeout(() => common.init_tabbed_container(tabbed_container), 0);
}
}
common.is_narrow_mode =
function is_narrow_mode()
{
return getComputedStyle(document.documentElement).getPropertyValue("--narrow").trim() === "1";
}
common.is_wide_mode =
function is_wide_mode()
{
return getComputedStyle(document.documentElement).getPropertyValue("--wide").trim() === "1";
}
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common.tabbed_container_switcher =
function tabbed_container_switcher(event)
{
const tab_button = event.target;
if (tab_button.classList.contains("tab_button_active"))
{ return; }
const tab_id = tab_button.dataset.tabId;
const tab_buttons = tab_button.parentElement.getElementsByClassName("tab_button");
for (const tab_button of tab_buttons)
{
if (tab_button.dataset.tabId === tab_id)
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{
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tab_button.classList.remove("tab_button_inactive");
tab_button.classList.add("tab_button_active");
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}
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else
{
tab_button.classList.remove("tab_button_active");
tab_button.classList.add("tab_button_inactive");
}
}
const tabbed_container = tab_button.closest(".tabbed_container");
tabbed_container.dataset.activeTabId = tab_id;
const tabs = tabbed_container.getElementsByClassName("tab");
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for (const tab of tabs)
{
if (tab.dataset.tabId === tab_id)
{ tab.classList.remove("hidden"); }
else
{ tab.classList.add("hidden"); }
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}
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}
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common.refresh =
function refresh()
{
window.location.reload();
}
common.on_pageload =
function on_pageload()
{
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common.init_all_atag_merge_params();
common.init_all_button_with_confirm();
common.init_all_enable_on_pageload();
common.init_all_entry_with_history();
common.init_all_tabbed_container();
}
document.addEventListener("DOMContentLoaded", common.on_pageload);