I'm trying to use one function and a lot of IF functions to run this code.
I'm going to make this as a note app.
I want to add an IF function that has an class called stop-note.
I want to add it in the notes list for it's IF function then I want to add it to the "renderNotes" for it's link like style.
notesList.on('click', function (e) {
e.preventDefault();
var target = $(e.target);
var abort = false;
// Listen to the selected note.
if (target.hasClass('listen-note')) {
if (abort) {
return;
}
var content = target.closest('.note').find('.content').text();
readOutLoud(content);
}
//Edit Note
if (target.hasClass('edit-note')) {
editText(content);
var dateTime = target.siblings('.date').text();
deleteNote(dateTime);
target.closest('.note').remove();
var content = target.closest('.note').find('.content').text();
}
// Delete note.
if (target.hasClass('delete-note')) {
var dateTime = target.siblings('.date').text();
deleteNote(dateTime);
target.closest('.note').remove();
}
});
This is my function that runs my function above.
function renderNotes(notes) {
var html = '';
if (notes.length) {
notes.forEach(function (note) {
html += `<li class="note">
<p class="header">
<span class="date">${note.date}</span>
Listen
Edit
html = <button class="stop-note" onclick="abort = true">Stop</button>
Delete
</p>
<p class="content">${note.content}</p>
</li>`;
});
} else {
html = '<li><p class="content">You don\'t have any notes yet.</p></li>';
}
notesList.html(html);
}
abort is a local variable, and you set it to false whenever they click on a note list. So onclick="abort = true" has no effect on the variable that's being tested in the function.
You need to make it a global variable.
window.abort = false;
notesList.on('click', function (e) {
e.preventDefault();
var target = $(e.target);
// Listen to the selected note.
if (target.hasClass('listen-note')) {
if (abort) {
return;
}
var content = target.closest('.note').find('.content').text();
readOutLoud(content);
}
//Edit Note
if (target.hasClass('edit-note')) {
editText(content);
var dateTime = target.siblings('.date').text();
deleteNote(dateTime);
target.closest('.note').remove();
var content = target.closest('.note').find('.content').text();
}
// Delete note.
if (target.hasClass('delete-note')) {
var dateTime = target.siblings('.date').text();
deleteNote(dateTime);
target.closest('.note').remove();
}
});
I have a trouble with jquery trigger click. I need to play audio from audio tag via trigger click. When i click first time on first element it work, but if I click in another element, the first click not work. If i click 2nd time it will be work.
var Audioplaying = false;
jQuery('.playAudio').click(function(e) {
var playerID = jQuery(this).next('.audioPlayer').attr('id');
var playerBTN = jQuery(this);
if (Audioplaying == false) {
Audioplaying = true;
jQuery("#"+playerID)[0].play();
playerBTN.addClass('play');
} else {
Audioplaying = false;
jQuery("#"+playerID)[0].pause();
playerBTN.removeClass('play');
}
e.preventDefault();
});
The variable Audioplaying is shared, it is not unique so you probably want it to be unique per element. So use data() to keep track of the state for each player.
jQuery('.playAudio').click(function(e) {
var player = jQuery(this).next('.audioPlayer');
var playerID = player.attr('id');
var playerState = player.data('isPlaying') || false; // get if it is running
player.data('isPlaying', !playerState); // update the boolean
var playerBTN = jQuery(this);
if (!playerState) {
jQuery("#"+playerID)[0].play();
playerBTN.addClass('play');
} else {
jQuery("#"+playerID)[0].pause();
playerBTN.removeClass('play');
}
e.preventDefault();
});
Maintain the state of each button separately. so, you can use an object with it's 'id' as the key.
example : { button_id : true/false }
var Audioplaying = {};
jQuery('.playAudio').click(function(e) {
var playerID = jQuery(this).next('.audioPlayer').attr('id');
var playerBTN = jQuery(this);
if (!Audioplaying[playerID]) {
Audioplaying[playerID] = true; // every button has it's own state maintained in the object.
jQuery("#"+playerID)[0].play();
playerBTN.addClass('play');
} else {
Audioplaying[playerID] = false;
jQuery("#"+playerID)[0].pause();
playerBTN.removeClass('play');
}
e.preventDefault();
});
Hope it helps you arrive at a optimal solution.
this is similar to a previous post where I wanted to sync my data source when the user changes rows in the grid (exactly as Access saves out a record)
In the post above am am shown how to do this when the user tabs into a new cell as follows...
function refreshFix1() {
kendo.ui.Grid.fn.refresh = (function (refresh) {
return function (e) {
this._refreshing = true;
refresh.call(this, e);
this._refreshing = false;
}
})(kendo.ui.Grid.fn.refresh);
kendo.ui.Grid.fn.current = (function (current) {
return function (element) {
// assuming element is td element, i.e. cell selection
if (!this._refreshing && element) {
this._lastFocusedCellIndex = $(element).index();
this._lastFocusedUid = $(element).closest("tr").data("uid");
// Added this For navigation mode
this._lastNavigationCell = this.tbody.find("tr:last td:last");
}
return current.call(this, element);
}
})(kendo.ui.Grid.fn.current);
kendo.ui.Grid.fn.refocusLastEditedCell = function () {
if (this._lastFocusedUid) {
var row = $(this.tbody).find("tr[data-uid='" + this._lastFocusedUid + "']");
var cell = $(row).children().eq(this._lastFocusedCellIndex);
this.editCell(cell);
}
};
The above gives us a function we can call (refocusLastEditedCell) after we sync the data source, and seems to work great.
I now want to do the same for when the grid is in Navigation mode. Following the above example, and the doco here , I added the following...
// Call this to go back to a cell in *navigation* mode
kendo.ui.Grid.fn.refocusLastNavigatedCell = function () {
var self = this;
if (this._lastNavigationCell) {
// try see if calling "async" using setTimeout will help
setTimeout (function(){
console.log("going back to navigation cell");
self.current(this._lastNavigationCell);
self.table.focus();
}, 10)
}
};
I then have the following code to call sync on the datasource...
vm.gridData.sync();
if (vm.editMode){
/ Go back to edit cell
grid.refocusLastEditedCell()
} else{
// Go back to navigation cell
grid.refocusLastNavigatedCell();
};
}
(full example here)
Unfortunately I do not seem to be going back to the same cell, it again just jumps to the top left cell.
Any ideas how to get it to work in this situation would be greatly appreciated.
Thanks in advance for any help!
You need to use the row uid and cell index as done in the original code; the <td> element you're trying to focus doesn't exist anymore once the grid gets rerendered. So you could do this:
kendo.ui.Grid.fn.current = (function (current) {
return function (element) {
// assuming element is td element, i.e. cell selection
if (!this._refreshing && element) {
this._lastFocusedCellIndex = $(element).index();
this._lastFocusedUid = $(element).closest("tr").data("uid");
// For navigation mode
var cell = current.call(this, element);
this._lastNavigationCellIndex = $(cell).index();
this._lastNavigationCellUid = $(cell).closest("tr").data("uid");
}
return current.call(this, element);
}
})(kendo.ui.Grid.fn.current);
and use it:
kendo.ui.Grid.fn.refocusLastNavigatedCell = function () {
if (this._lastNavigationCellUid) {
var row = $(this.tbody).find("tr[data-uid='" +
this._lastNavigationCellUid + "']");
var cell = $(row).children().eq(this._lastNavigationCellIndex);
this.current(cell);
}
};
You've got so many customizations now, you may want to extend the grid itself instead of replacing its methods one by one.
By the way, you could probably integrate all of this in the refresh method, so you don't have to explicitly call it:
kendo.ui.Grid.fn.refresh = (function (refresh) {
return function (e) {
this._refreshing = true;
refresh.call(this, e);
this._refreshing = false;
if (!this.options.editable) {
this.refocusLastNavigatedCell();
} else {
this.refocusLastEditedCell()
}
}
})(kendo.ui.Grid.fn.refresh);
I didn't understand why you want to refocus
this.tbody.find("tr:last td:last");
so I changed it for the (demo).
I want to check with JavaScript if the user has already opened my website in another tab in their browser.
It seems I cannot do that with pagevisibility...
The only way I see is to use WebSocket based on a session cookie, and check if the client has more than one socket. But by this way, from current tab, I have to ask my server if this user has a tab opened right next to their current browser tab. It is a little far-fetched!
Maybe with localstorage?
The shorter version with localStorage and Storage listener
<script type="text/javascript">
// Broadcast that you're opening a page.
localStorage.openpages = Date.now();
var onLocalStorageEvent = function(e){
if(e.key == "openpages"){
// Listen if anybody else is opening the same page!
localStorage.page_available = Date.now();
}
if(e.key == "page_available"){
alert("One more page already open");
}
};
window.addEventListener('storage', onLocalStorageEvent, false);
</script>
Update:
Works on page crash as well.
Stimulate page crash in chrome: chrome://inducebrowsercrashforrealz
Live demo
Using local storage I created a simple demo that should accomplish what your looking to do. Basically, it simply maintains a count of currently opened windows. When the window is closed the unload events fire and remove it from the total window count.
When you first look at it, you may think there's more going on than there really is. Most of it was a shotty attempt to add logic into who was the "main" window, and who should take over as the "main" window as you closed children. (Hence the setTimeout calls to recheck if it should be promoted to a main window) After some head scratching, I decided it would take too much time to implement and was outside the scope of this question. However, if you have two windows open (Main, and Child) and you close the Main, the child will be promoted to a main.
For the most part you should be able to get the general idea of whats going on and use it for your own implementation.
See it all in action here:
http://jsbin.com/mipanuro/1/edit
Oh yeah, to actually see it in action... Open the link in multiple windows. :)
Update:
I've made the necessary changes to have the the local storage maintain the "main" window. As you close tabs child windows can then become promoted to a main window. There are two ways to control the "main" window state through a parameter passed to the constructor of WindowStateManager. This implementation is much nicer than my previous attempt.
JavaScript:
// noprotect
var statusWindow = document.getElementById('status');
(function (win)
{
//Private variables
var _LOCALSTORAGE_KEY = 'WINDOW_VALIDATION';
var RECHECK_WINDOW_DELAY_MS = 100;
var _initialized = false;
var _isMainWindow = false;
var _unloaded = false;
var _windowArray;
var _windowId;
var _isNewWindowPromotedToMain = false;
var _onWindowUpdated;
function WindowStateManager(isNewWindowPromotedToMain, onWindowUpdated)
{
//this.resetWindows();
_onWindowUpdated = onWindowUpdated;
_isNewWindowPromotedToMain = isNewWindowPromotedToMain;
_windowId = Date.now().toString();
bindUnload();
determineWindowState.call(this);
_initialized = true;
_onWindowUpdated.call(this);
}
//Determine the state of the window
//If its a main or child window
function determineWindowState()
{
var self = this;
var _previousState = _isMainWindow;
_windowArray = localStorage.getItem(_LOCALSTORAGE_KEY);
if (_windowArray === null || _windowArray === "NaN")
{
_windowArray = [];
}
else
{
_windowArray = JSON.parse(_windowArray);
}
if (_initialized)
{
//Determine if this window should be promoted
if (_windowArray.length <= 1 ||
(_isNewWindowPromotedToMain ? _windowArray[_windowArray.length - 1] : _windowArray[0]) === _windowId)
{
_isMainWindow = true;
}
else
{
_isMainWindow = false;
}
}
else
{
if (_windowArray.length === 0)
{
_isMainWindow = true;
_windowArray[0] = _windowId;
localStorage.setItem(_LOCALSTORAGE_KEY, JSON.stringify(_windowArray));
}
else
{
_isMainWindow = false;
_windowArray.push(_windowId);
localStorage.setItem(_LOCALSTORAGE_KEY, JSON.stringify(_windowArray));
}
}
//If the window state has been updated invoke callback
if (_previousState !== _isMainWindow)
{
_onWindowUpdated.call(this);
}
//Perform a recheck of the window on a delay
setTimeout(function()
{
determineWindowState.call(self);
}, RECHECK_WINDOW_DELAY_MS);
}
//Remove the window from the global count
function removeWindow()
{
var __windowArray = JSON.parse(localStorage.getItem(_LOCALSTORAGE_KEY));
for (var i = 0, length = __windowArray.length; i < length; i++)
{
if (__windowArray[i] === _windowId)
{
__windowArray.splice(i, 1);
break;
}
}
//Update the local storage with the new array
localStorage.setItem(_LOCALSTORAGE_KEY, JSON.stringify(__windowArray));
}
//Bind unloading events
function bindUnload()
{
win.addEventListener('beforeunload', function ()
{
if (!_unloaded)
{
removeWindow();
}
});
win.addEventListener('unload', function ()
{
if (!_unloaded)
{
removeWindow();
}
});
}
WindowStateManager.prototype.isMainWindow = function ()
{
return _isMainWindow;
};
WindowStateManager.prototype.resetWindows = function ()
{
localStorage.removeItem(_LOCALSTORAGE_KEY);
};
win.WindowStateManager = WindowStateManager;
})(window);
var WindowStateManager = new WindowStateManager(false, windowUpdated);
function windowUpdated()
{
//"this" is a reference to the WindowStateManager
statusWindow.className = (this.isMainWindow() ? 'main' : 'child');
}
//Resets the count in case something goes wrong in code
//WindowStateManager.resetWindows()
HTML:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JS Bin</title>
</head>
<body>
<div id='status'>
<span class='mainWindow'>Main Window</span>
<span class='childWindow'>Child Window</span>
</div>
</body>
</html>
CSS:
#status
{
display:table;
width:100%;
height:500px;
border:1px solid black;
}
span
{
vertical-align:middle;
text-align:center;
margin:0 auto;
font-size:50px;
font-family:arial;
color:#ba3fa3;
display:none;
}
#status.main .mainWindow,
#status.child .childWindow
{
display:table-cell;
}
.mainWindow
{
background-color:#22d86e;
}
.childWindow
{
background-color:#70aeff;
}
(2021) You can use BroadcastChannel to communicate between tabs of the same origin.
For example, put the following at the top level of your js code, then test by opening 2 tabs:
const bc = new BroadcastChannel("my-awesome-site");
bc.onmessage = (event) => {
if (event.data === `Am I the first?`) {
bc.postMessage(`No you're not.`);
alert(`Another tab of this site just got opened`);
}
if (event.data === `No you're not.`) {
alert(`An instance of this site is already running`);
}
};
bc.postMessage(`Am I the first?`);
I know it is late, but maybe help someone
This snippet of code, will detect how many tabs are open and how many are active (visible) and if none of tabs is active, it will choose last opened tab, as active one.
This code will handle windows/tab crash too and it will refresh the count at crash.
Because localStorage is not supported on Stack Overflow currently, please test here.
<html>
<body>
Open in several tabs or windows
<div id="holder_element"></div>
<script type="text/javascript">
//localStorage.clear();
manage_crash();
//Create a windows ID for each windows that is oppened
var current_window_id = Date.now() + "";//convert to string
var time_period = 3000;//ms
//Check to see if PageVisibility API is supported or not
var PV_API = page_visibility_API_check();
/************************
** PAGE VISIBILITY API **
*************************/
function page_visibility_API_check ()
{
var page_visibility_API = false;
var visibility_change_handler = false;
if ('hidden' in document)
{
page_visibility_API = 'hidden';
visibility_change_handler = 'visibilitychange';
}
else
{
var prefixes = ['webkit','moz','ms','o'];
//loop over all the known prefixes
for (var i = 0; i < prefixes.length; i++){
if ((prefixes[i] + 'Hidden') in document)
{
page_visibility_API = prefixes[i] + 'Hidden';
visibility_change_handler = prefixes[i] + 'visibilitychange';
}
}
}
if (!page_visibility_API)
{
//PageVisibility API is not supported in this device
return page_visibility_API;
}
return {"hidden": page_visibility_API, "handler": visibility_change_handler};
}
if (PV_API)
{
document.addEventListener(PV_API.handler, function(){
//console.log("current_window_id", current_window_id, "document[PV_API.hidden]", document[PV_API.hidden]);
if (document[PV_API.hidden])
{
//windows is hidden now
remove_from_active_windows(current_window_id);
//skip_once = true;
}
else
{
//windows is visible now
//add_to_active_windows(current_window_id);
//skip_once = false;
check_current_window_status ();
}
}, false);
}
/********************************************
** ADD CURRENT WINDOW TO main_windows LIST **
*********************************************/
add_to_main_windows_list(current_window_id);
//update active_window to current window
localStorage.active_window = current_window_id;
/**************************************************************************
** REMOVE CURRENT WINDOWS FROM THE main_windows LIST ON CLOSE OR REFRESH **
***************************************************************************/
window.addEventListener('beforeunload', function ()
{
remove_from_main_windows_list(current_window_id);
});
/*****************************
** ADD TO main_windows LIST **
******************************/
function add_to_main_windows_list(window_id)
{
var temp_main_windows_list = get_main_windows_list();
var index = temp_main_windows_list.indexOf(window_id);
if (index < 0)
{
//this windows is not in the list currently
temp_main_windows_list.push(window_id);
}
localStorage.main_windows = temp_main_windows_list.join(",");
return temp_main_windows_list;
}
/**************************
** GET main_windows LIST **
***************************/
function get_main_windows_list()
{
var temp_main_windows_list = [];
if (localStorage.main_windows)
{
temp_main_windows_list = (localStorage.main_windows).split(",");
}
return temp_main_windows_list;
}
/**********************************************
** REMOVE WINDOWS FROM THE main_windows LIST **
***********************************************/
function remove_from_main_windows_list(window_id)
{
var temp_main_windows_list = [];
if (localStorage.main_windows)
{
temp_main_windows_list = (localStorage.main_windows).split(",");
}
var index = temp_main_windows_list.indexOf(window_id);
if (index > -1) {
temp_main_windows_list.splice(index, 1);
}
localStorage.main_windows = temp_main_windows_list.join(",");
//remove from active windows too
remove_from_active_windows(window_id);
return temp_main_windows_list;
}
/**************************
** GET active_windows LIST **
***************************/
function get_active_windows_list()
{
var temp_active_windows_list = [];
if (localStorage.actived_windows)
{
temp_active_windows_list = (localStorage.actived_windows).split(",");
}
return temp_active_windows_list;
}
/*************************************
** REMOVE FROM actived_windows LIST **
**************************************/
function remove_from_active_windows(window_id)
{
var temp_active_windows_list = get_active_windows_list();
var index = temp_active_windows_list.indexOf(window_id);
if (index > -1) {
temp_active_windows_list.splice(index, 1);
}
localStorage.actived_windows = temp_active_windows_list.join(",");
return temp_active_windows_list;
}
/********************************
** ADD TO actived_windows LIST **
*********************************/
function add_to_active_windows(window_id)
{
var temp_active_windows_list = get_active_windows_list();
var index = temp_active_windows_list.indexOf(window_id);
if (index < 0)
{
//this windows is not in active list currently
temp_active_windows_list.push(window_id);
}
localStorage.actived_windows = temp_active_windows_list.join(",");
return temp_active_windows_list;
}
/*****************
** MANAGE CRASH **
******************/
//If the last update didn't happened recently (more than time_period*2)
//we will clear saved localStorage's data and reload the page
function manage_crash()
{
if (localStorage.last_update)
{
if (parseInt(localStorage.last_update) + (time_period * 2) < Date.now())
{
//seems a crash came! who knows!?
//localStorage.clear();
localStorage.removeItem('main_windows');
localStorage.removeItem('actived_windows');
localStorage.removeItem('active_window');
localStorage.removeItem('last_update');
location.reload();
}
}
}
/********************************
** CHECK CURRENT WINDOW STATUS **
*********************************/
function check_current_window_status(test)
{
manage_crash();
if (PV_API)
{
var active_status = "Inactive";
var windows_list = get_main_windows_list();
var active_windows_list = get_active_windows_list();
if (windows_list.indexOf(localStorage.active_window) < 0)
{
//last actived windows is not alive anymore!
//remove_from_main_windows_list(localStorage.active_window);
//set the last added window, as active_window
localStorage.active_window = windows_list[windows_list.length - 1];
}
if (! document[PV_API.hidden])
{
//Window's page is visible
localStorage.active_window = current_window_id;
}
if (localStorage.active_window == current_window_id)
{
active_status = "Active";
}
if (active_status == "Active")
{
active_windows_list = add_to_active_windows(current_window_id);
}
else
{
active_windows_list = remove_from_active_windows(current_window_id);
}
console.log(test, active_windows_list);
var element_holder = document.getElementById("holder_element");
element_holder.insertAdjacentHTML("afterbegin", "<div>"+element_holder.childElementCount+") Current Windows is "+ active_status +" "+active_windows_list.length+" window(s) is visible and active of "+ windows_list.length +" windows</div>");
}
else
{
console.log("PageVisibility API is not supported :(");
//our INACTIVE pages, will remain INACTIVE forever, you need to make some action in this case!
}
localStorage.last_update = Date.now();
}
//check storage continuously
setInterval(function(){
check_current_window_status ();
}, time_period);
//initial check
check_current_window_status ();
</script>
</body>
</html>
The tutorial at http://www.asp.net/web-forms/tutorials/ajax-control-toolkit/getting-started/creating-a-custom-ajax-control-toolkit-control-extender-vb gives a nice example of a custom extender based on a textbox and a button. Basically the button remains disabled until at least one character is typed into the textbox. If the text is removed from the textbox the button is disabled again.
I am trying to modify this so that the extender is based on a textbox and panel. Again I want the panel to become visible when text is present in a textbox.
This is how I amended code...
Type.registerNamespace('CustomExtenders');
CustomExtenders.ShowHidePanelBehavior = function (element) {
CustomExtenders.ShowHidePanelBehavior.initializeBase(this, [element]);
this._targetPanelIDValue = null;
}
CustomExtenders.ShowHidePanelBehavior.prototype = {
initialize: function () {
CustomExtenders.ShowHidePanelBehavior.callBaseMethod(this, 'initialize');
// Initalization code
$addHandler(this.get_element(), 'keyup',
Function.createDelegate(this, this._onkeyup));
this._onkeyup();
},
dispose: function () {
// Cleanup code
CustomExtenders.ShowHidePanelBehavior.callBaseMethod(this, 'dispose');
},
// Property accessors
//
get_TargetPanelID: function () {
return this._targetPanelIDValue;
},
set_TargetPanelID: function (value) {
this._targetPanelIDValue = value;
},
_onkeyup: function () {
var e = $get(this._targetPanelIDValue);
if (e) {
var visibility = ("" == this.get_element().style.value);
e.visibility = 'visible';
}
}
}
CustomExtenders.ShowHidePanelBehavior.registerClass('CustomExtenders.ShowHidePanelBehavior', Sys.Extended.UI.BehaviorBase);
When run the panel will not appear. No errors are produced.
Where have I gone wrong...
Try this code:
_onkeyup: function () {
var panel = $get(this.get_TargetPanelID());
if (panel) {
var visibilityValue = ("" == this.get_element().value) ? "hidden" : "visible";
panel.style.visibility = visibilityValue;
}
}