Hopefully a quick question.
I'm using a JSON file to write out some html and populate with variables from the JSON and append it to part of my html file. This works and is fine. However, I now want to use a different script to apply show and hide filters based on class attributes to the html that has been printed. For some reason, this isn't working. If I just copy and paste the html with variables back into the original document after its been printed out, then the script works though. Is this an issues of synchronicity?
Here's the second script I'm looking to execute if it helps:
$(document).ready(function(){
var targets = $('.filter'),
buttons = $('.filter-button');
buttons.click(function(){
var value = $(this).data('filter');
if(value == "all")
{
buttons.removeClass('checked');
targets.show();
}
else
{
if($(this).hasClass('checked'))
{
$(this).removeClass('checked');
var checkedClasses = buttons.filter('.checked').toArray().map(function(btn){return $(btn).data('filter');});
if(checkedClasses.length == 0)
{
buttons.removeClass('checked');
targets.show();
}
else
{
checkedClasses = $.grep(checkedClasses, function(n, i){ return n != value }),
selector = '.' + checkedClasses.join('.'),
show = targets.filter(selector);
targets.not(show).hide();
show.show();
}
}
else
{
$(this).addClass('checked');
var checkedClasses = buttons.filter('.checked').toArray().map(function(btn){return $(btn).data('filter');}),
selector = '.' + checkedClasses.join('.'),
show = targets.filter(selector);
targets.not(show).hide();
show.show();
}
}
});
});
I am using LiveChat on my website and trying to show a div if no agents are available, using their guide here
Javascript
LC_API.on_after_load = function() {
if (LC_API.agents_are_available()) {
$("#ChatLink2").hide();
} else {
$("#ChatLink2").show();
}
};
HTML
<div class='ChatLink2' id='ChatLink2'>Currently Unavailable</div>
However, the div ChatLink2 is not showing when no agents are available
It appears to be race conditions with both LiveChat and JQuery. Below checks for LC availability and uses vanilla JS instead of jQuery.
Also included state change callback if agents go offline after init.
var waitForLC = setInterval(function () {
if (window.LC_API === undefined) {
return;
}
clearInterval(waitForLC);
var showUnavailableStatus = function(show){
var statusDiv = document.getElementById("ChatLink2");
var style = show ? "block" : "none";
statusDiv.style.display = style;
}
LC_API.on_after_load = function() {
if (LC_API.agents_are_available()) {
showUnavailableStatus(false);
} else {
showUnavailableStatus(true);
}
};
LC_API.on_chat_state_changed = function(data) {
showUnavailableStatus(data.state==="offline");
};
}, 100);
I'm making some Adobe Bridge (CS 5.1) plugins.
My problem is that I cannot figure out how to ensure that their respective menu items will be greyed out unless the user has selected valid items for the script.
I can reach the desired state by coding something like
function greyOutMenu () {
var doc = application.document;
var these = [];
these = doc.selections;
menuItem.enabled = true;
if ( these.length < 1 ) {
menuItem.enabled = false;
return;
}
for ( var i in these ) {
if ( these[i] /* is invalid */ ) { menuItem.enabled = false;
return;
}
}
but how do I get this check to run directly when the menu is opened? If I use
myMenu.onSelect = greyOutMenu();
It just runs the check on startup instead of when the menu is opened!
Okay, I figured out what was wrong. I have changed it to...
function greyOutMenu () {
var doc = app.document;
var here = doc.presentationPath;
var thisFolder = Folder ( here );
if ( decodeURI ( thisFolder.name ) === "correct folder name" ) { menuItem.enabled = true; }
else { menuItem.enabled = false; }
if (!app.document.selectionsLength > 0 ) { menuItem.enabled = false; }
}
menuItem.onDisplay = greyOutMenu;
I could have sworn that I had already tried menuItem.onDisplay, but I must have made a syntax error.
Also, In my case it is enough to be in the right folder and have something selected, as the files are added directly by a camera. More complex checks are instead added to the function itself, to prevent stuttering every time the menu is opened.
I have a view in which I have a kendo-grid, in this grid there is a button to open a detail window. When the button is pressed the detail window opens which is a kendo-window which renders a partial view. When I close the kendo-window I destroy it and set it to null. However I have a JavaScript function on both my view and my partial view that catches the input of a scanner. If I scan while the window with the partial view is open the function on the view does nothing, however when I close the partial view the JavaScript function on the partial view still catches my scans and it tries to process the scan for both pages at once. How can I make sure the partial view is really closed so that it doesn't catch my scan input (preferably with JavaScript).
Partial view action method:
public ActionResult GetKendoWindow(int ID, int PID)
{
//fill and return partial view locationswindow
ViewBag.ID = ID;
ViewBag.PID = PID;
IEnumerable<BinLocationItemModel> model = dbLogic.getItemLocations(PID, ID);
return PartialView("_PartialViewLocation", model);
}
Kendo-window:
function showDetails(e) {
e.preventDefault();
if (wnd) {
wnd.close();
}
var dataItem = this.dataItem($(e.currentTarget).closest("tr"));
wndOpen = 1;
$("#detcont").append("<div id='Details'></div>");
wnd = $("#Details").kendoWindow({
width: "60%",
height: "60%",
actions: ["Minimize", "Maximize", "Close"],
title: "Location Data for: " + dataItem.ArticleID,
content: {
url: "GetKendoWindow",
type: "GET",
data: { ID: dataItem.LineNum, PID: dataItem.PickID }
},
close: function (e) {
wnd.destroy();
wnd = null;
setWindowInactive();
}
}).data("kendoWindow");
wnd.center().open();
}
function setWindowInactive(e) {
wndOpen = 0;
}
Partial View JS:
<script type="text/javascript">
//Scanner opvangen
$(document).ready(function () {
if ($('#ItemLocGrid') != null) {
var pressed = false;
var chars = [];
var grid = $('#ItemLocGrid').data('kendoGrid');
var dataitem = grid.dataItem(grid.select());
$(window).keypress(function (e) {
if (e.which >= 48 && e.which <= 57) {
if (chars.length < 3) {
// do nothing
} else {
$('.focus :input').focus();
}
chars.push(String.fromCharCode(e.which));
}
if (pressed == false) {
setTimeout(function () {
if (chars.length >= 5) {
var barcode = chars.join("");
document.getElementById("txtBarcodes").value = barcode;
$('.focus :input').submit();
}
chars = [];
pressed = false;
document.getElementById("txtBarcodes").value = "";
}, 200);
}
pressed = true;
});
}
});
$('#txtBarcodes').submit(function (e) {
var grid = $("#ItemLocGrid").data("kendoGrid");
var dataSource = $("#ItemLocGrid").data("kendoGrid").dataSource;
var allData = grid.dataSource.data();
var code = this.value;
var notification = $("#notification").data("kendoNotification");
console.log("Nothing to see here");
})
Empty your html inside Details div:
close: function (e) {
. . .
$("#Details").html("");
. . .
}
What is return PartialView("_PartialViewLocation", model); doing, is just returning generated html, from your partial view.
UPDATE
The real problem here is, that you should avoid referencing any scripts in partials. So you need to define a section somewhere in your Layout, for example just before the closing </body>, which will allow views (not partial) to include some custom scripts. Then in the view (not partial) you can override this section to include custom scripts:
#section scripts {
<script src="#Url.Content("~/Scripts/Custom.js")" type="text/javascript"></script>
}
It wasn't exactly like SeM mentioned but his code gave me the idea which fixed it. What I did was put my JavaScript code from my partial view into my view(instead of the layout), I didn't realize my view would be able to read a kendo-grid without actually containing it in its code but it actually can. After that it was just a matter of checking if the window is open and processing a scan for either the partial view or the view.
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>