We Keep Coding

javascript DOM object (window) extended property is null on page reload after being idle

I have a custom extended property attached to the window object in JavaScript as follows:
Community.js
(function (window, document, $) {
'use strict';
var containerScrollPositionOnHideList = [];
var scrollToTopOnShowContainerList = [];
var userProfileInfo = {};
window.Community = $.extend({
//init
init: function () {
var Site = window.Site;
Site.run();
this.enableHideShowEventTrigger();
},
setUserInfo: function (userObj) {
if (UtilModule.allowDebug) { debugger; }
window.localStorage.setItem('userInfo', JSON.stringify(userObj));
var d = new $.Deferred();
$.when(this.initUserProfile(userObj.UserId)).done(function () {
d.resolve("ok");
});
},
getUserInfo: function () {
var userJson = window.localStorage.getItem('userInfo');
var userObj = JSON.parse(userJson);
return userObj;
},
})(window, document, jQuery);
The problem is that this extension property window.Community is null in certian scenarios when i refresh the page which i am going to describe below along with flow of code.
and here is a module in JavaScript to force reload scripts even if they are cached every time the page is refreshed as my code heavily depends on javascript calls so I just enabled it to make sure while I am still writing the code page reloads every time, the code is below as follows:
Util.js
var UtilModule = (function () {
var allowDebug = false;
var currentVersion = 0;
var properlyLoadScript = function (scriptPath, callBackAfterLoadScript) {
//get the number of `<script>` elements that have the correct `src` attribute
//debugger;
var d = $.Deferred();
$('script').each(function () {
console.log($(this).attr('src'));
});
if (typeof window.Community == 'undefined') {
//debugger;
console.log('community was undefined till this point');
//the flag was not found, so the code has not run
$.when(forceReloadScript(scriptPath)).done(function () {
callBackAfterLoadScript();
d.resolve("ok");
});
}
else {
console.log('Community loaded already and running now : ' + scriptPath);
callBackAfterLoadScript();
}
return d.promise();
};
var forceReloadScript = function (scriptPath) {
if (UtilModule.allowDebug) { debugger; }
var d = $.Deferred();
initCurrentVersion();
var JSLink = scriptPath + "?version=" + currentVersion;
var JSElement = document.createElement('script');
JSElement.src = JSLink;
JSElement.onload = customCallBack;
document.getElementsByTagName('head')[0].appendChild(JSElement);
function customCallBack() {
d.resolve("ok");
}
return d.promise();
};
var enableDebugger = function () {
allowDebug = true;
};
var disableDebugger = function () {
allowDebug = false;
};
var debugBreakPoint = function () {
if (allowDebug) {
}
};
var initCurrentVersion = function () {
if (currentVersion == 0) {
var dt = new Date();
var ttime = dt.getTime();
currentVersion = ttime;
}
};
var getCurrentVersion = function () {
return currentVersion;
};
return {
forceReloadScript,
properlyLoadScript,
enableDebugger,
disableDebugger,
debugBreakPoint,
allowDebug,
getCurrentVersion
};
})();
Note: I have made deferred objects to resolve only when the JSElement.onload has been called successfully. This step was taken just for testing purpose to make sure that I am not missing something before reaching a point to call the method where I am getting an error.
After that the code where I load scripts using UtilModule in my layout file look like as below:
_Layout.cshtml
<script src = "~/Scripts/Application/Modules/Util.js" ></script>
<script>
$.when(
UtilModule.properlyLoadScript('/Scripts/Application/Community.js', () => {
// Community.init() was supposed to be called here but i was still getting the error so i implemented this using promise that is returned from properlyLoadScript and call Community.init() further in .done callback to make sure that script is properly loading till this point.
//window.Community.init();
})
).done(function() {
window.Community.init();
});
</script>
#RenderSection("scripts", required: false)
Now coming to my main file where My index file is executing having (_layout.chsmtl) as parent layout
is
Index.cshtml
#{
ViewBag.Title = "My Blog";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<article id="BlogPage" style="margin: 5px;">
</article>
#section scripts{
<script type="text/javascript">
$(document).ready(function () {
$.when(UtilModule.properlyLoadScript('/Scripts/Application/Modules/Blog.js', () => {
})).done(function () {
BlogModule.init();
});
});
//});
</script>
}
from what I know is that #section scripts is executed only once all the scripts in the layout page are loaded first so seems like a safe place to initialize the code which is dependent on some script in _Layout.HTML file and further enclosed with $(document).ready() for testing just to make sure that this script loads after everything else is loaded already.
Note: I am running all this code in in-cognito mode in chrome so nothing is cached while this code is running
now my Blog.js file looks like as below
var BlogModule = (function () {
var moduleReference = this;
var PageId = "#BlogPage ";
var currentUser;
var BlogPostList = [];
var blogPostInfo = {};
//init
var init = function () {
if (UtilModule.allowDebug) { debugger; }
//This is where the problem happens
console.log(window.Community);
console.log(window.Community.getUserInfo());
currentUser = window.Community.getUserInfo();
initBlogInformation();
//window.Community.registerModule(BlogModule);
if (Object.keys(window.Community.getUserProfileObject()) <= 0) {
$.when(window.Community.initUserProfile(currentUser.UserId)).then(function () {
$.when(initBlogInformation()).done(function () {
//debugger;
console.log(BlogPostList);
window.WidgetManager.populateWidget(PageId, moduleReference);
loadBlogPostWidget();
loadBlogViewWidget();
loadBlogCommentsWidget();
});
});
}
else {
$.when(initBlogInformation()).done(function () {
window.WidgetManager.populateWidget(PageId, moduleReference);
loadBlogPostWidget();
loadBlogViewWidget();
loadBlogCommentsWidget();
});
}
};
var loadBlogIndexMenuWidget = function () {
if (UtilModule.allowDebug) { debugger; }
};
var loadBlogPostWidget = function () {
var widgetOptions = {};
widgetOptions.type = "BlogPostWidget";
widgetOptions.container = PageId + "#BlogPostWidgetContainer";
var settings = {};
settings.UserId = 1;
widgetOptions.settings = settings;
window.WidgetManager.loadWidget(widgetOptions);
}
var loadBlogViewWidget = function () {
var widgetOptions = {};
widgetOptions.type = "BlogViewWidget";
widgetOptions.container = PageId + "#BlogViewWidgetContainer";
var settings = {};
settings.UserId = 1;
widgetOptions.settings = settings;
window.WidgetManager.loadWidget(widgetOptions);
};
var loadBlogCommentsWidget = function () {
var widgetOptions = {};
widgetOptions.type = "BlogCommentsWidget";
widgetOptions.container = PageId + "#BlogCommentsWidgetContainer";
var settings = {};
settings.UserId = 1;
widgetOptions.settings = settings;
window.WidgetManager.loadWidget(widgetOptions);
};
var initBlogList = function () {
$.when(getBlogPosts()).then(function (results) {
if (UtilModule.allowDebug) { debugger; }
BlogPostList = results.Record;
console.log(BlogPostList);
});
};
var getBlogPosts = function () {
if (UtilModule.allowDebug) { debugger; }
var d = new $.Deferred();
var uri = '/Blog/GetBlogPosts?userId=' + currentUser.UserId;
$.post(uri).done(function (returnData) {
if (UtilModule.allowDebug) { debugger; }
if (returnData.Status == "OK") {
BlogPostList = returnData.Record;
BlogPostList.map(x => {
if (UtilModule.allowDebug) { debugger; }
x.UserName = window.Community.getUserProfileObject().UserName;
if (x.Comments != null) {
x.CommentsObject = JSON.parse(x.Comments);
x.CommentsCount = x.CommentsObject.length;
}
});
console.log(returnData.Record);
d.resolve("ok");
} else {
window.Community.showNotification("Error", returnData.Record, "error");
d.resolve("error");
}
});
return d.promise();
};
var initBlogInformation = function () {
//debugger;
var d = $.Deferred();
getBlogPosts().then(getBlogModelTemplate()).then(function () {
d.resolve("ok");
});
return d.promise();
};
//Get Blog Model
var getBlogModelTemplate = function () {
var d = new $.Deferred();
var uri = '/Blog/GetBlogModel';
$.post(uri).done(function (returnData) {
blogPostInfo = returnData.Record;
d.resolve("ok");
});
return d.promise();
};
return {
init: init,
};
})();
The error I have highlighted below
so the problem is in init function of BlogModule which is BlogModule.init() the page is idle for too long and I reload it I get the following error:
cannot call
window.Community.getUserInfo() of undefined implying that community is undefied
after couple of refreshes its fine and the issue doesn't happen unless I change reasonable portion of code for js files to be recompiled again by browser or the browser is idle for too long and I am not able to understand what is triggering this issue.
below is log from console
p.s. error occurs more repeatedly if i refresh page with f5 but happens rarely if i refresh page with ctrl + f5
Please any help would be of great value

Answering my own question, took a while to figure it out but it was a small mistake on my end just fixing the following function in Util.js fixed it for me
var properlyLoadScript = function(scriptPath, callBackAfterLoadScript) {
//get the number of `<script>` elements that have the correct `src` attribute
//debugger;
var d = $.Deferred();
$('script').each(function() {
console.log($(this).attr('src'));
});
if (typeof window.Community == 'undefined') {
//debugger;
console.log('community was undefined till this point');
//the flag was not found, so the code has not run
$.when(forceReloadScript('/Scripts/Application/Community.js')).done(function() {
//debugger;
$.when(forceReloadScript(scriptPath)).done(function() {
callBackAfterLoadScript();
});
d.resolve("ok");
});
} else {
console.log('Community loaded already and running now : ' + scriptPath);
$.when(forceReloadScript(scriptPath)).done(function() {
callBackAfterLoadScript();
});
}
return d.promise();
};

Data not binding as it should be after calling ajax with knockoutjs

I have this grid that i am creating using knockoutjs, it works perfectly at first, now i am using a window.location.hash to run another query, it works too and query returns the correct amount of data however when i insert it within the observableArray (which gets inserted correctly as well), the grid doesn't update the data and shows the old data... I'm using removeAll() function on the observableArray as well before inserting new set of data but it wont update my grid, i suspect there is something wrong with the DOM?
I should mention when i reload the page (since the page's url keeps the hash for query) my grid shows the data and works perfectly. for some reason it needs to reload the page and doesn't work without,
Here is my JS:
if (!ilia) var ilia = {};
ilia.models = function () {
var self = this;
this.pageCount = ko.observable(0);
//this is the observableArray that i am talking about ++++++++
this.items = ko.observableArray();
var $pagination = null;
var paginationConfig = {
startPage: 1,
totalPages: 20,
onPageClick: function (evt, page) {
self.generateHash({ pageNum: page });
self.getData();
}
}
var hashDefault = {
pageNum: 1,
pageSize: 20,
catId: null,
search: ""
}
this.dataModel = function (_id, _name, _desc, _thumb, _ext) {
var that = this;
this.Id = ko.observable(_id);
this.Name = ko.observable(_name);
this.Desc = ko.observable(_desc);
this.Url = '/site/ModelDetail?id=' + _id;
var b64 = "data:image/" + _ext + ";base64, ";
this.thumb = ko.observable(b64 + _thumb);
}
this.generateHash = function (opt) {
//debugger;
var props = $.extend(hashDefault, opt);
var jso = JSON.stringify(props);
var hash = window.location.hash;
var newHash = window.location.href.replace(hash, "") + "#" + jso;
window.location.href = newHash;
return jso;
}
this.parseHash = function () {
var hash = window.location.hash.replace("#", "");
var data = JSON.parse(hash);
if (data)
data = $.extend(hashDefault, data);
else
data = hashDefault;
return data;
}
var _cntrl = function () {
var _hdnCatName = null;
this.hdnCatName = function () {
if (_hdnCatName == null)
_hdnCatName = $("hdnCatName");
return _hdnCatName();
};
var _grid = null;
this.grid = function () {
if (_grid == null || !_grid)
_grid = $("#grid");
return _grid;
}
this.rowTemplate = function () {
return $($("#rowTemplate").html());
}
}
this.createPagnation = function (pageCount, pageNum) {
$pagination = $('#pagination-models');
if ($pagination && $pagination.length > 0)
if (paginationConfig.totalPages == pageCount) return;
var currentPage = $pagination.twbsPagination('getCurrentPage');
var opts = $.extend(paginationConfig, {
startPage: pageNum > pageCount ? pageCount : pageNum,
totalPages: pageCount,
onPageClick: self.pageChange
});
$pagination.twbsPagination('destroy');
$pagination.twbsPagination(opts);
}
this.pageChange = function (evt, page) {
var hash = self.parseHash();
if (hash.pageNum != page) {
self.generateHash({ pageNum: page });
self.getData();
}
}
this.getData = function () {
var _hash = self.parseHash();
inputObj = {
pageNum: _hash.pageNum,
pageSize: _hash.pageSize,
categoryId: _hash.catId
}
//debugger;
//console.log(_hash);
if (inputObj.categoryId == null) {
ilia.business.models.getAll(inputObj, function (d) {
//debugger;
if (d && d.IsSuccessfull) {
self.pageCount(d.PageCount);
self.items.removeAll();
_.each(d.Result, function (item) {
self.items.push(new self.dataModel(item.ID, item.Name, item.Description, item.Thumb, item.Extention));
});
if (self.pageCount() > 0)
self.createPagnation(self.pageCount(), inputObj.pageNum);
}
});
}
else {
ilia.business.models.getAllByCatId(inputObj, function (d) {
if (d && d.IsSuccessfull) {
self.pageCount(d.PageCount);
self.items.removeAll();
console.log(self.items());
_.each(d.Result, function (item) {
self.items.push(new self.dataModel(item.ID, item.Name, item.Description, item.Thumb, item.Extention));
});
// initializing the paginator
if (self.pageCount() > 0)
self.createPagnation(self.pageCount(), inputObj.pageNum);
//console.log(d.Result);
}
});
}
}
this.cntrl = new _cntrl();
};
And Initialize:
ilia.models.inst = new ilia.models();
$(document).ready(function () {
if (!window.location.hash) {
ilia.models.inst.generateHash();
$(window).on('hashchange', function () {
ilia.models.inst.getData();
});
}
else {
var obj = ilia.models.inst.parseHash();
ilia.models.inst.generateHash(obj);
$(window).on('hashchange', function () {
ilia.models.inst.getData();
});
}
ko.applyBindings(ilia.models.inst, document.getElementById("grid_area"));
//ilia.models.inst.getData();
});

Would perhaps be useful to see the HTML binding here as well.
Are there any console errors? Are you sure the new data received isn't the old data, due to some server-side caching etc?
Anyhow, if not any of those:
Are you using deferred updates? If the array size doesn't change, I've seen KO not being able to track the properties of a nested viewmodel, meaning that if the array size haven't changed then it may very well be that it ignores notifying subscribers. You could solve that with
self.items.removeAll();
ko.tasks.runEarly();
//here's the loop
If the solution above doesn't work, could perhaps observable.valueHasMutated() be of use? https://forums.asp.net/t/2056128.aspx?What+is+the+use+of+valueHasMutated+in+Knockout+js

Ad Block Plus Blocking jQuery Script?

I have a script that pulls data from my CMS and then allows a person to vote on a poll. The script works fine. However, I have Ad Block Plus Plugin installed in Firefox. When that is enabled to blocks the script from submitting the form correctly. It appears to submit correctly in the front end but is never registered in the back end.
Why does Ad Block Plus block my script that has nothing to do with ads?
The script is below:
$(document).ready(function () {
var Engine = {
ui: {
buildChart: function() {
if ($("#pieChart").size() === 0) {
return;
}
var pieChartData = [],
totalVotes = 0,
$dataItems = $("ul.key li");
// grab total votes
$dataItems.each(function (index, item) {
totalVotes += parseInt($(item).data('votes'));
});
// iterate through items to draw pie chart
// and populate % in dom
$dataItems.each(function (index, item) {
var votes = parseInt($(item).data('votes')),
votePercentage = votes / totalVotes * 100,
roundedPrecentage = Math.round(votePercentage * 10) / 10;
$(this).find(".vote-percentage").text(roundedPrecentage);
pieChartData.push({
value: roundedPrecentage,
color: $(item).data('color')
});
});
var ctx = $("#pieChart").get(0).getContext("2d");
var myNewChart = new Chart(ctx).Pie(pieChartData, {});
}, // buildChart
pollSubmit: function() {
if ($("#pollAnswers").size() === 0) {
return;
}
var $form = $("#pollAnswers"),
$radioOptions = $form.find("input[type='radio']"),
$existingDataWrapper = $(".web-app-item-data"),
$webAppItemName = $existingDataWrapper.data("item-name"),
$formButton = $form.find("button"),
bcField_1 = "CAT_Custom_1",
bcField_2 = "CAT_Custom_2",
bcField_3 = "CAT_Custom_3",
$formSubmitData = "";
$radioOptions.on("change", function() {
$formButton.removeAttr("disabled"); // enable button
var chosenField = $(this).data("field"), // gather value
answer_1 = parseInt($existingDataWrapper.data("answer-1")),
answer_2 = parseInt($existingDataWrapper.data("answer-2")),
answer_3 = parseInt($existingDataWrapper.data("answer-3"));
if (chosenField == bcField_1) {
answer_1 = answer_1 + 1;
$formSubmitData = {
ItemName: $webAppItemName,
CAT_Custom_1: answer_1,
CAT_Custom_2: answer_2,
CAT_Custom_3: answer_3
};
}
if (chosenField == bcField_2) {
answer_2 = answer_2 + 1;
$formSubmitData = {
ItemName: $webAppItemName,
CAT_Custom_1: answer_1,
CAT_Custom_2: answer_2,
CAT_Custom_3: answer_3
};
}
if (chosenField == bcField_3) {
answer_3 = answer_3 + 1;
$formSubmitData = {
ItemName: $webAppItemName,
CAT_Custom_1: answer_1,
CAT_Custom_2: answer_2,
CAT_Custom_3: answer_3
};
}
prepForm($formSubmitData);
});
function prepForm(formSubmitData) {
$formButton.click(function(e) {
e.preventDefault();
logAnonUserIn("anon", "anon", formSubmitData); // log user in
}); // submit
} // prepForm
function logAnonUserIn(username, password, formSubmitData) {
$.ajax({
type: 'POST',
url: '/ZoneProcess.aspx?ZoneID=-1&Username=' + username + '&Password=' + password,
async: true,
beforeSend: function () {},
success: function () {},
complete: function () {
fireForm(formSubmitData);
}
});
} // logAnonUserIn
function fireForm(formSubmitData) {
// submit the form
var url = "/CustomContentProcess.aspx?A=EditSave&CCID=13998&OID=3931634&OTYPE=35";
$.ajax({
type: 'POST',
url: url,
data: formSubmitData,
async: true,
success: function () {},
error: function () {},
complete: function () {
window.location = "/";
}
});
}
} // pollSubmit
} // end ui
};
Engine.ui.buildChart();
Engine.ui.pollSubmit();
});

As it turns out easylist contains this filter:
.aspx?zoneid=
This is why my script is being blocked.
I was told I can try this exception filter:
##||example.com/ZoneProcess.aspx?*$xmlhttprequest
I could also ask easylist to add an exception.
Answer comes from Ad Block Plus Forums.

Object doesn't support property or method 'save'

I am getting error while calling reportManager.save("/EditInitiatives.svc/SaveGridData"); method
<script type='text/javascript'>
$(function () {
$('#saveReport, #save-report-bottom').click(function () {
$.blockUI({ message: '<h4><img src="/Images/busy.gif" /> Saving your changes.<br/>This operation might impact several reports at once.<br/>Please be patient.</h4>' });
uiController.disableSaveButton();
reportManager.save("/EditInitiatives.svc/SaveGridData");
});
var reportManager = function () {
var tableData = JSON.stringify(handsontable.getData());
var input = JSON.stringify({ "input": tableData });
alert("Data" + input);
save = function(saveUrl) {
alert("save" + saveUrl);
$.ajax({
url: saveUrl,
type: 'POST',
dataType: 'json',
data: input, //returns all cells' data
contentType: 'application/json; charset=utf-8',
success: function(res) {
if (res.result === 'ok') {
console.text('Data saved');
}
$.unblockUI();
},
error: function (xhr) {
alert(xhr.responseText);
}
});
}
};
}
</script>

You can not access it since save is a Global variable and not part of reportManager.
The reason why it is global is because you are missing the var in front of the variable. That puts it into the Global Namespace. It will not magically be hooked up to the block scope of the function. You would need to use an OO approach to get that to work. Some basic ideas are
function Report() {
var x = 1;
this.save = function () {
alert("First: " + x);
}
}
var report = new Report();
report.save();
function report_2() {
var x = 1;
return {
save : function () {
alert("Second: " + x);
}
}
}
var report2 = report_2();
report2.save();
var report_3 = (function () {
var x = 1;
var returnObj = {};
returnObj.save = function () {
alert("Third: " + x);
}
return returnObj;
//return {
// save : function() {
// alert("Third: " + x);
// }
//}
})();
report_3.save();
Fiddle of Examples: http://jsfiddle.net/5Zhsq/

You have declared the save function without var keyword; so it will be declared in global scope not as function of reportManager.
Even if you put the var keyword before save function then it's not accessible from outside of reportManager function scope. to expose it to public you need kinda export it. here is a simple pattern to do it:
var reportManager = (function (self) {
function save(saveUrl) { ... } //this function is not public yet
self.save = save; //we are exporting the save function here
return self; //now we are returning an object with save function
})(reportManager || {});
reportManager.save("your-param-here"); //Now use your function the way you want

scroll display pagination with knockout js

I would like to use knockout js to enable scroll pagination
Problem
I would like to pass in url and id into my `GetPage(controller, id#, page#))
Currently it is hard coded but i would like to change that.
Knockout js
$.views.Roster.GetPage = function (url, id, pageNumber) {
$.grain.Ajax.Get({
Url: url,
SectionID: {id:id},
DataToSubmit: { pageNumber: pageNumber, id: id },
DataType: "json",
OnSuccess: function (data, status, jqXHR) {
$.views.Roster.RosterViewModel.AddUsers(data);
}
});
};
Next = function () {
var _page = $.views.Roster.ViewModel.CurrentPage() + 1;
$.views.Roster.ViewModel.CurrentPage(_page);
$.views.Roster.GetPage("/api/Roster", 9, _page);
}
Scroll pagination
$(document).ready(function(){
$('#main').scroll(function () {
if ($('#main').scrollTop() >= $(document).height() - $('#main').height()) {
$('#status').text('Loading more items...' + $.views.Roster.ViewModel.TotalRoster());
if ($.views.Roster.ViewModel.RosterUsers() == null ) {
$('#status').hide();
$('#done').text('No more items...'),
$('#main').unbind('scroll');
}
setTimeout(updateStatus, 2500);
}
//updateStatus();
});
});

Change the data in getRoster function to what your server function is expecting for you to return the data. Also, remove the code $.views.Roster.GetRoster, it is not required anymore. Now when you do ko.applyBindings(new $.views.Roster.RosterViewModel()); you should get the first page of data, subsequently, when you scroll, the next() call on the view model will continue paging. That logic is all you.
$.views.Roster.RosterViewModel = function (data) {
var self = this;
self.RosterUsers = ko.observableArray([]);
_rosterUsers = self.RosterUsers;
self.currentPage = ko.observable(1);
self.toDisplay = ko.observable(10);
var filteredRoster = ko.computed(function(){
var init = (self.currentPage()-1)* self.toDisplay(),
filteredList = [],
rosterLength = self.RosterUsers().length,
displayLimit = self.toDisplay();
if(rosterLength == 0)
return[];
for(var i = init; i<(displayLimit + init) && i<rosterLength; i++)
{
filteredList.push(self.RosterUsers()[i]);
}
return filteredList;
}),
totalRoster = ko.computed(function () {
return self.RosterUsers().length;
}),
changePage = function (data) {
self.currentPage(data);
},
next = function () {
if ((self.currentPage() * self.toDisplay()) > self.RosterUsers().length)
return;
self.currentPage(self.currentPage() + 1);
},
prev = function () {
if (self.currentPage() === 1)
return;
self.currentPage(self.currentPage() - 1);
},
getRoster = ko.computed(function () {
var data = {
currentPage: self.currentPage(),
pageSize: self.toDisplay()
},
$promise = _makeRequest(data);
$promise.done(function (data) {
var localArray = [];
ko.utils.arrayForEach(data, function(d){
localArray.push(new $.views.Roster.UserViewModel(d));
});
self.RosterUsers.push.apply(self.RosterUsers,localArray);
});
}),
_makeRequest = function(data){
return $.getJSON('your url here', data);
};
};