I have an AngularJS frontent app, where I am using angular-loading-overlay library. The problem is that it doesn't show me my spinner.
I have a template with an assigned controller:
<div ng-controller="FooCtrl" data-ng-init="initFoo()">
<div class="bs-loading-container" bs-loading-overlay="FOO" bs-loading-overlay-template-url="/static/spinner.html">
... here some ng-repeat, data for it is loading inside initFoo();
</div>
</div>
The controller itself:
app.controller("FooCtrl", ['$scope', '$http', 'bsLoadingOverlayService',
function ($scope, $http, bsLoadingOverlayService) {
$scope.initFoo = function () {
bsLoadingOverlayService.start({referenceId: 'FOO'});
$http.get("/model").then(function (response) {
// some long-loading data
});
bsLoadingOverlayService.stop({referenceId: 'FOO'});
};
}]);
CSS fragment:
.bs-loading-container {
position: relative;
}
spinner.html itself is some div with text inside (I have simplified it for testing purposes):
<div style="position: absolute; width: 100%; height: 100%; top: 0; left: 0; background-color: rgba(255,255,255,0.7);">
<h1>Please, wait...</h1>
</div>
There is no errors in console. The method initFoo() works fine, it loads a data and the data is drawn in the page after it is loaded fine. But during loading no spinner appears.
Furthermore, if I deliberately change bs-loading-overlay-template-url to improper path, then I receive errors in console. That means, I guess, that library angular-loading-overlay itself was loaded well.
I know that it is always very specific, but may be any ideas what could I miss and what should I check?
Your problem is that you are showing the overlay, and hiding it instantly
$http.get is a asynchronous. so you should hide the overlay inside the handler methods. Try this:
$scope.initFoo = function () {
bsLoadingOverlayService.start({referenceId: 'FOO'});
$http.get("/model").then(function (response) {
// some long-loading data
bsLoadingOverlayService.stop({referenceId: 'FOO'});
});
};
Related
Please consider the following hidden div element. I am using it as a hidden element to construct the PDF contents and trying to download as PDF.
HTML elements declared as below.
<div id="griddata" style="display:none;">
<div id="reportHeader" style="display:none;">
Consider other elements that I want to show in the PDf here
</div>
</div>
And below is the Kendo Export chart as PDF code, Which I will call through the LoadPDF function.
function LoadPDF() {
try {
$("#griddata").show();
$("#reportHeader").show();
if ($("#chartDiv").html() != null && $("#griddata").html() != '') {
setTimeout(function () {
kendo.drawing.drawDOM($("#griddata"))
.then(function (group) {
// Render the result as a PDF file
return kendo.drawing.exportPDF(group, {
paperSize: "auto",
margin: { left: "1cm", top: "1cm", right: "1cm", bottom: "1cm" }
});
})
.done(function (data) {
// Save the PDF file
kendo.saveAs({
dataURI: data,
fileName: window.sessionStorage.getItem('XXXName') + ".pdf",
proxyURL: "/Account/Export"
});
$("#reportHeader").hide();
$("#griddata").hide();
});
}, 2000);
}
}
catch (e) {
$("#reportHeader").hide();
$("#griddata").hide();
UMGenerateAlert('Error while exporting data');
}
finally {
}
}
The above method works fine, but the problem is, before exporting the "griddata" div elements as PDF, I am forced to ENABLE the div. Otherwise the exported PDF returns no data. This causing the "griddata" div to appear on the screen till the PDF gets exported and gets hidden once the document is downloaded.
Please suggest me how we can handle this, without displaying it in the UI.
Try CSS Print Media Query:
#media print {
/* All your print styles go here */
#header, #footer, #nav { display: none !important; }
#griddata, #reportHeader { display: block !important; }
}
Or the old way:
<link href="/print.css" rel="stylesheet" media="print" type="text/css" />
Regarding the grid part, have you already tried using visibility: hidden;? since the space and dimensions of the element are preserved.
If I were you, I would just show an overlay layer with a loading progress bar that covers the grid area and hide it after finish hidding the grid.
Anyway, display: none is still part of the DOM, I'll update my answer if there is a workaround.
I just came across similar question myself couple days ago and got it working based on this answer, which is to overlay your pdf div with another div. Here render-pdf is the div where your kendo pdf gets loaded.
<div id="pdf-with-overlay" style="position: relative; width: 100%;">
<div id="render-pdf"></div>
<div id="pdf-overlay" style="width:100%;height:100%;position: absolute;top:0;left:0;z-index:10;"></div>
</div>
PS. In the scenario I mention I do an overlay instead of hiding, as found hiding also has some limitations e.g. if you want to draw pdf to canvas, hidden one will show no content.
I have been trying to get a report that we have built with jasperreports and rendered via visualize.js to be centered horizontally on a page (regardless of the page or browser dimensions).
My current code is:
<!DOCTYPE html>
<html>
<head>
<script src="https://mobiledemo.jaspersoft.com/jasperserver-pro/client/visualize.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mootools/1.5.1/mootools-core-full-compat.min.js"></script>
<script type='text/javascript'>
window.addEvent('load', function() {
visualize({
auth: {
name: "joeuser",
password: "joeuser",
organization: "organization_1"
}
}, function(v) {
//render dashboard from provided resource
v("#container").report({
resource: "/public/Samples/Reports/06g.ProfitDetailReport",
scale: "container",
error: handleError
});
//show error
function handleError(err) {
alert(err.message);
}
});
});
</script>
<style>
html,
body {
height: 100%;
width: 100%;
margin: 0 auto;
background-color: #000000;
}
#container {
display: block;
width: 100%;
height: 100%;
border: 0px;
margin: 0 auto;
background: blue;
}
</style>
</head>
<body>
<div id="container"></div>
</body>
</html>
The following fiddle should show the current issue:
https://jsfiddle.net/g207h68x/
If you resize the result window, you can see that as the report is scaled (via the scale:"container" entry in the render function it sticks to the left of the screen.
I can't use any specific sizes for the <div> as each dashboard has their own unique dimensions depending on what is being displayed in the report or dashboard (some may be 300x500 and others may be up to 1920x1080).
I have tried to wrap the <div> inside flexboxes which didn't seem to help..unless I was not doing it correctly (entirely possible).
Another approach was to try and nest the div within a parent div, but that didn't seem to work either (again, I may have not done it correctly either).
I have also tried to make the <div> an inline-block, but that seems to throw off the scaling entirely for visualize.js as it reads the container dimensions (I think).
I looked into the visualize.js documentation, but there is really not much there for dynamic sizing and spacing on the page.
I even tried to put the <div> within a table...but that didn't seem to help as the table cells would just span across the page or container.
I did read somewhere that the JQuery UI can be used to further manipulate what visualize.js is doing, but I could not find any examples or references on where that was documented.
If anyone knows how to center this type of content, I would greatly appreciate your input.
Thank you in advance.
The centering does not work in your jsfiddle because the report gets scaled inside the container and its transform-origin is set to top left. To overcome most of the issues I have come up with the following script based on the one you posted.
The main idea is to add some margins to the ".jrTable" table with the beforeRender event, then to intercept the CSS transform-origin from within visualize.js and set the new one.
Please note that this is not a complete script and does not work on some narrow window setups. I did not run it on a dashboard either.
You will have to decide when to set this new origin based on some measurements. Also, the jQuery's cssHook will probably need adjustments for different vendor prefixes if you intend to target other browsers. I tested it only in Chrome and Safari with the default one. More info on jQuery cssHooks.
EDIT: It seems that the initial solution based on changing the margin and the transform-origin produces unpredictable results and does not scale correctly in all cases. Keeping it for reference here, though.
Better results can be achieve just by adjusting the offset after the transform-origin is applied:
window.addEvent('load', function() {
var hookRegistered = new $.Deferred();
var $container = $("#container");
function adjustPageOffset($jrPage) {
var pageWidth = $jrPage[0].getBoundingClientRect().width,
containerWidth = $container.width();
(pageWidth<containerWidth) ? $jrPage.offset({left:(containerWidth-pageWidth)/2}) : $jrPage.offset({left:0});
}
__visualize__.require(["jquery"], function($) {
$.cssHooks["transformOrigin"] = {
set: function( elem, value ) {
elem.style["transformOrigin"] = value;
if ($(elem).is(".jrPage") && "top left" === value) {
adjustPageOffset($(elem));
}
}
};
hookRegistered.resolve();
});
// wait for the hook to register in visualize's embedded jQuery
// then load the report
hookRegistered.then(function() {
visualize({
auth: {
name: "joeuser",
password: "joeuser",
organization: "organization_1"
}
}, function (v) {
//render dashboard from provided resource
v("#container").report({
resource: "/public/Samples/Reports/06g.ProfitDetailReport",
scale: "container",
error: handleError
});
//show error
function handleError(err) {
alert(err.message);
}
});
});
});
And the modified jsfiddle.
I'm using a callback function after an animation, and I'm getting a result that I don't understand.
The reader's current_state should increase by 1, then the reader should move right, and then this should repeat 3 more times.
When I run the program using my web inspector, I see that the current_state does indeed increase before moving each step. However, in my browser window I only see the reader's text change values during the first step. So when the program ends, I see a 2 in the reader's text on my screen, but the value of the reader's current_state is actually 5.
To perplex me even more, I was tinkering around and added a random button with an empty click event attached. Hitting this button will make the current_state appear as the reader's text on the screen. So if I repeatedly click this button while the program runs, it looks perfect.
I'm not looking for an entirely different way to do this, as this isn't my actual code, just an example to illustrate the issue. In my code I'm trying to stick to using angular and a recursive callback function after an animation, if it's possible to fix this issue.
Thanks in advance, this has been driving me crazy!
https://jsfiddle.net/snookieordie/ns09cvqc/7/
var app = angular.module("turingApp", []);
app.controller("turingController", ["$scope", function ($scope) {
$scope.reader = {
current_state: 1,
}
$scope.run_program = function() {
if($scope.reader.current_state < 5) {
$scope.reader.current_state++;
$(".reader").animate({"left": "+=50px"}, 1000, function() {
$scope.run_program();
});
}
}
}]);
CSS:
.reader {
position: relative;
height: 50px;
width: 50px;
left: 0px;
font-size: 35px;
background-color: coral;
}
HTML:
<body ng-app="turingApp" ; ng-controller="turingController">
<div class="reader">{{reader.current_state}}</div>
<br/><br/>
<input type="button" class="code_submit" value="Run Code" ng-click="run_program()" />
<br/><br/>
<input type="button" value="Empty Click Event" ng-click="" />
</body>
Use $scope.apply() just after animate call back function is being called, Below I have edited js code
var app = angular.module("turingApp", []);
app.controller("turingController", ["$scope", function($scope) {
$scope.reader = {
current_state: 1,
}
$scope.run_program = function() {
if ($scope.reader.current_state < 5) {
$scope.reader.current_state++;
$(".reader").animate({"left": "+=50px"}, 1000, function() {
$scope.run_program();
$scope.$apply(); // Have added this line onlye
});
}
}
}]);
Why this is needed? actually angular has watchers concept and when you are doing this complex kind of functionality watchers need to keep deep eye on variable changes, which is not present auto to achieve speed, but can be added/enhanced manually.
I want to use a spinner which I can show during some of the rest api calls for a better UX. I have come across many existing github projects which does exactly similar things.
https://github.com/cgross/angular-busy
https://github.com/urish/angular-spinner
But I'm not able to use any of the existing projects. I think before I start writing something of my own, I want to know if things which I'm looking for can be done using these projects or any other existing project.
Requirement:
During some of the rest api calls like uploading images, fetching some data, deleting images, etc, I want to show a spinner with background faded. Once I have the result, I can show the background again and remove the spinner.
I want to use this spinner with start/stop from my controller not from my html.
I don't want this spinner for all the xhr requests by default.
I think angular-busy demo does solves most of the above requirements except that it needs a promise param in html. Is there anyway by which I can control the start/stop dynamically from my controller rather than giving a promise.
Angular-spinner demo is good but it doesn't fade out background. Is there any way to fade out background ?
Can anyone give me some pointers how exactly can I solve my problem ?
I always create my own spinner with this logic:
js:
app.directive('ngSpinnerBar', ['$rootScope',
function ($rootScope) {
return {
link: function (scope, element, attrs) {
// by defult hide the spinner bar
element.addClass('hide');
// count how many time requests were sent to the server
// so when they all done the spinner will be removed
scope.counter = 0;
$rootScope.$on('$stateNetworkRequestStarted', function () {
scope.counter++;
element.removeClass('hide'); // show spinner bar
// $('body').addClass('page-on-load');
});
$rootScope.$on('$stateNetworkRequestEnded', function () {
scope.counter--;
if (scope.counter <= 0) {
scope.counter = 0;
element.addClass('hide'); // show spinner bar
// $('body').removeClass('page-on-load'); // remove page loading indicator
}
});
}
};
}
])
html:
<div ng-spinner-bar></div>
As you can see every time i send a request to the api i show the spinner (css create the spinning - link) and when result come back i send event to hide the spinner.
if you want to make things easier for you, you should create a service which send all the api requests (wrap $http). that way you can ensure every request will show the spinner.
EDIT
the first result in google gave me this - fade background in angular
It seems like http://bsalex.github.io/angular-loading-overlay/_site/ fits the requirements.
For example:
var app = angular.module('app-http-integration-with-reference-id-and-matchers', [
'bsLoadingOverlay',
'bsLoadingOverlayHttpInterceptor'
])
.factory('randomTextInterceptor', function(bsLoadingOverlayHttpInterceptorFactoryFactory) {
return bsLoadingOverlayHttpInterceptorFactoryFactory({
referenceId: 'random-text-spinner',
requestsMatcher: function(requestConfig) {
return requestConfig.url.indexOf('hipsterjesus') !== -1;
}
});
})
.factory('randomUserInterceptor', function(bsLoadingOverlayHttpInterceptorFactoryFactory) {
return bsLoadingOverlayHttpInterceptorFactoryFactory({
referenceId: 'random-user-spinner',
requestsMatcher: function(requestConfig) {
return requestConfig.url.indexOf('randomuser') !== -1;
}
});
})
.config(function($httpProvider) {
$httpProvider.interceptors.push('randomTextInterceptor');
$httpProvider.interceptors.push('randomUserInterceptor');
}).run(function($sce, bsLoadingOverlayService) {
bsLoadingOverlayService.setGlobalConfig({
/*
It is only an example, don't use this url in production.
Copy this template to your code base or use integration with Spin.js (see Docs & Examples)
*/
templateUrl: $sce.trustAsResourceUrl('https://raw.githubusercontent.com/bsalex/angular-loading-overlay/gh-pages/_site/loading-overlay-template.html')
});
});
app.controller('HttpIntegrationWithReferenceIdAndMatchersController', function($scope, $http, $sce, bsLoadingOverlayService) {
$scope.randomText = $sce.trustAsHtml('Fetch result here');
$scope.randomUser = undefined;
$scope.fetchRandomText = function() {
$http.get('http://hipsterjesus.com/api/')
.success(function(data) {
$scope.randomText = $sce.trustAsHtml(data.text);
})
.error(function() {
$scope.randomText = $sce.trustAsHtml('Can not get the article');
});
};
$scope.fetchRandomUser = function() {
$http.get('https://randomuser.me/api/')
.success(function(data) {
$scope.randomUser = data.results[0];
});
};
});
.random-result {
display: flex;
height: 170px;
margin-top: 1em;
}
.random-result__text,
.random-result__user {
position: relative;
overflow: auto;
border: 2px dashed #C00;
flex: 1;
margin: 0.5em;
padding: 0.5em;
text-align: center;
}
.user__photo {
width: 100px;
height: 100px;
border-radius: 50%;
margin: 0;
}
.user__name {
font-size: 1.5em;
margin: 0.5em;
padding: 0;
text-align: center;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.0/angular.min.js"></script>
<script src="https://rawgit.com/bsalex/angular-loading-overlay/master/dist/angular-loading-overlay.js"></script>
<script src="https://rawgit.com/bsalex/angular-loading-overlay-http-interceptor/master/dist/angular-loading-overlay-http-interceptor.js"></script>
<div ng-app="app-http-integration-with-reference-id-and-matchers">
<div ng-controller="HttpIntegrationWithReferenceIdAndMatchersController">
<div class="well well-lg bs-loading-container">
<button ng-click="fetchRandomText()">Fetch random text</button>
<button ng-click="fetchRandomUser()">Fetch random user</button>
<div class="random-result">
<div class="random-result__text" bs-loading-overlay bs-loading-overlay-reference-id="random-text-spinner" bs-loading-overlay-delay="3000">
<p ng-bind-html="randomText"></p>
</div>
<div class="random-result__user user" bs-loading-overlay bs-loading-overlay-reference-id="random-user-spinner" bs-loading-overlay-delay="3000">
<div ng-if="randomUser">
<img ng-src="{{randomUser.picture.large}}" alt="" class="user__photo" />
<p class="user__name">
{{randomUser.name.first}} {{randomUser.name.last}}
</p>
</div>
</div>
</div>
</div>
</div>
</div>
In the snippet above I've used integration with $http service. It matches requests and shows spinner with specified referenceId.
Also, the following features are available:
You can show and hide spinners from controllers injecting bsLoadingOverlayService and calling bsLoadingOverlayService.start(); and bsLoadingOverlayService.stop();;
You can wrap Promises to show and hide spinners with bsLoadingOverlayService.wrap();
You can create preconfigured handlers (bsLoadingOverlayService.createHandler({referenceId: 'handler-overlay'});), to keep options in one place and then just call preconfiguredHandler.start(); and preconfiguredHandler.stop();
In angularjs 1.2 operations like filtering an ng-repeat with many rows (>2,000 rows) can become quite slow (>1 sec).
I know I can optimize execution times using limitTo, pagination, custom filters, etc. but I'm still interested to know if it's possible to show a loading animation while the browser is busy running long scripts.
In case of angular I think that could be invoked whenever $digest is running because that seems to be the main function that takes up most time and might be called several times.
In a related question there were no useful answers given. Any help greatly appreciated!
The problem is that as long as Javascript is executing, the UI gets no chance to update. Even if you present a spinner before filtering, it will appear "frozen" as long as Angular is busy.
A way to overcome this is to filter in chunks and, if more data are available, filter again after a small $timeout. The timeout gives the UI thread a chance to run and display changes and animations.
A fiddle demonstrating the principle is here.
It does not use Angular's filters (they are synchronous). Instead it filters the data array with the following function:
function filter() {
var i=0, filtered = [];
innerFilter();
function innerFilter() {
var counter;
for( counter=0; i < $scope.data.length && counter < 5; counter++, i++ ) {
/////////////////////////////////////////////////////////
// REAL FILTER LOGIC; BETTER SPLIT TO ANOTHER FUNCTION //
if( $scope.data[i].indexOf($scope.filter) >= 0 ) {
filtered.push($scope.data[i]);
}
/////////////////////////////////////////////////////////
}
if( i === $scope.data.length ) {
$scope.filteredData = filtered;
$scope.filtering = false;
}
else {
$timeout(innerFilter, 10);
}
}
}
It requires 2 support variables: $scope.filtering is true when the filter is active, giving us the chance to display the spinner and disable the input; $scope.filteredData receives the result of the filter.
There are 3 hidden parameters:
the chunk size (counter < 5) is small on purpose to demonstrate the effect
the timeout delay ($timeout(innerFilter, 10)) should be small, but enough to give the UI thread some time to be responsive
the actual filter logic, which should probably be a callback in real life scenarios.
This is only a proof of concept; I would suggest refactoring it (to a directive probably) for real use.
Here are the steps:
First, you should use CSS animations. No JS
driven animations and GIFs should be used within heavy processes bec. of the single thread limit. The animation will freeze. CSS animations are separated from the UI thread and they are supported on IE 10+ and all major browsers.
Write a directive and place it outside of your ng-view with
fixed positioning.
Bind it to your app controller with some special flag.
Toggle this directive's visibility before and after long/heavy processes.
(You can even bind a text message to the directive to display some
useful info to the user). -- Interacting with this or anything else directly within a loop of heavy process will take way longer time to finish. That's bad for the user!
Directive Template:
<div class="activity-box" ng-show="!!message">
<img src="img/load.png" width="40" height="40" />
<span>{{ message }}</span>
</div>
activity Directive:
A simple directive with a single attribute message. Note the ng-show directive in the template above. The message is used both to toggle the activity indicator and also to set the info text for the user.
app.directive('activity', [
function () {
return {
restrict: 'EA',
templateUrl: '/templates/activity.html',
replace: true,
scope: {
message: '#'
},
link: function (scope, element, attrs) {}
};
}
]);
SPA HTML:
<body ng-controller="appController">
<div ng-view id="content-view">...</div>
<div activity message="{{ activityMessage }}"></div>
</body>
Note that the activity directive placed outside of ng-view. It will be available on each section of your single-page-app.
APP Controller:
app.controller('appController',
function ($scope, $timeout) {
// You would better place these two methods below, inside a
// service or factory; so you can inject that service anywhere
// within the app and toggle the activity indicator on/off where needed
$scope.showActivity = function (msg) {
$timeout(function () {
$scope.activityMessage = msg;
});
};
$scope.hideActivity = function () {
$timeout(function () {
$scope.activityMessage = '';
}, 1000); // message will be visible at least 1 sec
};
// So here is how we do it:
// "Before" the process, we set the message and the activity indicator is shown
$scope.showActivity('Loading items...');
var i;
for (i = 0; i < 10000; i += 1) {
// here goes some heavy process
}
// "After" the process completes, we hide the activity indicator.
$scope.hideActivity();
});
Of course, you can use this in other places too. e.g. you can call $scope.hideActivity(); when a promise resolves. Or toggling the activity on request and response of the httpInterceptor is a good idea too.
Example CSS:
.activity-box {
display: block;
position: fixed; /* fixed position so it doesn't scroll */
z-index: 9999; /* on top of everything else */
width: 250px;
margin-left: -125px; /* horizontally centered */
left: 50%;
top: 10px; /* displayed on the top of the page, just like Gmail's yellow info-box */
height: 40px;
padding: 10px;
background-color: #f3e9b5;
border-radius: 4px;
}
/* styles for the activity text */
.activity-box span {
display: block;
position: relative;
margin-left: 60px;
margin-top: 10px;
font-family: arial;
font-size: 15px;
}
/* animating a static image */
.activity-box img {
display: block;
position: absolute;
width: 40px;
height: 40px;
/* Below is the key for the rotating animation */
-webkit-animation: spin 1s infinite linear;
-moz-animation: spin 1s infinite linear;
-o-animation: spin 1s infinite linear;
animation: spin 1s infinite linear;
}
/* keyframe animation defined for various browsers */
#-moz-keyframes spin {
0% { -moz-transform: rotate(0deg); }
100% { -moz-transform: rotate(359deg); }
}
#-webkit-keyframes spin {
0% { -webkit-transform: rotate(0deg); }
100% { -webkit-transform: rotate(359deg); }
}
#-o-keyframes spin {
0% { -o-transform: rotate(0deg); }
100% { -o-transform: rotate(359deg); }
}
#-ms-keyframes spin {
0% { -ms-transform: rotate(0deg); }
100% { -ms-transform: rotate(359deg); }
}
#keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(359deg); }
}
Hope this helps.
Use spin.js and the site http://fgnass.github.com/spin.js/ shows the step which is quite easy.
the loading animation is in CSS which separated from the UI thread and therefore loaded smoothly.
What you can do is detect the end of the ngRepeat as this post says.
I'll do something like, in the controller:
$scope.READY = false;
And in the directive, as the post above says, I'll do something like:
if (scope.$last) {
$scope.READY = true;
}
And you can have a css based loader/spinner with
<div class="loader" ng-show="!READY">
</div>
Ofcourse you can also have css based animations which are independent of js execution.
You could run the filter in another thread using WebWorkers, so your angularjs page won't block.
If you don't use webworkers the browser could get a javascript execution timeout and stop your angular app completely and even if you don't get any timeout your application freezes until the calculation is done.
UPDATE 23.04.14
I've seen a major performance improvement in a large scale project using scalyr and bindonce
Here is an working example :-
angular
.module("APP", [])
.controller("myCtrl", function ($scope, $timeout) {
var mc = this
mc.loading = true
mc.listRendered = []
mc.listByCategory = []
mc.categories = ["law", "science", "chemistry", "physics"]
mc.filterByCategory = function (category) {
mc.loading = true
// This timeout will start on the next event loop so
// filterByCategory function will exit just triggering
// the show of Loading... status
// When the function inside timeout is called, it will
// filter and set the model values and when finished call
// an inbuilt $digest at the end.
$timeout(function () {
mc.listByCategory = mc.listFetched.filter(function (ele) {
return ele.category === category
})
mc.listRendered = mc.listByCategory
$scope.$emit("loaded")
}, 50)
}
// This timeout is replicating the data fetch from a server
$timeout(function () {
mc.listFetched = makeList()
mc.listRendered = mc.listFetched
mc.loading = false
}, 50)
$scope.$on("loaded", function () { mc.loading = false })
})
function makeList() {
var list = [
{name: "book1", category: "law"},
{name: "book2", category: "science"},
{name: "book1", category: "chemistry"},
{name: "book1", category: "physics"}
]
var bigList = []
for (var i = 0; i <= 5000; i++) {
bigList = bigList.concat(list)
}
return bigList
}
button {
display: inline-block;
}
<html>
<head>
<title>This is an Angular Js Filter Workaround!!</title>
</head>
<body ng-app="APP">
<div ng-controller="myCtrl as mc">
<div class = "buttons">
<label>Select Category:- </label>
<button ng-repeat="category in mc.categories" ng-click="mc.filterByCategory(category)">{{category}}</button>
</div>
<h1 ng-if="mc.loading">Loading...</h1>
<ul ng-if="!mc.loading">
<li ng-repeat="ele in mc.listRendered track by $index">{{ele.name}} - {{ele.category}}</li>
</ul>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.5/angular.min.js"></script>
</body>
<html>
Promise/deferred can be used in this case, you can call notify to watch the progress of your code, documentation from angular.js: https://code.angularjs.org/1.2.16/docs/api/ng/service/$q
Here is a tutorial on heavy JS processing that uses ng-Promise: http://liamkaufman.com/blog/2013/09/09/using-angularjs-promises/, hope it is helpful.
//app Factory for holding the data model
app.factory('postFactory', function ($http, $q, $timeout){
var factory = {
posts : false,
getPosts : function(){
var deferred = $q.defer();
//avoiding the http.get request each time
//we call the getPosts function
if (factory.posts !== false){
deferred.resolve(factory.posts);
}else{
$http.get('posts.json')
.success(function(data, status){
factory.posts = data
//to show the loading !
$timeout(function(){
deferred.resolve(factory.posts)
}, 2000);
})
.error(function(data, status){
deferred.error('Cant get the posts !')
})
};
return deferred.promise;
},
getPost : function(id){
//promise
var deferred = $q.defer();
var post = {};
var posts = factory.getPosts().then(function(posts){
post = factory.posts[id];
//send the post if promise kept
deferred.resolve(post);
}, function(msg){
deferred.reject(msg);
})
return deferred.promise;
},
};
return factory;
});
You can use this code taken from this url:
http://www.directiv.es/angular-loading-bar
there you can find a workin demo also.
Here is thei code:
<!DOCTYPE html>
<html ng-app="APP">
<head>
<meta charset="UTF-8">
<title>angular-loading-bar example</title>
<link rel="stylesheet" type="text/css" href="/application/html/js/chieffancypants/angular-loading-bar/loading-bar.min.css"/>
<style>
body{
padding:25px;
}
</style>
</head>
<body ng-controller="ExampleController">
<button id="reloader" ng-click="getUsers()">Reload</button>
<ul ng-repeat="person in data">
<li>{{person.lname}}, {{person.fname}}</li>
</ul>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.0-rc.2/angular.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.2.0-rc.2/angular-animate.min.js"></script>
<script src="/application/html/js/chieffancypants/angular-loading-bar/loading-bar.min.js"></script>
<script>
angular.module('APP', ['chieffancypants.loadingBar', 'ngAnimate']).
controller("ExampleController",['$scope','$http',function($scope,$http){
$scope.getUsers = function(){
$scope.data=[];
var url = "http://www.filltext.com/?rows=10&fname={firstName}&lname={lastName}&delay=3&callback=JSON_CALLBACK"
$http.jsonp(url).success(function(data){
$scope.data=data;
})
}
$scope.getUsers()
}])
</script>
</body>
</html>
How do I use it?
Install it via npm or bower
$ npm install angular-loading-bar
$ bower install angular-loading-bar
To use, simply include it as a dependency in your app and you're done!
angular.module('myApp', ['angular-loading-bar'])