Ionic

How To Build Production and Release Version of Ionic App

To make the production and release version of Android app using Ionic run:

ionic cordova build ios --prod --release

This should run the same as the expanded version:

ionic cordova build ios --minifycss --optimizejs --minifyjs --release

You may need to run with sudo in front of the command if you have permission issues.

For iOS builds the –release flag does not seem to do anything in my testing. I could not find any official documentation explaining what this flag does to iOS builds.

For more detail visit the ionic documentation on building
https://ionicframework.com/docs/cli/commands/cordova-build

How To Blur Popup Background in Ionic/Angular

How To Blur Popup Background in Ionic/Angular using manual method:

To achieve this in Ionic 1, you need to set the main div’s class (that is displayed in the background of your popup) to use the blur css class .

CSS:

// css file 

.blur{
  -webkit-filter: blur(2px);
  -moz-filter: blur(2px);
  -o-filter: blur(2px);
  -ms-filter: blur(2px);
  filter: blur(2px);
}

HTML:

//In your html set the main div of your app to use a dynamic class
 
<div ng-class="blurClass"></div>

JS Controller:


//In JS file set the blur variable to the blur class
 
$scope.blurClass = "blur";

// when done just set the blur to false

$scope.blurClass = false;

How To Open $ionicPopover Popup from Controller

How To Open $ionicPopover from Controller programmatically without a mouse click event:


var self = this; // store reference to 'this' controller object

this.openCustomPopover = function ($event) {

        $event = document.getElementsById('myElementID'); // html element ID 

        $ionicPopover.fromTemplateUrl('popovers/myhtmlpopover.html', {
                scope: $scope
            }).then(function (popover) {
                console.log('in the popover then function');
                self.popover = popover;
                self.popover.show($event);
            });
        }

You can call this function from your controller without a true click event, by faking the $event object.

How to Display and Format Code Snippets on WordPress

How to Display and Format Code Snippets on WordPress ?

What I use is Pretty print, and it’s very simple to setup.

1. Include this script in your header run_prettify.js

2. Start your code with the pre tag

<pre class="prettyprint">
class Voila {
public:
  // Voila
  static const string VOILA = "Voila";

  // will not interfere with embedded tags.
}
</pre>

More information at https://github.com/google/code-prettify

How to Dynamically Load Dark Mode CSS with JavaScript

How to Dynamically Load Dark Mode CSS in your Website or WebApp (Ionic, React, or Angular):

1. Create the two separete css files, one for dark colors and one for bright
2. Upload those to your server to css folder
3. Use the script example below to load the appropriate css file based on the hours in the day.


function loadcssfile(filename, filetype){
    if (filetype=="css"){ //check filename is an external CSS file
        var fileref=document.createElement("link");
        fileref.setAttribute("rel", "stylesheet");
        fileref.setAttribute("type", "text/css");
        fileref.setAttribute("href", filename);
    }
    if (typeof fileref!="undefined")
        document.getElementsByTagName("head")[0].appendChild(fileref);
}

var date = new Date();

 if (date.getHours() >= 19 || date.getHours() <= 7) // after 7pm before 7am
	loadcssfile("../css/darkmode.css", "css");
 else
	loadcssfile("../css/lightmode.css", "css");

Don't blind your readers at night -_-

If you want to incorporate sunset and sunrise you can look into Suncal library, but you will have to request user's location which is always rude and not recommended.

How to Capture Enter View Event in Directive in Ionic/Angular

How to Capture Page View Enter Event in Directive in Ionic 1 Angular 2?

Directives do not get the normal $ionicView.enter events like controllers. You have to register for the parent view event using $ionicParentView.enter. 

$scope.$on("$ionicParentView.enter", function (event, data) {
    // will fire enter event in your directive              
});

Note: Do not import $ionicParentView into your directive, this will cause your code to break.

Good luck!

How to Find Visible HTML Element by class in JavaScript

How to Find Visible HTML Element by class in JavaScript?

We can use the same logic jQuery uses with this code:

element.offsetWidth > 0 && element.offsetHeight > 0;

You can simply go through the list of your class elements to find the one currently displayed.

for (var i = 0; i < document.getElementsByClassName('myclass').length; i++) 
{
   if (document.getElementsByClassName('myclass')[i].offsetWidth > 0 &&
       document.getElementsByClassName('myclass')[i].offsetHeight > 0) 
       {
           //found the visible element of class 'myclass'
            break;
       }
}