ionic3-Image-Cache

A rewrite of Ionic Image Loader library that fixes the SVG issues, local URL detection and base64 detection yet maintaining all other major features. This Ionic plugin also includes features such as image preview. Hats of to @riron for Image viewer

Ionic Module that loads images in a background thread and caches them for later use. Uses FileTransfer from cordova-plugin-filetransfer, and cordova-plugin-file via ionic-native wrappers. This module helps to save Http requests to the server all the time thereby saving bandwidth and other HTTP related issues.

Features

• Downloads images via a native thread. Images will download faster and they will not use the Webview's resources.
• Preview images on click or tap - (can be disabled)
• Caches images for later use. Remote URLs are counter matched with the file system file and returned.
• Shows a loading spinner while the images are loading. (can be disabled and customised with other spinner names in ionic)
• Allows setting a fallback image to be displayed in case the image you're trying to show doesn't exist on the web. (optional)
• Works with the WKWebView Engine (iOS), as the images are copied to the temporary directory, which is accessible form within the WebView

Installation

1. Install the NPM Package

npm install --save ionic3-image-cache

2. Install Required Plugins and Dependency

npm i --save @ionic-native/file
ionic cordova plugin add cordova-plugin-file

npm install --save @ionic-native/file-transfer
ionic cordova plugin add cordova-plugin-file-transfer

npm install --save ionic-img-viewer

3. Import IonicImageCacheModule module

Add IonicImageCacheModule.forRoot() in your app's root module

import {IonicImageCacheModule} from 'ionic3-image-cache';

// import the module
@NgModule({
  ...
  imports: [
    IonicImageCacheModule.forRoot()
  ]
})
export class AppModule {}

Usage

Basic Usage

This HTML code demonstrates basic usage of this module:

<ionic-image-cache [src]="this.sender.profile_image.url"></ionic-image-cache>

<ionic-image-cache [isAvatar]="'true'" [showPreview]="'false'" (tap)="whatever($event)" [src]="this.sender.profile_image.url" class="img-circle"></ionic-image-cache>

You can also listen to the load event to be notified when the image has been loaded:

<ionic-image-cache [src]="this.sender.profile_image.url" (loaded)="onImageLoad($event)"></ionic-image-cache>

...

onImageLoad(data) { // do something with the loader }

## HTML attributes
The `<ionic-image-cache>` component takes many attributes that allows you to customize the image. You can use the following table as a reference:

Attribute Name	Type	Description	Default Value
src	string	The image URL	N/A
isAvatar	boolean	Sets an avatar image as a placeholder rather than image placeholder	false
showPreview	boolean	Displays a full screen version of the image with gestures.	true
imgCssClass	string	You can inject css classes to the image	N/A
highResSrc	string	Set a highres image to use for image preview on click when showPreview is set to true	Original Src
fallbackUrl	string	Sets a custom placeholder image Url while awaiting cache load	N/A
spinnerName	string	Set a spinner name from the list of ionic spinners list	dots
spinnerColor	string	Set a spinner color from your variable set at variables.scss e.g primary	Default
alt	string	Sets an alternative text when image fails on browser	N/A
enableSpinner	boolean	Enable or disable spinner	true

Note: Upcoming features. Please contribute your features.

• Typescript options from controller
• Clear cache
• Max cache settings
• Cache lifespan

Contribution

• Having an issue? or looking for support? Open an issue and we will get you the help you need.
• Got a new feature or a bug fix? Fork the repo, make your changes, and submit a pull request.

Support this project

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