angular-render-html-once

This library helps to keep HTML string rendered once, even if they originally were rendered server-side.

Whenever rendering would occur, and HTML string has already been rendered, resulting DOM elements will be re-used.

This is quite important when integrating angular app with external code maintained by some other library.

Usage

enabing/disabling

One-time rendering is enabled by default. If you wish to disable it permanently, use RenderHtmlOnceComponent.disable() static method - it will prevent from caching/using cache from now on. Complementary static method RenderHtmlOnce.enable() will enable it again.

bootstrap (optional)

Call no-argument static method RenderHtmlOnceComponent.registerServerSideRenderedComponents() wherever applicable (eg. in your application module's constructor) to have it scan for any server-side rendered components that could be already used.

Important: this needs to be done before any angular rendering occurs, since first thing angular does is clearing any existing content of root DOM element.

Component

• use <render-html-once> component wherever you would normally use [innerHtml] directive
• inputs:
  • id required - plain old HTML id attribute; required to match components whenever they could be destroyed and created again (or created from scratch browser-side and match them with their server-side rendered counterparts)
  • htmlContent required - HTML content string you wish to have embedded within component
  • cacheable (optional; default: true) - allows enabling/disabling caching of specific <render-html-once> instance; turning it off in runtime also clears instance-related cache

Requirements

• angular ^8.0.0