coldboot.js

A lightweight vanillaJs script to connect server-rendered static HTML to client-rendered application

Functionality

• show an unhideable loader when certain elements are clicked
• save user input between static state and interactive state //todo see if user 'focus' needs to be preserved

Usage

install the package using npm

npm install coldboot

load the coldboot.js script in your page

<script async src="/node_modules/coldboot/dist/coldboot.min.js" onload="coldboot.init()" type="text/javascript"></script>

we expose coldboot on window which has 2 methods init & complete.

coldboot.init needs to be called to start listening to user events, and takes 2 parameters customLoaderId,customTextContainerId these ids determine the element to show and the element where loader text is to be injected.

in markup , we can now add attributes cb-await='loader text' & cb-await-id='loaderId' to add a loader with custom text, the id provided in cb-await-id is provided to the client application so that it can perform relevant actions.

add the attribute cb-persist='uniqueIdentifier' to add a listener that will listen to 'input' events & store the value property of the element.

once client application is finished loading, it must call coldboot.complete(). doing this wil detach event listeners, hide the loader, update values for client rendered cb-persist based on their unique identifiers.

coldboot.complete() will also return an object with the map of all persisted-identifier to value in the preserve key & the id provided in cb-await-id in the awaitId key to indicate which element was clicked.

if an interaction is observed, then the object will have the following form

{
awaitId:'submit',
preserve: { email:'[email protected]'}
}

if no interaction is observed, then the object returned would be

{
awaitId : undefined,
preserve: {}
}

Optionally you can also subscribe to coldboot.onComplete().then(fn) if you want to listen to complete on multiple places. When a valid element is present, it resolves with value -

{
awaitId:'submit',
preserve: { email:'[email protected]'}
}

coldboot.onComplete is resolved after coldboot.complete() is called.