Remo Lötscher loetscher

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics

elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
elem.getClientRects(), elem.getBoundingClientRect()

scrollIntoViewIfNeeded 4 everyone!!!

This gist provides a simple JavaScript implementation of the non-standard WebKit method scrollIntoViewIfNeeded that can be called on DOM elements.

Usage

Just use the code in index.js in your app or website. You can see usage in the test page test.html.

The parent element will only scroll if the element being called is out of the view. The boolean can force the element to be centered in the scrolling area.

	import lombok.extern.slf4j.Slf4j;
	import lombok.val;
	import org.springframework.http.HttpStatus;
	import org.springframework.http.MediaType;
	import org.springframework.web.filter.OncePerRequestFilter;
	import org.springframework.web.util.ContentCachingRequestWrapper;
	import org.springframework.web.util.ContentCachingResponseWrapper;

	import javax.servlet.FilterChain;
	import javax.servlet.ServletException;

	// Adapted from https://gist.github.com/int128/e47217bebdb4c402b2ffa7cc199307ba

	package com.elvtn.logging;

	import org.slf4j.Logger;
	import org.slf4j.LoggerFactory;
	import org.springframework.http.HttpStatus;
	import org.springframework.http.MediaType;
	import org.springframework.jmx.export.annotation.ManagedOperation;
	import org.springframework.jmx.export.annotation.ManagedResource;

	package demo.plain;

	import org.keycloak.OAuth2Constants;
	import org.keycloak.admin.client.CreatedResponseUtil;
	import org.keycloak.admin.client.Keycloak;
	import org.keycloak.admin.client.KeycloakBuilder;
	import org.keycloak.admin.client.resource.RealmResource;
	import org.keycloak.admin.client.resource.UserResource;
	import org.keycloak.admin.client.resource.UsersResource;
	import org.keycloak.representations.idm.ClientRepresentation;