Implemented ladders

src/components/app.jsx

@@ -4,6 +4,7 @@ import { BrowserRouter, Switch, Route } from 'react-router-dom';
 //include pages
 import Home from './pages/home.jsx';
 import Profile from './pages/profile.jsx';
+import Ladder from './pages/ladder.jsx';
 import PasswordReset from './pages/password_reset.jsx'
 import PageNotFound from './pages/page_not_found.jsx';
 
@@ -23,6 +24,7 @@ export default class App extends React.Component {
 					<Switch>
 						<Route exact path='/' component={Home} />
 						<Route path='/profile' component={Profile} />
+						<Route path='/ladder' component={Ladder} />
 						<Route path='/passwordreset' component={PasswordReset} />
 						<Route path='*' component={PageNotFound} />
 					</Switch>

src/components/pages/ladder.jsx

@@ -0,0 +1,79 @@
+import React from 'react';
+
+import CommonLinks from '../panels/common_links.jsx';
+import PagedLadder from '../panels/paged_ladder.jsx';
+
+class Ladder extends React.Component {
+	constructor(props) {
+		super(props);
+		this.state = {
+			start: 0,
+			length: 50,
+			fetch: null
+		};
+	}
+
+	componentDidUpdate() {
+		this.state.fetch();
+	}
+
+	render() {
+		let ButtonHeader = this.buttonHeader.bind(this);
+
+		return (
+			<div className='page'>
+				<h1 style={{textAlign: 'center', fontSize: '50px', margin: '30px'}}>KINGDOM BATTLES!</h1>
+
+				<div className='sidePanelPage'>
+					<div className='sidePanel'>
+						<CommonLinks />
+					</div>
+
+					<div className='mainPanel'>
+						<ButtonHeader />
+						<PagedLadder start={this.state.start} length={this.state.length} getFetch={this.getFetch.bind(this)} onReceived={this.onReceived.bind(this)} />
+						<ButtonHeader />
+					</div>
+				</div>
+			</div>
+		);
+	}
+
+	buttonHeader() {
+		return (
+			<div className='table'>
+				<div className='row'>
+					<button className='col' onClick={this.decrement.bind(this)}>{'< Back'}</button>
+					<div className='col' />
+					<div className='col' />
+					<button className='col' onClick={this.increment.bind(this)}>{'Next >'}</button>
+				</div>
+			</div>
+		);
+	}
+
+	increment() {
+		this.setState({
+			start: this.state.start + this.state.length
+		});
+	}
+
+	decrement() {
+		this.setState({
+			start: Math.max(0, this.state.start - this.state.length)
+		});
+	}
+
+	//bound callbacks
+	getFetch(fn) {
+		this.setState({ fetch: fn });
+	}
+
+	onReceived(data) {
+		if (data.length === 0) {
+			this.decrement();
+		}
+	}
+}
+
+export default Ladder;

src/components/panels/paged_ladder.jsx

@@ -0,0 +1,66 @@
+import React from 'react';
+import { withRouter, Link } from 'react-router-dom';
+import PropTypes from 'prop-types';
+
+class PagedLadder extends React.Component {
+	constructor(props) {
+		super(props);
+		this.state = {
+			data: {}
+		}
+
+		if (props.getFetch) {
+			props.getFetch(this.fetchLadder.bind(this));
+		}
+
+		this.fetchLadder();
+	}
+
+	render() {
+		return (
+			<div className='table'>
+				<div className='row'>
+					<p className='col'>Username</p>
+					<p className='col'>Soldiers</p>
+					<p className='col'>Recruits</p>
+					<p className='col'>Gold</p>
+				</div>
+				{Object.keys(this.state.data).map((key) => <div key={key} className={'row'}> <Link to={`/profile?username=${this.state.data[key].username}`} className={'col'}>{this.state.data[key].username}</Link><p className={'col'}>{this.state.data[key].soldiers}</p><p className={'col'}>{this.state.data[key].recruits}</p><p className={'col'}>{this.state.data[key].gold}</p><hr /></div> )}
+			</div>
+		);
+	}
+
+	fetchLadder(start = this.props.start, length = this.props.length) {
+		//build the XHR
+		let xhr = new XMLHttpRequest();
+
+		xhr.onreadystatechange = () => {
+			if (xhr.readyState === 4) {
+				if (xhr.status === 200) {
+					let data = JSON.parse(xhr.responseText);
+					this.setState({data: data});
+
+					if (this.props.onReceived) {
+						this.props.onReceived(data);
+					}
+				}
+			}
+		}
+
+		xhr.open('POST', '/ladderrequest', true);
+		xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8');
+		xhr.send(JSON.stringify({
+			start: start,
+			length: length
+		}));
+	}
+}
+
+PagedLadder.propTypes = {
+	start: PropTypes.number.isRequired,
+	length: PropTypes.number.isRequired,
+	getFetch: PropTypes.func,
+	onReceived: PropTypes.func
+};
+
+export default withRouter(PagedLadder);