关键词：
Wikipedia Viewer
----------------
Build a Wikipedia Viewer - freecodecamp
An application that is capable of searching the Wikipedia's entries, and displaying the resulting search entries.
A [Pen](https://codepen.io/harunpehlivan/pen/OQKMMO) by [HARUN PEHLİVAN](https://codepen.io/harunpehlivan) on [CodePen](https://codepen.io).
[License](https://codepen.io/harunpehlivan/pen/OQKMMO/license).
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet" />
<link href="https://codepen.io/U-ways/pen/qNLZrg" rel="stylesheet" />
/* Color Scheme
================================================================================
Main Colors:
#c5dec2 - #95a893
#3e5050 - #3a4949
#263331 - #333
Matching R&G:
#549042 - #8e0000
*//* App
==============================================================================*/
#app-con
margin-top: 10px;
justify-content: flex-start;
align-content: flex-start;
/* Search Section
==============================================================================*/
#search
width: 90vw;
max-width: 1320px;
justify-content: flex-start;
align-content: flex-start;
align-items: flex-start;
margin: 25vh 0 1% 0;
#search h2
color: #c5dec2;
margin: 0 0 2px -10px;
font-size: 1.6em;
#search h2 i
font-size: 1.4em;
font-style: italic;
.ceremony
margin: 0 0 1% 0 !important;
transition: margin 1.5s ease;
/* Search-bar
============================================*/
#search-bar
overflow: hidden;
width: 100%;
white-space: nowrap;
/* Input bar
============================================*/
#search-bar input[type=search]
outline: none;
border: none;
width: 100%;
height: 50px;
background-color: #c5dec2;
color: #3b4c4c;
font-size: 1.5em;
padding-left: 15px;
border-radius: 5px;
float: left;
#search-bar input[type=search]:focus
background: rgba(190, 214, 187, 0.87);
#search-bar input[type=search]::-webkit-input-placeholder
color: #405353;
#search-bar input[type=search]:-ms-input-placeholder
color: #405353;
/* Search button
============================================*/
#search-btn
border-top-right-radius: 4.5px;
border-bottom-right-radius: 4.5px;
font-size: 1.5em;
height: 50px;
width: 55px;
margin-left: -55px;
transition: all .55s ease;
outline: none;
border: none;
background: #324141;
color: #c5dec2;
#search-btn:hover
background: #293535;
/* Random Link
============================================*/
#random
display: block;
padding-top: 5px;
padding-left: 3px;
color: #c5dec2;
#random:hover,
#random:focus
color: #c5dec2;
text-decoration: none;
text-shadow: 0px 1px 8px #969696;
/* Results Container
==============================================================================*/
#results-con
/* Random Heading
==============================================================================*/
#results-heading
width: 90vw;
max-width: 1320px;
margin-bottom: .5%;
color: #bed6bb;
font-weight: 100;
animation: fadeIn 2s;
animation-timing-function: ease-out;
/* Result-list
==============================================================================*/
#result-list
width: 85vw;
max-width: 1250px;
/* Result List Item
============================================*/
.result-list-item
width: inherit;
max-width: inherit;
height: calc(2vh + 30px);
margin-top: .5%;
margin-bottom: .5%;
text-align: left;
border-radius: 3px;
border: 1px solid transparent;
animation: fadeIn 2s;
animation-timing-function: ease-out;
transition:background 1s ease;
.result-list-item:hover
border: 1px solid #a8bda5;
.result-list-item:hover,
.result-list-item:focus
background: #263331;
text-shadow: 0px 1px 8px #969696;
transition: all 1s ease;
@keyframes fadeIn
from
opacity: 0;
to
opacity: 1;
/* Items Components
============================================*/
.item-link
height: inherit;
color: #bed6bb;
text-decoration: none;
justify-content: flex-start;
padding: 0 25px 0 15px;
outline-color: #bed6bb;
.title-link:hover,
.item-link:focus
text-decoration: none;
background: #263331;
text-shadow: 0px 1px 8px #969696;
transition: all 1.2s ease;
.item-icon
font-size: 1em;
font-weight: bold;
.item-title
margin: 0 0 0 15px;
font-weight: bold;
font-size: 1em;
width: auto;
white-space: nowrap;
.item-description
color: #9eb9a6;
font-size: 1em;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
width: auto;
/* Network Error
==============================================================================*/
#NetworkErr
position: absolute;
text-align: center;
top: 45%; bottom: 0;
text-transform: capitalize;
color: #273432;
animation: fadeIn 1s;
<script src="https://codepen.io/U-ways/pen/qNLZrg"></script>
/* jshint esversion:6 */
const searchSection = document.querySelector('#search');
const searchBtn = document.querySelector('#search-btn');
const searchInput = document.querySelector('#search-input');
const resultsCon = document.querySelector('#results-con');
const keypressHandler = (key) =>
/** 13 === Enter Keycode **/
if (key.keyCode === 13) ceremony();
;
/* Add listeners for initial search animation
==============================================================================*/
searchBtn.addEventListener("click", ceremony);
searchInput.addEventListener('keypress', keypressHandler);
/* Remove animation listeners & set normal eventListeners for getting results
==============================================================================*/
function ceremony()
searchBtn.removeEventListener("click", ceremony);
searchInput.removeEventListener('keypress', keypressHandler);
searchSection.classList.add("ceremony");
function eventListeners()
searchBtn.addEventListener("click", getResults);
searchInput.addEventListener('keypress', (key) =>
if (key.keyCode === 13) getResults();
);
getResults();
/** 1.8s delay to match my animation **/
window.setTimeout(eventListeners, 1800);
/* Get results as JSON using XHR.
==============================================================================*/
function getResults()
let keyword = encodeURIComponent(searchInput.value.trim());
let url = `https://en.wikipedia.org/w/api.php?action=opensearch&limit=15&format=json&search=$keyword&origin=*`;
xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.setRequestHeader('Api-User-Agent', 'Header_doest_work_._Update_your_MediaWiki_API_doc_.'); // Include this so Wiki developers can see it. https://www.mediawiki.org/wiki/API:Main_page#Identifying_your_client
xhr.onerror = () => getScriptJsonp(keyword);
xhr.onload = () => resultsHandler(JSON.parse(xhr.response));
xhr.send(null);
/* Display results.
==============================================================================*/
function resultsHandler(response)
/** Clean up from previous queries **/
let results = '';
resultsCon.innerHTML = '';
searchInput.value = '';
if (response[1].length !== 0)
resultsCon.innerHTML += `<h2 id="results-heading">Wikipedia Articles For: <i>$response[0]</i></h2>`;
resultsCon.innerHTML += `<ul id="result-list"></ul>`;
let ul = document.querySelector('#result-list');
response[1].forEach(
(item, index) =>
/** Push all elements inside results first. (To load all at once) **/
results += component(item, index, response)
);
ul.innerHTML += results;
else
resultsCon.innerHTML =
`<h2 id="results-heading">No Resutls Found For: $response[0]</h2>`; // Add animation and style
function component(item, index, results)
return `
<li class="result-list-item flex-r">
<a class="item-link flex-r" href="$results[3][index]" target="_blank">
<i class="fa fa-wikipedia-w item-icon" aria-hidden="true"></i>
<h3 class="item-title">$results[1][index]</h3>
<p class="item-description"><b>:</b> $results[2][index]</p>
</a>
</li>`;
/* JSONP script technique as a CROS error handler.
==============================================================================*/
function getScriptJsonp(keyword)
let script = document.createElement('script');
let url = `https://en.wikipedia.org/w/api.php?action=opensearch&format=json&search=$keyword` + '&callback=wikiJsonpCb';
/**
* Create a window's proparty method with a simillar name to the requested function from
* the Wiki server (wikiJsonpCb) to be used as a callback. This method cleans up the
* JSONP mess and passes the data to cb.
*/
window.wikiJsonpCb = response =>
// Cleaning as we no longer need those elements.
delete window.wikiJsonpCb;
document.body.removeChild(script);
resultsHandler(response); // NOTE: MB try to make resultsHandler handle this one as well...
;
/**
* Set script src to the 'url' + Request a callback to 'wikiJsonpCb'. (JSONP technique)
* When script is set to the body, the server will return a call to 'wikiJsonpCb' with the API query result as a passed argument (JSONP technique)
* window.wikiJsonpCb will handle the rest afterwards.
*/
script.src = url;
script.onerror = connectionErr;
document.body.appendChild(script);
/* Connection error handler.
==============================================================================*/
function connectionErr()
resultsCon.innerHTML = '<h2 id="NetworkErr">Unable to connect to the intrenet, Please check your network connection</h2>';
/* Adding project Details
==============================================================================*/
addProjDetails(0, 'Project Overview', 'This is a Wikipedia viewer application. Consider it something similar to the google search engine, it uses the Wikimedia API to search through the Wikipedia entries, then it displays a sum of the results with a brief description for each title.');
addProjDetails(0, 'Techniques/Technologies', 'This project had no complex components. AJAX was used for better client-side interactivity, and HTML and CSS was used for structure and presentation. I added some decent on search, hover, and display animation for a better UX.');
addProjDetails(1, 'Hurdles encountered', 'The Wikimedia API (the core for my search engine) had some outdated and misleading documentation. So I had a bit of trouble following the instruction provided, as they were incorrect.');
addProjDetails(1, 'Future implementations', 'I am interested into integrating caching functionality to the application. So if the user searched a keyword before, it should not request it again form the server. Instead, it should use the cached results for a faster and more efficient processing.');
#container
header#header.grid.cols-6
section#proj-heading
h1 Wikipedia Viewer Application
details#proj-details
summary Project Info
section#details-body.grid.cols-2.rows-2
.details-column
.details-column
main#app
#app-con.flex-c
section#search.flex-c
h2
i.fa.fa-wikipedia-w.item-icon
| ikipedia Viewer
#search-bar
input#search-input autocomplete="off" autofocus="" placeholder=("Search The Wikipedia...") type="search" /
button#search-btn type="button"
i.fa.fa-search
a#random href="https://en.wikipedia.org/wiki/Special:Random" target="_blank" Random Article
section#results-con.flex-c
footer#footer
p
| Last Updated:
time datetime="2017-05-03" 03/05/2017
|   |  
a href="https://codepen.io/harunpehlivan" target="_blank"
i.fa.fa-codepen aria-hidden="true"
| HARUN PEHLİVAN
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