WordPress Highlight Lookups Tutorial

WordPress Highlight Lookups Tutorial

We’re back at WordPress TwentyTen theme header.php change methodologies to implement some new WordPress functionality like yesterday’s WordPress Plugin Primer Tutorial in that highlighted text of a webpage is used (except that we’ve now opened it up to the non-admin WordPress blog webpages), but this time presenting an overlayed floating set of hyperlink options linking to …

• Wikipedia
• Google Translate
• Free Dictionary
• Google Search
• Tag Search
• Category Search
• Tag First Word Search
• Posting Title Search

As far as header.php code goes we add this Javascript …

<script type=’text/javascript’>

var hight=' ';

function lfhlater() {
var aswq=document.getElementsByTagName("a");
for (var iaswq=0; iaswq<aswq.length; iaswq++) {
if (aswq[iaswq].innerHTML == 'Long hover help available.') {
aswq[iaswq].innerHTML='Highlighting and long hover help.';
aswq[iaswq].title+=' ... also note that Highlighting Webpage Contents allows for Wikipedia, Google Translate, Free Dictionary and Google Search functionalities to appear';
}
}
}

function lookforhighlight() {
var usualdelay=2000, oRange=null, oRect=null, s_top='0px', s_left='5px', fourhundred=300, isfx='0';
if (hight == ' ') {
setTimeout(lfhlater, 5000);
hight='';
}
setTimeout(lookforhighlight, usualdelay);
var xsel=window.getSelection().toString();
if (xsel.length == 0) {
try {
xsel=document.selection.createRange().htmlText;
xsel=xsel.replace(String.fromCharCode(10),' ').replace(String.fromCharCode(10),' ').replace(String.fromCharCode(10),' ').replace(String.fromCharCode(10),' ');
xsel=xsel.replace(String.fromCharCode(13),' ').replace(String.fromCharCode(13),' ').replace(String.fromCharCode(13),' ').replace(String.fromCharCode(13),' ');
} catch(ertw) {
xsel='';
}
} else {
xsel=xsel.replace(String.fromCharCode(10),' ').replace(String.fromCharCode(10),' ').replace(String.fromCharCode(10),' ').replace(String.fromCharCode(10),' ');
xsel=xsel.replace(String.fromCharCode(13),' ').replace(String.fromCharCode(13),' ').replace(String.fromCharCode(13),' ').replace(String.fromCharCode(13),' ');
if (xsel != hight && xsel != '') {
oRange = window.getSelection().getRangeAt(0); //get the text range
oRect = oRange.getBoundingClientRect();
s_top = ('' + oRect.top).replace('px','') + 'px';
s_left = ('' + oRect.left).replace('px','') + 'px';
if (s_top != '0px') {
fourhundred=eval('' + s_top.replace('px',''));
s_top='0px';
var dse='', dde='';
if (document.scrollingElement) {
if (document.scrollingElement.scrollTop) {
dse=('' + document.scrollingElement.scrollTop);
}
}
if (document.documentElement) {
if (document.documentElement.scrollTop) {
dde=('' + document.documentElement.scrollTop);
}
}
if (dse != '') {
fourhundred+=eval('' + dse.replace('px',''));
isfx='0';
} else if (dde != '') {
fourhundred+=eval('' + dde.replace('px',''));
isfx='0';
} else if (('' + window.scrollY) != '') {
fourhundred+=eval('' + ('' + window.scrollY).replace('px',''));
isfx='0';
} else if (('' + window.pageYOffset) != '') {
fourhundred+=eval('' + ('' + window.pageYOffset).replace('px',''));
isfx='0';
} else {
isfx=('' + document.body.scrollTop).replace('px','');
if (isfx.replace('0','') == '') {
isfx=('' + document.scrollingElement.scrollTop).replace('px','');
if (isfx.replace('0','') == '') {
isfx=('' + window.scrollY).replace('px','');
if (isfx.replace('0','') == '') {
isfx=('' + window.pageYOffset).replace('px','');
}
}
}
}
fourhundred+=100;
}
}
}
if (xsel != hight && xsel != '') {
hight=xsel;
if (s_top == '0px') { s_top = ('' + eval(fourhundred + eval('' + isfx))) + 'px'; }
if (document.getElementById('hfloater')) {
if (document.getElementById('hfloater').innerHTML == '') {
document.getElementById('hfloater').style.position='absolute';
document.getElementById('hfloater').style.top=s_top;
document.getElementById('hfloater').style.left=s_left;
document.getElementById('hfloater').style.zIndex='87';
document.getElementById('hfloater').style.backgroundColor='rgba(255,165,0,0.9)';
document.getElementById('hfloater').style.border='1px solid purple';
document.getElementById('hfloater').style.padding='2px 2px 2px 2px';
document.getElementById('hfloater').style.display='block';
document.getElementById('hfloater').innerHTML='<b>Wikipedia <a style="inline-block;" href="//wikipedia.org/wiki/Main_Page" title="//wikipedia.org/wiki/" target=_blank onmouseover="this.href=this.title + hight.replace(/\ /g,' + "'_'" + ');" ontouchstart="this.href=this.title + hight.replace(/\ /g,' + "'_'" + ');" id=b_hfloater_wikipedia>' + hight + '</a></b><br>';
document.getElementById('hfloater').innerHTML+='<b>Google Translate <a style="inline-block;" href="//translate.google.com" title="//translate.google.com/#view=home&op=translate&sl=auto&tl=en&text=" target=_blank onmouseover="this.href=this.title + encodeURIComponent(hight);" ontouchstart="this.href=this.title + encodeURIComponent(hight);" id=b_hfloater_google_translate>' + hight + '</a></b><br>';
document.getElementById('hfloater').innerHTML+='<b>Free Dictionary <a style="inline-block;" href="//www.thefreedictionary.com/" title="//www.thefreedictionary.com/" target=_blank onmouseover="this.href=this.title + hight.replace(/\ /g,' + "'+'" + ');" ontouchstart="this.href=this.title + hight.replace(/\ /g,' + "'+'" + ');" id=b_hfloater_free_dictionary>' + hight + '</a></b><br>';
document.getElementById('hfloater').innerHTML+='<b>Google Search <a style="inline-block;" href="//www.google.com/" title="//www.google.com/search?q=" target=_blank onmouseover="this.href=this.title + hight.replace(/\ /g,' + "'+'" + ');" ontouchstart="this.href=this.title + hight.replace(/\ /g,' + "'+'" + ');" id=b_hfloater_google_search>' + hight + '</a></b><br>';
document.getElementById('hfloater').innerHTML+='<b>Tag Search <a style="inline-block;" href="//www.rjmprogramming.com.au/ITblog/" title="//www.rjmprogramming.com.au/ITblog/tag/" target=_blank onmouseover="this.href=this.title + hight.replace(/\ /g,' + "'-'" + ');" ontouchstart="this.href=this.title + hight.replace(/\ /g,' + "'-'" + ');" id=b_hfloater_tag_search>' + hight + '</a></b><br>';
document.getElementById('hfloater').innerHTML+='<b>Category Search <a style="inline-block;" href="//www.rjmprogramming.com.au/ITblog/" title="//www.rjmprogramming.com.au/ITblog/category/" target=_blank onmouseover="this.href=this.title + hight.replace(/\ /g,' + "'-'" + ');" ontouchstart="this.href=this.title + hight.replace(/\ /g,' + "'-'" + ');" id=b_hfloater_category_search>' + hight + '</a></b><br>';
document.getElementById('hfloater').innerHTML+='<b>Tag First Word Search <a style="inline-block;" href="//www.rjmprogramming.com.au/ITblog/" title="//www.rjmprogramming.com.au/ITblog/tag/" target=_blank onmouseover="this.href=this.title + hight.replace(/\ /g,' + "'-'" + ').replace(' + "'-','/?wopenall='" + ');" ontouchstart="this.href=this.title + hight.replace(/\ /g,' + "'-'" + ').replace(' + "'-','/?wopenall='" + ');" id=b_hfloater_tag_first_word_search>' + hight + '</a></b><br>';
document.getElementById('hfloater').innerHTML+='<b>Posting Title Search <a style="inline-block;" href="//www.rjmprogramming.com.au/itblog/match/mapper.php" title="//www.rjmprogramming.com.au/itblog/match/mapper.php?pm=" target=_blank onmouseover="this.href=this.title + encodeURIComponent(hight);" ontouchstart="this.href=this.title + encodeURIComponent(hight);" id=b_hfloater_posting_title_search>' + hight + '</a></b><br>';
} else {
document.getElementById('b_hfloater_wikipedia').innerHTML=hight;
document.getElementById('b_hfloater_google_translate').innerHTML=hight;
document.getElementById('b_hfloater_free_dictionary').innerHTML=hight;
document.getElementById('b_hfloater_google_search').innerHTML=hight;
document.getElementById('b_hfloater_tag_search').innerHTML=hight;
document.getElementById('b_hfloater_category_search').innerHTML=hight;
document.getElementById('b_hfloater_tag_first_word_search').innerHTML=hight;
document.getElementById('b_hfloater_posting_title_search').innerHTML=hight;
document.getElementById('hfloater').style.top=s_top;
document.getElementById('hfloater').style.left=s_left;
document.getElementById('hfloater').style.display='block';
}
}
} else if (xsel == '') {
if (document.getElementById('hfloater')) {
document.getElementById('hfloater').style.display='none';
}
hight='';
}
}

</script>

… called by the changed HTML snippet as below …


<body onload='lookforhighlight(); postcalendar(); changeasfordownload(); if (cafd == cafd) { cafd=0; } else { cafd=true; } checkonl(); setTimeout(initpostedoncc, 3000); widgetcon(); precc(); courseCookies(); cookie_fonts(); is_mentioned_by(); calendar_pass(); prejustshow(); details_summary(0); '>
<div id="hfloater"></div>


Previous relevant WordPress Plugin Primer Tutorial is shown below.

WordPress Plugin Primer Tutorial

Normally we make changes to this TwentyTen themed WordPress blog by changing that theme’s wp-content/themes/twentyten/header.php file. But today we show you how to write the PHP code needed to write a WordPress.org admin login plugin to create a hyperlink to a Wikipedia page regarding any text you have highlighted on your WordPress admin area webpage.

We thank …

• WordPress Codex
• WordPress Codex “Writing a Plugin”
• WordPress Codex “Plugin API”
• Hello Dolly plugin

… and we think you should read …

• Hooks
• Actions
• Filters
• Pluggable Functions
• Plugins directory

For us, with our very simple rjmprogramming-wikipedia-lookup.php plugin, we only needed the one piece of PHP to sit in the current WordPress wp-content/plugins directory, and then immediately be accessible to the WordPress blog admin area’s Plugins -> Activate option …


<?php
/**
* @package Rjmprogramming_Wikipedia_Lookup
* @version 1.6
*/
/*
Plugin Name: Rjmprogramming Wikipedia Lookup
Description: Float a Wikipedia lookup link for highlighted text of an admin webpage.
Author: Robert James Metcalfe
Version: 1.6
Author URI: //www.rjmprogramming.com.au/
*/

// This creates the Wikipedia lookup hyperlink
function rjmprogramming_wikipedia_lookup() {
$wikipedia_page = "Wikipedia Main Page";
echo '<a target="_blank" title="Wikipedia lookup of ..." onmouseover="var xsel=' .
"''" . '; xsel=window.getSelection().toString(); if (xsel.length == 0) {' .
' xsel=document.selection.createRange().htmlText;' .
' } if (xsel.length != 0) { this.innerHTML=xsel; this.href=' . "'" . '//wikipedia.org/wiki/' .
"'" . ' + xsel.replace(/\ /g,' . "'" . '_' . "'" . '); } " ontouchstart="var xsel=' .
'; xsel=window.getSelection().toString(); if (xsel.length == 0) {' .
' xsel=document.selection.createRange().htmlText; }' .
' if (xsel.length != 0) { this.innerHTML=xsel; this.href=' . "'" . '//wikipedia.org/wiki/' . "'" .
' + xsel.replace(/\ /g,' . "'" . '_' . "'" . '); } " id="rjmprogramming_wikipedia_lookup"' .
' href="//wikipedia.org/wiki/Main_Page">' . $wikipedia_page . '</a>';
}

// Now we set that function up to execute when the admin_notices action is called
add_action( 'admin_notices', 'rjmprogramming_wikipedia_lookup' );

// We need some CSS to position the hyperlink
function rjmprogramming_wikipedia_css() {
// This makes sure that the positioning is also good for right-to-left languages
$x = is_rtl() ? 'left' : 'right';

echo "
<style type='text/css'>
#rjmprogramming_wikipedia_lookup {
float: $x;
padding-$x: 15px;
padding-top: 5px;
margin: 0;
font-size: 11px;
}
</style>
";
}

add_action( 'admin_footer', 'rjmprogramming_wikipedia_css' );

?>


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