Category Archives: HTML

Boolean object in JavaScript

The Boolean object represents two values either “true” or “false”.

new Boolean(value);

If value parameter is omitted, 0, -0, null, false, NaN, undefined, or the empty string (“”), the object has an initial value of false due to automatic type coercion.

Here’s a simple test for the JavaScript boolean object, here’s the HTML anchor tag I used to call a function:

<a href=”http://www.melvinswebstuff.com” onclick=”GetBoolean(‘true’); return false;”>Get Boolean</a>

Here’s the JavaScript function:

function GetBoolean(bBool){
	//Create a boolean object
	var myBoolean = new Boolean();
	myBoolean = true;
	
	if(myBoolean) alert('myBoolean = ' + myBoolean);
	
	if(myBoolean) alert('bBool = ' + bBool);
	
	if(bBool == myBoolean){
		alert('bBool == myBoolean');
	} else {
		alert('bBool <> myBoolean');
	}
	
}

The correct use of em and en

The em dash (—) is used to indicate a sudden break in thought.

The en dash (–) is used to indicate a range of just about anything with numbers, including dates, numbers, game scores, and pages in any sort of document.

HTML Special Characters

&ndash; &#8211;

en dash
&mdash; &#8212;

em dash
¡ &iexcl; &#161; inverted exclamation
¿ &iquest; &#191; inverted question mark
" &quot; &#34; quotation mark
&ldquo; &#8220; left double curly quote
&rdquo; &#8221; right double curly quote
'   &#39; apostrophe (single quote)
&lsquo; &#8216; left single curly quote
&rsquo; &#8217; right single curly quote
«


»
&laquo;


&raquo;
&#171;


&#187;
guillemets
  &nbsp; &#160; non-breaking space
Symbols
& &amp; &#38; ampersand
¢ &cent; &#162; cent
© &copy; &#169; copyright
÷ &divide; &#247; divide
> &gt; &#62; greater than
< &lt; &#60; less than
µ &micro; &#181; micron
· &middot; &#183; middle dot
&para; &#182; pilcrow (paragraph sign)
± &plusmn; &#177; plus/minus
&euro; &#8364; Euro
£ &pound; &#163; British Pound Sterling
® &reg; &#174; registered
§ &sect; &#167; section
&trade; &#153; trademark
¥ &yen; &#165; Japanese Yen
Diacritics
á


Á
&aacute;


&Aacute;
&#225;


&#193;
lower-case "a" with acute accent


upper-case "A" with acute accent
à


À
&agrave;


&Agrave;
&#224;


&#192;
lower-case "a" with grave accent


upper-case "A" with grave accent
â


Â
&acirc;


&Acirc;
&#226;


&#194;
lower-case "a" with circumflex


upper-case "A" with circumflex
å


Å
&aring;


&Aring;
&#229;


&#197;
lower-case "a" with ring


upper-case "A" with ring
ã


Ã
&atilde;


&Atilde;
&#227;


&#195;
lower-case "a" with tilde


upper-case "A" with tilde
ä


Ä
&auml;


&Auml;
&#228;


&#196;
lower-case "a" with diaeresis/umlaut


upper-case "A" with diaeresis/umlaut
æ


Æ
&aelig;


&AElig;
&#230;


&#198;
lower-case "ae" ligature


upper-case "AE" ligature
ç


Ç
&ccedil;


&Ccedil;
&#231;


&#199;
lower-case "c" with cedilla


upper-case "C" with cedilla
é


É
&eacute;


&Eacute;
&#233;


&#201;
lower-case "e" with acute accent


upper-case "E" with acute accent
è


È
&egrave;


&Egrave;
&#232;


&#200;
lower-case "e" with grave accent


upper-case "E" with grave accent
ê


Ê
&ecirc;


&Ecirc;
&#234;


&#202;
lower-case "e" with circumflex


upper-case "E" with circumflex
ë


Ë
&euml;


&Euml;
&#235;


&#203;
lower-case "e" with diaeresis/umlaut


upper-case "E" with diaeresis/umlaut
í


Í
&iacute;


&Iacute;
&#237;


&#205;
lower-case "i" with acute accent


upper-case "I" with acute accent
ì


Ì
&igrave;


&Igrave;
&#236;


&#204;
lower-case "i" with grave accent


upper-case "I" with grave accent
î


Î
&icirc;


&Icirc;
&#238;


&#206;
lower-case "i" with circumflex


upper-case "I" with circumflex
ï


Ï
&iuml;


&Iuml;
&#239;


&#207;
lower-case "i" with diaeresis/umlaut


upper-case "I" with diaeresis/umlaut
ñ


Ñ
&ntilde;


&Ntilde;
&#241;


&#209;
lower-case "n" with tilde


upper-case "N" with tilde
ó


Ó
&oacute;


&Oacute;
&#243;


&#211;
lower-case "o" with acute accent


upper-case "O" with acute accent
ò


Ò
&ograve;


&Ograve;
&#242;


&#210;
lower-case "o" with grave accent


upper-case "O" with grave accent
ô


Ô
&ocirc;


&Ocirc;
&#244;


&#212;
lower-case "o" with circumflex


upper-case "O" with circumflex
ø


Ø
&oslash;


&Oslash;
&#248;


&#216;
lower-case "o" with slash


upper-case "O" with slash
õ


Õ
&otilde;


&Otilde;
&#245;


&#213;
lower-case "o" with tilde


upper-case "O" with tilde
ö


Ö
&ouml;


&Ouml;
&#246;


&#214;
lower-case "o" with diaeresis/umlaut


upper-case "O" with diaeresis/umlaut
ß &szlig; &#223; ess-tsett
ú


Ú
&uacute;


&Uacute;
&#250;


&#218;
lower-case "u" with acute accent


upper-case "U" with acute accent
ù


Ù
&ugrave;


&Ugrave;
&#249;


&#217;
lower-case "u" with grave accent


upper-case "U" with grave accent
û


Û
&ucirc;


&Ucirc;
&#251;


&#219;
lower-case "u" with circumflex


upper-case "U" with circumflex
ü


Ü
&uuml;


&Uuml;
&#252;


&#220;
lower-case "u" with diaeresis/umlaut


upper-case "U" with diaeresis/umlaut
ÿ &yuml; &#255; lower-case "y" with diaeresis/umlaut
´


`
  &#180;


&#96;
acute accent with no letter


grave accent/reversed apostrophe with no letter