Tutorial Remove Inline Styles

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This function also preserves hidden content.

function remove_style(all) {
  var i = all.length;
  var j, is_hidden;

  // Presentational attributes.
  var attr = [
    'align',
    'background',
    'bgcolor',
    'border',
    'cellpadding',
    'cellspacing',
    'color',
    'face',
    'height',
    'hspace',
    'marginheight',
    'marginwidth',
    'noshade',
    'nowrap',
    'valign',
    'vspace',
    'width',
    'vlink',
    'alink',
    'text',
    'link',
    'frame',
    'frameborder',
    'clear',
    'scrolling',
    'style'
  ];

  var attr_len = attr.length;

  while (i--) {
    is_hidden = (all[i].style.display === 'none');

    j = attr_len;

    while (j--) {
      all[i].removeAttribute(attr[j]);
    }

    // Re-hide display:none elements,
    // so they can be toggled via JS.
    if (is_hidden) {
      all[i].style.display = 'none';
      is_hidden = false;
    }
  }
}

Usage

Call the function like this:

var all = document.getElementsByTagName('*');
remove_style(all);

Note: Selecting all elements in the page via a wildcard query could be slow, depending on how many elements are in the page. You could use a smaller set of elements to be more performant:

var set = document.getElementById('foo').getElementsByTagName('bar');
remove_style(set);

Code by Nathan Smith.

Tutorial Redirect to SSL

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window.location = "https://" + window.location.hostname + window.location.pathname + window.location.search;

You might wanna test if window.location.href doesn't start with "https" before doing that, so you don't redirect unless you have to.

Tutorial Redirect

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<script type="text/javascript">
<!--
  window.location = "http://www.google.com/"
//-->
</script>

Tutorial Random Hex Color

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var randomColor = Math.floor(Math.random()*16777215).toString(16);

View Demo

There is also a PHP version.

Reference URL

Tutorial Put Comma Values in Numbers

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This function assumes what is being submitted to it is a string, with a decimal point and two places after the decimal. To get your number into that format first, use this.

Then this function will properly comma separate the number. For example, 2345643.00 will return 2,345,643.00

function CommaFormatted(amount) {
	var delimiter = ","; // replace comma if desired
	var a = amount.split('.',2)
	var d = a[1];
	var i = parseInt(a[0]);
	if(isNaN(i)) { return ''; }
	var minus = '';
	if(i < 0) { minus = '-'; }
	i = Math.abs(i);
	var n = new String(i);
	var a = [];
	while(n.length > 3) {
		var nn = n.substr(n.length-3);
		a.unshift(nn);
		n = n.substr(0,n.length-3);
	}
	if(n.length > 0) { a.unshift(n); }
	n = a.join(delimiter);
	if(d.length < 1) { amount = n; }
	else { amount = n + '.' + d; }
	amount = minus + amount;
	return amount;
}

Tutorial Print Object To Screen

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PHP has a nice print_r function for printing out information about a variable to the screen. console.log() is great for that in JavaScript also, but sometimes you just need/want to look at it on the screen.

function print_r(o) {
  return JSON.stringify(o,null,'\t').replace(/\n/g,'<br>').replace(/\t/g,'&nbsp;&nbsp;&nbsp;'); 
}

So if you have an object like: 

var myObject = {
   "lunch": "sandwich",
   "dinner": "stirfry"
};

You could do:

var putHere = document.getElementById("#put-here");

putHere.innerHTML = print_r(myObject);

to see the result on screen.

Also, console.table() is sometimes much better than console.log() for this kind of thing.

Tutorial Prevent Embedded JavaScript from Failing Validation

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Ever see that CDATA stuff in JavaScript and wonder what it was for? It is to prevent the validator from reading that code as markup and failing validation. For example, ampersands (&) and greater-than / less-than signs (< >)are often culprits for failing validation when it's actually perfectly OK to use them in JavaScript.

<script type="text/javascript">
  //<![CDATA[

    alert("<This is compatible with XHTML>");

  //]]>
</script>