print_r(), JavaScript Edition  | Site Moderator | | Join Date: Apr 2007 Location: Texas
Posts: 5,435
# 1
Aug 31 '07
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Looking for a print_r() for JavaScript? Look no further! Finally, a decent way to figure out what's in that mysterious Array or Object!
Note that this version of print_r() relies on (included) getType(), which is designed to be a browser-independent way of detecting basic types in JavaScript (unfortunately, the $object.constructor.match() trick doesn't work in Safari nor IE).
Special thanks to the following TSDN members whose help was invaluable and greatly appreciated during the development of this procedure: - gits
- iam_clint
- volectricity
- Purple
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<html>
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<head>
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<script type="text/javascript">
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/**
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* getType
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*
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* Use this when typeof returns 'Object'.
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*
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* @param mixed $obj The object to investigrate.
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*
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* @return string The object's constructor.
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*
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* @author Josh Zerin, Life Blue Media (http://www.lifeblue.com/)
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* @author Special thanks to:
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* - gits
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* - iam_clint
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* - volectricity
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* - Purple
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* http://www.thescripts.com/
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*/
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function getType($obj)
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{
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/***************
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*
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* Two special cases: undefined and null.
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*/
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if( typeof $obj == 'undefined' )
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{
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return 'undefined';
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}
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if($obj === null)
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{
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return 'null';
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}
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/***************
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*
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* Run through the standard constructors.
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*/
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switch($obj.constructor)
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{
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case Array:
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return 'Array';
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case Boolean:
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return 'Boolean';
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case Date:
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return 'Date';
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case Error:
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return 'Error';
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case Function:
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return 'Function';
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case Number:
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return 'Number';
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case RegExp:
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return 'RegExp';
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case String:
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return 'String';
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default:
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/***************
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*
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* HTML Elements will have a nodeType property. It is unlikely, though possible, that other objects will.
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*/
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if( typeof($obj.nodeType) != 'undefined' )
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{
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return 'HTML ' + $obj.nodeName.toUpperCase() + ' Element';
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}
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/***************
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*
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* If it's not an HTML Element, it might be an Event.
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*/
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if($obj.toString)
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{
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if($obj.toString().match('Event'))
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{
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return 'Event';
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}
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}
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/***************
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*
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* I give up.
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*/
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return 'Object';
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}
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}
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/**
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*
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* print_r
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*
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* Similar to the PHP function of the same name, except it always returns its output (I never liked that about PHP's print_r()).
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*
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* @param mixed $content The variable you're trying to print_r. Generally an object or array.
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*
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* @param bool $htmlEncode How to format the output:
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* - true: Use <br /> for line breaks, and for tabs.
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* - false: Use \n for line breaks and \t for tabs.
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*
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* @param string $basePrefix The base prefix that will be appended to all lines of output. Very useful if you need your debug output to all line up (and something that REALLY bugs me about PHP's print_r()!).
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*
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* @param string $_prefix (internal)
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*
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* @return string A print_r()'ed string, similar in format to the PHP function of the same name (but with a few enhancements ~_^).
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*
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* @author Josh Zerin, Life Blue Media (http://www.lifeblue.com/)
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* @author Special thanks to:
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* - gits
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* - iam_clint
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* - volectricity
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* - Purple
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* http://www.thescripts.com/
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*/
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function print_r($content, $htmlEncode, $basePrefix, $_prefix)
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{
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/***************
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*
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* $_prefix must be a string.
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*/
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if( ! $_prefix )
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{
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$_prefix = '';
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}
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/***************
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*
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* Set the $basePrefix if not already set.
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*/
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if( ! $basePrefix )
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{
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$basePrefix =
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(
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// If $_prefix is defined, we'll just use that.
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$_prefix
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? $_prefix
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:
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(
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// Otherwise, use a default.
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$htmlEncode
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? ' '
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: '\t'
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)
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);
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}
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/***************
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*
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* How do we display newlines?
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*/
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var $newLine = ($htmlEncode ? '<br />' : '') + '\n';
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/***************
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*
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* Init output string.
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*/
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var $retVal = '';
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/****************
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*
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* We don't need to redundantly output certain types (the 'value' of null & undefined are self-explanatory, and we auto-output the type of Array & Object, so we don't want to do it twice).
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*/
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var $blacklistDisplayType =
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{
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'null': true,
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'Array': true,
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'Object': true,
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'undefined': true
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}
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/***************
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*
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* Begin processing $content.
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*/
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var $myType = getType($content);
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var $subType = '';
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/***************
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*
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* And off we go!
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*/
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if( $myType == 'Array' )
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{
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// E.g., "Array:\n\t(\n"
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$retVal += $myType + ':' + $newLine + $_prefix + '(' + $newLine;
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/***************
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*
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* Save the closing format before we go modifying $_prefix.
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*/
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var $close = $_prefix + ')' + $newLine;
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/***************
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*
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* $basePrefix is only for *child* elements of the array.
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*/
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$_prefix += $basePrefix;
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/***************
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*
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* for...in not useful on Arrays, since that will also return member functions.
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*/
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for( var $i = 0; $i < $content.length; ++$i )
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{
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var $innerType = getType($content[$i]);
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// E.g., "\t\t0 => (Number) "
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$retVal += $_prefix + $i + ' => ' +
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(
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/***************
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*
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* Should we display the type of the child element?
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*/
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$blacklistDisplayType[$innerType]
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? ''
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: ' (' + getType($content[$i]) + ')'
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) + ' ';
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/***************
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*
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* If the child element has children of its own, recursively process them.
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*/
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if(($innerType == 'Array') || ($innerType == 'Object'))
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{
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$retVal +=
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print_r
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(
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$content[$i],
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$htmlEncode,
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$basePrefix,
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$_prefix
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);
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}
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else
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{
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$retVal += $content[$i] + $newLine;
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}
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}
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// E.g., "\t)\n"
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$retVal += $close;
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}
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else if( $myType == 'Object' )
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{
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$retVal += $myType + ':' + $newLine + $_prefix + '(' + $newLine;
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var $close = $_prefix + ')' + $newLine;
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$_prefix += $basePrefix;
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/***************
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*
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* for not useful on Objects, since they generally have no length property.
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*/
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for( $i in $content )
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{
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var $innerType = getType($content[$i]);
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$retVal += $_prefix + $i + ' => ' +
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(
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$blacklistDisplayType[$innerType]
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? ''
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: ' (' + getType($content[$i]) + ')'
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) + ' ';
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if( ($innerType == 'Array') || ($innerType == 'Object') )
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{
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$retVal +=
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print_r
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(
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$content[$i],
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$htmlEncode,
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$basePrefix,
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$_prefix
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);
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}
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else
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{
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$retVal += $content[$i] + $newLine;
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}
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}
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$retVal += $close;
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}
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else
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{
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/***************
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*
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* If it ain't an object, then it's scalar.
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*/
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$retVal += $content;
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}
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/***************
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*
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* And we're done!
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*/
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return $retVal;
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}
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</script>
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</head>
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<body>
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<script type="text/javascript">
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// <![CDATA[
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/*
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Desired output:
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Object:
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(
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Array => Array:
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(
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0 => (Number) 0
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1 => (String) 1
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2 => (Number) 2.3
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3 => (String) Four
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4 => Object:
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(
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Five => (Number) 5
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)
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)
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Number => (Number) 1
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Float => (Number) 2.3
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String => (String) Four
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Sub => Object:
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(
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empty => (Boolean) false
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)
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null => null
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undef => undefined
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Element => (HTML BODY Element) [object HTMLBodyElement]
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)
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*/
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var $theObj = {
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'Array': [
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0, '1', 2.3, 'Four', { 'Five': 5 }
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],
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'Number': 1,
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'Float': 2.3,
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'String': 'Four',
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'Sub': {
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'empty': false
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},
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'null': null,
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'undef': undefined,
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'Element': document.getElementsByTagName('body')[0]
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};
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document.write(print_r($theObj, true));
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// ]]>
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</script>
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</body>
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</html>
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