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Lucene example source code file (breadcrumbs.js)

This example Lucene source code file (breadcrumbs.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

array, array, css_class_crumb, css_class_separator, css_class_trail, display_postprend, display_postprend, display_preprend, display_preprend, display_separator, display_separator, file_extensions, path_separator, preprend_crumbs

The Lucene breadcrumbs.js source code

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
 * This script, when included in a html file, builds a neat breadcrumb trail
 * based on its url. That is, if it doesn't contains bugs (I'm relatively
 * sure it does).
 *
 * Typical usage:
 * <script type="text/javascript" language="JavaScript" src="breadcrumbs.js">
 */

/**
 * IE 5 on Mac doesn't know Array.push.
 *
 * Implement it - courtesy to fritz.
 */
var abc	= new Array();
if (!abc.push) {
  Array.prototype.push	= function(what){this[this.length]=what}
}

/* ========================================================================
	CONSTANTS
   ======================================================================== */

/**
 * Two-dimensional array containing extra crumbs to place at the front of
 * the trail. Specify first the name of the crumb, then the URI that belongs
 * to it. You'll need to modify this for every domain or subdomain where
 * you use this script (you can leave it as an empty array if you wish)
 */
var PREPREND_CRUMBS = new Array();

var link1 = "@skinconfig.trail.link1.name@";
var link2 = "@skinconfig.trail.link2.name@";
var link3 = "@skinconfig.trail.link3.name@";

var href1 = "@skinconfig.trail.link1.href@";
var href2 = "@skinconfig.trail.link2.href@";
var href3 = "@skinconfig.trail.link3.href@";

   if(!(link1=="")&&!link1.indexOf( "@" ) == 0){
     PREPREND_CRUMBS.push( new Array( link1, href1 ) );
   }
   if(!(link2=="")&&!link2.indexOf( "@" ) == 0){
     PREPREND_CRUMBS.push( new Array( link2, href2 ) );
   }
   if(!(link3=="")&&!link3.indexOf( "@" ) == 0){
     PREPREND_CRUMBS.push( new Array( link3, href3 ) );
   }

/**
 * String to include between crumbs:
 */
var DISPLAY_SEPARATOR = " > ";
/**
 * String to include at the beginning of the trail
 */
var DISPLAY_PREPREND = " > ";
/**
 * String to include at the end of the trail
 */
var DISPLAY_POSTPREND = "";

/**
 * CSS Class to use for a single crumb:
 */
var CSS_CLASS_CRUMB = "breadcrumb";

/**
 * CSS Class to use for the complete trail:
 */
var CSS_CLASS_TRAIL = "breadcrumbTrail";

/**
 * CSS Class to use for crumb separator:
 */
var CSS_CLASS_SEPARATOR = "crumbSeparator";

/**
 * Array of strings containing common file extensions. We use this to
 * determine what part of the url to ignore (if it contains one of the
 * string specified here, we ignore it).
 */
var FILE_EXTENSIONS = new Array( ".html", ".htm", ".jsp", ".php", ".php3", ".php4" );

/**
 * String that separates parts of the breadcrumb trail from each other.
 * When this is no longer a slash, I'm sure I'll be old and grey.
 */
var PATH_SEPARATOR = "/";

/* ========================================================================
	UTILITY FUNCTIONS
   ======================================================================== */
/**
 * Capitalize first letter of the provided string and return the modified
 * string.
 */
function sentenceCase( string )
{        return string;
	//var lower = string.toLowerCase();
	//return lower.substr(0,1).toUpperCase() + lower.substr(1);
}

/**
 * Returns an array containing the names of all the directories in the
 * current document URL
 */
function getDirectoriesInURL()
{
	var trail = document.location.pathname.split( PATH_SEPARATOR );

	// check whether last section is a file or a directory
	var lastcrumb = trail[trail.length-1];
	for( var i = 0; i < FILE_EXTENSIONS.length; i++ )
	{
		if( lastcrumb.indexOf( FILE_EXTENSIONS[i] ) )
		{
			// it is, remove it and send results
			return trail.slice( 1, trail.length-1 );
		}
	}

	// it's not; send the trail unmodified
	return trail.slice( 1, trail.length );
}

/* ========================================================================
	BREADCRUMB FUNCTIONALITY
   ======================================================================== */
/**
 * Return a two-dimensional array describing the breadcrumbs based on the
 * array of directories passed in.
 */
function getBreadcrumbs( dirs )
{
	var prefix = "/";
	var postfix = "/";

	// the array we will return
	var crumbs = new Array();

	if( dirs != null )
	{
		for( var i = 0; i < dirs.length; i++ )
		{
			prefix += dirs[i] + postfix;
			crumbs.push( new Array( dirs[i], prefix ) );
		}
	}

	// preprend the PREPREND_CRUMBS
	if(PREPREND_CRUMBS.length > 0 )
	{
		return PREPREND_CRUMBS.concat( crumbs );
	}

	return crumbs;
}

/**
 * Return a string containing a simple text breadcrumb trail based on the
 * two-dimensional array passed in.
 */
function getCrumbTrail( crumbs )
{
	var xhtml = DISPLAY_PREPREND;

	for( var i = 0; i < crumbs.length; i++ )
	{
		xhtml += '<a href="' + crumbs[i][1] + '" >';
		xhtml += unescape( crumbs[i][0] ) + '</a>';
		if( i != (crumbs.length-1) )
		{
			xhtml += DISPLAY_SEPARATOR;
		}
	}

	xhtml += DISPLAY_POSTPREND;

	return xhtml;
}

/**
 * Return a string containing an XHTML breadcrumb trail based on the
 * two-dimensional array passed in.
 */
function getCrumbTrailXHTML( crumbs )
{
	var xhtml = '<span class="' + CSS_CLASS_TRAIL  + '">';
	xhtml += DISPLAY_PREPREND;

	for( var i = 0; i < crumbs.length; i++ )
	{
		xhtml += '<a href="' + crumbs[i][1] + '" class="' + CSS_CLASS_CRUMB + '">';
		xhtml += unescape( crumbs[i][0] ) + '</a>';
		if( i != (crumbs.length-1) )
		{
			xhtml += '<span class="' + CSS_CLASS_SEPARATOR + '">' + DISPLAY_SEPARATOR + '';
		}
	}

	xhtml += DISPLAY_POSTPREND;
	xhtml += '</span>';

	return xhtml;
}

/* ========================================================================
	PRINT BREADCRUMB TRAIL
   ======================================================================== */

// check if we're local; if so, only print the PREPREND_CRUMBS
if( document.location.href.toLowerCase().indexOf( "http://" ) == -1 )
{
	document.write( getCrumbTrail( getBreadcrumbs() ) );
}
else
{
	document.write( getCrumbTrail( getBreadcrumbs( getDirectoriesInURL() ) ) );
}

Other Lucene examples (source code examples)

Here is a short list of links related to this Lucene breadcrumbs.js source code file:



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