Remove Duplications

Description

Sometimes, if you are using the ListPages module for data presentation, you may list duplicate results. In such cases, you can use this special add-on to remove all duplicated instances, and place them in a list.

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This is the code that does all of the hard work. You should never need to use this code.

<html>
<head>
    <title>Remove Duplications</title>
    <!-- © James Kanjo 2009 -->
</head>
<body>
    <script type="text/javascript">
        var newCSS = document.createElement('link');
        newCSS.rel = 'stylesheet';
 
        var css_params = /^#(#[^#]*)#.*$/;
        var css = css_params.exec(unescape(parent.parent.location.hash));
        if (css) {
            newCSS.href = 'data:text/css,' + '@import url("' + css[1].substring(1) + '");';
        }
        document.getElementsByTagName("head")[0].appendChild(newCSS);
    </script>
 
    <script type="text/javascript">
        <!--
        /* Remove duplicate elements from array function taken from:
        http://www.martienus.com/code/javascript-remove-duplicates-from-array.html
        */
        function unique(a) {
            var r = new Array();
            o:for(var i = 0, n = a.length; i < n; i++) {
                for(var x = 0, y = r.length; x < y; x++) {
                    if(r[x]==a[i]) continue o;
                }
                r[r.length] = a[i];
            }
            return r;
        }
        //-->
 
        var params = /^##?[^#]*?(#.*)$/;
        var string_items = params.exec(unescape(window.location.hash))[1];
 
        var items = new Array();
        var tmp_count = 0;
 
        while (0<=string_items.search(/#/)) {
            string_items = string_items.substring(string_items.search(/#/)+1);
            items[tmp_count] = string_items.substring(string_items.search(/#/)+1);
            if (0<=string_items.search(/#/))
                items[tmp_count] = string_items.substring(0,string_items.search(/#/));
            tmp_count = tmp_count+1;
        }
 
        items = unique(items);
        for (tmp_count=0;tmp_count<=items.length-1;tmp_count++) {
            document.write('<span class="unique-item">' + items[tmp_count] + '</span><br />');
        }
    </script>
</body>
</html>

Code

Use the ListPages module to compile the list that may have duplicate results:

[[module ListPages perPage="250" limit="250" separate="false" appendLine="[[include :snippets:code:_rdr |no-results=Sorry! There appears to be no results matching your specified criteria...]]"]]

[[embed]]<iframe frameborder="0" scrolling="auto" style="width: 100%; height: 300px;" src="http://snippets.wdfiles.com/local--code/code:remove-duplicate-results[!--

--]#ITEM[!--

[[/module]]

If you would like to use your own custom CSS for this module, just prepend ##CSS-URL to the [!----] code, like so:

[[module ListPages perPage="250" limit="250" separate="false" appendLine="[[include :snippets:code:_rdr |no-results=Sorry! There appears to be no results matching your specified criteria...]]"]]

[[embed]]<iframe frameborder="0" scrolling="auto" style="width: 100%; height: 300px;" src="http://snippets.wdfiles.com/local--code/code:remove-duplicate-results##CSS-URL[!--

--]#ITEM[!--

[[/module]]

The CSS class used to control the items in the list is .unique-item

In action

This code would be useful if you want to list the most active users over the past 24 hours:

**Currently Active Users:**
[[module ListPages category="*" order="updated_at desc" date="last 1 day" perPage="250" limit="250" separate="false" appendLine="[[include :snippets:code:_rdr |no-results=There appears to be no active users over the past 24 hours...]]"]]

[[embed]]<iframe frameborder="0" scrolling="auto" style="width: 100%; height: 125px;" src="http://snippets.wdfiles.com/local--code/code:remove-duplicate-results[!--

--]#%%created_by%%[!--

[[/module]]

Currently Active Users:

There appears to be no active users over the past 24 hours…

Thanks to tsangk for this great snippet: conditional-blocks

text above inserted with:

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page revision: 12, last edited: 16 Feb 2012 01:39

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