autolab/Autolab

/*
    Table.js
    Enumerates dynamic tables of class "sortable".
    Adds <th class=enum>#</th> to every row.
*/

/*    Checks if an element is of a given class*/
function hasClass(element, cls) {return (' ' + element.className + ' ').indexOf(' ' + cls + ' ') > -1;}

/*    Renumbers enumerated cells. Useful after sorting table rows.*/
function updatenum(table){
    var rows = table.getElementsByTagName("tr");
    for (var i=0; i<rows.length; i++){
        var el = rows[i].getElementsByTagName("th")[0];
        if (el && hasClass(el, 'enum')){el.innerHTML=i;}
    }
}

/*    Enumerates a table    */
function enumerate(table){
    table.setAttribute('onclick','updatenum(this);');
    var rows = table.getElementsByTagName("tr");    
    
    /*Defines style for enumerated cells*/
    var style = "style='background-color:#DDD; padding:1px; text-align:center; font-size:10px; color:#444;'";
    for (var i=0; i<rows.length; i++){rows[i].innerHTML = "<th class='enum'" + style + ">"+i+"</td>"+rows[i].innerHTML;}
}

/*    Main function - applies sorting*/
function reapply(){
    /* brokentable() checks if a table has been enumerated or overwritten */
    function brokentable(table){
        var el = table.getElementsByTagName("th")[0];
        return (el && !hasClass(el, 'enum'));}
        
    /*     Iterate through all sortable tables, and check if
        they are enumerated.  If not, enumerate. */
    var tables = document.getElementsByTagName("table");
    for (var j=0; j<tables.length; j++){
        if (hasClass(tables[j], 'sortable')){
            if (brokentable(tables[j])==true){enumerate(tables[j]);}
        }
    }
    
    /* Check again in case content has changed */
    setTimeout("reapply()",1000);
}

/*reapply();*/