function _TF_trimWhitespace(txt) {
var strTmp = txt;
//trimming from the front
for (counter=0; counter<strTmp.length; counter++)
if (strTmp.charAt(counter) != " ")
break;
//trimming from the back
strTmp = strTmp.substring(counter,strTmp.length);
counter = strTmp.length - 1;
for (counter; counter>=0; counter--)
if (strTmp.charAt(counter) != " ")
break;
return strTmp.substring(0, counter+1);
}

function _TF_showAll(tb) {
for (i=0;i<tb.rows.length;i++)
{
tb.rows[i].style.display = "";
}
}

function _TF_shouldShow(type, con, val) {
var toshow=true;
if (type != null) type = type.toLowerCase();
switch (type)
{
case "item":
var strarray = val.split(",");
innershow = false;
for (ss=0;ss<strarray.length;ss++){
if (con==_TF_trimWhitespace(strarray[ss])){
innershow=true;
break;
}
}
if (innershow == false)
toshow=false;
break
case "full":
if (val!=con)
toshow = false;
break
case "substring":
if (val.indexOf(con)<0)
toshow = false;
break
default: //is "substring1" search
if (val.indexOf(con)!=0) //pattern must start from 1st char
toshow = false;
if (con.charAt(con.length-1) == " ")
{ //last char is a space, so lets do a full search as well
if (_TF_trimWhitespace(con) != val)
toshow = false;
else
toshow = true;
}
break
}
return toshow;
}

function _TF_filterTable(tb, conditions) {
//given an array of conditions, lets search the table

for (i=0;i<tb.rows.length;i++)
{
var show = true;
var rw = tb.rows[i];
for (j=0;j<rw.cells.length;j++)
{
var cl = rw.cells[j];
for (k=0;k<conditions.length;k++)
{
var colKey = cl.getAttribute("TF_colKey");
if (colKey == null) //attribute not found
continue; //so lets not search on this cell.
if (conditions[k].name.toUpperCase() == colKey.toUpperCase())
{
var tbVal = cl.innerText;
var conVals = conditions[k].value;
if (conditions[k].single) //single value
{
show = _TF_shouldShow(conditions[k].type, conditions[k].value, cl.innerText);
} else { //multiple values
for (l=0;l<conditions[k].value.length;l++)
{
innershow = _TF_shouldShow(conditions[k].type, conditions[k].value[l], cl.innerText);
if (innershow == true) break;
}
if (innershow == false)
show = false;
}
}
}
//if any condition has failed, then we stop the matching (due to AND behaviour)
if (show == false)
break;
}
if (show == true)
tb.rows[i].style.display = "";
else
tb.rows[i].style.display = "none";
}
}

/** PUBLIC FUNCTIONS **/
//main function
function TF_filterTable(tb, frm) {
var conditions = new Array();
if (frm.style.display == "none") //filtering is off
return _TF_showAll(tb);

//go thru each type of input elements to figure out the filter conditions
var inputs = frm.tags("INPUT");
for (i=0;i<inputs.length;i++)
{ //looping thru all INPUT elements
if (inputs[i].getAttribute("TF_colKey") == null) //attribute not found
continue; //we assume that this input field is not for us
switch (inputs[i].type)
{
case "text":
case "hidden":
if(inputs[i].value != "")
{
index = conditions.length;
conditions[index] = new Object;
conditions[index].name = inputs[i].getAttribute("TF_colKey");
conditions[index].type = inputs[i].getAttribute("TF_searchType");
conditions[index].value = inputs[i].value;
conditions[index].single = true;
}
break
}
}
var inputs = frm.tags("SELECT");
//able to do multiple selection box
for (i=0;i<inputs.length;i++)
{ //looping thru all SELECT elements
if (inputs[i].getAttribute("TF_colKey") == null) //attribute not found
continue; //we assume that this input field is not for us
var opts = inputs[i].options;
var optsSelected = new Array();
for (intLoop=0; intLoop<opts.length; intLoop++)
{ //looping thru all OPTIONS elements
if (opts[intLoop].selected && (opts[intLoop].getAttribute("TF_not_used") == null))
{
index = optsSelected.length;
optsSelected[index] = opts[intLoop].value;
}
}
if (optsSelected.length > 0) //has selected items
{
index = conditions.length;
conditions[index] = new Object;
conditions[index].name = inputs[i].getAttribute("TF_colKey");
conditions[index].type = inputs[i].getAttribute("TF_searchType");
conditions[index].value = optsSelected;
conditions[index].single = false;
}
}
//ok, now that we have all the conditions, lets do the filtering proper
_TF_filterTable(tb, conditions);
}

function TF_enableFilter(tb, frm, val) {
if (val.checked) //filtering is on
{
frm.style.display = "";
} else { //filtering is off
frm.style.display = "none";
}
//refresh the table
TF_filterTable(tb, frm);
}

function _TF_get_value(input) {
switch (input.type)
{
case "text":
return input.value;
break
case "select-one":
if (input.selectedIndex > -1) //has value
return input.options(input.selectedIndex).value;
else
return "";
break;
}
}

//util function that concat two input fields and set the result in the third
function TF_concat_and_set(salText, salSelect, salHidden) {
var valLeft = _TF_get_value(salText);
var valRight = _TF_get_value(salSelect);
salHidden.value = valLeft + valRight;
}