barcode scanner for java DEALING WITH TABLES in Font

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CHAPTER 7 DEALING WITH TABLES
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contents of the first and second parameters (rows) passed to the sort() function are extracted and converted to uppercase before they re compared. The sort() function then returns any of the values <0, =0, or >0, which helps in deciding which column contents should be moved up in the sort order and which should be pushed down in the sort order. When this sort function is finished, the rec array will have all the rows of the selected column sorted in ascending order. Finally, the sorted rows from the rec array are retrieved and appended to the tbody element of the table for display. Initially, the table may appear as shown in Figure 7-32.
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Figure 7-32. Unsorted table On selecting the Roll column, it will be highlighted and the table rows will be sorted in ascending order by roll number, as shown in Figure 7-33.
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Figure 7-33. Table sorted in ascending order by roll number Similarly, on selecting the Name column, it will be highlighted and the table rows will be sorted in ascending (alphabetical) order by name, as shown in Figure 7-34.
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Figure 7-34. Table sorted in ascending order by name
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CHAPTER 7 DEALING WITH TABLES
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Sorting a Column in both Ascending and Descending Order
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If any of the column heading is clicked for the first time, the table must be sorted in ascending order by that column, and if the column is clicked again, the table must be sorted in descending order by that column. In other words, we want the sort order to toggle on each click. In order to inform the user which sorting order is currently applied on a column, we need to display an up or down arrow in the column heading. The up arrow will denote that the table is sorted in ascending order by that column, and the down arrow will indicate that the table is sorted in descending order by the column. To display the up and down arrows in the column headings, we need to define two style rules in the style sheet file style.css, as shown here: style.css .asc{ background:url('up.png') no-repeat; padding-left:20px; } .desc{ background:url('down.png') no-repeat; padding-left:20px; } Let s now modify the jQuery code to sort the table in ascending as well as in descending order by the selected column: $(document).ready(function() { $('th').each(function(column) { $(this).hover( function(){ $(this).addClass('hover'); }, function(){ $(this).removeClass('hover'); } ); $(this).click(function(){ if($(this).is('.asc')) { $(this).removeClass('asc'); $(this).addClass('desc'); sortdir=-1; } else { $(this).addClass('asc'); $(this).removeClass('desc'); sortdir=1; } $(this).siblings().removeClass('asc'); $(this).siblings().removeClass('desc'); var rec=$('table').find('tbody >tr').get();
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CHAPTER 7 DEALING WITH TABLES
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rec.sort(function(a, b) { var val1 = $(a).children('td').eq(column).text().toUpperCase(); var val2 = $(b).children('td').eq(column).text().toUpperCase(); return (val1 < val2) -sortdir : (val1 > val2) sortdir : 0; }); $.each(rec, function(index, row) { $('tbody').append(row); }); }); }); });
How It Works
The style rule .asc contains the background property set to url(up.png) to display an up arrow pointer in the column heading. The value no-repeat will make the pointer appear only once in the column heading, and the padding-left property is set to 20px to create some space on the left. Similarly, the style rule desc contains the background property to display the down arrow pointer in the column headings. Then our jQuery code begins by checking each of the table headings to see any of them are hovered over. If any of the table headings are in fact hovered over, the style properties defined in the style rule .hover will be applied to it to highlight it. Also, when the mouse pointer is moved away from the column heading, the style properties of the .hover style rule will be removed, making the column heading appear as it did initially. We then attach a click event to each of the table headings and check if the selected column heading has the style rule .asc applied to it. That is, we check if the table is already sorted in ascending order by the selected column heading. If it is, we remove the style properties defined in the style rule asc and apply the style properties defined in the style rule desc (when a column heading that s been sorted in ascending order is clicked again). As a result, the column heading will display a down arrow on its left. Also, the value of the variable sortdir is set to 1, which will be used to manipulate the return values of the sort function to perform sorting in descending order. If the selected column had the desc style rule already applied to it that is, if the table is sorted in descending order by the selected column we remove the style properties defined in the style rule desc and apply the properties defined in the style rule asc, which will place an up arrow to the left of the column heading. Also, the value of the variable sortdir is 1 to make the sort function sort in ascending order. Once we've sorted the column, we need to remove the properties of the style rules .asc and .desc from all the column headings except the one that is selected by the user. We also need to retrieve all the table rows (nested in the tbody element) and store them in the variable rec, which will be now be an array containing all the table rows. We can then invoke the sort function on the rec array. The sort function will repeatedly take two elements (rows) of the array at a time and arrange them in sort order as decided by the value in the variable sortdir. The sort function begins by extracting the column contents of the first and second parameters (rows) passed to the sort function, then converts them to upper case before comparing them. The function returns any of the values <0, =0, or >0, which helps in deciding which column contents should be moved up in the sort order and which should be pushed down in the sort order. When this sort function is complete, the rec array will have all the rows sorted in either ascending or descending order by the selected column, depending on the value assigned to the variable sortdir. Finally, the sorted rows from the rec array are retrieved and appended to the tbody element of the table for display.
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