how to connect barcode reader to java application Highlighting a Table Row on Hover in Font

Draw PDF 417 in Font Highlighting a Table Row on Hover

7-1. Highlighting a Table Row on Hover
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You have a table consisting of a few rows and columns. You want a row to be highlighted when the mouse pointer is moved over it.
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Let s make an HTML file that contains a table element with some rows and columns elements (th, td, tr) defined in it. The HTML file appears as shown here:
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CHAPTER 7 DEALING WITH TABLES
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<body> <table border="1"> <thead> <tr><th>Roll</th><th>Name</th><th>Marks</th></tr> </thead> <tbody> <tr><td>101</td><td>John</td><td>87</td></tr> <tr><td>102</td><td>Naman</td><td>90</td></tr> <tr><td>103</td><td>Chirag</td><td>85</td></tr> </tbody> </table> </body> Let s define a style rule .hover in the style sheet file style.css to apply style properties to the hovered-on row. The style rule may appear as shown here: style.css .hover { background-color: #00f; color: #fff; } The jQuery code to apply the hovering effect to the table rows is shown here: $(document).ready(function() { $('tbody tr').hover( function(){ $(this).find('td').addClass('hover'); }, function(){ $(this).find('td').removeClass('hover'); } ); });
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In the preceding HTML file we see that a table with a border of 1px is defined that has three column headings (defined using the th element): Roll, Name, and Marks. Also it contains three rows of student records. The table headings are nested inside the thead element and the body of the table (the rows that contain information) is nested inside tbody element In the style sheet file, the .hover style rule contains the background-color property set to #00f and the color property set to #fff to change the background and foreground color of the hovered-on row to blue and white, respectively. In the jQuery code, we attach the hover() event to the tr (row elements) that are nested inside the tbody element, as we want only the rows that contain student information to be hovered on, and not the row that contains column headings. In the event-handling function of the hover event, we search for the td elements of the hovered-on row and apply the properties defined in the style rule .hover (that exists in the style sheet file style.css) to change their background and foreground colors to blue and white, respectively, so as to highlight them. Initially, the table may appear as shown in Figure 7-1
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CHAPTER 7 DEALING WITH TABLES
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Figure 7-1. Table consisting of a few rows and columns When the mouse pointer moves over any row, that row will be highlighted as shown in Figure 7-2.
Figure 7-2. The highlighted row on being hovered on
7-2. Highlighting Alternate Columns
Problem
You have a table consisting of a few rows and columns. You want alternate columns of the table to be highlighted.
Solution
For this solution, we will make use of the same HTML and style sheet file (style.css) that we used in the Recipe 7-1. The jQuery code to apply style properties defined in the style rule .hover to the alternate columns of the table is shown here: $(document).ready(function() { $('td:nth-child(odd)').addClass('hover'); });
How It Works
Since we use the :nth-child() method in the jQuery code, let s take a quick look at what it does and how you can use it.
CHAPTER 7 DEALING WITH TABLES
:nth-child()
This method is used for retrieving all elements that are the nth child of their parent. This method is onebased; that is, it begins counting from 1, and not 0. This method is different from the :eq() method in the following two ways: The :eq() method matches only a single element, whereas :nth-child() matches one for each parent with the specified index. The :eq() method is zero-based; that is, it begins counting from zero, whereas :nth-child() is one-based (it begins counting from one).
For example, $('tr:nth-child(3)'); will select all the tr elements that are third child of their parent (which may be the tbody or table element); that is, it will select the third row of the table. Similarly, the statement $('tr:nth-child(even)'); will select all the even rows of the table. In the preceding jQuery code, the statement $('td:nth-child(odd)').addClass('hover'); will select all the odd columns of the table (in other words, each td that is an odd child of its parent) and apply the style properties defined in the style rule hover to them, changing their background color to blue and their foreground color to white, as shown in Figure 7-3.
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