how to connect barcode reader to java application Figure 7-3. Table with odd-numbered columns highlighted in Font

Paint PDF 417 in Font Figure 7-3. Table with odd-numbered columns highlighted

Figure 7-3. Table with odd-numbered columns highlighted
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Highlighting Alternate Rows
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To highlight alternate rows of the table, we will modify the jQuery code as shown here: $(document).ready(function() { $('table tr:odd').addClass('hover'); });
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CHAPTER 7 DEALING WITH TABLES
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The preceding jQuery code will select all the odd rows of the table and apply the style properties defined in the style rule .hover to them so as to highlight them as shown in Figure 7-4.
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Figure 7-4. Table with alternate rows highlighted
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Highlighting the Column that Is Hovered On
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You want to highlight only columns whose headings are hovered on; that is, when the mouse pointer moves over any column heading, you want that column to be highlighted. The jQuery code may appear as shown here: $(document).ready(function() { $('th').hover( function(){ var colindex=$(this).parent().children().index(this); $('table td:nth-child('+(colindex+1)+')').addClass('hover'); }, function(){ $('table tr').children().removeClass('hover'); } ); }); Before we delve into the jQuery code, let s look at the .index() method that is used in the code:
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.index()
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This method searches every matched element for the element that s passed within its parameter, and returns the ordinal index of that passed element, if found, starting with 0. The index() function returns 1 if the passed element is not found in the matched set. If a jQuery object is passed as a parameter to index(), then only the first element of that object is checked. Syntax: .index(element) Now let s look at the jQuery code itself. We first attach the hover event to the table heading (th) elements. When the user hovers over a table heading, we find out the index (column number) of its column and store that index location in a variable colindex. The .index() method uses zero-based counting, which means it begins counting from zero. So an index of 0 means the first column heading is hovered over, an index of 1 means the second column heading is hovered over, and so on.
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CHAPTER 7 DEALING WITH TABLES
We can then apply the style properties defined in the style rule .hover to the column whose index location is stored in the variable colindex. Since the :nth-child() method is one-based; that is, it begins counting from one (as compared to the .index() method, which begins from zero), we need to increment the value stored in variable colindex by one before applying the style rule .hover to the column represented by colindex in the event-handling function of the hover event. In the event-handling function, which is invoked when the mouse pointer is moved away from the column heading, we remove the style properties defined in the style rule .hover from all the rows of the table. The contents of the hovered-over column are highlighted as shown in Figure 7-5.
Figure 7-5. Contents of the hover-over column are highlighted.
Highlighting the Column Heading While Hovering
In the preceding example, we see that the column contents are highlighted when the column heading is hovered over, but the column heading is not highlighted; it appears as it was initially. We need to add one more statement (shown in bold in the jQuery code) to highlight the column heading as well: $(document).ready(function() { $('th').hover( function(){ var colindex=$(this).parent().children().index(this); $(this).addClass('hover'); $('table td:nth-child('+(colindex+1)+')').addClass('hover'); }, function(){ $('table tr').children().removeClass('hover'); } ); }); The statement $(this).addClass('hover'); will apply the style properties defined in the style rule .hover to the column heading too when it is hovered over, as shown in Figure 7-6.
CHAPTER 7 DEALING WITH TABLES
Figure 7-6. Column contents and column heading are highlighted when the heading is hovered over.
Highlighting Individual Cells of the Table When Hovered On
When any cell of the table except a column heading is hovered over, you want it to be highlighted. The jQuery code for doing this appears as shown here: $(document).ready(function() { $('td').hover( function(){ $(this).addClass('hover'); }, function(){ $('table tr').children().removeClass('hover'); } ); }); We can see that this time the hover event is attached to the td elements so that if any cell is hovered over (except the column headings), the properties defined in the style rule .hover are applied to it to highlight it as shown in Figure 7-7.
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