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Paint PDF417 in Font DEALING WITH TABLES

CHAPTER 7 DEALING WITH TABLES
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and store it in a variable rindex. Then, with the help of a for loop we display the next five rows; that is, the rows underlying the row heading (of the class name studgroup) are displayed. Finally, for the hover event we apply the properties defined in the style rule hover to highlight the hovered-over row. When the mouse pointer is moved away from the hovered-over row, its minus icon is replaced with a plus icon using the .css() method, and the background-repeat and background-position properties are set to no-repeat and left, respectively, to make the plus icon appear only once, on left side of the row. We then hide all of the rows of the table except the rows that show the range of roll numbers, along with a plus icon (this is what we want when the mouse pointer is moved away from the hovered-over row). Finally, we remove the properties defined in the .hover style rule to make the row appear as it was initially when mouse pointer is moved away. On execution of the preceding jQuery code, we find three rows Roll 101-105, Roll 106-110, and Roll 111-115 that designate the group of records underneath them. Also, we will find that on left of each row is a minus icon indicating that the rows are currently collapsed, as shown in Figure 7-26.
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Figure 7-26. Rows designating a group of records underneath them, along with a plus icon on their left When we hover on any row, that row will be highlighted, the associated student records will be displayed, and the plus icon will be replaced by a minus icon in the hovered-over row, as shown in Figure 7-27.
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Figure 7-27. The hovered-over row displays its records, and the plus icon is replaced by the minus icon. Similarly, if we hover over the row Roll 106-110, it will be highlighted, the associated student records will be displayed, and the plus icon will be replaced by a minus icon in the hovered-over row; at the same time, the row we hovered over previously (which has now lost focus) will get its plus icon back (see Figure 7-28).
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CHAPTER 7 DEALING WITH TABLES
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Figure 7-28. The row gets is plus icon back when it returns to collapsed mode
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7-8. Sorting List Items
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You have an unordered list consisting of a few list items, which you want to sort.
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Let s make an HTML file that consists of an unordered list: <body> <ul> <li>Tea</li> <li>Coffee</li> <li>Pepsi</li> <li>Energy Drink</li> <li>Soup</li> </ul> </body> The HTML file, when opened in a browser, will show the list items as in Figure 7-29.
Figure 7-29. Unsorted list items
CHAPTER 7 DEALING WITH TABLES
The jQuery code to sort the list items is shown here: $(document).ready(function() { var drinks = $('ul').children('li').get(); drinks.sort(function(a, b) { var val1 = $(a).text().toUpperCase(); var val2 = $(b).text().toUpperCase(); return (val1 < val2) -1 : (val1 > val2) 1 : 0; }); $.each(drinks, function(index, row) { $('ul').append(row); }); });
How It Works
Looking at our jQuery code, we first get all the list items that are children of the unordered list and store them in a variable drinks. That is, drinks will become an array containing the list item's text. We then invoke the .sort() function on the drinks array, which repeatedly takes two elements of the array at a time and assigns them to its parameters a and b for comparison. The sort function will return a value depending on the values assigned to the parameters drinks and b. Note the following details of th function: When the function returns <0, it means the second value is larger than the first and is hence pushed down. When the function returns =0, it means both values are equal and there's no need to change the sort order. When the function returns >0, it means the first value is larger than the second and must be pushed down.
Before we invoke the sorting algorithm, we convert the two array elements passed to the sort function to uppercase. We then use the sorting algorithm to return the values in the bulleted list, which will sort the list items in alphabetical (ascending) order. Finally, the each() function operates on the array drinks (that contains sorted list items); we extract each element stored in the array and append it to the unordered list element. That is, we re appending the sorted list items to the unordered list element for display. On execution of the preceding jQuery code, we get the sorted list items shown in Figure 7-30.
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