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CHAPTER 9 USING PLUGINS
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I have used the Datepicker plugin for this recipe. Let s download its JavaScript file ui.datepicker.js and its CSS style sheet file ui.datepicker.css from jqueryui.com/demos/datepicker/. Let s create an HTML file that displays an input text field nested inside the div element class demo . The input text field is assigned the id datepicker. The HTML file includes the downloaded JavaScript file and links the CSS style sheet file. The HTML file may appear as shown below: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>JQuery Examples</title> <link rel="stylesheet" href="ui.datepicker.css" type="text/css" media="screen" /> <script src="jquery-1[1].3.2.js" type="text/javascript"></script> <script src="ui.datepicker.js" type="text/javascript"></script> <script src="d1.js" type="text/javascript"></script> </head> <body> <div class=demo> <p>Date: <input id="datepicker"/></p></div> </body> </html> The jQuery code to invoke the datepicker() method of the Datepicker plugin is as shown below: $(document).ready(function() { $("#datepicker").datepicker(); });
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On clicking inside the text box, the calendar of the current month will appear as shown in Figure 9-19. We can select the Next or Prev link to see the calendar of the next or previous month.
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Figure 9-19. Calendar of current month displayed
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CHAPTER 9 USING PLUGINS
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On selecting a date, it will be automatically entered in the input text field as shown in Figure 9-20. The date is entered in format: mm/dd/yyyy.
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Figure 9-20. Selected date appears in the text box To get the date in the desired format, we make use of the dateFormat option. The jQuery code to get the date in the format yy-mm-dd is as shown below: $(document).ready(function() { $("#datepicker").datepicker({dateFormat: 'yy-mm-dd'}); }); Now, the selected date will appear in the specified format as shown in Figure 9-21.
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Figure 9-21. Date in the selected format
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9-9. Sorting tables
Problem
You have a table and you want the table be sorted on the basis of a selected column.
Solution
I have used Tablesorter plugin for this recipe. Let s download its JavaScript file jquery.tablesorter.js from tablesorter.com. Let s create an HTML file that includes the downloaded JavaScript file and that contains a table element to display Roll number, Name and Marks of 15 students. The HTML file may appear as shown below: <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title>JQuery Examples</title> <script src="jquery-1[1].3.2.js" type="text/javascript"></script> <script src="jquery.tablesorter.js" type="text/javascript"></script> <script src="d1.js" type="text/javascript"></script> </head> </head> <body>
CHAPTER 9 USING PLUGINS
<table border="1" class="studrec"> <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> <tr><td>104</td><td>David</td><td>92</td></tr> <tr><td>105</td><td>Kelly</td><td>81</td></tr> <tr><td>106</td><td>Charles</td><td>77</td></tr> <tr><td>107</td><td>Jerry</td><td>91</td></tr> <tr><td>108</td><td>Beth</td><td>75</td></tr> <tr><td>109</td><td>Caroline</td><td>82</td></tr> <tr><td>110</td><td>Hanen</td><td>71</td></tr> <tr><td>111</td><td>Douglas</td><td>57</td></tr> <tr><td>112</td><td>Tim</td><td>86</td></tr> <tr><td>113</td><td>Michael</td><td>68</td></tr> <tr><td>114</td><td>Kimbley</td><td>88</td></tr> <tr><td>115</td><td>Christina</td><td>72</td></tr> </tbody> </table> </body> </html> We can see that the above HTML code includes the table element of class studrec that displays information concerning the fifteen students. The jQuery code invokes the tablesorter() method on the table element of id studrec: $(document).ready(function() { $('.studrec').tablesorter(); });
How It Works
On execution of the above jQuery code, initially the table will be appear with rows in its original sequence as shown in Figure 9-22.
CHAPTER 9 USING PLUGINS
Figure 9-22. Original table On selecting a column heading, the table will be sorted on the basis of the selected column. If we select the Name column heading, the table will be sorted in the alphabetical order of the names as shown in Figure 9-23.
Figure 9-23. Table sorted on name
CHAPTER 9 USING PLUGINS
Summary
In this chapter we have seen different plugins that help in performing so many tasks without writing any code like filtering on any column of a table, annotating an image with comments, dragging and dropping table rows, getting, serializing and clearing form controls, submitting a form via Ajax, finding the exact position and dimension of an element, displaying images in a carousel, selecting a date with a datepicker and sorting tables. In the next chapter, we will see several recipes that rely heavily on CSS. We will learn about distinguishing HTML elements, applying styles to an element nested inside another element, indenting paragraphs, applying an initial cap to a paragraph, removing the gap between a heading and paragraph, applying styles to heading text and more.
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C H A P T E R 10
Using CSS
In this final chapter I provide a set of recipes that rely heavily on CSS. These recipes are a complement to the others in this book, as CSS is never far away from a JavaScript developer's work. These are some of the CSS techniques I use most often, so I've included them here for your quick reference while developing your own web applications. In this chapter I provide the following recipes: Distinguishing HTML elements Applying styles to an element nested inside another element Indenting paragraphs Applying an initial cap to a paragraph Removing the gap between heading and paragraph Applying styles to heading text Indenting the first line of multiple paragraphs Creating paragraphs with hanging indents Creating a bordered pull quote Creating a pull quote with images Applying list properties to list items Applying styles to only selected list items Placing dividers between list items Applying image markers to the list Creating inline lists Applying styles to hyperlinks and mailto Assigning different dimensions to HTML elements Placing HTML elements
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