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9: Using Tables
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Figure 9-6 When you use the thead, tbody, and tfoot tags, styling table rows becomes a snap using colgroups enables you to apply styles and characteristics to entire sections of columns, as opposed to doing so individually
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Simply stated, the colgroup and col tags are ways to pass information about structure and style on to the browser in the beginning of the table in order to help render it
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The opening and closing colgroup tags enclose one or more columns in the group and can dictate how those columns should be rendered This means you can use the colgroup tag as a selector in your style sheet to format all the columns in that group the same way You can also add the span attribute to this tag to tell the browser how many columns should be included in the group
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If you had both colgroups and theads, the colgroups would be placed before the theads in your table structure
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In this example, the first colgroup contains five columns, while the second colgroup contains two columns You can see the colgroup tags are placed at the top of the table, before all the table rows and table cells
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<table border="1"> <colgroup span="5" id="group1"></colgroup> <colgroup span="2" id="group2"></colgroup> <tr> <td>
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Each colgroup in this example also has an ID assigned: group1 and group2 If you make formatting specifications in the corresponding ID style declaration, they take effect for all the columns in that group If you need to alter the width or alignment of specific columns in the group, you then only have to make the change once in the style sheet The following shows what a style sheet might look like to make all the columns in group1 be 50 pixels in width, while those in group2 are 25 pixels wide
colgroup#group1 {width:50px;} colgroup#group2 {width:25px}
This tells the browser to look for a colgroup with an ID name of group1, and then apply the corresponding style to it
In the following example, the group of five columns has each column set to be 75 pixels wide However, the fourth column (denoted with the class="col4" attribute) has that width overridden and reset to 25 pixels By default, text alignment is left The last column (col5) is the only one to have a background color
<style type="text/css"> colgroup#tuition {width: 75px;} colgroup col#books {width: 25px;} colgroup col#total {background-color: yellow;} </style> </head> <body> <table border=1> <colgroup span="5" id="tuition"> <col id="year"></col> <col id="base"></col> <col id="roomboard"></col> <col id="books"> <col id="total"> </colgroup> <tr> <td>
NOTE
As of this writing, the only aspects of cols or colgroups that can be styled are borders, background, width, and visibility Unfortunately, this means you can t use a colgroup to adjust the alignment of all the cells in that column (wouldn t that be nice!) The only way to do that is to add a class to each cell you want to style, and then use the text-align property with that class in your style sheet
Whether used in the colgroup or col tag, column width can be specified as demonstrated in Table 9-4
9: Using Tables
Value
pixels percentages
Description
Sets the width of each column in pixel dimensions Sets the width of each column in percentages, relative to the size of the entire table
Example
colgroup {width: 50px;} col {width: 20px;} colgroup {width: 50%;} col {width: 10%;}
Table 9-4
Setting the Column Width
Try This 9-2
Format Cell Content
Returning to the tripshtml page you began in Try This 9-1, let s format some of the individual cells and add a horizontal rule that spans the entire width of the table Goals for this project include
Changing the alignment of content within table cells Causing a cell to span across multiple columns
1 Open your text or HTML editor and open the file tripshtml created in Try This 9-1 2 Add a new row at the very top of the table 3 Add Sessions and Trip Details to the first row and format it to display like the following:
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