USING THE ROWSPAN AND COLSPAN ATTRIBUTES in VS .NET

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USING THE ROWSPAN AND COLSPAN ATTRIBUTES
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To change a cell s default characteristic of an intersection between a single row and column, you need to use a td element s attributes, rowspan and/or colspan. Each attribute is assigned a positive integer value that expands a cell to cover multiple rows or columns. Figure 6-6 shows a standard table made up of equal-size cells and a comparative table with expanded rows and columns.
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Figure 6-6: A table with equal-size cells and a table with rowspan and colspan.
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Figure 6-6 shows that the first cell in Row 2 in the bottom table took up the space of three cells in Row 2 in the top table. In Col 5 of the bottom table, both Row 1 and Row 2 were
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CHAPTER 6: DISPLAYING DATA WITH TABLES
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collapsed into a single cell taking up both rows. Importantly, the top table has ten cells and the bottom table has only seven cells. When you code tables with rowspan and colspan, you ll use fewer <td> tags compared to a table that does not (see RowColSpan.html in this chapter s folder at www.wiley.com/go/smashinghtml5).
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<!DOCTYPE HTML> <html> <head> <style type= text/css > caption { font-family: Arial Black , Gadget, sans-serif; color:#C60; } table { font-family:Verdana, Geneva, sans-serif; } td, tr { border-style:solid; border-width:thin; border-color:#ccc; width:120px; padding:5px; } </style> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <title>Colspan and Rowspan</title> </head> <body> <table> <caption> Rowspan and Colspan </caption> <tr> <td rowspan= 2 >Row A and Row B <td>Column 2a <td>Column 3a <td>Column 4a <tr> <td>Column 2b <td>Column 3b <td>Column 4b <tr> <td>Row C <td>Column 2c <td colspan= 2 >Column 3c and Column 4c </table> </body> </html>
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This example uses a very light gray border so that you can better see the spans vertically and horizontally. However, you don t need the borders to use spans. In fact, without borders,
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PART II: PAGES, SITES, AND DESIGNS
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it can be difficult to distinguish where the spans actually exist, which can be a good thing. Figure 6-7 shows the actual table with the two spans.
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Figure 6-7: Adding vertical and horizontal spans.
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You can see that the table in Figure 6-7 has 10 cells where a full 4-by-3 table would have 12. Likewise, in the listing, you can see ten <td> tags. Both colspan and rowspan can be a little tricky, but if you think of them in terms of cell mergers, they re a little easier to understand and work with.
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PRACTICAL SPANS IN TABLES
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122 When creating complex tables using colspan and rowspan, the exercise may seem to be one in futility because a practical application doesn t seem that obvious. Alternatively, you may look to do the whole thing in CSS3 without any use of table elements or attributes. So, the following walks through a simple but typical scenario where spanning cells is a practical solution. Consider a Web development/design firm that has set up project management using tables as a simple way to keep track of a project s progress. The production team is divided into the following groups, each with a separate record: Team coordinator (1) Design team (4) Rich interactive application (RIA) design (2) Front-end development (3) Back-end development (2) The columns for the project include the following: Task Project Team members Due date
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CHAPTER 6: DISPLAYING DATA WITH TABLES
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That should be simple enough to understand and complex enough to be useful. The irony of making this table is in adding the spans where only one item is in the cell. It s almost counterintuitive because the column for the team members will have several rows within the other cells that have a rowspan the size of the team size. The following program (SpanProject. html in this chapter s folder at www.wiley.com/go/smashinghtml5) illustrates how this is done.
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<!DOCTYPE HTML> <html> <head> <style type= text/css > /* F2F0E6,595443,A6A08D,3A3F59,8D91A6 */ caption { font-family: Arial Black , Gadget, sans-serif; color:#3A3F59; } table { font-family:Verdana, Geneva, sans-serif; background-color:#F2F0E6; padding:5px; border-collapse:collapse; } td, tr { padding-right:8px; font-size:11px; border-collapse:collapse; } .bluish { background-color:#8D91A6; } .brownish { background-color:#A6A08D; } </style> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <title>Project Tracker</title> </head> <body> <table> <caption> Project Plan </caption> <tr> <th>Task <th>Project <th>Team <th>Due Date <tr class= bluish > <td>Coordinator <td>Cold Fire
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