Page 64 - DCAP202_Fundamentals of Web Programming

Unit 5: Creating Tables

 The rows and cols attributes: The attributes of the FRAMESET element are COLS (columns) Notes
and ROWS. They determine how many frames the frame set is divided into. These attributes
may be blank, or may consist of a list of one or more values separated by commas or
spaces. Each such value determines the width (for columns) and height (for rows) of the
regions; the number of width and height values supplied determines how many rows and
columns, respectively, are created. The default for each is one.
For example if you have:

<FRAMESET cols=”20%,30%,50%”>
in which there is no ROWS value, the frame set is divided vertically into three regions: the
first region’s width is 20% of the current frame set (or browser window if this frame set is
at the top level), the second region’s width is 30%, and the third region’s width is 50%.
When there is only one frame set in the document, these widths apply to the entire
browser window. Similarly, when there is a ROWS value but no COLS value, the frame set
is divided horizontally into regions. When values are supplied for both attributes, the
frame set is divided into a grid of rows and columns.
The ROWS and COLS attributes take comma-separated lists of values. These values can be
absolute pixel values, percentage values between 1 and 100, or relative scaling values. The
number of rows and columns is implicit in the number of values in the respective list.
Since the total height of all the rows must equal the height of the window, row heights
might be normalized to achieve this.

Notes If the rows (or cols) attribute values are unspecified, then the number of rows (or
columns) is assumed to be one, and it may be arbitrarily sized to fit.
 Syntax of Value List
value
A simple numeric value is assumed to be a fixed size in pixels. The result of this value
varies with the size of a viewer’s window. Fixed pixel values are usually used with one or
more of the relative size values described below. You might use a fixed value if you want
a graphic, such as an image map, to fill an entire frame and you want to ensure that the
frame is big enough to display the entire image. User agents can be expected to override
a specified pixel value to ensure that the total proportions of a frame are 100% of the width
and height of a user’s window.

value%
This is a simple percentage value between 1 and 100. If the total is greater than 100, all
percentages are scaled down. If the total is less than 100, and relative-sized frames exist,
extra space is given to them. If there are no relative-sized frames, all percentages are
scaled up to match a total of 100%.

For example, suppose you assign the ROWS attribute a value of “50%,50%,50%”. Each
entry is 50%, which is one third of the sum of all the entries (150%), so the browser assigns
the frame sizes proportionately, giving each frame one third of the browser height.
value*
The value on this field is optional. A single ‘*’ character is a “relative-sized” frame and is
interpreted as a request to give the frame all remaining space. If multiple relative-sized
frames are specified, the remaining space is divided evenly among them. If there is a value

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