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Grouping columns

From: HTML Essential Training

Video: Grouping columns

Using the colgroup and col elements, you can apply styles to columns and groups of columns in your tables. Let's make a working copy of table-semantic.html, and we'll go ahead and see how this feature works. I'll call this one -working, open that in the text editor. I'm just going to page through this real quick for those of you who are typing along at home. And we'll go ahead and open this in our browser as well. And let's take a look at how this feature works.

Grouping columns

Using the colgroup and col elements, you can apply styles to columns and groups of columns in your tables. Let's make a working copy of table-semantic.html, and we'll go ahead and see how this feature works. I'll call this one -working, open that in the text editor. I'm just going to page through this real quick for those of you who are typing along at home. And we'll go ahead and open this in our browser as well. And let's take a look at how this feature works.

If we come down here into the table and right after caption and before thead-- and this element always must go after caption if there is any, otherwise right at the top of the table before any thead, tbody, tfoot, tr elements. And we come in here and we can type colgroup. I'll put an end tag also. And inside the colgroup we get columns, which are indicated with the col element. I'm just going to give them class as well.

I'll go ahead and copy and paste, because that will make this go faster. So what we have here is a colgroup element, which is a way of grouping columns together. See, the rows are already grouped together, because we have these elements. So it's possible to style a row just by styling tr. But there is no other way to style a column. If I wanted to style a column, I would have to put a Column 1 class on all of the Column 1 elements. But if I don't want to do that, there wasn't any way to that. So colgroup was invented to style columns.

So col, the first one represents this first column; the second one represents the second column; and the third one represents this third column. So now I can go and style these because I've given them class names: col1, col2, and col3. So I can style those class names with the class selector--col1--and let's just give it a background color. And I will make copies of these and give them different colors. Now when I save this and reload my browser, you notice these columns now have their own colors.

You notice that the footer is not styled, because the footer already has a color in it. If I take that color out of the footer and save that and reload, you'll see the footer gets the color as well. So the position of the col elements within the colgroup element are used to represent the position of the column. So the first col element represents the first column in the table, and likewise. On the other hand, it's possible for a col element to represent more than one adjacent columns, by using the span attribute.

So if I say span=2 and then take out one of these other columns, when I reload, now that first col element represents two adjacent columns. That allows you to style groups of columns rather than just individual columns. So the colgroup feature is very useful for applying style to columns or groups of columns in your tables.

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This video is part of

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HTML Essential Training

82 video lessons · 98235 viewers

Bill Weinman
Author

 
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  1. 5m 24s
    1. Welcome
      56s
    2. Using the exercise files
      1m 37s
    3. What you need to know about this course
      2m 51s
  2. 22m 0s
    1. What is HTML?
      4m 12s
    2. Examining the structure of an HTML document
      7m 50s
    3. Understanding tags and containers
      6m 4s
    4. Exploring content models in HTML5
      2m 23s
    5. Looking at obsolete elements
      1m 31s
  3. 27m 19s
    1. Understanding whitespace and comments
      3m 53s
    2. Displaying text with paragraphs
      3m 37s
    3. Applying style
      8m 5s
    4. Using block and inline tags
      6m 34s
    5. Displaying characters with references
      5m 10s
  4. 16m 36s
    1. Exploring the front matter of HTML
      2m 9s
    2. Applying CSS to your document
      3m 59s
    3. Adding scripting elements
      4m 54s
    4. Using the meta tag
      3m 34s
    5. Optimizing your page for search engines
      2m 0s
  5. 24m 59s
    1. Controlling line breaks and spaces
      2m 46s
    2. Exploring phrase elements
      1m 44s
    3. Using font markup elements
      1m 5s
    4. Highlighting text with mark
      1m 29s
    5. Adding headings
      1m 38s
    6. Using quotations and quote marks
      3m 2s
    7. Exploring preformatted text
      1m 45s
    8. Formatting lists
      2m 28s
    9. Forcing text direction
      3m 49s
    10. Suggesting word-break opportunities
      2m 29s
    11. Annotating East Asian languages
      2m 44s
  6. 29m 15s
    1. Introducing CSS
      55s
    2. Understanding CSS placement
      6m 55s
    3. Exploring CSS syntax
      10m 34s
    4. Understanding CSS units of measure
      3m 3s
    5. Some CSS examples
      7m 48s
  7. 22m 5s
    1. Using images
      4m 13s
    2. Flowing text around an image
      4m 55s
    3. Breaking lines around an image
      3m 3s
    4. Aligning images
      5m 25s
    5. Mapping links in an image
      4m 29s
  8. 22m 28s
    1. Understanding URLs
      2m 41s
    2. Working with hyperlinks
      3m 28s
    3. Using relative URLs
      4m 20s
    4. Specifying a base URL
      2m 19s
    5. Linking within a page
      4m 12s
    6. Using image links
      5m 28s
  9. 17m 2s
    1. Exploring list types
      3m 52s
    2. List elements in depth
      7m 44s
    3. Using text menus with unordered lists
      5m 26s
  10. 15m 30s
    1. Introduction to HTML semantics
      4m 9s
    2. Exploring an example
      4m 56s
    3. Marking up figures and illustrations
      2m 33s
    4. Creating collapsible details
      3m 52s
  11. 11m 18s
    1. Embedding audio
      5m 19s
    2. Embedding video
      5m 59s
  12. 11m 53s
    1. Creating ad-hoc Document Object Model (DOM) data with the data-* attribute
      4m 53s
    2. Displaying relative values with meter
      2m 57s
    3. Creating dynamic progress indicators
      4m 3s
  13. 4m 49s
    1. Overview of HTML5 microdata
      1m 8s
    2. Exploring an example with microdata
      3m 41s
  14. 7m 3s
    1. Understanding outlines
      52s
    2. A demonstration of outlining
      6m 11s
  15. 13m 1s
    1. Table basics
      7m 29s
    2. Exploring the semantic parts of a table
      2m 32s
    3. Grouping columns
      3m 0s
  16. 9m 55s
    1. Frames overview
      54s
    2. Using traditional frames
      4m 26s
    3. Exploring inline frames using iframe
      2m 7s
    4. Simulating frames with CSS
      2m 28s
  17. 53m 7s
    1. Introducing forms
      10m 24s
    2. Using text elements
      10m 12s
    3. Using checkboxes and radio buttons
      2m 37s
    4. Creating selection lists and dropdown lists
      5m 14s
    5. Submit and button elements
      8m 48s
    6. Using an image as a submit button
      2m 15s
    7. Keeping context with the hidden element
      3m 0s
    8. Setting tab order
      2m 7s
    9. Preloading an autocomplete list using the datalist feature
      5m 26s
    10. Displaying results with output
      3m 4s
  18. 19m 47s
    1. Touring a complete site
      2m 14s
    2. Touring the HTML
      8m 44s
    3. Touring the CSS
      8m 49s
  19. 29s
    1. Goodbye
      29s

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