This is a handy piece of code that I used last year in one of my projects. I had scheduled to post it but it was just after I saw this question at StackOverflow that I decided to write about it. So here it is…
Let’s say you want a nice UI experience and to achieve that you wanna colorize/highlight a table row according to a given value present in a column of this row.
This is a simple task when we use jQuery.
I use the WebGrid that comes with ASP.NET MVC to display data on a web page using an HTML <table> element. It’s available in the namespace System.Web.Helpers. The approach described in this post is useful not only with the WebGrid but with any framework/language you use to output HTML code since the manipulation is done on the client side with jQuery.
Take this screen as an example:
We want hide the last column “Active” and color the row which has a value Yes in this same column.
The above statement can be accomplished with the following code:
(function ($)
{ hideColumnColorRow = function (column)
{ $('td:nth-child(' + column + '),th:nth-child( ' + column + ')').hide(); $('tr').find('td:nth-child(' + column + '):contains(Yes)').parent().css('backgroundColor', 'LightGreen'); // Could be an hexadecimal value as #EE3B3B };
})(jQuery);
The hideColumnColorRow function* takes the column number as a parameter. It hides the column <td> and its header <th> using jQuery’s supper useful nth-child selector. Then for each table row <tr> it traverses the row’s columns and looks at the value of each column using :contains selector. If it finds a value = ‘Yes’ it’ll assign a background color to the column’s parent, that in this case is the <tr> (the row) using its CSS backgroundColor property.
So, taking Figure 1 as an example, the above code can be used in an ASP.NET MVC view this way:
<script type="text/javascript"> $(document).ready(function ()
{ hideColumnColorRow(5); // Hiding the 5th column and colorizing the row for which this column has a value = Yes
});
</script>
* I’ve placed the jQuery/JavaScript function inside a file named custom.js. It resides inside the Scripts folder of the sample app available here. There’s no need to reference this script file in the view page because with the introduction of ASP.NET 4.5 we now have an all new Bundling and Minification Support for CSS and JavaScript files.
When the the app is run, this is the result:
This is a really interesting requirement that one can implement in no time thanks to the power of jQuery. jQuery is one of the most fascinating things when we talk about software development. Its creator “John Resig” should be awarded a Computer Science Nobel Prize if that existed. Well it could be the Turing Award.
Anyone should take a look at jQuery and start using it as early as possible. It’s a must have today. I simply love it!
Source code
I’ve put together a sample ASP.NET MVC 4 (uses NET Framework 4.5) so that you can try this out. You can run the app using the recently launched Visual Studio 11 Beta. You can download the free Visual Studio 11 Express Beta for Web here and the app code here.
Hope it helps.
Figure 1 - Sublime Text 2 Dictionary menu option listing the pt_BR dictionary just added
It works great even if you don’t want to purchase it… take it easy.
Figure 1 - MP3 Scan+Repair main screen
Figure 2 - MP3 Scan+Repair listing the files and their respective problems
