Skip to main content

Project Study: Five Advanced CSS Selectors You Should Know

Today, I am going to share five advanced CSS selectors from Udemy course. Then, I will create a simple project to explain how we apply each selectors.

Those five advanced selectors are:
  • Star Selector: Whatever we do, it will apply to every single element.
  • Descendant Selector: The way that descendant selector works is that it takes two or more tag names or two or more selectors and you chain them together.
  • Adjacent Selector: With adjacent selector, it will let us select elements that comes after another element.
  • Attribute Selector: The attribute selector is a way to select elements based of any attribute.
  • Nth of Type: The way of nth of type works is it takes a number like three or five and then it selects every end of a specific element. So if I want to select every fifth paragraph, I could use nth of type.

I know it is not clear to understand without apply them in a project and see how they work.

Now I am going to create a simple web page named "Selector Demo", which includes some lists and hyperlinks.

The HTML Part:


The Web page looks like:

Now I am going to apply those five selectors in the CSS file.


  • Star Selector
I want every element on the page has a border, so the simple way is to use star selector:
*{border: 1px solid lightgrey:}
  • Descendant Selector
As we can see, there are three hyperlinks on the last list, and I want to make those links text in red color, so I use descendant selector:
li a{ color: red:}.
  • Adjacent Selector
There are two h4 headers, one is "Popular Vegetables", and the other one is "Popular Sites". Under each header, there is a short list. I want to add a blue border to each list. Therefore, I use adjacent selector: 
h4+ul { border: 4px solid blue;}.
  • Attribute Selector
There are four hyperlinks on this page, and two of them are linking to Google. I want to give a yellow background to Google links. As we know, the hyperlink attribute is " a href=", so the attribute selector will be 
a[href="http://www.google.com"] { background: yellow;}
  • Nth of Type
I build three lists on the page. I want the even number on every list has a green background, so I use the nth of type: 
li:nth-of-type(even) { background: green;}

The final outcome will be:



Labels:

Comments

Post a Comment

Popular posts from this blog

Intermediate Express.Js: Write Conditions and Loops In The EJS (study note)

We continue to use the app.js which we have build to be the study example. In the last post, we only add a simple EJS tag <%= thingVar %> inside h1 tag. This will match the "thing" to any "thing" request from the user. If Statement Today, the course shows us to write a simple if statement in the EJS file. I learn to apply it to my own app. In the if statement, if users send"/wantto/workout" request, the page will show a new content "Good Idea!". We wrote the if statement in the "diet.ejs" file, and we add "<% %>" tags around the code. We have to wrap every line of JavaScript anytime JavaScript starts and ends. Moreover, you may see there are two types of ejs tags here: <%= %> The one with equal sign. According to the course, when we add equal sign, the value that is returned inside of the tag will be rendered to the HTML page. it will be added to the HTML. For example, if we write ...
Post a Comment
Read more

Intermediate Express.js: How To Add Styles & Partials in EJS File?

So far, we only have simple HTML tags and ejs tags in each ejs file. Every template page has no style at all. And the basic HTML header and footer are also missing. Today, I learned how to add styles and partials in ejs file. Link Style Step One: Touch a Separate CSS file I create a new directory "Style" under the "EJSDemo" directory, then I add a new CSS file "app.css" inside "Style" folder. Step Two: Add app.use(express.static()) in the app.js I add app.use(express.static("style")) in the "app.js". This will tell Express.js to serve the content of "Style" directory. Step Three: Write styles in CSS file I simple give body an orange background color and set text color to be grey. Step Four: Link to CSS file in the EJS file I just add <link> tag to link the "app.css" file on the top of the h1 tag in each ejs template. As the result, when I run the app and...
Post a Comment
Read more

Express.js Study Note: Route Order Is Matters!

Last post, I have learned to develop my first Express App from the course. Basically,  it has three routes. When we type "/", "/bye" and "/cat", the app will receive the request and send the matched response to us. But, if we want to send a nice message when users type other texts after slash, what should we do? We can write a "*" route which will run whenever out app gets any request to any url aside from those three routes that we have already defined. app.get("*", function) In the App.js file, we add a new star route, and it will send you a new message whenever you type any undefined request. I run my app, and put some random texts after slash, and hit enter. All I get is "You are a star!". If we move the star route to the top of those three routes, what will happen? The instructor run the app, the result is even though we send the "/", "/bye" or "/cat" request, all we get...
Post a Comment
Read more