Intro to jQuery: The Power Of jQuery Selectors

How to select element?

In jQuery, we select an element with $().

$("Selector Name")

Selecting with "$" is very similar to querySelector and querySelectorAll. In that we provide a CSS style selector. Then, jQuery will return all matching element.

I updated the jQuery Demo HTML page a little by adding a <a> tag and id "test" in the list.

If I want to select the h1, I just need to type $("h1")[0] in the console, and it will return us the h1.

If I want to select the link, I just need to type $("a")[0], and it will return the link.

If I want to select the list with special id, I just need to type $("#test")[0], and it will return that list.

Moreover, selecting element with the dollar sign in jQuery will return a list even if there's only one item. And it is much shorter and easier to wirte syntax.

How to manipulate style?

The .css() method is jQuery's interface to styling.

$(select).css(property, value)

If I want to style the h1 to be pink, I just need to write $("h1").css("color", "pink").

If I want to add a background and a border as well as change the color, I will pass in an object with styles.

In addition, we can style multiple elements at once.

If I want to change all list item color to be purple, I will do that:

The .css() method is very powerful because we can change individual properties and also pass on an object full of key pairs. With jQuery, if I have a collection of elements, it automatically loops over that and applies .css() to every single one.

Comments

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...

Intro to Backend: Is Browser The Only Place To Send HTTP Request?

Today, I begin to learn the second part of web develop course: backend. Frontend is the stuff that we can see and interactive with, such as HTML, CSS, and JS. We can type our code, style our page, or write some function to make interaction. However, backend is everything else. For example, we type Target web address in the Internet Browser. As we hit "enter", there are a few steps to go through: 1. The HTTP request is sent to a particular server's IP address. 2. The server figures out what to send us 3. It sends a HTTP response back to us Those process we are hard to see, and it happens in less than one second. The instructor said that the browser is not the only place to send the HTTP request, and there are so many choices out there. In this learning course, we are going to use Postman App . Postman allows us to make HTTP requests and viewer responses. It is really for developers to understand how things are working or debug something. In the P...

My Story: A Mommy Start To Learn Code From Zero

From Google Image I am not a programmer, and I thought I would never become one. Everytime I see someone is coding, I think he or she must be very talent. For me, coding is a very difficult subject to learn. Not only the language has so many rules, but also the logical reasoning behind the language is complex. In my graduated school, I knew many friends who didn't have any coding background, but they are doing programmer or developer jobs now. Some of them went to school to study coding, and some of them learned to code by themselves. Their stories are so impressive. I wasn't ready to learn code until I finished my first Chinese book "留学，我的青春呀!" recently. I always want to be a writer and write my own book. I started writing blog three years ago, and I updated my post two to three times every week. As I enjoyed writing , I started to get some followers, likes, and good comments on my blog. Then, I decided to plan my first book. My First...

Learn Bootcamp From Zero

Search This Blog