Viewed k times. I had such a hard time searching for info on the operator. The PHP version has been very useful as a go-to for closing dupes. I'm of the opinion that this should, barring an official policy change, remain.
But the wiki doesn't seem an appropriate place for this content. It seems, despite the lack of potential for any 'answers' like enough a 'canonical question' that I'd be tempted to reopen.
Though I'd yield to a mod's review. David Thomas: Unfortunately, tag wikis still suck. This is why even the book question remains a question today. That's the idea here. It's much simpler to compile a list of common questions in a community wiki format than ask a very broad set of questions as you edited it and have to browse dozens of answers trying to find the one you want. I'll go with community on this one, but so far, it seems people generally like it the way it is.
Active Oldest Votes. Basic keywords and general expressions this keyword: How does the "this" keyword work? What's the yield keyword in JavaScript? What is array literal notation in javascript and when should you use it? What do square brackets around a property name in an object literal mean? In this module we are explicitly talking about client-side JavaScript.
Server-side code on the other hand is run on the server, then its results are downloaded and displayed in the browser. NET and JavaScript can also be used as a server-side language, for example in the popular Node. Server-side code dynamically generates new content on the server, e. The meaning is slightly different in the two contexts, but related, and both approaches server-side and client-side usually work together.
A web page with no dynamically updating content is referred to as static — it just shows the same content all the time. Let's learn how this works. Note: If your example doesn't seem to work, go through the steps again and check that you did everything right.
Did you save your local copy of the starting code as a. Did you enter the JavaScript exactly as shown? JavaScript is case sensitive, and very fussy, so you need to enter the syntax exactly as shown, otherwise it may not work. Note: You can see this version on GitHub as apply-javascript-internal. This works great, but what if we wanted to put our JavaScript in an external file?
Let's explore this now. Note: You can see this version on GitHub as apply-javascript-external. It might look something like this:. Please don't do this, however. In this case the addEventListener function allows you to select all the buttons using one instruction.
The code we used above to serve this purpose looks like this:. This might be a bit longer than the onclick attribute, but it will work for all buttons — no matter how many are on the page, nor how many are added or removed. The JavaScript does not need to be changed. Note: Try editing your version of apply-javascript.
When you reload, you should find that all of the buttons when clicked will create a paragraph. Neat, huh? There are a number of issues involved with getting scripts to load at the right time. Nothing is as simple as it seems! A common problem is that all the HTML on a page is loaded in the order in which it appears. If you are using JavaScript to manipulate elements on the page or more accurately, the Document Object Model , your code won't work if the JavaScript is loaded and parsed before the HTML you are trying to do something to.
In the above code examples, in the internal and external examples the JavaScript is loaded and run in the head of the document, before the HTML body is parsed. This could cause an error, so we've used some constructs to get around it.
The JavaScript inside this block will not run until after that event is fired, therefore the error is avoided you'll learn about events later in the course.
Note: In the external case, we did not need to use the DOMContentLoaded event because the defer attribute solved the problem for us. We didn't use the defer solution for the internal JavaScript example because defer only works for external scripts. An old-fashioned solution to this problem used to be to put your script element right at the bottom of the body e.
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The use of this phrase has also been used to locate those with casting potential on news specials hosted by Chris Hansen. When carrying on a conversation with a grown man, he actually responded to something that I said with the following " JS man JS ".
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