... today in this short but useful article, we will figure out how different program code is commented on. I will not say much, because if you are interested in this, then you have already faced the questions of this problem, and you have an idea of ​​it.

You have come to the address ... but a few words for clarity and the benefit of the case. You've probably seen how this is done with CSS code, since css is of most interest to many beginners, like me.

… Good!

But note that comments are also used in html and php... But most beginners get confused at the initial stage of their work with the site and do not know how to add the necessary explanations to themselves. After all, it happens so, for example, you need to deactivate for some time html code, and then again resume its function - it's easy to implement if you have made notes for yourself in the "margins", but you never know what.

But what should be remembered about "comments" in general - everything here is strictly dependent on which file you are working with specifically, and therefore the application code is different.

Commenting out the CSS code

a: hover, a: focus (color: # D5071E; text-decoration: Overline; / * UNDERLINE UP * /)

This is how you explain yourself to yourself. Or you can even comment out this css script altogether like this: just wrap

/ * CODE here * /

/ * a: hover, a: focus (color: # D5071E; text-decoration: underline; / * UNDERLINE * /) * /

I draw your attention to the fact that - you can comment out the full cycle of the css code in this way, but !! then you have to remove repeated comments / * UNDERLINE BOTTOM * /, or play with slashes, if the explanation is important))

Otherwise there will be an error !!

Note:

If you open the source code of the page - Ctrl + U and take a look ... we will see that the commented-out piece of css code is beautifully displayed in the generated document! this is if css was used (properties were set) directly in html

And, as you know, if you go from the source code by reference to the css document of your active template - all comments can be observed and studied)) if someone needs it. But this is unlikely)

English adverb (words) will be readable. Russian symbolism - no.

Commenting out the HTML code

The XML file is commented in the same way.

Important: always check the code provided in the articles, at least visually) otherwise there may be errors.

The usual carelessness in formatting can be time-consuming, for example, the COMMENTED code shown above is often erroneous: instead of two short hyphens, an em dash appears:

For your information:

as mentioned in the previous remark - so is the comment-out ... html code is displayed in the generated document!

Keep this in mind.

And here's another thing:

in addition to the fact that the commented code is displayed in the source code of the page (which means it is processed in some sense, although it will be invisible on the page too!) - it is better to remove some php functions in conjunction with html from the active document.

For example:

will be visible in the document and the functionit will work out its job wonderfully: that is, the information will not be seen in the frontend, but in the source - it will be clearly displayed! and this is a bespontovy request to the database: all this is a trifle, but you need to know!

It is possible to do this if you do not want to take out a piece of code from the document:

add before the necessary "extra" html code the opening... inline function ... and closing?> ...

In a word, this is how you can do it if the code is large:

**/ ?>

then the source will be clean!

Or more simply:

Let's comment out the function itself in the html document. The source code in these cases will be clean with respect to the development of functions!

how to comment out JavaScript

if (beingShown || shown) (// don "t trigger the animation again return;) else (// on the line apply ANY COMMENT // on the line apply ANY COMMENT // true;

For clarity, I grabbed this example JavaScript code in the net, slightly adjusting the punctuation. It doesn't matter ... The main thing is to understand the principle ...

As you understand the slash "//" is double, this is the SIGN of the comment ... ONE LINE!

The rest of the JS code is commented out like php, more on that below:

remark:

Commenting out the PHP code

... and ... here it is the same - slash-slash ... one-line.

But note that it can be annotated just like CSS-code.

... or so you can comment out - a one-line option, when we use NOT TWO SLASHES, but BECAR (hash) before the commented line:

... Naturally, you need to comment carefully in the code loop!

... or in the same way - similar to the above example for CSS ... i.e. this / * code * / commenting option will work for both CSS and JS codes!

But in this way, you can comment out a more voluminous explanation to the PHP code, somewhere between its main examples ...

You can also comment in php loops like this, if the code is mixed ... php and somehow html

Similar to above:

For example, some kind of function ... somewhere in the general code (or a loop in html):- you can comment out, that is, add your own label like this:

or so: a one-line option ...

Intelligence:

php code is not visible in any source codes !! only its functional result is visible - working off!

In general, that's all that I wanted to report today!

Now you can experiment ... Good luck.

And of course, read the articles of the site and subscribe:
I share my bitter experience - some knowledge, for your sweet well-being))

... the city of webmasters Mikhalika.ru© - Easily with WordPress

Michael 2016-05-05 1 HTML and CSS 2

How to write html comments in the code?

Today I will tell you how to make comments in the code in html. Comments are a very useful thing. They do not affect the execution of the code and the appearance of the pages in any way, and they cannot be seen in the source code of the page. In fact, comments can only be seen by opening the file in an editor. In my Notepad ++, they are highlighted in green.

How to leave comments in html?

Very easy. The syntax for a comment in markup language is as follows:

Thus, you can comment out not only one line, but several. The main thing to remember is that- closing. Inside such a construction, you can use both just an explanatory text, and tags in angle brackets, the browser will not read them.

As I said, the comment has the following features:

1. it is not visible on the page
2. and in the source code, too, no, but only when editing a file
3. all tags that are placed in it will not be processed by the browser in any way

What is it for

The main purpose of comments is to help other developers. When coding, you can explicitly indicate which part of the code forms the header, and which part forms the main part. Of course, experienced coders would have figured it out without it, but still reading and understanding the code improves. And also comments help people who do not understand html well, after all, at least a little to understand what has been written. Here's an example of their use:

The second possible use of a comment is to make some piece of code inactive for a while, when you would not want to delete it, but you need to somehow make its execution inactive. By the way, this can help identify various layout errors.

In general, one of the good qualities of any web developer is the ability to write beautifully designed and understandable code. This means that you need to use indentation, showing the nesting of elements, also leave comments if necessary, separate the main parts of the document with line breaks, etc. All this helps those who will edit the code in the future, as well as the author himself, who will not get lost in his own creation.

I'll start this article with what comments are for. Suppose you are developing a module with a complex structure. Or you make a layout with many attachments of elements. In such cases, it is best to mark some parts of the code somehow - for this, there are comments.

Now I will show in detail four types of comments, more precisely, all their types for four different codes.

HTML Comments

To add a comment to HTML markup, use:

Everything that is in these tags is not visible on the screen, but is available for viewing in the source code.

Comments in CSS styles

To add a comment to CSS styles, use:

Everything that is in these tags is not taken into account when forming styles, but is available for viewing in the styles file itself.

JavaScript Comments

For adding comments in JavaScript there are their two types.

First type:

// Text, code or other

Second type:

/ * Text, code or other * /

Everything that is in these tags is not taken into account when the script is executed, but is available for viewing in the JavaScript file itself.

Comments in PHP code

This programming language, unlike the previous ones, has 3 types of comments.

First type:

// Text, code or other

Second type:

/ * Text, code or other * /

And the third type:

# Text, code or other

Everything that is in these tags is not taken into account when executing the script and is visible only in the PHP file itself.

Note!

/ * / * My code * / * /

will give you an error.

In this lesson, I will talk about how comments in HTML, CSS, PHP... Comments are text that is not visible on the web page. They are used for all sorts of explanations, reminders, descriptions for webmasters, which allows you to structure the document. Comments are indispensable when debugging code, they allow you to quickly navigate the markup of a web page and find the block you need. Often, comments are used to debug HTML code. For example, you can temporarily comment out a specific block of code so that it does not run, and if necessary, it can be easily restored.

HTML comments

In HTML, comments are formed using symbols:... Thus, any text between these symbols is a comment. Let's consider an example:

Example HTML Comments

Comments in CSS

CSS comments are created using the symbols: / * and * /. To create a comment, you just need to place the web page code between these symbols:

/ * Beginning of block with styles for Body * / body (background: #efeded; font-family: Verdana, Helvetica, sans-serif; font-size: 12px; margin: 0px; padding: 0px;) / * End of block with styles for Body * /

PHP Comments

PHP comments can be single-line or multi-line:

1) Single line comments in PHP are created using the symbols: //. You just need to put this symbol in front of the line and it will be commented out. This option is used in the case when the comment consists of only one line.

2) To implement multi-line comments, the following symbols are used: / * and * /. This option is useful if the comment spans multiple lines.

Thus, we have learned to do

In the work of a programmer, you constantly have to make some notes in the form of comments, in order to describe a part of the code or marks for the future. Each language has its own syntax, which is why when developing web pages, a common problem is not knowing how to comment out a line in HTML or just a small block at once.

HTML comments

When developing a web page, sometimes it is necessary to hide a part of the code for a while or to make a note for the programmer. In order not to use additional applications, for example, transferring part of the code to another file, you need to know how to comment out a line in HTML.

Unlike most programming languages, HTML does not have a special function or tag for creating a one-line comment. If you need to "hide" only one line or part of it, you have to use the classic language toolkit. However, there are several ways to do this.

Standard comment

In HTML, the easiest way to comment out a piece of code is to use special character pairs. Before starting a comment, you must specify "". Thus, everything inside this construction will be hidden from the user when the page is loaded.

It should be noted that when working with a comment, you must be extremely careful. Determining its boundaries, you need to check whether any opening or closing tag has fallen into it, the second part of which has remained outside of it - in this case, the page load will be incorrect. Also, you cannot create several more inside one comment - with this writing, the first signal to the end of the commenting part will open the entire subsequent part of the hidden text.

Below is an example of correct spelling:

This is a comment.

Tag

In HTML, you can also comment out lines using a special pair of tags - ... It is specifically included in the language syntax for this purpose, but most popular browsers do not support it, with the exception of Internet Explorer 8.0. Tag Useful when some information needs to be hidden only for IE 8.0, 4.0 and earlier, or as a temporary solution during development. The specific point here is that you can comment out a part of the code only in the body of the page, that is, inside the tag .

In the example below, when the page is loaded in the specified browsers, a white sheet will be displayed, in other programs the page will be written:

This is a comment

.

Unconventional approach

In addition to the classical methods, you can comment out the code in HTML using specific methods. In addition to the basic HTML language structures, scripting and style sheet tags are often specified in the body of the page. Each of them also has its own comment definitions.

Thus, if you enclose the necessary part of the code in one of the specified tags, then inside you can use other methods to comment out part of the code on the HTML page. Such methods are practically not used in modern practice, however, for self-development or, if necessary, to exclude the possible appearance of text on the page, they can be applied.

When using a script tag or style sheet, comments can be single-line or multi-line. The former are defined by the "//" construction, which, from the moment of writing these characters, comments the rest of the line. In order to hide a part of the code, you should use the syntax description "/ *" to open, and "* /" to close a comment. If the closing construct is not written after the "/ *" symbols, the entire remaining HTML code will be commented out.

The presented example shows a way of non-standard commenting:

/*

Это комментарий.

*/