Html link with if statement

jQuery External links with else if statement

The following tutorial shows you how to do «jQuery External links with else if statement».

The result is illustrated in the iframe.

You can check the full source code and open it in another tab using the links.

Javascript Source Code

The Javascript source code to do «jQuery External links with else if statement» is

$('a[href*="://"],a[href^="mailto:"]').addClass("external");

html> head> meta name="viewport" content="width=device-width, initial-scale=1"> script type="text/javascript" src="https://code.jquery.com/jquery-1.11.0.js" > style id="compiled-css" type="text/css"> .external!-- ww w . d e m o2 s .c o m--> color: red; >  body> br/> a href="#what">hash br/> a href="afs://what">afs br/> a href="cid://what">cid br/> a href="file://what">file br/> a href="ftp://what">ftp br/> a href="http://what">http br/> a href="https://what">https br/> a href="mailto:what">mailto br/> a href="mid://what">mid br/> a href="news://what">news br/> a href="x-exec://what">x-exec br/> a href="what.html">internal link  br/> a href="what/index.html">internal subdir link  br/> a href="../what/index.html">internal updir link  br/> a href="./what/index.html">internal samedir link  script type='text/javascript'> $('a[href*="://"],a[href^="mailto:"]').addClass("external");   

Related

• jQuery erratic behavior of cloned links (Demo 2)
• jQuery erratic behavior of cloned links (Demo 3)
• jQuery expander plugin custom «read-more» link
• jQuery External links with else if statement
• jQuery External links with else if statement (Demo 2)
• jQuery External links with else if statement (Demo 3)
• jQuery find links that have no target or a certain target

demo2s.com | Email: | Demo Source and Support. All rights reserved.

Источник

[HTML] — How to make an HTML button go to link with if statement

Learn how to use JavaScript to make a button in HTML go to a link if the condition is true. Learn more from MDN Web Docs.

👩‍💻 Technical question

How do I make a button on html go to a link if the if statement is true

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Источник

PHP if

Summary: in this tutorial, you’ll learn about the PHP if statement and how to use it to execute a code block conditionally.

Introduction to the PHP if statement

The if statement allows you to execute a statement if an expression evaluates to true . The following shows the syntax of the if statement:

 if ( expression ) statement;Code language: HTML, XML (xml)

In this syntax, PHP evaluates the expression first. If the expression evaluates to true , PHP executes the statement . In case the expression evaluates to false , PHP ignores the statement .

The following flowchart illustrates how the if statement works:

The following example uses the if statement to display a message if the $is_admin variable sets to true :

 $is_admin = true; if ($is_admin) echo 'Welcome, admin!';Code language: HTML, XML (xml)

Since $is_admin is true , the script outputs the following message:

Curly braces

If you want to execute multiple statements in the if block, you can use curly braces to group multiple statements like this:

 if ( expression ) < statement1; statement2; // more statement >Code language: HTML, XML (xml)

The following example uses the if statement that executes multiple statements:

 $can_edit = false; $is_admin = true; if ( $is_admin ) < echo 'Welcome, admin!'; $can_edit = true; >Code language: HTML, XML (xml)

In this example, the if statement displays a message and sets the $can_edit variable to true if the $is_admin variable is true .

It’s a good practice to always use curly braces with the if statement even though it has a single statement to execute like this:

 if ( expression ) Code language: HTML, XML (xml)

In addition, you can use spaces between the expression and curly braces to make the code more readable.

Nesting if statements

It’s possible to nest an if statement inside another if statement as follows:

 if ( expression1 ) < // do something if( expression2 ) < // do other things > >Code language: HTML, XML (xml)

The following example shows how to nest an if statement in another if statement:

 $is_admin = true; $can_approve = true; if ($is_admin) < echo 'Welcome, admin!'; if ($can_approve) < echo 'Please approve the pending items'; > >Code language: HTML, XML (xml)

Embed if statement in HTML

To embed an if statement in an HTML document, you can use the above syntax. However, PHP provides a better syntax that allows you to mix the if statement with HTML nicely:

 if ( expession) : ?>  endif; ?>Code language: HTML, XML (xml)

The following example uses the if statement that shows the edit link if the $is_admin is true :

html> html lang="en"> head> meta charset="UTF-8"> title>PHP if Statement Demo title> head> body>  $is_admin = true; ?>  if ( $is_admin ) : ?> a href="#">Edit a>  endif; ?> a href="#">View a> body> html>Code language: HTML, XML (xml)

Since the $is_admin is true , the script shows the Edit link. If you change the value of the $is_admin to false , you won’t see the Edit link in the output.

A common mistake with the PHP if statement

A common mistake that you may have is to use the wrong operator in the if statement. For example:

 $checked = 'on'; if( $checked = 'off' ) < echo 'The checkbox has not been checked'; >Code language: HTML, XML (xml)

This script shows a message if the $checke d is ‘off’ . However, the expression in the if statement is an assignment, not a comparison:

$checked = 'off'Code language: PHP (php)

This expression assigns the literal string ‘off’ to the $checked variable and returns that variable. It doesn’t compare the value of the $checked variable with the ‘off’ value. Therefore, the expression always evaluates to true , which is not correct.

To avoid this error, you can place the value first before the comparison operator and the variable after the comparison operator like this:

 $checked = 'on'; if('off' == $checked ) < echo 'The checkbox has not been checked'; >Code language: HTML, XML (xml)

If you accidentally use the assignment operator (=), PHP will raise a syntax error instead:

 $checked = 'on'; if ('off' = $checked) < echo 'The checkbox has not been checked'; >Code language: HTML, XML (xml)

Parse error: syntax error, unexpected '=' . Code language: JavaScript (javascript)

Summary

• The if statement executes a statement if a condition evaluates to true .
• Always use curly braces even if you have a single statement to execute in the if statement. It makes the code more obvious.
• Do use the pattern if ( value == $variable_name ) <> to avoid possible mistakes.

Источник

HTML Link + if-else statements

posted 11 years ago

I have created the following webpage which I want to link to another webpage depending on the user’s selected option.

My Webpage:

Problem Faced:
No matter what the user selects, the webpage always link to http://localhost:8080/Math/page2.html of the else statement.
How can I modify the code to have the if statement works correctly?

All help will be greatly appreciated.

posted 11 years ago

Hm,
is the code you posted from page2.html?
Maybe you just submit the form and because no action attribute is specified you land on the same page.
You can test that if you add an alert(‘page loaded’) as the first statement in the script block (but outside of the function).
If it it pops up after you click the «Go» button you know.
Another thing:
better use selectedIndex to compare becaue string values are prone to typos

Источник