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JavaScript jQuery Basics Working with jQuery Collections Stopping the Browser's Default Behavior

Holly Groves
Holly Groves
10,175 Points
Posted by Holly Groves
Holly Groves
10,175 Points

$pdfCheckbox

I'm not sure why the pdfCheckbox is not showing up in the browser for me. I'm using Firefox. Here's my code:

const $odd = $('a:odd'); const $secureLinks = $('a[href^="https://"]'); const $pdfs = $('a[href$=".pdf"]'); const $pdfCheckbox = $('<label><input type='checkbox'> Allow PDF downloads</label>');

$secureLinks.attr('target', '_blank'); $pdfs.attr('download', true);

$secureLinks.addClass('secure'); $pdfs.addClass('pdf');

$pdfs.on('click', function(event){ //check if checkbox has been checked //if zero checkboxes are checked if ($(':checked').length === 0) { //prevent download of document event.preventDefault(); //alert the user alert('Please check the box to allow PDF downloads.'); }

});

$('#links').append($pdfCheckbox);

<!DOCTYPE html> <html> <head> <title>jQuery Weekly</title> <link rel="stylesheet" href="css/style.css" type="text/css" media="screen" title="no title" charset="utf-8"> </head> <body> <div class="box"> <h1>jQuery Weekly</h1> <div id="links"> <ul> <li><a href='https://learn.jquery.com/'>Learn jQuery</a></li> <li><a href='http://treehouse-project-downloads.s3.amazonaws.com/jquery-basics/jquery_cheatsheet.pdf' download>jQuery Cheatsheet</a></li> <li><a href='https://api.jquery.com/'>jQuery Documentation</a></li> <li><a href='https://developer.mozilla.org/en-US/docs/Glossary/jQuery'>jQuery Glossary</a></li> </ul> </div> </div> <script src="js/jquery-3.2.1.min.js"></script> <script src="js/app.js"></script> </body> </html>

1 Answer

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

You have a syntax error caused by using the same type of quote to make a string that includes that type of quote.

There's two easy fixes:

// you can use a different type of quote character to enclose the string:
const $pdfCheckbox = $("<label><input type='checkbox'> Allow PDF downloads</label>");
// or you can "escape" the characters that would otherwise end the string:
const $pdfCheckbox = $('<label><input type=\'checkbox\'> Allow PDF downloads</label>');

When posting code in future, be sure to use Markdown formatting to preserve the code's appearance.