将查询字符串追加到URL

Question

"Appending an url with appendages that were already in the previous url?" That's the most confusing title -- I know. But I can't think of a better way to explain it.

Maybe the below example will help.

I have URL 1: http://example.com/?value=xyz&stuff=abc

If someone clicks on a link within the page, can I pass along the appended values?

ie: http://www.example.org/?value=xyz&stuff=abc

Thanks and sorry for being such a noob.

Answer 1

These appendages you ask about is the actual so called query part of an URI:

<scheme>://<authority><path>?<query>

  foo://example.com:8042/over/there?name=ferret#nose
  \_/   \______________/\_________/ \_________/ \__/
   |           |            |            |        |
scheme     authority       path        query   fragment

Taken from: 3. Syntax Components (RFC 3986) http://tools.ietf.org/html/rfc3986#page-16

You then need a helper function that is append the (optional) <query> to an existing <scheme>://<authority><path> part. I ignore the <fragment> for this exmaple, as it would needed to be added at the end and I want to leave something as an exercise:

function href_append_query($href)
{
    $query = isset($_SERVER['QUERY_STRING'])
        ? '?' . $_SERVER['QUERY_STRING']
        : ''
    ;

    $query = strtr(
        $query, [
            '"' => '"',
            "'" => ''',
            '&' => '&'
        ]
    );

    return $href . $query;
}

And it's usage:

<a href="<?=href_append_query('http://step2.com/')?>Some link</a>

This little function will ensure that the exisitng QUERY_STRING which can be obtained via $_SERVER ^Docs is encoded for HTML output.

Answer 2

If links are built with PHP, just append the original query string to them:

<a href="http://step2.com/?<?php echo $_SERVER['QUERY_STRING']; ?>">Some link</a>

In JavaScript, just append the value of window.location.search to all the links you need to 'pass' the query string.

Answer 3

You could also use js/jquery to append the existing query string to each link on the page:

 $(function() {
    $('a').each(function() {
      link = $(this).attr('href');
      query = window.location.search;
      if (link.indexOf('?') !== -1 && query !== '') {
        query = query.replace('?','&');
      }
      $(this).attr('href',link+query);
    });
  });