Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

Building with the principles of progressive enhancement, the first thing to do is to write it so it works without JavaScript.

There are two approaches you could take. Both will start with a select element containing the list of cities. Then you either…

  1. Have a simple text input in which the user can enter the data free form.
  2. Have a submit button and let the user go to a new page which gives them the next set of choices.

Then you can enhance with JavaScript.

If you went with the free form text input, remove it using JS.

Generate something to indicate that more options will be available once the first select has items picked. A disabled select element for instance.

When the first select has an item picked, populate the second one and stop it being disabled. You will need to get the data from somewhere. This could be included in the page at load time, or requested from the server (using an Ajax technique) on demand. The first option will be more responsible, but will have a heavier inital load. The decision should be based on the size of your database.

Getting the data into a form that is friendly to JavaScript is a good job for JSON::Any.

I'll leave out the specifics of writing the JavaScript to deal with that data, this is PerlMonks, after all.


In reply to Re: Dynamic Drop down in CGI by dorward
in thread Dynamic Drop down in CGI by d0353101

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others scrutinizing the Monastery: (3)
As of 2022-12-03 02:16 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Notices?