Find next closest focusable element using jquery? [closed]

I want my text boxes have the feature that every time users press enter, it will focus to next closest element whatsoever they are(input, checkbox, button, radio, select, a, div) as long as they can be focused. How can I do that using jquery?

Answers:

Answer

I've already done that before. Try my solution here http://jsfiddle.net/R8PhF/3/

$(document).ready(function(){
    $('#mytextbox').keyup(function(e){
        var code = (e.keyCode ? e.keyCode : e.which);
        if(code == 13) {
            var tabables = $("*[tabindex != '-1']:visible");
            var index = tabables.index(this);
            tabables.eq(index + 1).focus();
        }        
    });
});?
Answer

By the way, this is a legitimate technical question and could very well be a business requirement. I have been asked to build such behavior into back office apps quite offten. There are many native apps that behave this way.

I addressed this requirement by building my form using DIVs with contenteditable=true like the example below.

<html>
<head>
  <style type="text/css">

    div.input { border:1px solid #aaa; width:300px; }

  </style>

</head>
<body>

    <div contenteditable="true" class="input"><strong>explore the world,</strong> e.g. paris, france</div>

</body>
</html>

You can the capture the key event for ENTER and simply set focus on the next sibling using JQuery.

Let me know if you need further clarification.

Hope this helps. Good Luck.

Answer

Algorithm-wise:

  1. Keep a list of all elements that can be focussed. Do not rely on the DOM for this. You must keep the list yourself. If you don't know which elements are on the page you've already done something wrong. The DOM is a view not a datastore, treat it accordingly. Many novices who use jQuery make this mistake, and with jQuery this mistake is easy to make.

  2. Find the position of all focussable elements on the page. In accordance with 1. the best way is of course to know the relative position of all elements even without looking at the DOM. With jQuery you can use .dimension(). You may have to do some bookkeeping to keep this list up to date (ie. when your data/view changes).

  3. Find the position of the current focussed element.

  4. Use some algorithm to compare it to your list of other positions and get the closest (this can mean a lot of things, you probably know what you want).

  5. Then set the focus to the element.

There are many choices you can make here, some depend on performance others depend on interaction and interface design.

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