Prevent certain elements from receiving focus

问题

So I have the following function. What it does is listens for the focus event on all elements. If that element is either in $mobileMenu or $menuItems it permits it otherwise it removes the focus:

var $body = $("body");
var $mobileMenu = $("#mobile-menu");
var $menuItems = $("#main-menu a");

$body.on("focus.spf", "*", function(e){
  e.stopPropagation();
  $this = $(this);

  // Prevent items from recieving focus and switching view
  if (!$this.is($mobileMenu) && !$this.is($menuItems)) {
    $this.blur();
  } else {
    console.log(this);
  }
})

The issue I have is that this prevents the user from focusing on anything whatsoever if a normally focusable element that is now non-focusable precedes any of my white-listed elements as it just attempts to refocus on the same element over and over again.

Does anyone know how I can tell it to instead skip to the next focusable element?

回答1:

This works (updated) :

$body.on("focus.spt", "*", function(e){
  $this = $(this);
  if (!$this.is($mobileMenu) && !$this.is($menuItems)) {
    $this.blur();
    var next=$this.nextAll().find('a,input');
    if (next.length>0) next[0].focus();
  } else {
    console.log('ok',this);
    e.stopPropagation();
  }
})

(updated) fiddle -> http://jsfiddle.net/CADjc/ You can see in the console which elements that receives focus (main-menu a and mobile-menu)

Tested on :

<input type="text" tabindex="1" value="test">
<span><input type="text" tabindex="2" value="test"></span>
<div><input type="text" id="mobile-menu" tabindex="3" value="mobile-menu"></div>
<div><span>
    <div id="main-menu">
        <a tabindex="4">main-menu</a>
        <a tabindex="5">main-menu</a>
    </div>
</span></div>
<span>
<input type="text" tabindex="6" value="test">
</span>

回答2:

If you set the tabindex to "-1" on the element, it will ignore the tab. Not sure if this works in all browsers but it works in Google Chrome.

<input type="text" tabindex="-1"/>

回答3:

attr("readonly","readonly"), prevent input focus and value ARE send to the server.

回答4:

If you make something disabled, it won't receive focus. For example:

<input type="text" disabled="disabled" />

Do add it programmatically, you could do:

var el = document.getElementById('disableme');
el.setAttribute('disabled', 'disabled');

来源：https://stackoverflow.com/questions/20962020/prevent-certain-elements-from-receiving-focus

标签

javascript

jquery

html

accessibility