jQuery: how to find first visible input/select/tex

问题:

I tried

$(":input:not(input[type=button],input[type=submit],button):visible:first")

but it doesn't find anything.

What is my mistake?

UPD: I execute this on $(document).load()

<script type="text/javascript">
$(window).load(function () {
  var aspForm  = $("form#aspnetForm");
  var firstInput = $(":input:not(input[type=button],input[type=submit],button):visible:first", aspForm);
  firstInput.focus();
});
</script>

and in the debug I can see that firstInput is empty.

UPD2: I'm in ASP.NET page running under Sharepoint.

I've found so far that for some elements it does find them (for fixed ones) and for some don't. :(

回答1:

Why not just target the ones you want (demo)?

$('form').find('input[type=text],textarea,select').filter(':visible:first');

Edit

Or use jQuery :input selector to filter form descendants.

$('form').find('*').filter(':input:visible:first');

回答2:

The JQuery code is fine. You must execute in the ready handler not in the window load event.

<script type="text/javascript">
$(function(){
  var aspForm  = $("form#aspnetForm");
  var firstInput = $(":input:not(input[type=button],input[type=submit],button):visible:first", aspForm);
  firstInput.focus();
});
</script>

Update

I tried with the example of Karim79(thanks for the example) and it works fine: http://jsfiddle.net/2sMfU/

回答3:

This is my summary of the above and works perfectly for me. Thanks for the info!

<script language='javascript' type='text/javascript'>
    $(document).ready(function () {
        var firstInput = $('form').find('input[type=text],input[type=password],input[type=radio],input[type=checkbox],textarea,select').filter(':visible:first');
        if (firstInput != null) {
            firstInput.focus();
        }
    });
</script>

回答4:

This is an improvement over @Mottie's answer because as of jQuery 1.5.2 :text selects input elements that have no specified type attribute (in which case type="text" is implied):

$('form').find(':text,textarea,select').filter(':visible:first')

回答5:

Here is my solution. The code should be easy enough to follow but here is the idea:

• get all inputs, selects, and textareas
• filter out all buttons and hidden fields
• filter to only enabled, visible fields
• select the first one
• focus the selected field

The code:

function focusFirst(parent) {
    $(parent).find('input, textarea, select')
        .not('input[type=hidden],input[type=button],input[type=submit],input[type=reset],input[type=image],button')
        .filter(':enabled:visible:first')
        .focus();
}

Then simply call focusFirst with your parent element or selector.

Selector:

focusFirst('form#aspnetForm');

Element:

var el = $('form#aspnetForm');
focusFirst(el);

回答6:

You may try below code...

$(document).ready(function(){
    $('form').find('input[type=text],textarea,select').filter(':visible:first').focus();
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<form>
<input type="text" />
<input type="text" />
<input type="text" />
<input type="text" />
<input type="text" />
    
<input type="submit" />
</form>