Question

我有两个形式领域,只想在这两个领域都具有价值时,才采用分类法。我已尝试过这一点,但必须要有更好的办法。我认为,这种做法可能导致错误。

$( #RFID ).change(function(e){          

    if($(this).val() !=    && $( #STATION_ID ).val() !=   ){                

    }
});

Answer 1

这不是一种特别坏的做法。但可以清理。我愿谈谈这样的情况:

var $fields = $( #RFID, #STATION_ID ).change(function(e) {
    if ($fields[0].val() && $fields[1].val()) {
        // post it
    }
});

Edit: The code above was assuming you wanted to post as soon as you had both values. Looking at your question again, I may have read it wrong. If you simply want to prevent the form from posting unless you have both values, you would really want this:

$( form ).submit(function(e) {
    if (!$fields[0].val() || !$fields[1].val()) e.preventDefault();
});

Answer 2

You can simply make the same check before making the post:

if ($.trim($( #RFID ).val()) !=    && $.trim($( #STATION_ID ).val()) !=   ) {
    // do post
}

Answer 3

Probably would assign an on change handler across all fields that could generate an auto submit of the form.

也许会针对每个领域增加一个可以参加汽车提交的会议。

Little more code I know but sets the intent and collects the validation all in one place.

Hope it helps.

$( .auto-submit ).change(function(e) {
  // collect all the auto submit fields and make sure they are not empty
  for( field in $( .auto-submit ) )
     if( field.val() ==    ) return;   // all fields not there
  }
  // do form submit here
} );

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