javascript - 当所选选项禁用时禁用按钮提交

Question

我正在使用 jquery，我想首先禁用我的按钮以防止它提交空值。

这是我的代码

<form method = "get" action = "" >
        <div id="select-vehicle">
         <select class = "form-control">
            <option  selected disabled  > Select Vehicles</option>

        </select>

        </div>
        <button type = "submit" value = "submit" id= "submit">TEST</button>
        </form>

这是我现在的 jquery

var workers = ["car1", "car2", "car3"];
        for(var i=0; i< workers.length;i++)
    {
    //creates option tag
      jQuery('<option/>', {
            value: workers[i],
            html: workers[i]
            }).appendTo('#select-vehicle select'); //appends to select if parent div has id dropdown
    }
  $('button').click(function(event) {
    var value = $( "select" ).val();
    $('form').attr('action', 'accessories/vehicles/' + value +'/');
  });

谢谢!

Answer 1

这是 jQuery 代码

$(document).ready(function(){
var workers = ["car1", "car2", "car3"];
        for(var i=0; i< workers.length;i++)
    {
    //creates option tag
      jQuery('<option/>', {
            value: workers[i],
            html: workers[i]
            }).appendTo('#select-vehicle select'); //appends to select if parent div has id dropdown
    }
    
    jQuery('#select-vehicle select').on('change', function(){
    	if(jQuery(this).val() == ''){
        	jQuery('#submit').attr('disabled',true);
        }else{
        	jQuery('#submit').removeAttr('disabled');
        }
    });
    
    if( !jQuery('#select-vehicle select').val() ){
    	jQuery('#submit').attr('disabled',true);
    }else{
    	jQuery('#submit').removeAttr('disabled');
    }
  $('button').click(function(event) {
    var value = $( "select" ).val();
    $('form').attr('action', 'accessories/vehicles/' + value +'/');
  });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<form method = "get" action = "" >
        <div id="select-vehicle">
         <select class = "form-control">
            <option  selected disabled  > Select Vehicles</option>

        </select>

        </div>
        <button type = "submit" value = "submit" id= "submit">TEST</button>
        </form>

如果任何选项没有值，它还会禁用提交按钮。