在onclick上按类获取此值

Question

我有一个表格和jquery，用于按类

获取值this

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function sendModel(el){
var id_model = $(el).class('id_model');
  alert(id_model);
}

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<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
  <input name='id_model' class='id_model' value='M001'>
  
  <button onclick='sendModel(this)'> send </button>
  
  </form>

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如何用id_model值显示警告？谢谢你们

Answer 1

提交表格

$('#myForm').submit(function(e){
  e.preventDefault();
  var id_model = $('.id_model').val();
  alert(id_model);
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="myForm">
  <input name='id_model' class='id_model' value='M001'>
  
  <button type="submit"> send </button>
  
  </form>

你的方式

function sendModel(){
  var id_model = $('.id_model').val();
  alert(id_model);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
  <input name='id_model' class='id_model' value='M001'>
  
  <button onclick='sendModel()'> send </button>
  
  </form>

Answer 2

你可以尝试一下吗？

var id_model = $('.id_model');

alert(id_model.attr('value'))