jquery提交函数（）不起作用

Question

我正在尝试以最简单的方式验证我的表单，但不知何故不起作用，当我单击提交按钮时，它只是重新加载页面而不在IsRequired类上给出错误消息。

我究竟做错了什么？

HTML5

<form method="post">
  <div>
    <div class="field-wrap"><label>First Name</label></div>
    <input class="thevalue" type="text" minlength="3" style="text-transform:uppercase">
    <div class="IsRequired" style="display:none">Fill first name</div>
  </div>
  <div>
    <div class="field-wrap"><label>Second Name</label></div>
    <input class="thevalue" type="text" minlength="3" style="text-transform:uppercase">
    <div class="IsRequired" style="display:none">Fill second name</div>
  </div>
  <div>
    <div class="field-wrap"><label>email</label></div>
    <input class="thevalue" type="text" style="text-transform:lowercase">
    <div class="IsRequired" style="display:none">Fill email</div>
  </div>
  <div>
    <div class="field-wrap"><label>Country</label></div>
    <select name="Country" class="thevalue cs-select" style="display: none;">

    </select>
    <div class="IsRequired" style="display:none">Select country</div>
  </div>
  <div>
    <input name="Submit" type="submit" value="Submit">
  </div>
</form>

JavaScript的

$(document).ready(function() {
  $("form").submit(function(event) {
    var bool = false;
    var el = document.getElementsByClassName("thevalue");
    var el_ = document.getElementsByClassName("IsRequired");

    for(var i = 0; i < el.length; i++) {
      if(el[i].value == "" || el[i].value == null) {
        el_[i].style.display = 'block'; // show message error
        bool = true;
      } else if(el[i].value != "" || el[i].value != null) {
        el_[i].style.display = 'none';
      }
    }

    if(bool == true) {
      //no submit without reload
    } else if(bool == false) {
      //submit 
    }

    event.preventDefault();

  })
})

Answer 1

解决了

我在@Rupal指定的每个输入字段上放置了必需项，并在@kevinniel的开头放置了e.preventDefault（）。

所以，我已将我的代码更改为：

$('form').submit(function(e) {
  e.preventDefault();
  $('input[required]').each(function() {
    if($(this).val() == '') {
      $('span.form_error').text('A required field was not filled out');
    }
  });
})