面對驗證是當我選擇單選按鈕時

Question

主要問題是當我選擇現金單選按鈕時，第一個字段必須為必填項;如果我選擇第二個按鈕，則檢查字段必須為必填項...
當我提交數據驗證不起作用時，為此程序添加HTML代碼

<form action="add_file.php" method="post" enctype="multipart/form-data" name="form4">
              <table width="400" align="center" cellspacing="10" >

      <tr>
        <td></td>

      </tr>
      <tr>
        <td style="width:200px;"><label class="label">Purchase Date:</label></td>
        <td><input type="text" name="Purchase_date" id="datepicker" class="button" /></td>
      </tr>

      <tr>
        <td style="width:200px;"><label class="label">Expanse Head:</label></td>
        <td><input type="text" name="Expanse_head" class="button" /></td>
      </tr>

      <tr>
        <td style="width::200px"><label class="label">Type of Payment:</label></td>
          <td><input type="radio" name="type" value="cash" />
            cash
            <input type="radio" name="type" value="cheque"/><label>
              cheque</label></td>

        </tr>

      <tr>
        <td style="width:200px;"><label class="label">Expanse Cash:</label></td>
        <td><input type="text" name="Expanse_cash" class="button" pattern="[0-9]+" required title="Please Enter Digits"/></td>
      </tr>

       <tr>
        <td style="width:200px;"><label class="label">Cheque No</label></td>
        <td><input type="text" name="cno" class="button" /></td>
      </tr>






        <tr style="margin-top:100px;">
        <td><label class="label">Bill</label></td>
        <td><input type="file" name="uploaded_file"  /></td>

      </tr>
       <tr style="margin-top:100px;">
        <td></td>
        <td><input type="submit" value="Save" onclick="return validate(this);" /></td>

      </tr>
      <tr>
      <td></td>

      </tr>


    </table>


          </form>



    <script>
    function validate(){
    if(document.form4.Purchase_date.value==""){alert("Please Enter Date");  return false;}
    if(document.form4.Expanse_head.value==""){alert("Please Enter Expanse Head");   return false;}

    /*if(document.form4.type.value=="1"){
        (document.form4.Expanse_cash.value=="")
            {alert("Please Enter value");   return false;}}
        else(document.form4.type.value=="cheque")
        {
            (document.form4.cno=="");
            {alert ("Please Enter Cheque No "); return false;}}*/

    if(document.form4.uploaded_file.value==""){alert("Please upload file"); return false;}

        }
    </script>

Answer 1

重寫代碼，希望它能工作！

if（document.form4.type.value ==“ Cash ”）{

如果 （document.form4.Expanse_cash.value ==“”）{

alert("Please Enter value");
return false;

}

}

否則，如果 （document.form4.type.value ==“ cheque”）{

如果 （document.form4.cno。 值 == “”）{

alert ("Please Enter Cheque No "); 
return false;}

}

其他{

alert（“請選擇一種付款方式！”）;

}