如何將輸入標籤中的必需項更改爲false

Question

我有此HTML代碼並希望按下後退按鈕而不需要輸入數據，因此可以將其重定向回到上一頁，需要在vb.net中。

<form runat="server"> 
    <table> 
     <tr><td>First Name:</td><td><input type="text" id="first" runat="server" Required/></td> 
     <td>Surname:</td><td><input type="text" id="last" runat="server" Required/></td></tr> 
     <tr><td>Date of Birth:</td><td><input type="date" id="birth" runat="server" Required/></td> 
     <td>Gender:</td><td><select id="gender" runat="server" Required><option>Male</option><option>Female</option></select></td></tr> 
     <tr><td>Known Illnesses:</td><td><input type="text" id="illnesses" runat="server" Required/></td> 
     <td>Nationality:</td><td><input type="text" id="country" runat="server" Required/></td></tr> 
     <tr><td>Email:</td><td><input type="email" id="mail" runat="server" Required/></td> 
     <td>Mobile:</td><td><input type="number" id="phone" runat="server" Required/></td></tr> 
     <tr><td>Employer:</td><td><input type="text" id="company" runat="server" Required/></td> 
     <td>Emergency Contact Name:</td><td><input type="text" id="emergencyperson" runat="server" Required/></td></tr> 
     <tr><td>Emergency Contact Number:</td><td><input type="number" id="emergencyphone" runat="server" Required/></td> 
     <td><input type="submit" id="btnUpdate" value="Update" runat="server" /></td> 
     <td><input type="submit" id="btnBack" value="Back" runat="server" /></td></tr> 
     </table> 
     <p id="parMsg" runat="server"></p> 
    </form> 

Answer 1

您必須刪除required屬性。如果存在，則<input>需要數據。