Question

我有一个包含select标签的表单，我想在点击上一页的按钮后预填充该标签。我怎样才能做到这一点？这是表单代码：

<form method="post" name="registration" action="http://esafe.urdemo.net/user/login/signup" onsubmit="return checkform2();">

                                <input type="text" class="textbox"  placeholder="Enter First Name"   name="first_name" /> 

                               <input type="text" class="textbox"   placeholder="Enter Middle Name" name="middle_name" />

                               <input type="text" class="textbox"  placeholder="Enter Last Name" name="last_name" />

                               <input type="text" class="textbox"  placeholder="Select Date dd/mm/yyyy"  name="Date1" onblur="return checkdob(this);"/>

                               <input type="text" class="textbox"  placeholder="Enter Email Id" name="email" />

                               <input type="text" class="textbox"  placeholder="Enter Mobile No." name="mobile" />

                               <select name="plan" class="form-control"  style="width:90%">
                                    <option value="" selected="selected">Please Select</option>
                                    <option value="1">Pro</option>
                                    <option value="2">Premium</option>
                                    <option value="3">Elite</option>
                                    <option value="4">Magna</option>
                               </select>
 <div class="signinStrip">
  <span class="forgot"> <a href="#" id="resend_password_link"></a> </span>
   <input class="signin_submit" value="Submit" type="submit" />
    </div>
    </form>

这里是按钮的代码

 <tr>
     <td class="title">&nbsp;</td>
     <td><p class="bottom"><a class="btn btn-primary" href="#" >Buy Now</a></p></td>
     <td><p class="bottom"><a class="btn btn-primary" href="#" >Buy Now</a></p></td>
     <td><p class="bottom"><a class="btn btn-primary" href="#" >Buy Now</a></p></td>
     <td><p class="bottom"><a class="btn btn-primary" href="#" >Buy Now</a></p></td>

    </tr>

Answer 1

如果要根据上一页点击的按钮选择特定选项，则必须通过某个服务器端变量或通过地址URL参数发送该值。例如。你的第二页网址必须是“http://yourdomain.com/page2?selected_value=temp”

然后在下一页javascript中你必须提取这个参数

function getParam(paramName) {
  return decodeURI(
    (RegExp(paramName + '=' + '(.+?)(&|$)').exec(location.search)||[,null])[1]
  );
} 
var selectedVal = getParam("elected_value");
document.getElementById(<your select box id>).value = selectedVal;

如何使用javascript预先选择选择标签选项

1 个答案: