在下拉列表中的javascript值沒有更新

Question

在下面的代碼中，首先我已經使用javascript代碼的下拉列表，當我更新只有第一行得到更新，剩下的不更新。並在接下來的我使用的HTML代碼，它得到所有行更新任何人都可以幫助解決這個問題。我從html更改爲js的原因是汽車年。

<script type="text/javascript"> 
function autoYear() { 
    var time = new Date(); 
    var year = time.getYear(); 

    if (year < 1900) { 
    year = year + 1900; 
    } 

var date = year - 1; /*change the '25' to the number of years in the past you want to show */ 
var future = year + 10; /*change the '10' to the number of years in the future you want to show */ 

document.writeln ("<form><select id='year_<?php echo $row->id ?>' name='year_<?php echo $row->id ?>' ><option value=\"\"><?php echo $row->year; ?>"); 

do { 
    date++; 
    if (date != <?php echo $row->year; ?>) { 
     document.write ("<option value=\"" +date+"\">" +date+ ""); 
    } 
} 
while (date < future); 
    document.write ("</select></form>"); 
} 
</script> 
<script type="text/javascript"> 
    autoYear(); 
</script> 

的Html

<select class="inputmedium" name="year_<?php echo $row->id; ?>" id="year_<?php echo $row->id; ?>" value="<?php echo $row->year; ?>"> 
      <?php for($s=0;$s<8;$s++) 
       { 

       if($row->year!=null and $row->year==$year_array[$s]){ 

        echo "<option selected value='" .$year_array[$s]. "'>" .$year_array[$s]. "</option>"; 

        }else{ 

        echo "<option value='" .$year_array[$s]. "'>" .$year_array[$s]. "</option>"; 


        } 
       } ?> 

       </select> 

<?php 
$year_array=array(); 
$year_array[0]="2013"; 
$year_array[1]="2014"; 
$year_array[2]="2015"; 
$year_array[3]="2016"; 
$year_array[4]="2017"; 
$year_array[5]="2018"; 
$year_array[6]="2019"; 
$year_array[7]="2020"; 


?> 

Answer 1

首先，你的代碼修改此行，並檢查

document.writeln ("<form><select id='year_<?php echo $row->id ?>' name='year_<?php echo $row->id ?>' ><option value=\"\"><?php echo $row->year; ?>"); 

要

document.writeln ("<form><select id='year_<?php echo $row->id ?>' name='year_<?php echo $row->id ?>' ><option value=\"\"><?php echo $row->year; ?></option>"); 

而且

document.write ("<option value=\"" +date+"\">" +date+ ""); 

要

document.write ("<option value=\"" +date+"\">" +date+ "</option>");