PHP提交選擇

Question

我想沒有提交按鈕，當用戶選擇一個值時，有任何表單可以提交的方式嗎？

<form method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>" > 

    <table class="form"> 

      <select name="category" class="formfield" id="category"> 
       <option value="-1"> Category </option> 
       <?php 
        $sql_contry = "SELECT * FROM category"; 
        $rs_c = mysql_query($sql_contry); 
        while ($row_c = mysql_fetch_array($rs_c)) { 
         echo '<option value="'.$row_c['category'].'">'.$row_c['category'].'</option>'; 
        } 
       ?> 
      </select> 

    </table> 

</form> 

Answer 1

是 - 使用JavaScript：

HTML：

<form id="frm"> 
    <select onchange="onSelectChange();"> 
      <option>1</option> 
      <option>1</option> 
    <select> 
</form> 

JS：

function onSelectChange(){ 
document.getElementById('frm').submit(); 
} 

Answer 2

下面的例子

<form> 
    <select name='myfield' onchange='this.form.submit()'> 
     <option selected>Milk</option> 
     <option>Coffee</option> 
     <option>Tea</option> 
    </select> 
    <noscript><input type="submit" value="Submit"></noscript> 
</form> 

使用noscript標記可以使尚未啓用JavaScript的瀏覽器仍能正常工作。如下

Answer 3

只是改變代碼，我還沒有檢查代碼，所以可能會有一些錯誤，如資本/小寫字母我不知道像，它的提交（）或提交（）等..

<script language="javascript"> 
function submitForm(){ 
    var val = document.myform.category.value; 
    if(val!=-1){ 
     document.myform.submit(); 
    } 
} 
</script> 
<form method="post" name="myform" action="<?php echo $_SERVER['PHP_SELF'] ?>" > 

    <table class="form"> 

      <select name="category" class="formfield" id="category" onchange="submitForm();"> 
       <option value="-1"> Category </option> 
       <?php 
        $sql_contry = "SELECT * FROM category"; 
        $rs_c = mysql_query($sql_contry); 
        while ($row_c = mysql_fetch_array($rs_c)) { 
         echo '<option value="'.$row_c['category'].'">'.$row_c['category'].'</option>'; 
        } 
       ?> 
      </select> 

    </table> 

</form>