php - PHP 提交时选择

Question

我试图没有提交按钮，当用户选择一个值时，表单是否可以提交？

<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

这里有一个例子

<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 标签，它允许不支持 JavaScript 的浏览器仍然可以运行。

Answer 2

是的 - 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 3

<form action="product.php" method="POST">
<select onchange="this.form.submit();" name="prod">
    <option value="">Select product</option>
    <option value="1">abc</option>
    <option value="2">def</option>
    <option value="3">ghi</option>
    <option value="4">jkl</option>
    <option value="5">mno</option>
</select>

Answer 4

只需更改代码如下，我没有检查代码，所以可能会有一些错误，比如我不确定的大写/小写字母，它是 submit() 或 Submit() 等等..

<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>