Question

此代码以某种方式仅存储上一个文本框的值。当我们生成3个文本框时，只有第3个值存储在数据库中而不是全部。我想将所有生成的文本框值存储在数据库中

 <?php if(isset($_POST['submit'])){
$num_cat = $_POST['num_cat'];
$text = $_POST['category'];
foreach ($text as $key) {
  // echo $key."\n";
}
$insertquery = mysqli_query($con, "INSERT INTO accounts (accountusername, accountemail) VALUES('".$num_cat."', '".$key."')");
if(!$insertquery){
  echo "Error".mysqli_error($con);
}
} ?>

<script type="text/javascript">
    //when the webpage has loaded do this
    $(document).ready(function() {  
        //if the value within the dropdown box has changed then run this code            
        $('#num_cat').change(function(){
            //get the number of fields required from the dropdown box
            var num = $('#num_cat').val();                  

            var i = 0; //integer variable for 'for' loop
            var textboxes = ''; //string variable for html code for fields 
            //loop through to add the number of fields specified
            for (i=1;i<=num;i++) {
                //concatinate number of fields to a variable
                textboxes += 'Category'+i+': <input type="text" name="category[]' + i + '" placeholder = "category_' + i + '" /><br/>'; 
            }

            //insert this html code into the div with id catList
            $('#catList').html(textboxes);
        });
    }); 
</script>


 <form method="post" action="">
    Number of fields required:      
    <select id="num_cat" name="num_cat">
        <option value="0">- SELECT -</option>
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
        <option value="5">5</option>
        <option value="6">6</option>
        <option value="7">7</option>
        <option value="8">8</option>
        <option value="9">9</option>
        <option value="10">10</option>
    </select>
    <div id="catList"></div>
    <input type="submit" name="submit" value="Submit"/>
</form>

Answer 1

如果你更新你的javascript来写这个（从名称中删除' + i + '）：

textboxes += 'Category'+i+': <input type="text" name="category[]" placeholder = "category_' + i + '" /><br/>';

然后$_POST['category']将是一个数组。然后，它取决于您希望如何存储值，但假设您需要三行，则需要执行此操作：

foreach ($_POST['category'] as $key) {
  $insertquery = mysqli_query($con, "INSERT INTO accounts (accountusername, accountemail) VALUES('".$num_cat."', '".$key."')");
  if(!$insertquery){
    echo "Error".mysqli_error($con);
  }
}

这解释为in the PHP manual。请同时查看how can I prevent SQL-injection in PHP?，因为您当前的代码很容易受到简单攻击。

如何使用mysqli在数据库中添加生成的文本框的值

1 个答案: