Question

这些是我的问题：

我从两个下拉列表中选择的值将更改回其默认值当浏览器在表单中实现onchange函数时。
我想创建一个表，数据应该与之相同我从第二个下拉列表中选择的表格。

这是我的代码

PHP

<?php
   $connectDatabase = mysql_connect("localhost","root","") or die(mysql_error());
   $tables = array();
     if(isset($_POST['select_db'])) 
     { // if its submitted 
         $select_db = $_POST['select_db'];
         $mysql_select_db = mysql_select_db($select_db,$connectDatabase);
         $drop_table = mysql_query("DROP TABLE pdf_table",$connectDatabase);
         $query = "SHOW TABLES FROM $select_db";
         $mysql_query = mysql_query($query,$connectDatabase);
       while($row =mysql_fetch_assoc($mysql_query)) 
       {
          $tables[] = $row['Tables_in_' . $select_db]; // use associative instead
       }
    }
    if(isset($_POST['select_table']))
    {
        $select_table = $_POST['select_table'];
        $db = mysql_select_db($select_db,$connectDatabase);
        $query_select = "Create Table pdf_table AS ( SELECT * FROM $select_table)";
        $select_query = mysql_query($query_select,$connectDatabase);
    }
    ?>

HTML CODE

 <form class="Search_Form" action="moduleindex.php" method="POST">
        <select name="select_db" onchange="this.form.submit();">
            <option disabled selected>Select Database</option>
            <option>section_masterfile</option>
        </select>
        <select onchange="this.form.submit();" name="select_table">
            <option disabled selected>Select Table</option>
            <?php foreach($tables as $table): ?>
            <option value="<?php echo $table; ?>"><?php echo $table; ?></option>
            <?php endforeach; ?>
        </select>
</form>

Answer 1

如果发布了一些值且值等于循环值

，则在生成选项时添加检查foreach循环

  <select onchange="this.form.submit();" name="select_table">
                <option disabled selected>Select Table</option>
                <?php foreach($tables as $table){?>
                 <?php 
                 $selected ="";
                 if(isset($_POST['select_table']) && $_POST['select_table'] ==  $table){ 

                         $selected = 'selected="selected"'; 


                     } ?>
                <option value="<?php echo $table; ?>"  <?php echo $selected ;?>  ><?php echo $table; ?></option>
                <?php }?>
            </select>

我想选择一个表并使用我选择的表中的相同数据创建一个表

1 个答案: