Question

我正在尝试进行选择，这将对我的“编辑用户”页面有帮助。我有这段代码，但是我不知道如何更改它，因此我可以加载从数据库中选择的值。这段代码正在起作用...

<div class="form-group">
    <th><label for="text">Tipo Sanguineo:</label></th>
    <td><select class="form-control" id="sangue" name="tipo_sangue">
    <option value="O-" <?php if ($cl_tipo_sangue == "O-") echo 'selected';?> >O-</option>
    <option value="O+" <?php if ($cl_tipo_sangue == "O+") echo 'selected';?> >O+</option>
    <option value="A-" <?php if ($cl_tipo_sangue == "A-") echo 'selected';?> >A-</option>
    <option value="A+" <?php if ($cl_tipo_sangue == "A+") echo 'selected';?> >A+</option>
    <option value="B-" <?php if ($cl_tipo_sangue == "B-") echo 'selected';?> >B-</option>
    <option value="B+" <?php if ($cl_tipo_sangue == "B+") echo 'selected';?> >B+</option>
    <option value="AB-" <?php if ($cl_tipo_sangue == "AB-") echo 'selected';?> >AB-</option>
    <option value="AB+" <?php if ($cl_tipo_sangue == "AB+") echo 'selected';?> >AB+</option>
</select></td>
  </div>

我需要使用以下代码执行此操作：

<?php $dts = DBRead11(); ?>
<select name="diretor_turma" id="diretor_turma" required class="input-field4">
  <?php
    foreach($dts as $option) {
  ?>
    <option value="<?php echo $option['nome']; ?>"><?php echo $option['nome']; ?></option>
  <?php
    }
  ?>
</select>

我需要更改的代码是将值从数据库加载到站点，而且我不确定如果从数据库中加载选定的值，怎么看。

Answer 1

尝试一下

<?php $dts = DBRead11(); ?>
<?php $cl_tipo_sangue = "B+"; ?>// here you need to add db value which you saved in DB
<select name="diretor_turma" id="diretor_turma" required class="input-field4">
  <?php
    foreach($dts as $option) {
  ?>
    <option value="<?php echo $option['nome']; ?>" <?php if ($cl_tipo_sangue == $option['nome']) { echo 'selected="selected"'; } ?> ><?php echo $option['nome']; ?></option>
  <?php
    }
  ?>
</select>

Answer 2

步骤：

1）获取一个数组，以保存下拉选项的ID名称对。

2）在<select>标签中的<option>上对其进行循环。

3）检查所选ID是否为当前迭代ID。

4）如果是，则将属性selected="selected"添加到当前的<option>

然后在循环中检查是否已选择一个。

<?php
$bloodGroups = [
'O-' => 'O-',
'O+' => 'O+',
'A-' => 'A-',
'A+' => 'A+',
'B-' => 'B-',
'B+' => 'B+',
'AB-' => 'AB-',
'AB+' => 'AB+'
];
?>
<div class="form-group">
    <th><label for="text">Tipo Sanguineo:</label></th>
    <td><select class="form-control" id="sangue" name="tipo_sangue">
    <?php
    if (! empty($bloodGroups)) {
     foreach ($bloodGroups as $bgid => $bloodGroup) {
      $selected = ($cl_tipo_sangue == $bgid) ? 'selected="selected"' : '';
?>
<option value="<?php echo $bgid;?>" <?php echo $selected;?>><?php echo $bloodGroup;?></option>
<?php
     }
    }
    ?>
</select></td>
  </div>

Answer 3

使用javascript

<?php $dts = DBRead11(); ?>
<select name="diretor_turma" id="diretor_turma" required class="input-field4">
  <?php
    foreach($dts as $option) {
  ?>
    <option value="<?php echo $option['nome']; ?>"><?php echo $option['nome']; ?></option>
  <?php
    }
  ?>
</select>
<script>
    document.querySelector('#diretor_turma').value = '<?= $cl_tipo_sangue ?>'
</script>

Answer 4

然后您需要获取保存在数据库中的值

 <?php
  $nome = $database_value;

?>
<select name="diretor_turma" id="diretor_turma" required class="input-field4">
  <?php
    foreach($dts as $option) {
  ?>
    <option value="<?php echo $option['nome']; ?>" <?php echo ($option['nome'] == $nome)?'selected':'' ?>><?php echo $option['nome']; ?></option>
  <?php
    }
  ?>
</select>

Answer 5

<select name="diretor_turma" id="diretor_turma" required class="input-field4">
        <?php 
        foreach($dts as $option) {
            $select = (isset($cl_tipo_sangue) && $cl_tipo_sangue == $option['nome'])?"selected = 'selected'":"";?>
            <option value="<?php echo $option['nome']; ?>"  <?php echo $select; ?>><?php echo $option['nome']; ?></option>
        <?php } ?>
</select>

如何从PHP中的数据库中选择一个选定的值

5 个答案: