如果选项值已存在，则禁用选择选项

Question

我正在创建库会员表单，在此形式中，学生列表通过选择选项中的ajax请求进行填充。现在我需要禁用已经是图书馆成员的学生选项。

表单视图

<div class="form-group"> 
    <div class="input-group"> 
    <span class="input-group-addon"><i class="fa fa-asterisk" aria-hidden="true"></i> <i class="fa fa-calendar" aria-hidden="true"></i> <?php echo get_phrase('_batch'); ?></span> 
    <select id="batch_result_holder" name="batch_result_holder" onchange="return get_batchs_students(this.value)" data-plugin="select2" required> 
     <option disabled selected value=""> <?php echo get_phrase('select_programs_first'); ?></option> 
    </select> 
    </div> 
</div><!-- form-group --> 

<div class="form-group"> 
    <div class="input-group"> 
    <span class="input-group-addon"><i class="fa fa-asterisk" aria-hidden="true"></i> <i class="fa fa-user" aria-hidden="true"></i> <?php echo get_phrase('_student'); ?></span> 
    <select id="student_result_holder" name="student_result_holder" data-plugin="select2" > 
     <option disabled selected> <?php echo get_phrase('select_batch_first'); ?></option> 
    </select> 
    </div> 
</div><!-- form-group --> 

Ajax代码来拉学生信息

function get_batchs_students(batch_result_holder){ 
    var program_id = $('#program_id').val(); 
    $.ajax({ 
    type:"POST", 
    url: '<?php echo base_url();?>index.php?admin/get_batch_students_without_assigned/', 
    data:{batch_result_holder: batch_result_holder, program_id:program_id}, 

    success: function(response) 
    { 
     jQuery('#student_result_holder').html(response); 
    } 
    }); 
} 

控制器，拉学生名单

function get_batch_students_without_assigned($program_id, $batch_id, $status){ 
    $program_id = $this->input->post('program_id'); 
    $batch_id = $this->input->post('batch_result_holder'); 
    $students = $this->crud_model->get_student_list_without_section($program_id, $batch_id, 1); 
    $assigned_student = $this->crud_model->get_assigned_students(); 
    echo '<option value="" selected disabled> select from list below </option>'; 
    foreach($assigned_student as $row2): 
    foreach($students as $row){ 

     echo '<option value="' . $row['student_id'] . '"'; 
     if($row['student_id'] == $row2['type_id']): 
     echo 'disabled'; 
     endif; 
     echo '>'; 
     echo $row['name']; 
     echo '</option>'; 
    } 
    endforeach; 
} 

但上述控制器会遍历所有学生和分配的学生，并输出关于禁用和非禁用格式的相同学生选项。那么，我如何防止这个控制器显示所有学生都是已经是会员的残疾学生。

output of the above controller

Answer 1

您可以收集在一个数组分配的学生的身份证，并检查环的student_id数据是否是数组中：

$assigned = array(); 
    foreach($assigned_student as $row2) { 
    $assigned[] = $row2['student_id']; 
    } 
    foreach($students as $row){} 
     echo '<option value="' . $row['student_id'] . '"'; 
     if(in_array($row['student_id'], $assigned): 
     echo 'disabled'; 
     endif; 
     echo '>'; 
     echo $row['name']; 
     echo '</option>'; 
    endforeach;