JavaScript 需要从复选框数组中选中一个复选框

javascript require a checkbox to be checked from an array of checkboxes

本文关键字：复选框 一个 数组 JavaScript      更新时间：2023-09-26

我正在尝试弄清楚如何使用javascript为一组复选框（php数组）制作必填字段。

    <?php 
    $hobbiesIndex=0;
    foreach ($hobbies_checkbox as $option => $options){?>
   <input type='checkbox' id='hobbies' name='hobbies[<?php echo $hobbiesIndex; ?>]' value='<?php echo $option;?>'
   <?php if(!empty($hobbies[$hobbiesIndex])){ echo "checked='checked'";} ?> /><label for='hobbies<?php echo $hobbiesIndex ; ?>'><?php echo $options;?></label><br />
  <?php $hobbiesIndex++; }?>

对浏览器看到的内容进行 HTML 编码;p

      <input type='checkbox' id='hobbies0' name='hobbies[0]' value='1'/><label for='hobbies0'>football</label><br />
      <input type='checkbox' id='hobbies1' name='hobbies[1]' value='2'/><label for='hobbies1'>soccer</label><br />
      <input type='checkbox' id='hobbies2' name='hobbies[2]' value='3'/><label for='hobbies2'>baseball</label><br />
     <input type='checkbox' id='hobbies3' name='hobbies[3]' value='4'/><label for='hobbies3'>tennis</label><br /> 

if($('input:checkbox[name="hobbies[]"]:checked').length === 0){
$("#multichk").after('<span class="error">Please choose at least one.</span>');
hasError = true;
}
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