选择基于另一个选择使用PHP不工作

使用PHP Select基于另一个select仅在添加新行时不起作用。

有关演示访问（请参阅演示步骤）

加载页面时有两行，它们按预期工作。（服务选项按项目选项）
单击“添加行”按钮，将添加另一行
新插入的行无效。（服务选择没有提供任何选项，前两个给出）

我尝试了什么：

  runQuery("SELECT * FROM service WHERE IRN=:irn ORDER BY Sr ASC "); $stmt->bindParam(':irn',$id); $stmt->execute(); $stmtin=$user_home->runQuery("SELECT * FROM item WHERE IRN=:irn ORDER BY Sr ASC "); $stmtin->bindParam(':irn',$id); $stmtin->execute(); $rowin=$stmtin->fetch( PDO::FETCH_ASSOC ); if( $stmt->rowCount() > 0 ){ echo "Select Service ({$rowin['Name']})"; while( $row=$stmt->fetch( PDO::FETCH_ASSOC ) ){ echo "{$row['Name']}"; } } } exit(); } ?>     function ajax(m,u,p,c,o){ var xhr=new XMLHttpRequest(); xhr.onreadystatechange=function(){ if( xhr.readyState==4 && xhr.status==200 )c.call( this, xhr.response, o, xhr.getAllResponseHeaders() ); }; var params=[]; for( var n in p )params.push(n+'='+p[n]); switch( m.toLowerCase() ){ case 'post': p=params.join('&'); break; case 'get': u+='?'+params.join('&'); p=null; break; } xhr.open( m.toUpperCase(), u, true ); xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded'); xhr.send( p ); } function createmenu(r,o,h){ o.menu.innerHTML=r; } function bindEvents(){ var oSelItem=document.querySelector('select[name="item1"]'); var oSelService=document.querySelector('select[name="service1"]'); oSelItem.onchange=function(e){ var method='post'; var url=location.href; var params={ 'action':'get_dependant_menu', 'id':this.options[ this.options.selectedIndex ].value }; var opts={ menu:oSelService }; ajax.call( this, method, url, params, createmenu, opts ); }.bind( oSelItem ); } document.addEventListener( 'DOMContentLoaded', bindEvents,false );          
  Item  Service  Qty  
    Select Item runQuery("SELECT * FROM item ORDER BY Sr ASC "); $stmt->execute(); if( $stmt->rowCount() > 0 ){ while( $row=$stmt->fetch( PDO::FETCH_ASSOC ) ){ echo "{$row['Name']}"; } } ?>     
    Select Item runQuery("SELECT * FROM item ORDER BY Sr ASC "); $stmt->execute(); if( $stmt->rowCount() > 0 ){ while( $row=$stmt->fetch( PDO::FETCH_ASSOC ) ){ echo "{$row['Name']}"; } } ?>     
    
 
  
      Select Item runQuery("SELECT * FROM item ORDER BY Sr ASC "); $stmt->execute(); if( $stmt->rowCount() > 0 ){ while( $row=$stmt->fetch( PDO::FETCH_ASSOC ) ){ echo "{$row['Name']}"; } } ?>

mysql> describe irn_item; +-------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------+------------------+------+-----+---------+----------------+ | irn | int(10) unsigned | NO | PRI | NULL | auto_increment | | name | varchar(50) | YES | | NULL | | +-------+------------------+------+-----+---------+----------------+ mysql> select * from irn_item; +-----+------------+ | irn | name | +-----+------------+ | 1 | Shirt | | 2 | Trousers | | 3 | Jacket | | 4 | Socks | | 5 | Underpants | | 6 | Hat | +-----+------------+ mysql> describe irn_service; +-------------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+------------------+------+-----+---------+----------------+ | srn | int(10) unsigned | NO | PRI | NULL | auto_increment | | irn | int(10) unsigned | NO | MUL | 1 | | | instruction | varchar(50) | NO | | 1 | | +-------------+------------------+------+-----+---------+----------------+ mysql> select * from irn_service; +-----+-----+-----------------------+ | srn | irn | instruction | +-----+-----+-----------------------+ | 1 | 2 | Iron | | 2 | 1 | Dry Clean Only | | 3 | 3 | Hi-Pressure dry clean | | 4 | 4 | Steam Clean | | 5 | 5 | Decontaminate | | 6 | 6 | Waterproof | +-----+-----+-----------------------+

prepare( $sql ); if( $stmt ){ $stmt->bind_param( 's', $id ); $stmt->execute(); $stmt->store_result(); $stmt->bind_result( $srn, $instruction ); while( $stmt->fetch() ){ $html[]="

选择基于另一个选择使用PHP不工作

Chained select menus using basic ajax

将路由从状态提供者转换为路由提供者

你如何在angularjs中旋转图像

Javascript无限滚动限制/去抖动

提交带有onSubmit的表单

Firefox上的奇怪页面错误

在父级（相同的域）中单击iframe open事件内部？

Javascript – 动态更改函数的内容

使用Fancybox，IE8中的图像溢出了容器

使用JavaScript / Jquery关闭.aspx

用于检查属性是否存在的简写函数

Item	Service	Qty

Select Item runQuery("SELECT * FROM item ORDER BY Sr ASC "); $stmt->execute(); if( $stmt->rowCount() > 0 ){ while( $row=$stmt->fetch( PDO::FETCH_ASSOC ) ){ echo "{$row['Name']}"; } } ?>
Select Item runQuery("SELECT * FROM item ORDER BY Sr ASC "); $stmt->execute(); if( $stmt->rowCount() > 0 ){ while( $row=$stmt->fetch( PDO::FETCH_ASSOC ) ){ echo "{$row['Name']}"; } } ?>