欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  php教程

ajax级联菜单实现方法实例分析

程序员文章站 2024-01-31 14:52:22
...
这篇文章主要介绍了ajax级联菜单实现方法,结合实例形式分析了基于ajax与后台php交互实现级联菜单功能的相关操作技巧,需要的朋友可以参考下

本文实例讲述了ajax级联菜单实现方法。分享给大家供大家参考,具体如下:

效果如下:

ajax级联菜单实现方法实例分析

选择第一项,第二项、第三项的内容跟着改变。
选择第二项,第三项的内容跟着改变。
第三项则不影响第一项和第二项。

有几点值得提:

1.html到底是前台拼接还是后台拼接。

我选择的是前台拼接,这样可以节省流量,和后台的资源。这也比较符合程序处理,一般后台只负责提供数据。

通过json传递给前台,完了前台获取进行处理。

ajax函数

function ajaxgetbigclass(val){
  $.ajax({
      type:"POST",
      async:false, 
      url:"/default/index/ajax/do/ajaxgetbigclass",
      data:"typeid="+val,
      success:function(response){
        if(response){
          res = response;
        }else{
          res = false;
        }
      }
    });
  return res;
}
function ajaxgetsmallclass(val){
  $.ajax({
      type:"POST",
      async:false, 
      url:"/default/index/ajax/do/ajaxgetsmallclass",
      data:"bigclassid="+val,
      success:function(response){
        if(response){
          res = response;
        }else{
          res = false;
        }
      }
    });
  return res;
}

后台ajax处理代码

case 'ajaxgetbigclass': 
$typeid = trim($this->_getParam('typeid'));
$daoNews = new dao_news();
if(isset($typeid)){
  $bigClass = $daoNews->getBigClassByType($typeid,true);
  if($bigClass){
    $json = json_encode($bigClass);
    echo $json;
  }else{
    echo FALSE;
  }
}else{
  echo FALSE;
}
break;
case 'ajaxgetsmallclass': 
$bigclassid = trim($this->_getParam('bigclassid'));
$daoNews = new dao_news();
if(isset($bigclassid)){
  $smallClass = $daoNews->getSmallClassByBigClass($bigclassid,true);
  if($smallClass){
    $json = json_encode($smallClass);
    echo $json;
  }else{
    echo FALSE;
  }
}else{
  echo FALSE;
}
break;

调用ajax函数,并拼接成html函数

function setbigclass(id,flag){
    var flag = arguments[1] ? arguments[1] : false;//默认值
    var res = ajaxgetbigclass(id);
    //alert(res);
    if(res){
      myobj = eval(res);
      for(var i=0;i<myobj.length;i++){ 
          strHtml+="<option value='"+myobj[i].id+"'>"+myobj[i].name+"</option>";
      } 
      $("#bigclassid").html(strHtml);
    }else{
      var strHtml = "<option value=''>无子选项</option>";
      $("#bigclassid").html(strHtml);
    }
    if(flag&&res){
      return myobj[0].id;
    }
}
function setsmallclass(id){
    var res = ajaxgetsmallclass(id);
    //alert(res);
    if(res){
      myobj = eval(res);
      var strHtml = "<option value=''>请选择</option>";
      for(var i=0;i<myobj.length;i++){ 
          strHtml+="<option value='"+myobj[i].id+"'>"+myobj[i].name+"</option>";
      } 
      $("#smallclassid").html(strHtml);
    }else{
      var strHtml = "<option value=''>请选择</option><option value=''>无子选项</option>";
      $("#smallclassid").html(strHtml);
  }
}

主函数,事件动作

$(function(){
  //ajax级联
  $("#typeid").change(function(){
    var id = $(this).val();
    var res = setbigclass(id,true);
    if(res){
      setsmallclass(res);
    }else{
      setsmallclass(0);
    }
  });
  $("#bigclassid").change(function(){
    var id = $(this).val();
    setsmallclass(id);
  });
});

2.后台查询函数化。

public function getType($where = false, $order = 'typeid ASC', $pagesize = false, $offset = false, $count = false, $from = false, $join = false, $group = false){
    return $this->getData($this->_typename,$where,$order,$pagesize,$offset,$count,$from,$join,$group);
}
public function getTypeName($flag=false){
    $where = array();
    $aType = $this->getType($where);
    if($aType){
      if($flag){
        foreach ($aType as $key => $value) {
          $type[$key]['id'] = $value['typeid'];
          $type[$key]['name'] = $value['typename'];
        }
        return $type;
      }else{
        foreach ($aType as $key => $value) {
          $type[$value['typeid']] = $value['typename'];
        }
        return $type;
      }
    }else{
      return false;
    }
}
public function getBigClass($where = false, $order = 'BigClassID ASC', $pagesize = false, $offset = false, $count = false, $from = false, $join = false, $group = false){
    return $this->getData($this->_bigname,$where,$order,$pagesize,$offset,$count,$from,$join,$group);
}
public function getBigClassByType($typeid = 60,$flag=false){
    $where = array();
    $where['BigClass.typeid =?'] = array("type"=>1,"val"=>$typeid);
    //print_r($where);exit;
    $from = array('BigClassID',"BigClassName","convert(text,BigClassMaster) as BigClassMaster","typeid"); 
    $aBigClass = $this->getBigClass($where, false, false, false, false,$from);
    if($aBigClass){
      if($flag){
        foreach ($aBigClass as $key => $value) {
          $bigClass[$key]['id'] = $value['BigClassID'];
          $bigClass[$key]['name'] = $value['BigClassName'];
        }
        return $bigClass;
      }else{
        foreach ($aBigClass as $key => $value) {
          $bigClass[$value['BigClassID']] = $value['BigClassName'];
        }
        return $bigClass;
      }
    }else{
      return false;
    }
}
public function getSmallClass($where = false, $order = 'SmallClassID ASC', $pagesize = false, $offset = false, $count = false, $from = false, $join = false, $group = false){
    return $this->getData($this->_smallname,$where,$order,$pagesize,$offset,$count,$from,$join,$group);
}
public function getSmallClassByBigClass($BigClassID = 221,$flag=false){
    $where = array();
    $where['SmallClass.BigClassID =?'] = array("type"=>1,"val"=>$BigClassID);
    //print_r($where);exit;
    $aSmallClass = $this->getSmallClass($where);
    if($aSmallClass){
      if($flag){
        foreach ($aSmallClass as $key => $value) {
          $smallClass[$key]['id'] = $value['SmallClassID'];
          $smallClass[$key]['name'] = $value['smallclassname'];
        }
        return $smallClass;
      }else{
        foreach ($aSmallClass as $key => $value) {
          $smallClass[$value['SmallClassID']] = $value['smallclassname'];
        }
        return $smallClass;
      }
    }else{
      return false;
    }
}

这样就可以多处使用,多种角度使用。

3.前台js,文件化,同一个功能的js放在一个js文件中。内容最后也函数化。

<script type="text/javascript" src="/js/news/cascade.js"></script>
<tr>
<td width="20%" height="56" align="right" >请选择分类:</td>
<td width="80%" style="padding:10px;">
<select id="typeid" name="typeid" class=" ffb-input">
    <!--{html_options options=$aType selected=$aData.typeid|default:'0'}-->
</select>
>
<select id="bigclassid" name="bigclassid" class=" ffb-input">
    <!--{html_options options=$aBigClass selected=$aData.bigclassid|default:'0'}-->
</select>
>
<select id="smallclassid" name="smallclassid" class=" ffb-input">
    <option value="">请选择</option>
    <!--{html_options class=" ffb-input" options=$aSmallClass selected=$aData.smallclassid|default:'0'}-->
</select>
</td>
</tr>

这样会让文件很清晰。

优化后的js

$(function(){
  //ajax级联
  $("#typeid").change(function(){
    var id = $(this).val();
    setbigclass(id);
  });
  $("#bigclassid").change(function(){
    var id = $(this).val();
    setsmallclass(id);
  });
});
function setbigclass(id){
    var res = ajaxgetbigclass(id);
    var strHtml;
    if(res){
      myobj = eval(res);
      for(var i=0;i<myobj.length;i++){
          strHtml+="<option value='"+myobj[i].id+"'>"+myobj[i].name+"</option>";
      } 
      $("#bigclassid").html(strHtml);
      $("#bigclassid").show().change();
    }else{
      $("#bigclassid").hide();
      $("#smallclassid").hide();
    }
}
function setsmallclass(id){
    var res = ajaxgetsmallclass(id);
    if(res){
      myobj = eval(res);
      var strHtml = "<option value=''>请选择</option>";
      for(var i=0;i<myobj.length;i++){ 
          strHtml+="<option value='"+myobj[i].id+"'>"+myobj[i].name+"</option>";
      } 
      $("#smallclassid").html(strHtml);
      $("#smallclassid").show();
    }else{
      $("#smallclassid").hide();
  }
}
function ajaxgetbigclass(val){
  $.ajax({
      type:"POST",
      async:false, 
      url:"/default/index/ajax/do/ajaxgetbigclass",
      data:"typeid="+val,
      success:function(response){
        if(response){
          res = response;
        }else{
          res = false;
        }
      }
    });
  return res;
}
function ajaxgetsmallclass(val){
  $.ajax({
      type:"POST",
      async:false, 
      url:"/default/index/ajax/do/ajaxgetsmallclass",
      data:"bigclassid="+val,
      success:function(response){
        if(response){
          res = response;
        }else{
          res = false;
        }
      }
    });
  return res;
}
相关标签: ajax 级联菜单