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      织梦同一页面调用多个相同的js联动菜单


      <!--

      //选择地区的二级分类(非通用调用)

      function selNext(oj, v)

      {

      var newobj = oj.options;

      var selv = parseInt(v);

      var maxv = parseInt(v) + 500;

      while(newobj.length > 0) {

      oj.remove(0);

      }

      clear(oj);

      if(selv==0)

      {

      aOption = document.createElement('OPTION');

      aOption.text = '具体地区';

      aOption.value = '0';

      oj.options.add(aOption);

      return;

      }

      else

      {

      aOption = document.createElement('OPTION');

      aOption.text = '具体地区';

      aOption.value = '0';

      oj.options.add(aOption);

      }

      var str = '';

      for(i=selv+1; i < maxv; i++)

      {

      if(!em_nativeplaces[i]) continue;

      aOption = document.createElement('OPTION');

      aOption.text = em_nativeplaces[i];

      aOption.value = i;

      oj.options.add(aOption);

      }

      }

      //子类改变事件

      function ChangeSon()

      {

      /*

      var emname = this.name.replace('_son', '');

      var topSelObj = document.getElementById(emname+'_top');

      if(this.options[this.selectedIndex].value==0) {

      document.getElementById('hidden_'+emname).value = topSelObj.options[topSelObj.selectedIndex].value;

      }

      else {

      document.getElementById('hidden_'+emname).value = this.options[this.selectedIndex].value;

      }

      */

      // 由于支持3级联动,所以这里需要对自己改变进行重构

      var emname = this.name.replace('_son', '');

      // alert(emname);

      if( document.getElementById(idname+'_sec') )

      {

      var oj = document.getElementById(idname + '_sec');

      }

      else

      {

      var oj = document.createElement('select');

      oj.name = emname + '_sec';

      oj.id = idname + '_sec';

      oj.onchange = ChangeSec;

      }

      var v = this.options[this.selectedIndex].value;

      document.getElementById('hidden_'+idname).value = v;

      var newobj = oj.options;

      var selarr = eval('em_'+emname+'s');

      var selv = parseInt(v);

      var maxv = parseInt(v) + 0.5;

      // alert(maxv);

      i = 0;

      while(newobj && newobj.length > 0) oj.remove(0);

      clear(oj);

      if(selv == 0)

      {

      aOption = document.createElement('OPTION');

      aOption.text = '请选择..';

      aOption.value = '0';

      oj.options.add(aOption);

      return;

      }

      else

      {

      aOption = document.createElement('OPTION');

      aOption.text = '请选择..';

      aOption.value = '0';

      oj.options.add(aOption);

      }

      var str = '';

      var j=0;

      for(i = selv + 0.001; i < maxv; i = FloatAdd(i, 0.001))

      {

      if(!selarr[i]) continue;

      aOption = document.createElement('OPTION');

      aOption.text = selarr[i];

      aOption.value = i;

      oj.options.add(aOption);

      j++;

      }

      if(j > 0) document.getElementById('span_'+idname+'_sec').appendChild(oj);

      else document.getElementById('span_'+idname+'_sec').innerHTML = "";

      }

      // 改变第三级的事件

      function ChangeSec()

      {

      var emname = this.name.replace('_sec', '');

      var topSelObj = document.getElementById(idname+'_top');

      if(this.options[this.selectedIndex].value==0) {

      document.getElementById('hidden_'+idname).value = topSelObj.options[topSelObj.selectedIndex].value;

      }

      else {

      document.getElementById('hidden_'+idname).value = this.options[this.selectedIndex].value;

      }

      }

      //顶级类改变事件

      function selNextSon()

      {

      var emname = this.name.replace('_top', '');

      var idname = this.id.replace('_top', '');

      if( document.getElementById(idname+'_son') )

      {

      var oj = document.getElementById(idname + '_son');

      }

      else

      {

      var oj = document.createElement('select');

      oj.name = emname + '_son';

      oj.id = idname + '_son';

      oj.onchange = ChangeSon;

      }

      var v = this.options[this.selectedIndex].value;

      document.getElementById('hidden_'+idname).value = v;

      var newobj = oj.options;

      var selarr = eval('em_'+emname+'s');

      var selv = parseInt(v);

      var maxv = parseInt(v) + 500;

      while(newobj && newobj.length > 0) oj.remove(0);

      clear(oj);

      if(selv==0)

      {

      aOption = document.createElement('OPTION');

      aOption.text = '请选择..';

      aOption.value = '0';

      oj.options.add(aOption);

      return;

      }

      else

      {

      aOption = document.createElement('OPTION');

      aOption.text = '请选择..';

      aOption.value = '0';

      oj.options.add(aOption);

      }

      var str = '';

      for(i=selv+1; i < maxv; i++)

      {

      if(!selarr[i]) continue;

      aOption = document.createElement('OPTION');

      aOption.text = selarr[i];

      aOption.value = i;

      oj.options.add(aOption);

      }

      document.getElementById('span_'+idname+'_son').appendChild(oj);

      }

      // 根据数组生成多级联动菜单

      function MakeTopSelect(emname,idname, selvalue)

      {

      var selectFormHtml = '';

      var aOption = null;

      var selObj = document.createElement("select");

      selObj.name = emname + '_top';

      selObj.id = idname + '_top';

      selObj.onchange = selNextSon;

      var selarr = eval('em_'+emname+'s');

      // alert(selarr[1002.2]);

      var topvalue = 0;

      var sonvalue = 0;

      var secvalue = 0;

      aOption = document.createElement('OPTION');

      aOption.text = '请选择..';

      aOption.value = 0;

      selObj.options.add(aOption);

      // alert(selvalue);

      if(selvalue % 500 == 0 )

      {

      topvalue = selvalue;

      }

      // 如果是小数,则依次取出顶级数值,二级数值以及三级数值

      else if(!!(selvalue % 1))

      {

      secvalue = selvalue;

      sonvalue = Math.floor(selvalue);

      topvalue = sonvalue - (sonvalue % 500);

      // alert(secvalue);

      }

      else {

      sonvalue = selvalue;

      topvalue = selvalue - (selvalue % 500);

      }

      for(i = 500; i <= selarr.length; i += 500)

      {

      if(!selarr[i]) continue;

      aOption = document.createElement('OPTION');

      if(i == topvalue) {

      aOption = document.createElement('OPTION');

      aOption.text = selarr[i];

      aOption.value = i;

      selObj.options.add(aOption);

      aOption.selected = true;

      }

      else {

      aOption = document.createElement('OPTION');

      aOption.text = selarr[i];

      aOption.value = i;

      selObj.options.add(aOption);

      }

      }

      document.getElementById('span_'+idname).appendChild(selObj);

      //如果子类存在值,创建子类

      //if(sonvalue > 0 || topvalue > 0) {

      selObj = document.createElement("select");

      selObj.name = emname + '_son';

      selObj.id = idname + '_son';

      selObj.onchange = ChangeSon;

      aOption = document.createElement('OPTION');

      aOption.text = '请选择..';

      aOption.value = 0;

      selObj.options.add(aOption);

      //当大类有值输出子类

      if(topvalue > 0)

      {

      var selv = topvalue;

      var maxv = parseInt(topvalue) + 500;

      for(i = selv + 1; i < maxv; i++)

      {

      if(!selarr[i]) continue;

      aOption = document.createElement('OPTION');

      if(i == sonvalue) {

      aOption = document.createElement('OPTION');

      aOption.text = selarr[i];

      aOption.value = i;

      selObj.options.add(aOption);

      aOption.selected = true;

      }

      else {

      aOption = document.createElement('OPTION');

      aOption.text = selarr[i];

      aOption.value = i;

      selObj.options.add(aOption);

      }

      }

      }

      document.getElementById('span_'+idname+'_son').appendChild(selObj);

      // 若存在第三级则创建

      if(secvalue > 0)

      {

      selObj = document.createElement("select");

      selObj.name = emname + '_sec';

      selObj.id = idname + '_sec';

      selObj.onchange = ChangeSec;

      aOption = document.createElement('OPTION');

      aOption.text = '请选择..';

      aOption.value = 0;

      selObj.options.add(aOption);

      var selv = sonvalue;

      var maxv = parseInt(sonvalue) + 0.5;

      // alert(maxv);

      i = 0;

      for(i = selv + 0.001; i < maxv; i = FloatAdd(i, 0.001))

      {

      if(!selarr[i]) continue;

      aOption = document.createElement('OPTION');

      if(i == secvalue) {

      aOption = document.createElement('OPTION');

      aOption.text = selarr[i];

      aOption.value = i;

      selObj.options.add(aOption);

      aOption.selected = true;

      }

      else {

      aOption = document.createElement('OPTION');

      aOption.text = selarr[i];

      aOption.value = i;

      selObj.options.add(aOption);

      }

      }

      }

      document.getElementById('span_'+idname+'_sec').appendChild(selObj);

      }

      // 两个小数相加进度计算

      function FloatAdd(arg1, arg2)

      {

      var r1,r2,m;

      try{r1=arg1.toString().split(".")[1].length}catch(e){r1=0}

      try{r2=arg2.toString().split(".")[1].length}catch(e){r2=0}

      m=Math.pow(10,Math.max(r1,r2))

      return (arg1*m+arg2*m)/m

      }

      //清除旧对象

      function clear(o)

      {

      l=o.length;

      for (i = 0; i< l; i++){

      o.options[1]=null;

      }

      }

      -->

      将上面代码保存为新的js文件,注意不要覆盖官方原来的,否则可能因为后续的多级联动菜单添加而反复修改文件

      <script language="javascript" type="text/javascript" src="你自定义的js文件目录"></script>

      这句不多说

      注意在页面的运行脚本中,原来的两个参数改成了三个,第一个是联动类型的英文名称,具体请在后台查看

      第二个参数是你自定义的id,防止页面上出现重复id的现象,第三个参数是初始选项

      <script language="javascript" type="text/javascript">MakeTopSelect("MyArea","IdName", 0);</script>

      www.1click-soft.comtruehttp://www.1click-soft.com/dedecms/1277930.htmlTechArticle织梦同一页面调用多个相同的js联动菜单 !-- //选择地区的二级分类(非通用调用) function selNext(oj, v) { var newobj = oj.options; var selv = parseInt(v);...

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