javascript高手请进,关于一个增量输入,自动完成控件的高难度的问题

Question

/* ComboBox.js" */
Global_run_event_hook = true;
Global_combo_array    = new Array();
function IsNumeric(str)
{
   var reg=/^[0-9]*\.*[0-9]*$/
   if(Trim(str)!="")
   {
if(!reg.exec(str))
{
return false;
}
   }
   else
   {
   return false;
   }
return true;
}Array.prototype.remove=function(dx)
{ 
    if(isNaN(dx)||dx>this.length){self.status='Array_remove:invalid request-'+dx;return false}
    for(var i=0,n=0;i<this.length;i++)
    {  
        if(this[i]!=this[dx])
        {
            this[n++]=this[i]
        }
    }
    this.length-=1
}function ComboBox_make()
{
    var bt,nm;
    nm = this.name+"txt"; 
    
    this.txtview = document.createElement("INPUT")
    this.txtview.type = "text";
    this.txtview.name = nm;
    this.txtview.id = nm;
    this.txtview.className = "combo-input"
    this.view.appendChild(this.txtview);
        
    this.valcon = document.createElement("INPUT");
    this.valcon.type = "hidden";
    this.view.appendChild(this.valcon)
   
    var tmp = document.createElement("IMG");
    tmp.src = "___";
    tmp.style.width = "1px";
    tmp.style.height = "0";
    this.view.appendChild(tmp);
    
    var tmp = document.createElement("BUTTON");
    tmp.appendChild(document.createTextNode(6));
    tmp.className = "combo-button";
    
this.view.appendChild(tmp);
    tmp.onfocus = function () { this.blur(); };
tmp.onclick = new Function ("", this.name + ".toggle()");
}function ComboBox_choose(realval,txtval)
{
    this.value         = realval;
    var samstring = this.name+".view.childNodes[0].value='"+txtval+"'"
    window.setTimeout(samstring,1)
    this.valcon.value  = realval;
}function ComboBox_mouseDown(e)
{
    var obj,len,el,i;
    el = e.target ? e.target : e.srcElement;
    while (el.nodeType != 1) el = el.parentNode;
    var elcl = el.className;
    if(elcl.indexOf("combo-")!=0)
    {

        len=Global_combo_array.length
        for(i=0;i<len;i++)
        {
        
            curobj = Global_combo_array[i]
            
            if(curobj.opslist)
            {
                curobj.opslist.style.display='none'
            }
        }
    }
}function ComboBox_handleKey(e)
{
    var key,obj,eobj,el,strname;
    eobj = e;
    key  = eobj.keyCode;
    el = e.target ? e.target : e.srcElement;
    while (el.nodeType != 1) el = el.parentNode;
    elcl = el.className

    if(elcl.indexOf("combo-")==0)
    {
        if(elcl.split("-")[1]=="input")
        {
            strname = el.id.split("txt")[0]
            obj = window[strname];
            obj.expops.length=0
            obj.update();
            obj.build(obj.expops);
            if(obj.expops.length==1&&obj.expops[0].text=="请重新输入"){}//empty
            else{obj.opslist.style.display='block';}
            obj.value = el.value;
            obj.valcon.value = el.value;
var Current;

 var reg=/^[0-9]*\.*[0-9]*$/
 if(reg.test(form1.Global_Position.value)==false || form1.Global_Position.value=="") form1.Global_Position.value=-1;
Current = parseInt(form1.Global_Position.value);
switch(key)
{
  case 38: 
Current--;
obj.toggle();
  break;
       case 40: 
Current++;
obj.toggle();
  break;
}
form1.Global_Position.value=Current;
if(parseInt(form1.Global_Position.value)>=0 && parseInt(form1.Global_Position.value)<=parseInt(form1.count.value))
{
objtd = document.getElementById("dm_item_"+form1.Global_Position.value);
obj.choose(objtd.innerText,objtd.innerText);
objtd.className='combo-hilite';
}
else if(parseInt(form1.Global_Position.value)>=parseInt(form1.count.value))
{
form1.Global_Position.value=form1.count.value;
}
else form1.Global_Position.value=0;

        }
     }
}function ComboBox_update()
{
    var opart,astr,alen,opln,i,boo;
    boo=false;
    opln = this.options.length
    astr = this.txtview.value.toLowerCase();
    alen = astr.length
    if(alen==0)
    {
        for(i=0;i<opln;i++)
        {
            this.expops[this.expops.length]=this.options[i];boo=true;
        }
    }
    else
    {
        for(i=0;i<opln;i++)
        {
            opart=this.options[i].text.toLowerCase().substring(0,alen)
            if(astr==opart)
            {
                this.expops[this.expops.length]=this.options[i];boo=true;
            }
        }
    }
//    if(!boo){this.expops[0]=new ComboBoxItem("","")} //???
    if(!boo){this.expops[0]=new ComboBoxItem("请重新输入","")} //???
}
function ComboBox_remove(index)
{
    this.options.remove(index)
}function ComboBox_add()
{
    var i,arglen;
    arglen=arguments.length
    for(i=0;i<arglen;i++)
    {
        this.options[this.options.length]=arguments[i]
    }
}
/* 待续 */

Answer 1

function ComboBox_build(arr)
{
    var str,arrlen
    arrlen=arr.length;
    str = '<table class="combo-list-width" cellpadding=0 cellspacing=0>';
    var strs = new Array(arrlen);
form1.count.value=0;
    for(var i=0;i<arrlen;i++)
    {
        strs[i] = '<tr>' +
'<td  id="'+this.name+'_item_'+i+'" class="combo-item" onClick="'+this.name+'.choose(\''+arr[i].value+'\',\''+arr[i].text+'\');'+this.name+'.opslist.style.display=\'none\';"' +
'onMouseOver="this.className=\'combo-hilite\';" onMouseOut="this.className=\'combo-item\'" >&nbsp;'+arr[i].text+'&nbsp;</td>' +
'</tr>';
form1.count.value=i;
    }
    str = str + strs.join("") + '</table>'
// alert(str);
    if(this.opslist){this.view.removeChild(this.opslist);}
    
    this.opslist = document.createElement("DIV")
    this.opslist.innerHTML=str;
    this.opslist.style.display='none';
    this.opslist.className = "combo-list";
    this.opslist.onselectstart=returnFalse;
    this.view.appendChild(this.opslist);    
}function ComboBox_toggle()
{
form1.Global_Position.value=-1;
    if(this.opslist)
    {
        if(this.opslist.style.display=="block")
        {
            this.opslist.style.display="none"
        }
        else
        {
            this.update();
            this.build(this.options);
            this.view.style.zIndex = ++ComboBox.prototype.COMBOBOXZINDEX
            this.opslist.style.display="block"
        }
    }
    else
    {
        this.update();
        this.build(this.options);
        this.view.style.zIndex = ++ComboBox.prototype.COMBOBOXZINDEX
        this.opslist.style.display="block"
    }
}function ComboBox()
{
    if(arguments.length==0)
    {
        self.status="ComboBox invalid - no name arg"
    }    this.name     = arguments[0];
    this.par      = arguments[1]||document.body
    this.view     = document.createElement("DIV");
    this.view.style.position='absolute';
    this.options  = new Array();
    this.expops   = new Array();
    this.value    = ""    this.build  = ComboBox_build
    this.make   = ComboBox_make;
    this.choose = ComboBox_choose;
    this.add    = ComboBox_add;
    this.toggle = ComboBox_toggle;
    this.update = ComboBox_update;
    this.remove = ComboBox_remove;    this.make()
    this.txtview = this.view.childNodes[0]
    this.valcon  = this.view.childNodes[1]
    
    this.par.appendChild(this.view)    Global_combo_array[Global_combo_array.length]=this;
    if(Global_run_event_hook){ComboBox_init()}
}ComboBox.prototype.COMBOBOXZINDEX = 1000 //change this if you mustfunction ComboBox_init() 
{
if (document.addEventListener) {
document.addEventListener("keyup", ComboBox_handleKey, false );
document.addEventListener("mousedown", ComboBox_mouseDown, false );
}
else if (document.attachEvent) {
document.attachEvent("onkeyup", function () { ComboBox_handleKey(window.event); } );
document.attachEvent("onmousedown", function () { ComboBox_mouseDown(window.event); } );
}

    Global_run_event_hook = false;
}function returnFalse(){return false}function ComboBoxItem(text,value)
{
    this.text  = text;
    this.value = value;
}