一个不复杂的菜单问题等了一个月没等到答案

colee 2002-11-30 01:07:13

现在有一个选择菜单<select..></select>，里面有很多选择值，要选到想找的值很难，有什么方法可以快点选到想选的值呢？
（我想这样：鼠标先点到选择菜单，然后键盘敲入想选的字符<或它的前面几个字符，就会逐渐出现含有敲入字符的值>，但是我不能实现）

在Asp专栏中一个月了都没人帮我解决，希望这里的高手们帮帮手

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qiushuiwuhen 2002-12-04

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<select name="username" onkeydown=spellList() onchange=alert(this[selectedIndex].sp)>
<option>H102452PLFW</option>
<option>H102453PLFW</option>
<option>H102352PLFW</option>
<option>/102354PLFW</option>
<option>h202154PLFW</option>
<option>-102354PLFW</option>
</select>

<script>
var sel="",timer=null,re="";
function spellList(){
/********(qiushuiwuhen 2002-9-20)***********/
with(window.event){
with(srcElement){
if(keyCode<48&&keyCode!=8)return;
if(keyCode>95&&keyCode<106)keyCode-=48
if(keyCode==8)sel=sel.slice(0,-1)
else if(keyCode==189||keyCode==109)sel+="-"
else if(keyCode==191)sel+="/"
//根据自己的需要，增加特殊符号的处理
else sel+=String.fromCharCode(keyCode)
window.status=sel
for(i=0;i<length;i++){
if(options[i].text.toLowerCase().indexOf(sel.toLowerCase())==0){selectedIndex=i;break;}
}
}
returnValue=false;
clearTimeout(timer)
timer=setTimeout("sel=''",2000);//延长时间
}
}
</script>

colee 2002-12-03

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TO freefalcon(心宇)：
为了增加对符号“/”的处理,
我加了 else if(keyCode==191)sel+="/",但是无效

为什么对符号“-”的处理有两个keycode值？
即：else if(keyCode==189||keyCode==109)sel+="-"

顺便请帮忙给出对符号“/”的处理应该怎么写，
就此结束

freefalcon 2002-12-03

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编写如下的一个html页面
<body onkeydown="window.status=(event.keyCode)">
你便可以在状态栏中看见键码了

colee 2002-12-03

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请恕我对Javascript的陌生
我不知道怎么“//根据自己的需要，增加特殊符号的处理”
那些常用字符的keycode是多少，比如“/”的

应该加一个怎样的else if。。。

colee 2002-12-02

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junguo(junguo) ：我把timelimit改大了，但结果反而选不到了，改得小点（我甚至把它设为零）也没什么变化，你程式里面：timer好像等于lasttimer？

秋水兄，你的那个程式只对大写字母和数字有效，可不可以不分大小写，而且对减号等几个非常常用的字符也有效？
另外可不可以控制缓冲时间？

junguo 2002-12-02

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var timelimit=2000;
把这个值改大就好了

qiushuiwuhen 2002-12-02

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同理可做呀，增加了退格键backspace的功能,如果输错，可以退格

<select name="username" onkeydown=spellList() onchange=alert(this[selectedIndex].sp)>
<option>H102452PLFW</option>
<option>H102453PLFW</option>
<option>H102352PLFW</option>
<option>H102354PLFW</option>
</select>

<script>
var sel="",timer=null;
function spellList(){
/********(qiushuiwuhen 2002-9-20)***********/
with(window.event){
with(srcElement){
if(keyCode<48&&keyCode!=8)return;
if(keyCode>95)keyCode-=48
if(keyCode==8)sel=sel.slice(0,-1)
else sel+=String.fromCharCode(keyCode)
window.status=sel
for(i=0;i<length;i++){
if(options[i].text.indexOf(sel)==0){selectedIndex=i;break;}
}
}
returnValue=false;
clearTimeout(timer)
timer=setTimeout("sel=''",1000);
}
}
</script>

colee 2002-12-02

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qiushuiwuhen(秋水无恨) 的这个程式(在ASP专栏里已经回复我了)只对汉字有用。(不过这种思想真的很好，可不可以给我个支持 ‘选择值里只含字母或数字等其他常用字符’ 的脚本)

junguo(junguo)的程式我有两点疑问：
1、必须得非常连续快速正确地输入要选择的值，稍慢一点或不连续都不行。怎么来延长缓冲时间呢？？？
2、假设选择菜单里有个值为："H102452PLFW"，现在要选择它，若敲错了其中一个字符，则会转到这个以这个敲错了的字符为首的值中去，所以必须重新再敲入。

请再关注帮忙，谢谢

bencalie 2002-12-02

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微软的例子，在select获得焦点的情况下，按相应键跳转到相应字母开始的第一个选项

<HTML>
<HEAD>

<SCRIPT language=javascript>
// Auto-select listbox

// mike pope, Visual Basic UE

// This script and the listbox on this page illustrates one
// way to create an "auto-complete" listbox, where the

var toFind = ""; // Variable that acts as keyboard buffer
var timeoutID = ""; // Process id for timer (used when stopping
// the timeout)
timeoutInterval = 250; // Milliseconds. Shorten to cause keyboard
// buffer to be cleared faster
var timeoutCtr = 0; // Initialization of timer count down
var timeoutCtrLimit = 3 ; // Number of times to allow timer to count
// down
var oControl = ""; // Maintains a global reference to the
// control that the user is working with.

function listbox_onkeypress(){
// This function is called when the user presses a key while focus is in
// the listbox. It maintains the keyboard buffer.
// Each time the user presses a key, the timer is restarted.
// First, stop the previous timer; this function will restart it.
window.clearInterval(timeoutID)

// Which control raised the event? We'll need to know which control to
// set the selection in.
oControl = window.event.srcElement;

var keycode = window.event.keyCode;
if(keycode >= 32 ){
// What character did the user type?
var c = String.fromCharCode(keycode);
c = c.toUpperCase();
// Convert it to uppercase so that comparisons don't fail
toFind += c ; // Add to the keyboard buffer
find(); // Search the listbox
timeoutID = window.setInterval("idle()", timeoutInterval);
// Restart the timer
}
}

function listbox_onblur(){
// This function is called when the user leaves the listbox.

window.clearInterval(timeoutID);
resetToFind();
}

function idle(){
// This function is called if the timeout expires. If this is the
// third (by default) time that the idle function has been called,
// it stops the timer and clears the keyboard buffer

timeoutCtr += 1
if(timeoutCtr > timeoutCtrLimit){
resetToFind();
timeoutCtr = 0;
window.clearInterval(timeoutID);
}
}

function resetToFind(){
toFind = ""
}

function find(){
// Walk through the select list looking for a match

var allOptions = document.all.item(oControl.id);

for (i=0; i < allOptions.length; i++){
// Gets the next item from the listbox
nextOptionText = allOptions(i).text.toUpperCase();

// By default, the values in the listbox and as entered by the
// user are strings. This causes a string comparison to be made,
// which is not correct for numbers (1 < 11 < 2).
// The following lines coerce numbers into an (internal) number
// format so that the subsequent comparison is done as a
// number (1 < 2 < 11).

if(!isNaN(nextOptionText) && !isNaN(toFind) ){
nextOptionText *= 1; // coerce into number
toFind *= 1;
}

// Does the next item match exactly what the user typed?
if(toFind == nextOptionText){
// OK, we can stop at this option. Set focus here
oControl.selectedIndex = i;
window.event.returnValue = false;
break;
}

// If the string does not match exactly, find which two entries
// it should be between.
if(i < allOptions.length-1){

// If we are not yet at the last listbox item, see if the
// search string comes between the current entry and the next
// one. If so, place the selection there.

lookAheadOptionText = allOptions(i+1).text.toUpperCase() ;
if( (toFind > nextOptionText) &&
(toFind < lookAheadOptionText) ){
oControl.selectedIndex = i+1;
window.event.cancelBubble = true;
window.event.returnValue = false;
break;
} // if
} // if

else{

// If we are at the end of the entries and the search string
// is still higher than the entries, select the last entry

if(toFind > nextOptionText){
oControl.selectedIndex = allOptions.length-1 // stick it
// at the end
window.event.cancelBubble = true;
window.event.returnValue = false;
break;
} // if
} // else
} // for
} // function
</SCRIPT>
</HEAD>
<BODY>
<P><B>Text</B></P>
<SELECT ID=select1 tabindex=1 width=20 size=7 style="width:125px"
onkeypress="listbox_onkeypress()" onblur="listbox_onblur()">
<OPTION value=2>Abby</OPTION>
<OPTION value=1>Alice</OPTION>
<OPTION value=3>Barry</OPTION>
<OPTION value=3>Beth</OPTION>
<OPTION value=3>Bobby</OPTION>
<OPTION value=3>Catherine</OPTION>
<OPTION value=3>Chuck</OPTION>
<OPTION value=3>Dave</OPTION>
<OPTION value=3>Dick</OPTION>
<OPTION value=3>Dino</OPTION>
<OPTION value=3>Elmer</OPTION>
<OPTION value=3>Emily</OPTION>
<OPTION value=3>Ethel</OPTION>
<OPTION value=3>William</OPTION>
<OPTION value=3>Xerxes</OPTION>
<OPTION value=3>Yolanda</OPTION>
<OPTION value=3>Zachary</OPTION>
</SELECT>
</BODY>
</HTML>

freefalcon 2002-12-02

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<select name="username" onkeydown=spellList() onchange=alert(this[selectedIndex].sp)>
<option>H102452PLFW</option>
<option>H102453PLFW</option>
<option>H102352PLFW</option>
<option>H102354PLFW</option>
<option>h202154PLFW</option>
<option>-102354PLFW</option>
</select>

<script>
var sel="",timer=null,re="";
function spellList(){
/********(qiushuiwuhen 2002-9-20)***********/
with(window.event){
with(srcElement){
if(keyCode<48&&keyCode!=8)return;
if(keyCode>95&&keyCode<106)keyCode-=48
if(keyCode==8)sel=sel.slice(0,-1)
else if(keyCode==189||keyCode==109)sel+="-"
//根据自己的需要，增加特殊符号的处理
else sel+=String.fromCharCode(keyCode)
window.status=sel
re=eval("/"+sel+"/i")
for(i=0;i<length;i++){
if(options[i].text.search(re)==0){selectedIndex=i;break;}
}
}
returnValue=false;
clearTimeout(timer)
timer=setTimeout("sel=''",2000);//延长时间
}
}
</script>

qiushuiwuhen 2002-11-30

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输入名字的首字缩写即可找到，如张三火(zsh)<select name="username" onkeydown=spellList() onchange=alert(this[selectedIndex].sp)>
<option value="ZS" >张三</option>
<option value="ZSH">张三火</option>
<option value="LS">李四</option>
<option value="LSS">李四水</option>
</select>

<script>
var sel="",timer=null;
function spellList(){
/********(qiushuiwuhen 2002-9-20)***********/
with(window.event){
with(srcElement){
if(keyCode<48)return;
if(keyCode>95)keyCode-=48
sel+=String.fromCharCode(keyCode)
window.status=sel
for(i=0;i<length;i++){
if(options[i].value.indexOf(sel)==0){selectedIndex=i;break;}
}
}
returnValue=false;
clearTimeout(timer)
timer=setTimeout("sel=''",500);
}
}
</script>

junguo 2002-11-30

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var strKey;
var lasttimer=Date.parse(Date());
var timelimit=2000;
function onKeyPress()
{
if(strKey==null)
{
strKey="";
}
var length;
var strText;
var timer;
var TheForm;
TheForm=event.srcElement;
timer=Date.parse(Date());
if(timer-lasttimer>timelimit)
{strKey="";}
lasttimer=timer;
strKey=strKey + String.fromCharCode(window.event.keyCode);
length=TheForm.length;
for(i=0;i<length;i++)
{
strText=TheForm.options[i].text;
strText=strText.toLowerCase();
intI=strText.indexOf(strKey);
if (intI==0)
{
TheForm.options[i].selected=true;
window.event.returnValue=false;
return;
}
}
}