javascript实现通过拼音首字母快速选择下拉列表
2024-05-06 14:17:57
供稿：网友
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>下拉列表快速选择</title>
<script type="text/javascript" language="JavaScript">
// 获取拼音首字母
function getPinYin(c) {
execScript("tmp=asc(/""+c+"/")", "vbscript");
tmp = 65536 + tmp;
if(tmp>=45217 && tmp<=45252) return "A";
if(tmp>=45253 && tmp<=45760) return "B";
if(tmp>=45761 && tmp<=46317) return "C";
if(tmp>=46318 && tmp<=46825) return "D";
if(tmp>=46826 && tmp<=47009) return "E";
if(tmp>=47010 && tmp<=47296) return "F";
if((tmp>=47297 && tmp<=47613) || (tmp == 63193)) return "G";
if(tmp>=47614 && tmp<=48118) return "H";
if(tmp>=48119 && tmp<=49061) return "J";
if(tmp>=49062 && tmp<=49323) return "K";
if(tmp>=49324 && tmp<=49895) return "L";
if(tmp>=49896 && tmp<=50370) return "M";
if(tmp>=50371 && tmp<=50613) return "N";
if(tmp>=50614 && tmp<=50621) return "O";
if(tmp>=50622 && tmp<=50905) return "P";
if(tmp>=50906 && tmp<=51386) return "Q";
if(tmp>=51387 && tmp<=51445) return "R";
if(tmp>=51446 && tmp<=52217) return "S";
if(tmp>=52218 && tmp<=52697) return "T";
if(tmp>=52698 && tmp<=52979) return "W";
if(tmp>=52980 && tmp<=53688) return "X";
if(tmp>=53689 && tmp<=54480) return "Y";
if(tmp>=54481 && tmp<=62289) return "Z";
return c.charAt(0);
}
// select helper
SelectHelper = new function() {
// 初始化
this.init = function() {
document.attachEvent("onkeypress", function() {
var elm = event.srcElement;
if (elm.tagName == "SELECT"
&& elm.className.indexOf("SelectHelper") == -1) {
elm.className += "SelectHelper";
elm.attachEvent("onkeypress", SelectHelper.getNextKeyItem);
elm.fireEvent("onkeypress", event);
}
});
}
// 获取选项文本的首字符
function getItemKeyChar(option) {
return option.text.charAt(0).toUpperCase();
}
// 查找并选中匹配的选项
this.getNextKeyItem = function() {
var elm = event.srcElement;
var index = elm.selectedIndex + 1;
do {
if (index == elm.length) index = 0;
if (index == elm.selectedIndex) return false; // 未找到匹配的选项，则退出
} while (key2Char(event.keyCode) != getPinYin(getItemKeyChar(elm.options[index++])));
elm.selectedIndex = index - 1; // 选中匹配的选项
