// JavaScript Document
/* ***************************
将中文转换成UTF-8代码
实际上IE 5.5+,Netscape 6+,Mozilla中已经有了转换函数，
即encodeURIComponent，
但对于低版本的浏览器则需要一下代码。
*/
function utf8(wide) {
  var c, s;
  var enc = "";
  var i = 0;
  while(i<wide.length) {
    c= wide.charCodeAt(i++);
    // handle UTF-16 surrogates
    if (c>=0xDC00 && c<0xE000) continue;
    if (c>=0xD800 && c<0xDC00) {
      if (i>=wide.length) continue;
      s= wide.charCodeAt(i++);
      if (s<0xDC00 || c>=0xDE00) continue;
      c= ((c-0xD800)<<10)+(s-0xDC00)+0x10000;
    }
    // output value
    if (c<0x80) enc += String.fromCharCode(c);
    else if (c<0x800) enc += String.fromCharCode(0xC0+(c>>6),0x80+(c&0x3F));
    else if (c<0x10000) enc += String.fromCharCode(0xE0+(c>>12),0x80+(c>>6&0x3F),0x80+(c&0x3F));
    else enc += String.fromCharCode(0xF0+(c>>18),0x80+(c>>12&0x3F),0x80+(c>>6&0x3F),0x80+(c&0x3F));
  }
  return enc;
}

var hexchars = "0123456789ABCDEF";

function toHex(n) {
  return hexchars.charAt(n>>4)+hexchars.charAt(n & 0xF);
}

var okURIchars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-";

function encodeURIComponentNew(s) {
  var s = utf8(s);
  var c;
  var enc = "";
  for (var i= 0; i<s.length; i++) {
    if (okURIchars.indexOf(s.charAt(i))==-1)
      enc += "％"+toHex(s.charCodeAt(i));
    else
      enc += s.charAt(i);
  }
  return enc;
}

function URLEncode(fld)
{
 //if (fld == "") return false;
 var encodedField = "";
 var s = fld;
 if (typeof encodeURIComponent == "function")
 {
  // Use javascript built-in function
  // IE 5.5+ and Netscape 6+ and Mozilla
  encodedField = encodeURIComponent(s);
 }
 else 
 {
  // Need to mimic the javascript version
  // Netscape 4 and IE 4 and IE 5.0
  encodedField = encodeURIComponentNew(s);
 }
 //alert ("New encoding: " + encodeURIComponentNew(fld) +
 //  "\n           escape(): " + escape(fld));
 return encodedField;
}

//提交前把查询关键字sw转换成UTF-8,并加参数到action中
function submitSwForm()
{
	var keyword = document.getElementById("sw").value;
	if (keyword!="")
	{
		swForm.action = "/queryNewssList.html?nest=true&sw=" + URLEncode(keyword);
		return true;
		//swForm.submit();
	}
	else
	{
		document.getElementById("sw").focus();
		alert("请输入搜索关键字!");		
		return false;	
	}
}