📄 ch16-236.txt
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<HTML>
<HEAD>
<TITLE>页面搜索篇--设置搜索引擎</TITLE>
</HEAD>
<BODY bgcolor="#fef4d2" >
<br><br>
<center>
<font color="ffaafa"><h2>页面搜索篇--设置搜索引擎</h2></font>
<hr width=300>
<br>
<!-- 案例代码开始 -->
<form name="database">
<!-- [Step1]: 这里可以按序增加要搜索的网址、名称和关键词 -->
<input type="hidden" name="list" value='http://www.263.net.cn~263 在线|263 mail life china flash news*http://www.sina.com.cn~新 浪 网|sina chat news hotel women friend*http://www.sohu.com~搜 狐 网|sohu news IT education chinaren*'>
</form>
<script language=JavaScript>
string = "";
var arraylen = 0;
var menulen = 0;
var poslen = 0;
var dblen = 0;
var array = new Object();
var position = new Object();
var index = document.database.list.value;
var database = new Database();
var menu = new Object();
if ((index.substring(index.length-2,index.length)).indexOf("*") == -1) index += "* ";
else index += " ";
if (location.search.length > 1) {
string = unescape(location.Search.substring(1,location.Search.length));
pos = 0;
while ((pos = string.indexOf('"',pos)) != -1) {
string = string.substring(0,pos) + '\\"' + string.substring(pos+1,string.length);
pos += 2; }
SearchEngineer(string);
}
function Database() {
var pos = 0;
while ((pos1 = index.indexOf("~",pos)) != -1) {
pos2 = index.indexOf("|",pos1+1);
pos3 = index.indexOf("*",pos2+1);
if ((pos2 != -1)&& (pos2 < pos3) && (pos3 <= index.indexOf("*",pos))) {
this[dblen++] = new UrlNameKey(index.substring(pos,pos1), index.substring(pos1+1,pos2), index.substring(pos2+1,pos3));
pos = pos3+1; } }
return this;
}
function SearchEngineer(str) {
menulen = 0;
temp = new Object();
temp_length = 0;
words_length = 0;
words = new Object();
pos = 0;
while ((pos = str.indexOf(" ")) != -1) {
words[words_length] = str.substring(0,pos);
if (words[words_length].length > 0) words_length++;
if (str.length == 1) str="";
else str = str.substring(pos+1,str.length); }
if (str.length > 0) words[words_length++] = str;
for (q=0;q<words_length;q++) {
temp_length = 0;
str = words[q].toLowerCase();
pattern_string = pattern(str);
start_pos = back_up_pos = 0;
len = (q>0?menulen:dblen);
for (n=0; n<len; n++) {
no_back_up = true;
poslen = 0;
if (q>0) { combo = (menu[n].title + " " + menu[n].keywords).toLowerCase(); }
else { combo = (database[n].title + " " + database[n].keywords).toLowerCase(); }
combo = combo.substring(start_pos,combo.length);
if (eval(pattern_string)) { temp[temp_length++] = (q>0?menu[n]:database[n]); start_pos = 0; }
else if (!no_back_up) { n--; start_pos += back_up_pos+1; }
else { start_pos = 0; } }
if (q>0) { added = 0;
for (i=0;i<temp_length;i++) { duplicate = false;
for (j=0;j<menulen&&!duplicate;j++) { if (menu[j] == temp[i]) { duplicate = true; }}
if (!duplicate) menu[menulen+(added++)] = temp[i]; }
menulen += added; }
else { for(h=0;h<temp_length;h++) menu[h] = temp[h];
menulen = temp_length; } }
}
function pattern(str) {
arraylen = poslen = 0;
while ((str.length > 1) && (str.charAt(0) == "*")) {str = str.substring(1,str.length); }
while ((str.length > 1) && (str.charAt(str.length-1) == "*")) { str = str.substring(0,str.length-1); }
if (str == "*") return "(true)";
if (str.indexOf("*") == -1) { array[arraylen++] = str; pat = "(combo.indexOf(array[0]) != -1)"; }
else { left = right = 0; pat2 = ""; pat = "(((position[0] = combo.indexOf(array[0])) != -1)";
while ((right = str.indexOf("*",left)) != -1) {
array[arraylen++] = str.substring(left,right);
pat += " && (position["+(poslen)+"] < (position[" +(++poslen)+"] = combo.indexOf(array["+(arraylen)+"],position["+(poslen-1)+"]+array["+(arraylen-1)+"].length"+")))";
if (!match_across_word_boundaries)
pat2 = " && (no_back_up = ((back_up_pos += combo.substring(" +"temp_pos = back_up_pos = position[" +(poslen-1)+"]+array["+(arraylen-1)+"].length,position[" + (poslen) + "]).lastIndexOf(' ')) < temp_pos))" + pat2;
left = right+1; }
array[arraylen++] = str.substring(left,str.length);
pat += pat2+")"; }
return pat;
}
function InputKey() {
<!-- [Step2]: 在此能够更改警告框中的信息 -->
if ((document.InputKeyform.keyword.value.length == 0)|| (document.InputKeyform.keyword.value == " ")) {
alert("请输入关键词！");
return false; }
SearchEngineer(document.InputKeyform.keyword.value);
if (menulen == 0) menu[menulen++] = new UrlNameKey("","没有搜索结果","");
document.display.found.options.length = menulen;
for (n=0; n<menulen; n++) {
if (menu[n].title.length <= 50) document.display.found.options[n].text = menu[n].title;
else document.display.found.options[n].text = menu[n].title.substring(0,50);
document.display.found.options[n].value = menu[n].url; }
return false;
}
function UrlNameKey(url,title,keywords) {
while ((url.length > 0) && (url.charAt(0) == " ")) {url = url.substring(1,url.length);}
this.url = url;
while ((title.length > 0) && (title.charAt(0) == " ")) {title = title.substring(1,title.length); }
this.title = title;
this.keywords = keywords;
return this;
}
function LinkUrl() {
sel = document.display.found.selectedIndex;
if ((sel != -1) && (document.display.found.options[sel].value.length > 0))
location.href = document.display.found.options[sel].value;
}
<!-- [Step3]: 这里可以更改文本框的列长度 -->
<!-- [Step4]: 在此能够设置选择框的行数 -->
document.write('<form name="InputKeyform" onSubmit="return InputKey()">'+'关键词： <input type="text" size=15 name="keyword" value="'+string+'"> '+'<input type="button" value="搜 索" onClick="InputKey()"><br></form>' +'<form name="display"><select name="found" size=4 >\n');
for (n=0; n<menulen; n++) document.write('<option value="'+menu[n].url+'">'+menu[n].title+'\n');
<!-- [Step5]: 这里可以更改选择框中的默认值 -->
if ((menulen == 0) && (location.search.length <= 1)) document.write('<option value="" >网站列表\n');
document.write('</select><br><input type="button" onClick="LinkUrl()" '+'value="登 陆"></form>');
</script>
<!-- 案例代码结束 -->
</BODY>
</HTML>
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