JS+CSS实现网页字符查找与定位功能

JS+CSS实现网页字符查找与定位功能

本文详细介绍了一种利用JavaScript和CSS技术模拟浏览器原生网页字符查找功能的具体实现方案。该方案旨在为开发者提供一个可参考的实例，帮助理解前端交互与DOM操作的结合应用。

<html>
<head>
<title>JS+CSS模仿的网页字符查找功能</title>
<style type=text/css>
BODY {
FONT-SIZE: 12px; LETTER-SPACING: 1pt; LINE-HEIGHT: 22px; MARGIN-LEFT: 5pt; MARGIN-TOP: 5pt
} 
#scontentmain {
HEIGHT: 30px; POSITION: absolute; TOP: 28px; WIDTH: 228px
} 
#scontentbar {
BORDER-BOTTOM: black 1px solid; BORDER-LEFT: black 1px solid; BORDER-RIGHT: black 1px solid; BORDER-TOP: black 1px solid; CURSOR: hand; HEIGHT: 15px; PADDING-BOTTOM: 1px; PADDING-LEFT: 1px; PADDING-RIGHT: 1px; PADDING-TOP: 1px; POSITION: absolute; TOP: 5px; WIDTH: 100%
} 
#scontentsub {
POSITION: absolute; TOP: 28px; WIDTH: 100%
} 
A.a1:hover {
BORDER-BOTTOM: #4a8ff2 1px solid; BORDER-LEFT: #4a8ff2 1px solid; BORDER-RIGHT: #4a8ff2 1px solid; BORDER-TOP: #4a8ff2 1px solid; LINE-HEIGHT: 13pt; WIDTH: 83px; 12px;: 1869FE; align: center
} 
A.a1:link {
COLOR: #ffffff; TEXT-DECORATION: none; 12px;align: center
} 
TD {
FONT-SIZE: 12px
} 
.pos {
POSITION: relative
} 
</style>
</head>
<body>
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<SCRIPT language=JavaScript>
var dragapproved=false
var zcor,xcor,ycor
function drag_onclick() {
if (search1.drag.checked == true ) dragapproved=false
else dragapproved=true
} 
function movescontentmain(){
if (event.button==1&&dragapproved&&search1.drag.checked == true){
zcor.style.pixelLeft=tempvar1+event.clientX-xcor
zcor.style.pixelTop=tempvar2+event.clientY-ycor
leftpos=document.all.scontentmain.style.pixelLeft-document.body.scrollLeft
toppos=document.all.scontentmain.style.pixelTop-document.body.scrollTop
return false
} 
} 
function dragscontentmain(){
if (!document.all)
return
if (event.srcElement.id=="scontentbar"){
dragapproved=true
zcor=scontentmain
tempvar1=zcor.style.pixelLeft
tempvar2=zcor.style.pixelTop
xcor=event.clientX
ycor=event.clientY
document.onmousemove=movescontentmain
} 
} 
document.onmousedown=dragscontentmain
document.onmouseup=new Function("dragapproved=false")
function aa(e)
{ 
if (e==0) alert("\n- = 页面搜索引擎 1.0 = \n\n\n- 重写了部分代码\n- 修正鼠标拖动跳跃的bug，\n- 保留选择可否拖动……");
return;
} 
function cose()
{ 
if(confirm("即将关闭此窗口，如确认请按确定！\n\n如要重开此窗口请刷新页面。"))
scontentmain.style.display='none'
else
scontentmain.style.display=''
} 
document.write('<div id="scontentmain"><form name="search1" onSubmit="return findInPage(this.Word.value);"><div id="scontentbar">点击下面复选框，按住此处拖动</div><div id="scontentsub"" style="visibility: show"><table width="228" border="1" cellpadding="2" cellspacing="0" bordercolorlight="#000000" bordercolordark="#FFFFFF" bgcolor="#0099CC" class=font1><tr bgcolor="#2D96FF"><td height="2" colspan="2" align="center"><input type="text" name="Word" size="30" onChange="n = 0;" onFocus=window.document.search1.Word.value="" style="background-image: url()" ></td></tr><tr bgcolor="#CCCCCC"><td width="222"> <input type="checkbox" name="drag" value="搜索" LANGUAGE=javascript onclick="return drag_onclick()">可用鼠标拖动窗口 <a href="#top"></a></td><td width="61" align="center"><input type="submit" name="Submit" value="搜索"></td></tr></form></table></div></DIV>');
var w=document.body.clientWidth-450
var h=190
w+=document.body.scrollLeft
h+=document.body.scrollTop
var leftpos=w
var toppos=h
scontentmain.style.left=w
scontentmain.style.top=h
function ondisplay(){
if (scontentsub.style.display=='')
scontentsub.style.display='none'
else
scontentsub.style.display==''
} 
function offdisplay(){
if (scontentsub.style.display=='none')
scontentsub.style.display=''
else
scontentsub.style.display=='none'
} 
function staticize(){
w2=document.body.scrollLeft+leftpos
h2=document.body.scrollTop+toppos
scontentmain.style.left=w2
scontentmain.style.top=h2
} 
window.onscroll=staticize
function GetWord()
{ 
var tr
} 
function FindWord(w)
{ 
for (var i=0;i<WordList.options.length;i++)
if (WordList.options[i].text==w)
{ 
WordList.options[i].selected=true
Output.value=WordExpln[i]
RESULT.style.visibility="visible"
return true
} 
return false
} 
var canDrag=0,canGetWord=0
var oldtop=0,oldscrolltop=0
var WordExpln=new Array()
var G_xmlHTTP
document.onmousemove = GetWord
var NS4 = (document.layers);
var IE4 = (document.all);
var win = this;
var n = 0;
function findInPage(str)
{ 
var txt, i, found;
if (str == "")
return false;
if (NS4)
{ 
if (!win.find(str))
while(win.find(str, false, true))
n++;
else
n++;
if (n == 0) alert(str + " ... 您要找的文字不存在。\n \n请试着输入页面中的关键字再次查找！\n \n 并且请注意，不要把“？”或“：”也输入查找！！！");
} 
if (IE4)
{ 
txt = win.document.body.createTextRange();
for (i = 0; i <= n && (found = txt.findText(str)) != false; i++)
{ 
txt.moveStart("character", 1);
txt.moveEnd("textedit");
} 
if (found)
{ 
txt.moveStart("character", -1);
txt.findText(str);
txt.select();
txt.scrollIntoView();
n++; }
else
{ 
if (n > 0)
{ 
n = 0;
findInPage(str);
} 
else
alert(str + "... 您要找的文字不存在。\n \n请试着输入页面中的关键字再次查找！\n \n 并且请注意，不要把“？”或“：”也输入查找！！！");
} 
} 
return false;
} 
self.onError=null;
currentX = currentY = 0;
whichIt = null;
lastScrollX = 0; lastScrollY = 0;
NS = (document.layers) ? 1 : 0;
IE = (document.all) ? 1: 0;
</SCRIPT>
</body>
</html>

希望本文所述的代码示例能对从事JavaScript程序设计的人员提供有益的参考与帮助。