实用的javascript代码大全3

最新推荐文章于 2026-01-07 00:05:42 发布

转载最新推荐文章于 2026-01-07 00:05:42 发布 · 358 阅读

文章标签：

#javascript #function #character #textbox #null #flash

本文介绍了一系列JavaScript编程技巧，包括网页存在性的检查、数据库连接、数据岛的使用、参数获取、可编辑下拉框、光标位置设置等功能实现方法。

//检查网页是否存在

function CheckURL(URL)

{

var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

xmlhttp.Open("GET",URL, false);

try

{

xmlhttp.Send();

var result = xmlhttp.status;

}

catch(e) {return(false); }

if(result==200)

{

return true;

}

xmlhttp = null;

return false;

}

//连接数据库

//用 JavaScript 写服务器端连接数据库的代码示例

var conn = new ActiveXObject("ADODB.Connection");

conn.Open("Provider=SQLOLEDB.1; Data Source=localhost; User ID=sa; "

+"Password=; Initial Catalog=pubs");

var rs = new ActiveXObject("ADODB.Recordset");

var sql="select * from authors";

rs.open(sql, conn);

shtml = "<table width='100%' border=1>";

shtml +="<tr bgcolor='#f4f4f4'><td>au_id</td><td>au_lname</td><td>au_fname</td><td>phone</td><td>address</td><td> city</td><td>state</td><td>zip</td></tr>";

while(!rs.EOF)

{

shtml += "<tr><td>" + rs("au_id") + "</td><td>" + rs("au_lname") + "</td><td>" + rs("au_fname") + "</td><td>" + rs("phone") + "</td><td>" + rs("address") + "</td><td>" + rs("city") + "</td><td>" + rs("state") + "</td><td>" + rs("zip") + "</td></tr>";

rs.moveNext;

}

shtml += "</table>";

document.write(shtml);

rs.close();

rs = null;

conn.close();

conn = null;

</script>

//使用数据岛

<html>

<body>

srno：<input type=text datasrc=#xmldate DataFLD=srno size="76"><BR>

times：<input type=text datasrc=#xmldate DataFLD=times size="76"><BR>

<input id="next" TYPE=button value="下一条记录>" onclick="xmldate.recordset.moveNext()">

<input id="last" TYPE=button value="最后一条记录>>" onclick="xmldate.recordset.moveLast()">

</infolist>

</XML>

</body>

</html>

//获得参数

<body>

<a href="javascript:location.href=location.href + '?a=1&b=2'">search</a>

<!--

var a = location.search.substr(1);

if(a.length>0)

{

var re = /([^&]*?)=([^&]*)/g

var s = a.match(re);

for(var i= 0;i<s.length;i++)

{

alert(s);

alert(s.split("=")[1]);

}

//-->

</script>

</body>

//可编辑SELECT

</select>

</span>

//设置光标位置

function getCaret(textbox)

{

var control = document.activeElement;

textbox.focus();

var rang = document.selection.createRange();

rang.setEndPoint("StartToStart",textbox.createTextRange())

control.focus();

return rang.text.length;

}

function setCaret(textbox,pos)

{

try

{

var r =textbox.createTextRange();

r.moveStart('character',pos);

r.collapse(true);

r.select();

}

catch(e)

{}

}

function selectLength(textbox,start,len)

{

try

{

var r =textbox.createTextRange();

r.moveEnd('character',len-(textbox.value.length-start));

r.moveStart('character',start);

r.select();

}

catch(e)

{//alert(e.description)}

}

function insertAtCaret(textbox,text)

{

textbox.focus();

document.selection.createRange().text = text;

}

//页内查找

function findInPage(str)

{

var txt, i, found,n = 0;

if (str == "")

{

return false;

}

txt = 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。请试着输入页面中的关键字再次查找！");

}

return false;

}

//操作EXECL

function jStartExcel() {

var xls = new ActiveXObject ( "Excel.Application" );

xls.visible = true;

var newBook = xls.Workbooks.Add;

newBook.Worksheets.Add;

newBook.Worksheets(1).Activate;

xls.ActiveWorkBook.ActiveSheet.PageSetup.Orientation = 2;

xls.ActiveWorkBook.ActiveSheet.PageSetup.PaperSize = 5;

newBook.Worksheets(1).Columns("A").columnwidth=50;

newBook.Worksheets(1).Columns("A").WrapText = true;

newBook.Worksheets(1).Columns("B").columnwidth=50;

newBook.Worksheets(1).Columns("B").WrapText = true;

newBook.Worksheets(1).Range("A1:B1000").NumberFormat = "0";

newBook.Worksheets(1).Range("A1:B1000").HorizontalAlignment = -4131;

newBook.Worksheets(1).Cells(1,1).Interior.ColorIndex="15";

newBook.Worksheets(1).Cells(1,1).value="First Column, First Cell";

newBook.Worksheets(1).Cells(2,1).value="First Column, Second Cell";

newBook.Worksheets(1).Cells(1,2).value="Second Column, First Cell";

newBook.Worksheets(1).Cells(2,2).value="Second Column, Second Cell";

newBook.Worksheets(1).Name="My First WorkSheet";

}

</script>

//自定义提示条

//***********默认设置定义.*********************

tPopWait=50;//停留tWait豪秒后显示提示。

tPopShow=5000;//显示tShow豪秒后关闭提示

showPopStep=20;

popOpacity=99;

//***************内部变量定义*****************

sPop=null;

curShow=null;

tFadeOut=null;

tFadeIn=null;

tFadeWaiting=null;

document.write("<style type='text/css'id='defaultPopStyle'>");

document.write(".cPopText { background-color: #F8F8F5;color:#000000; border: 1px #000000 solid;font-color: font-size: 12px; padding-right: 4px; padding-left: 4px; height: 20px; padding-top: 2px; padding-bottom: 2px; filter: Alpha(Opacity=0)}");

document.write("</style>");

document.write("<div id='dypopLayer' style='position:absolute;z-index:1000;' class='cPopText'></div>");

function showPopupText(){

var o=event.srcElement;

MouseX=event.x;

MouseY=event.y;

if(o.alt!=null && o.alt!=""){o.dypop=o.alt;o.alt=""};

if(o.title!=null && o.title!=""){o.dypop=o.title;o.title=""};

if(o.dypop!=sPop) {

sPop=o.dypop;

clearTimeout(curShow);

clearTimeout(tFadeOut);

clearTimeout(tFadeIn);

clearTimeout(tFadeWaiting);

if(sPop==null || sPop=="") {

dypopLayer.innerHTML="";

dypopLayer.style.filter="Alpha()";

dypopLayer.filters.Alpha.opacity=0;

}

else {

if(o.dyclass!=null) popStyle=o.dyclass

else popStyle="cPopText";

curShow=setTimeout("showIt()",tPopWait);

}

function showIt(){

dypopLayer.className=popStyle;

dypopLayer.innerHTML=sPop;

popWidth=dypopLayer.clientWidth;

popHeight=dypopLayer.clientHeight;

if(MouseX+12+popWidth>document.body.clientWidth) popLeftAdjust=-popWidth-24

else popLeftAdjust=0;

if(MouseY+12+popHeight>document.body.clientHeight) popTopAdjust=-popHeight-24

else popTopAdjust=0;

dypopLayer.style.left=MouseX+12+document.body.scrollLeft+popLeftAdjust;

dypopLayer.style.top=MouseY+12+document.body.scrollTop+popTopAdjust;

dypopLayer.style.filter="Alpha(Opacity=0)";

fadeOut();

}

function fadeOut(){

if(dypopLayer.filters.Alpha.opacity<popOpacity) {

dypopLayer.filters.Alpha.opacity+=showPopStep;

tFadeOut=setTimeout("fadeOut()",1);

}

else {

dypopLayer.filters.Alpha.opacity=popOpacity;

tFadeWaiting=setTimeout("fadeIn()",tPopShow);

}

function fadeIn(){

if(dypopLayer.filters.Alpha.opacity>0) {

dypopLayer.filters.Alpha.opacity-=1;

tFadeIn=setTimeout("fadeIn()",1);

}

document.onmouseover=showPopupText;

</script>

//插入文字

document.onclick =function(){

var oSource = window.event.srcElement;

if(oSource.tagName!="DIV")

return false;

var sel = document.selection;

if (sel!=null) {

var rng = sel.createRange();

if (rng!=null)

rng.pasteHTML("<font color=red>插入文字</font>");

}

//netscapte下操作xml

doc = new ActiveXObject("Msxml2.DOMDocument");

doc = new ActiveXObject("Microsoft.XMLDOM")

->>

doc = (new DOMParser()).parseFromString(sXML,'text/xml')

//禁止FSO

1.注销组件

regsvr32 /u scrrun.dll

2.修改PROGID

HKEY_CLASSES_ROOTScripting.FileSystemObject

Scripting.FileSystemObject

3.对于使用object的用户，修改HKEY_CLASSES_ROOTScripting.

//省略号

<DIV STYLE="width: 120px; height: 50px; border: 1px solid blue;

overflow: hidden; text-overflow:ellipsis">

<NOBR>就是比如有一行文字，很长，表格内一行显示不下.</NOBR>

</DIV>

//判断键值

<html>

<head>

var ie =navigator.appName=="Microsoft Internet Explorer"?true:false;

function keyDown(e)

{

if(!ie)

{

var nkey=e.which;

var iekey='现在是ns浏览器';

var realkey=String.fromCharCode(e.which);

}

if(ie)

{

var iekey=event.keyCode;

var nkey='现在是ie浏览器';

var realkey=String.fromCharCode(event.keyCode);

if(event.keyCode==32){realkey='' 空格''}

if(event.keyCode==13){realkey='' 回车''}

if(event.keyCode==27){realkey='' Esc''}

if(event.keyCode==16){realkey='' Shift''}

if(event.keyCode==17){realkey='' Ctrl''}

if(event.keyCode==18){realkey='' Alt''}

}

alert('ns浏览器中键值:'+nkey+' '+'ie浏览器中键值:'+iekey+' '+'实际键为'+realkey);

}

document.onkeydown = keyDown;

</script>

</head>

<body>

//Javascript Document.

<hr>

<h3>请按任意一个键。。。。</h3>

</center>

</body>

</html>

//检测media play版本

<IE:clientCaps ID="oClientCaps" style="{behavior:url(#default#clientcaps)}" />

var flash="";

WMPVersion= oClientCaps.getComponentVersion("{22D6F312-B0F6-11D0-94AB-0080C74C7E95}","ComponentID");

if (WMPVersion != "") {

flash = "";

var version = WMPVersion.split(",");

var i;

for (i = 0; i < version.length; i++) {

if (i != 0)

flash += ".";

flash += version;

}

document.write("您的Windows Media Player 版本是:"+flash+"<p>");

}

</SCRIPT>

//图象按比例

<!--

//图片按比例缩放

var flag=false;

function DrawImage(ImgD){

var image=new Image();

var iwidth = 80; //定义允许图片宽度

var iheight = 80; //定义允许图片高度

image.src=ImgD.src;

if(image.width>0 && image.height>0){

flag=true;

if(image.width/image.height>= iwidth/iheight){

if(image.width>iwidth){

ImgD.width=iwidth;

ImgD.height=(image.height*iwidth)/image.width;

}else{

ImgD.width=image.width;

ImgD.height=image.height;

}

ImgD.alt=image.width+"×"+image.height;

}

else{

if(image.height>iheight){

ImgD.height=iheight;

ImgD.width=(image.width*iheight)/image.height;

}else{

ImgD.width=image.width;

ImgD.height=image.height;

}

ImgD.alt=image.width+"×"+image.height;

}

//-->

</script>