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网页图片处理JS代码整理

本帖由 365dn 于 2006-01-04 发布。版面名称：前端开发

  1. 365dn

    365dn New Member

    注册:
    2006-01-04
    帖子:
    123
    赞:
    9
    1，掉链级图片的替代图片
    代码:
    <img src="no.jpg" onerror="this.src='images/logo.gif'">
    2.自动缩小大图　　7，检测一个图片的长宽尺寸
    代码:
    <script>
var img=null;
function s()
{
if(img)img.removeNode(true);
img=document.createElement("img");
img.style.position="absolute";
img.style.visibility="hidden";
img.attachEvent("onreadystatechange",orsc);
img.attachEvent("onerror",oe);
document.body.insertAdjacentElement("beforeend",img);
img.src=inp.value;
}
function oe()
{
alert("cant load img");
}
function orsc()
{
if(img.readyState!="complete")return false;
alert("高:"+img.offsetHeight+"n宽:"+img.offsetWidth);
}
</script>
<input type="file" Name="file" id="inp" value="默认值"><br><input onclick="s()" type="button" value="点我一下给出要上传图片的大小及长、宽" name="button">
    3.按比例缩小
    代码:
    <script defer>
for (var i=0;i<document.images.length;i++){
document.images.width=document.images.width*0.5
}
</script>
<img src="img/wallpaper.jpg">

    4.类似Acdsee看大图的时的拖动
    代码:
    <html>
<head>
<title>Untitled    Document</title>
<meta    http-equiv="Content-Type"    content="text/html;    charset=gb2312">

<script    language="JavaScript">
<!--
var    scrollcount=0;
var    dragy;
var    scrollarrowtop;

function    initdrag()    {
scrollcount=1;
dragy=event.clientY;
document.body.setCapture();
}

function    startdrag()    {
if    (scrollcount==1)    {
window.scrollBy(dragy-event.clientX,dragy-event.clientY);
document.body.style.cursor='hand';
dragy=event.clientY;
}
}
function    enddrag()    {
document.body.style.cursor='';
scrollcount=0;
document.body.releaseCapture();
}
//    -->
</script>
</head>

<body    bgcolor="#FFFFFF"    text="#000000"    onselectstart="return    false;"    onmousedown="initdrag()"    onmousemove="startdrag()"    onmouseup="enddrag()"    scroll=yes>

<img        src="img/wallpaper.jpg">    
<img        src="img/whitney.jpg">

</body>
</html>
    5.选择图片产生缩略图，最多10个
    代码:
    <html>
<head>
<title>Upload Image</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<SCRIPT language=Javascript>
gFlag=false;
var gMaxSize,gCurrentSize,gUploadSize,gCurInputIndex,gCurImageSrc,gCurOFile;
gMaxSize="10";
gCurrentSize=".18";
gMaxSize=parseFloat(gMaxSize)*1024*1024;
//gMaxSize=parseFloat("1")*1024;
gCurrentSize=parseFloat(gCurrentSize)*1024*1024;
gErr="";
gUploadSize=0;
////////////////////////////////////////////////////
      function validate()
      {
      var lErr;
      lErr="";
          if((gUploadSize+gCurrentSize)>gMaxSize){
             if(form1.TempAlbum.value!=form1.OldAlbum.value){
                lErr=".您要上传的图片尺寸大于您的剩余相册容量,请选择上传至"临时相册"n"+lErr;
                }
            }
      
          if(form1.OldAlbum.value=="0"){
             if(form1.NewAlbum.value.length==0){
                lErr=".请输入新相册名称n"+lErr;
             }
           }
           if(lErr.length>0){
              alert("错误:n"+lErr);
              if(lErr.indexOf("请输入新相册名称nn")!=-1){
                  form1.NewAlbum.focus();
              }
              return false;
              }
             
              
            form1.submit();
            /*进度条控制*/
            //var winProgress=window.open("progress.htm","progress","width=300,height=250");
            //winProgress.focus();
            /*进度条控制*/
            
            return true;
       }
      
    function handleBadImage() {
        alert('所选图片并非有效的JPG格式!n请重新选择!');
        eval("form1.file"+gCurInputIndex+".outerHTML="<input type="file" name="file"+gCurInputIndex+"" style="width:275"  value="" onChange="FileChange(this);">"");
        eval("form1.file"+gCurInputIndex+".fireEvent("onChange")");

        return false;
    }
     
    function handleGoodImage() {
        imgsrc='<img src="'+gCurImageSrc+'" onload="DrawImage(this,'+gCurInputIndex+'); " width="0" height="0">';
        gCurOFile.parentNode.previousSibling.innerHTML=imgsrc;
        return true;
    }
    //////////////////////////////////////////  
      function FileChange(oFile){
        gErr="";
        gUploadSize=0;
        str='';
        gCurOFile=oFile;
        gCurImageSrc=oFile.value;
        inputname=oFile.name;
        i=inputname.substr((inputname.length-1),1);
        gCurInputIndex=i;
        
      if (gCurImageSrc.length>0){
            //check for none jpg
            imgExt=new Image();
            imgExt.onload=handleGoodImage;
            imgExt.onerror=handleBadImage;
            var fileName = gCurImageSrc.replace("", "/"); // NN7
            var imgURL = 'file:///' + fileName;
            
            if((navigator.appVersion.indexOf('Mac')>-1) && (navigator.appVersion.indexOf('MSIE')>-1)){
                imgURL='file://' + fileName;
            }
            imgExt.src=imgURL;
            //finish check
          
          }
      
      }
      
      function ShowImgOfServer(NewPath,ImgD){
      ImgD.src=NewPath;
      }
      
    /////////////////////////////////////  
    function DrawImage(ImgD,Index){
    var flag=false;
       var image=new Image();
       image.src=ImgD.src;
       ImgD.value=ImgD.src;
       if(image.fileSize>2048000){
          image.outerHTML="";
          gErr+="此图片尺寸过大,图片尺寸应小于2MBn";
          eval("form1.file"+Index+".outerHTML="<input type="file" name="file"+Index+"" style="width:275"  value="" onChange="FileChange(this);">"");
          eval("form1.file"+Index+".fireEvent("onChange")");
          alert("此图片尺寸过大,图片尺寸应小于2MBn");
          return ;
          }
       if(image.src.substr(image.src.length-3,3).toLowerCase()!="jpg"){
          image.outerHTML="";
          gErr+="此图片类型不匹配,只能上传JPG(JPEG)格式文件n";
          eval("form1.file"+Index+".outerHTML="<input type="file" name="file"+Index+"" style="width:275"  value="" onChange="FileChange(this);">"");
          eval("form1.file"+Index+".fireEvent("onChange")");
          alert("此图片类型不匹配,只能上传JPG(JPEG)格式文件n");
          return ;
          }
          tempFileName=image.src;
          var iLastDot;
          iLastLine=tempFileName.lastIndexOf('/');
          if(iLastLine!=-1){
              tempFileName=tempFileName.substring(iLastLine+1,tempFileName.length);
          }
       if(!CheckIfEnglish(tempFileName)){
          image.outerHTML="";
          gErr+="此图片文件名包含中文或其他不合法字符n文件名只能由'a-z'、'A-Z'、'_'、'-'构成n";
          eval("form1.file"+Index+".outerHTML="<input type="file" name="file"+Index+"" style="width:275"  value="" onChange="FileChange(this);">"");
          eval("form1.file"+Index+".fireEvent("onChange")");
          alert("此图片文件名包含中文或其他不合法字符n文件名只能由'a-z'、'A-Z'、'_'、'-'构成n");
          return ;
       }

       if(gErr.length>0){
          return;
          }
       if(image.width>0 && image.height>0){
        flag=true;
        if(image.width/image.height>= 120/80){
         if(image.width>120){  
         ImgD.width=120;
         ImgD.height=(image.height*120)/image.width;
         }else{
         ImgD.width=image.width;  
         ImgD.height=image.height;
         }
         ImgD.alt="图片大小(宽*高): "+image.width+"×"+image.height+"n图片大小: "+image.fileSize+"n图片路径: "+image.src;
         eval('document.all.width'+Index+'.value='+image.width);
         eval('document.all.height'+Index+'.value='+image.height);
         var oCreated=new Date(image.fileModifiedDate);
         eval('document.all.PicUpdateDate'+Index+'.value="'+oCreated.toLocaleString()+'"');
         }
        else{
         if(image.height>80){  
         ImgD.height=80;
         ImgD.width=(image.width*80)/image.height;     
         }else{
         ImgD.width=image.width;  
         ImgD.height=image.height;
         }
         ImgD.alt="图片大小(宽*高): "+image.width+"×"+image.height+"n图片大小: "+image.fileSize+"n图片路径: "+image.src;
         eval('document.all.width'+Index+'.value='+image.width);
         eval('document.all.height'+Index+'.value='+image.height);
         var oCreated=new Date(image.fileModifiedDate);
         
         eval('document.all.PicUpdateDate'+Index+'.value="'+oCreated.toLocaleString()+'"');
         }
         
        }
                
          if(parseInt(Index)==parseInt(form1.upcount.value)){
                form1.upcount.value=parseInt(form1.upcount.value)+1;
                str+='<table width="100%" ><tr valign="middle" ><td align="center" id="tdimg" height="" width="120" ></td><td id="tdfile" >文件'+(parseInt(Index)+1)+':<input onpropertychange="FileChange(this);" type="file" name="file'+(parseInt(Index)+1)+'" style="width:275" ><input id="width'+(parseInt(Index)+1)+'" name="width'+(parseInt(Index)+1)+'"  type="hidden" value=""><input id="height'+(parseInt(Index)+1)+'" name="height'+(parseInt(Index)+1)+'"  type="hidden" value=""><input name="PicUpdateDate'+(parseInt(Index)+1)+'" type="hidden" id="PicUpdateDate'+(parseInt(Index)+1)+'"></td></tr></table>';
                window.upid.insertAdjacentHTML("beforeEnd",str+'<br>');
            }

          gUploadSize+=parseFloat(image.fileSize);
           } 
    //////////////////////////////////////////  
      function AlbumChange(Value){
        if(Value=='0'){
        document.all.sNewAlbum.style.display='inline';
        document.all.NewAlbum.focus();
        }
        else{
        document.all.sNewAlbum.style.display='none';
        }
        return ;
      }
      
      
function CheckIfEnglish( String )
{ 
    var Letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890-_.";
     var i;
     var c;
      if(String.charAt( 0 )=='-')
    return false;
      if( String.charAt( String.length - 1 ) == '-' )
          return false;
     for( i = 0; i < String.length; i ++ )
     {
          c = String.charAt( i );
      if (Letters.indexOf( c ) < 0)
         return false;
     }
     return true;
}
</SCRIPT>
</head>
<body >
<form name="form1" method="post" action="">
  <TABLE align=center bgColor=#cccccc border=0 
                                borderColorDark=#cccccc borderColorLight=#000000 
                                cellPadding=5 cellSpacing=1 height=367 
                                width="500">
    <TBODY>
      <TR vAlign=center> 
        <TD align=left bgColor=#ffffff colSpan=2 
                                height=269 id=upid vAlign=top> <TABLE cellPadding=3 cellSpacing=1 width="100%">
            <TBODY>
              <TR vAlign=center> 
                <TD align=middle bgColor=#ffffff id=tdimg 
                                width=120></TD>
                <TD bgColor=#ffffff id=tdfile>文件1: 
                  <INPUT 
                                name=file1 onpropertychange=FileChange(this); 
                                style="WIDTH: 275px" type=file> <INPUT id=width1 
                                name=width1 type=hidden> <INPUT id=height1 
                                name=height1 type=hidden> <INPUT 
                                id=PicUpdateDate1 name=PicUpdateDate1 
                                type=hidden></TD>
              </TR>
            </TBODY>
          </TABLE></TD>
      </TR>
      <TR bgColor=#eeeeee vAlign=center> 
        <TD align=middle bgColor=#ebebeb colSpan=2 
                                height=24> <DIV align=left>将图片上传至已有相册 
            <SELECT id=OldAlbum 
                                name=OldAlbum onchange=AlbumChange(this.value);>
              <OPTION value=0><新建相册></OPTION>
              <OPTION 
                                selected value=365>临时相册</OPTION>
            </SELECT>
            <INPUT 
                                id=TempAlbum name=TempAlbum type=hidden 
                                value=365>
            <SPAN id=sNewAlbum 
                                style="DISPLAY: none">或新建相册 
            <INPUT id=NewAlbum 
                                maxLength=50 name=NewAlbum onfocus="">
            </SPAN></DIV></TD>
      </TR>
      <TR bgColor=#eeeeee vAlign=center> 
        <TD align=middle bgColor=#ebebeb colSpan=2 
                                height=24> <DIV align=center><FONT size=2> 
            <INPUT class=bt name=Submit onclick=validate(); type=button value="· 上传已选图片 ·">
            <INPUT id=upcount name=upcount type=hidden 
                                value=1>
            <INPUT id=from name=from type=hidden>
            </FONT></DIV></TD>
      </TR>
    </TBODY>
  </TABLE>
</form>
</body>
</html>
    6.不同的ALT
    代码:
    <SCRIPT language=JavaScript1.2>
<!--
tPopWait=50;
tPopShow=50000;
showPopStep=10;
popOpacity=100;

sPop=null;
curShow=null;
tFadeOut=null;
tFadeIn=null;
tFadeWaiting=null;

document.write("<style type='text/css'id='defaultPopStyle'>");
document.write(".cPopText { background-color: #FFFFFF; border: 1px #000000 solid; 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.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>
<img src="images/logo.gif" alt="网页教学网">
    6.经常看到一些图片很大，上传后显示会撑满屏幕下面的例子通过检测if(this.width>screen.width-350)then(this.width=screen.width-350)如果该图片的宽度大于“屏幕宽度-350”，则让该图就显示“屏幕宽度-350”这么大小。
    代码:
    原图<br>
<img src="jsimg/wallpaper.jpg"><br>
设定大小的图<br>
<img src="jsimg/wallpaper.jpg" onload="javascript:if(this.width>screen.width-350)this.width=screen.width-350">
    7.禁止IE6中大尺寸图片的自动缩小
    代码:
    原图,会自动缩小<br>
<img src="jsimg/wallpaper.jpg"> <br>
设定不缩小<br>
<img src="jsimg/wallpaper.jpg" galleryimg="no">
    8.去掉用IE6.0浏览图片，当鼠标放到图片上时出现快捷工具（打印、邮寄、另存等）
    代码:
    方法一：
<META HTTP-EQUIV="imagetoolbar" CONTENT="no">
方法二：
<img galleryimg="no">
定义CSS：
<style>
img {nobar:expression(this.galleryImg='no')}
</style>
    9.去掉热点地图上的区域线框与超链接的线框
    代码:
    <a href="#" onFocus=this.blur()><img src="jsimg/marylin.jpg" border=0></a>
    10.可控制上传图片的大小
    代码:
    <script language="JavaScript">

function orsc()
{
if(img.readyState!="complete")return false;
if(img.offsetWidth!=132&&img.offsetHeight!=99){
alert("您选择的图片大小："+img.offsetWidth+"X"+img.offsetHeight+"n"+"请选择132X99大小的图片")
imgT=true;
}
//alert("图片大小："+img.offsetWidth+"X"+img.offsetHeight);
//alert("图片尺寸："+img.fileSize);
}
function mysubmit(theform)
{
 if(theform.file1.value=="")
 {
  alert("请点击浏览按钮，选择您要上传的JPG或GIF文件!")
  theform.file1.focus;
  return (false);
 }
 else
 {
  str= theform.file1.value;
  strs=str.toLowerCase();
  lens=strs.length;
  extname=strs.substring(lens-4,lens);
  if(extname!=".jpg" && extname!=".gif")
  {
   alert("请选择JPG或GIF格式的文件!");
   return (false);
  }else{
  document.all("loadImg").src=theform.file1.value
  if(document.all("loadImg").offsetWidth!=132&&document.all("loadImg").offsetHeight!=99){
alert("您选择的图片大小："+document.all("loadImg").offsetWidth+"X"+document.all("loadImg").offsetHeight+"n"+"请选择132X99大小的图片")
return (false)
}
  }
  
 }
 
}
</script>
<form onSubmit="return mysubmit(this)" name="form" method="post"  enctype="multipart/form-data">
<table width="100%" border=0 cellspacing=0 cellpadding=0>
<tr><td valign=top height=30>
<input type="hidden" name="act" value="upload">
        <input type="file" style="BORDER-TOP-WIDTH: 1px; BORDER-LEFT-WIDTH: 1px; FONT-SIZE: 12px; BORDER-BOTTOM-WIDTH: 1px; CURSOR: text; COLOR: #333333; FONT-FAMILY: "MS Shell Dlg", ","Tahoma", ","宋体"; HEIGHT: 20px; BORDER-RIGHT-WIDTH: 1px
" name="file1"  value=""> 
        <input type="submit" name="Submit" value="上传" > 
      </td>
    </tr>
</table>
<img id=loadImg>
</form>
     
    #1 365dn, 2006-01-04
  2. OUYANG

    OUYANG New Member

    注册:
    2005-09-06
    帖子:
    3,025
    赞:
    5
    好的!收了!

    TKS
     
    #2 OUYANG, 2006-01-04
  3. 总代

    总代 New Member

    注册:
    2005-11-10
    帖子:
    4,145
    赞:
    89
    好东西，不错
     
    #3 总代, 2006-01-04
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