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  • Page 1 of 11
    Forum » HTML Codes » Background changing color effect » Background changing color effect
    Background changing color effect
    faxuhiDate: Monday, 07.25.2011, 5:03 PM | Message # 1
    Colonel
    Group: Administrators
    Messages: 189
    Reputation: 0
    Status: Offline
    Code
    <script>

    // Select fade-effect below:
    // Set 1 if the background may fade from dark to medium  
    // Set 2 if the background may fade from light to medium  
    // Set 3 if the background may fade from very dark to very light light
    // Set 4 if the background may fade from light to very light
    // Set 5 if the background may fade from dark to very dark  
    var fade_effect=3

    // What type of gradient should be applied Internet Explorer 5x or higher?
    // Set "none" or "horizontal" or "vertical"
    var gradient_effect="horizontal"

    // Speed higher=slower
    var speed=60

    ///////////////////////////////////////////////////////////////////////////
    // CONFIGURATION ENDS HERE
    ///////////////////////////////////////////////////////////////////////////

    var browserinfos=navigator.userAgent  
    var ie4=document.all&&!document.getElementById
    var ie5=document.all&&document.getElementById&&!browserinfos.match(/Opera/)
    var ns4=document.layers
    var ns6=document.getElementById&&!document.all
    var opera=browserinfos.match(/Opera/)   
    var browserok=ie4||ie5||ns4||ns6||opera

    if (fade_effect==1) {
      var darkmax=1
      var lightmax=127
    }
    if (fade_effect==2) {
      var darkmax=127
      var lightmax=254
    }
    if (fade_effect==3) {
      var darkmax=1
      var lightmax=254
    }
    if (fade_effect==4) {
      var darkmax=190
      var lightmax=254
    }
    if (fade_effect==5) {
      var darkmax=1
      var lightmax=80
    }
    var hexc = new Array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F')

    var newred
    var newgreen
    var newblue
    var oldred
    var oldgreen
    var oldblue

    var redcol_1
    var redcol_2  
    var greencol_1  
    var greencol_2  
    var bluecol_1  
    var bluecol_2  
    var oldcolor
    var newcolor
    var firsttime=true
       
    var stepred=1
    var stepgreen=1
    var stepblue=1

    function setrandomcolor() {
      var range=(lightmax-darkmax)
      if (firsttime) {
       newred=Math.ceil(range*Math.random())+darkmax
       newgreen=Math.ceil(range*Math.random())+darkmax
       newblue=Math.ceil(range*Math.random())+darkmax
       firsttime=false
      }
       
      oldred=Math.ceil(range*Math.random())+darkmax
      oldgreen=Math.ceil(range*Math.random())+darkmax
      oldblue=Math.ceil(range*Math.random())+darkmax
       
      stepred=newred-oldred
      if (oldred>newred) {stepred=1}
      else if (oldred<newred) {stepred=-1}
      else {stepred=0}
       
      stepgreen=newgreen-oldgreen
      if (oldgreen>newgreen) {stepgreen=1}
      else if (oldgreen<newgreen) {stepgreen=-1}
      else {stepgreen=0}
       
      stepblue=newblue-oldblue
      if (oldblue>newblue) {stepblue=1}
      else if (oldblue<newblue) {stepblue=-1}
      else {stepblue=0}
      fadebg()
    }

    function fadebg() {
      if (newred==oldred) {stepred=0}
      if (newgreen==oldgreen) {stepgreen=0}
      if (newblue==oldblue) {stepblue=0}
      newred+=stepred
      newgreen+=stepgreen
      newblue+=stepblue
       
      if (stepred!=0 || stepgreen!=0 || stepblue!=0) {
            redcol_1 = hexc[Math.floor(newred/16)];
           redcol_2 = hexc[newred%16];
        greencol_1 = hexc[Math.floor(newgreen/16)];
            greencol_2 = hexc[newgreen%16];
         bluecol_1 = hexc[Math.floor(newblue/16)];
            bluecol_2 = hexc[newblue%16];
         newcolor="#"+redcol_1+redcol_2+greencol_1+greencol_2+bluecol_1+bluecol_2
       if (ie5 && gradient_effect!="none") {
        if (gradient_effect=="horizontal") {gradient_effect=1}
        if (gradient_effect=="vertical") {gradient_effect=0}
             greencol_1 = hexc[Math.floor(newred/16)];
            greencol_2 = hexc[newred%16];
         bluecol_1 = hexc[Math.floor(newgreen/16)];
             bluecol_2 = hexc[newgreen%16];
          redcol_1 = hexc[Math.floor(newblue/16)];
             redcol_2 = hexc[newblue%16];
        var newcolorCompl="#"+redcol_1+redcol_2+greencol_1+greencol_2+bluecol_1+bluecol_2
        document.body.style.filter=
    "progid:DXImageTransform.Microsoft.Gradient(startColorstr="+newcolorCompl+", endColorstr="+newcolor+" GradientType="+gradient_effect+")"
       }
       else {
          document.bgColor=newcolor  
       }
       var timer=setTimeout("fadebg()",speed);
         }  
        else {
         clearTimeout(timer)
       newred=oldred
       newgreen=oldgreen
       newblue=oldblue
       oldcolor=newcolor
       setrandomcolor()
        }
    }

    if (browserok) {
      window.onload=setrandomcolor
    }
    </script>
     
    Forum » HTML Codes » Background changing color effect » Background changing color effect
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