Changing background image with a button

**hankthetank** · 09-13-2010, 07:04 PM

I am trying to make a button that would change the background image of the whole document whenever somebody clicks it.

I have tried something along the lines of this:

and,

as you can see, I am a beginner at coding in general so any help is appreciated.

My assumption to why it doesn't work is that I am combining javascript with CSS, but I am most likely wrong.

**bluewalrus** · 09-13-2010, 07:14 PM

Yea, I think you want something like

Code:

<input type="button" value="Pattern1" onClick="document.body.style.backgroundImage = 'url(background.png) no-repeat;'">

**[Nicolas]** · 09-13-2010, 07:57 PM

How's this? (It was on here)
Insert this in the <HEAD>:

Code:

<meta name="Author" content="Ronald H. Jankowsky">	
<meta name="Description" content="Slider-Script">
<style>.drag {position: relative; cursor: hand}</style>
<SCRIPT LANGUAGE="JavaScript1.2"> 
// Slider script by Ronald H. Jankowsky (http://rj-edv-beratung.de), parts of code (draglayer, movelayer) by DynamicDrive.com
// This script is free for use, please leave this notice intact
var sPosition;
var showPerc=100;
document.onmousedown=dragLayer
document.onmouseup=new Function("dragMe=false")
 
var Color= new Array();
Color[0] = "00";
Color[1] = "11";
Color[2] = "22";
Color[3] = "33";
Color[4] = "44";
Color[5] = "55";
Color[6] = "66";
Color[7] = "77";
Color[8] = "88";
Color[9] = "99";
Color[10] = "AA";
Color[11] = "BB";
Color[12] = "CC";
Color[13] = "DD";
Color[14] = "EE";
Color[15] = "FF";
 
// Demofunction to change bg-color by moving slider
var rVal,gVal,bVal, cCol
function chgBg() {
	cCol = document.bgColor; rVal=cCol.substr(1,2); gVal=cCol.substr(3,2); bVal=cCol.substr(5,2);
	ind = Math.round(showPerc/16); if (ind < 0) ind = 0; if (ind > 15) ind=15;
// If more sliders are used, each of them has to be handled separately
	if (kObj.id =="knobImg") document.bgColor="#"+Color[ind]+gVal+bVal;
	if (kObj.id =="knobImg1")  document.bgColor="#"+rVal+Color[ind]+bVal;
	if (kObj.id =="knobImg2")  document.bgColor="#"+rVal+gVal+Color[ind];
}
 
// Drag and move engine (original code by DynamicDrive.com), don't change unless explicitely indicated
var dragMe=false, kObj, yPos,direction
function moveLayer() {
if (event.button==1 && dragMe) {
	oldY = kObj.style.pixelTop; kObj.style.pixelTop=temp2+event.clientY-yPos; 
// Limit movement of knob to stay inside layer
	if (kObj.style.pixelTop > oldY) direction="dn"; else direction="up";
	if (kObj.style.pixelTop < 2 && direction=="up") {kObj.style.pixelTop=2; direction="dn";}
	if (kObj.style.pixelTop > 102 && direction=="dn") {kObj.style.pixelTop=102; direction="up";}
// Set working variable 'showPerc' depending on 100 or 250 scaling
	sPosition=kObj.style.pixelTop; showPerc = (perCent[0].checked) ? sPosition-2 : (sPosition-2)/2*5; 
// The following line should be replaced by the function-call with the actual task to perform
	chgBg(); 
	return false; }
}
function dragLayer() {
if (!document.all) return;
if (event.srcElement.className=="drag")	{dragMe=true; kObj=event.srcElement; temp2=kObj.style.pixelTop; yPos=event.clientY; document.onmousemove=moveLayer; }
}
</script>

And this into the <BODY>:

Code:

<body bgcolor="#FFFFFF">
<!-- Each of the 'outerLyr#'-divs creates a slider element. 
There can be as much sliders as needed. Just make sure, 
they have different names, especially the img (knob is referred and acted on by name)-->
 
<div id="outerLyr" style="position:absolute; width:23px; height:120px; z-index:1; left: 155px; top: 111px; background-color: #000000"> 
	<img id="knobImg" src="knob.jpg" class="drag" style="width: 20px; height: 17px; z-index:3; left: 2px; top: 100px">
  <div id="innerLyr" style="position:absolute; width:20px; height:117px; z-index:2; background-color: #777777; left: 2px; top: 2px">
    <div id="barLyr" style="position:absolute; width:2px; height:110px; z-index:1; background-color: #000000; left: 9px; top: 5px"></div>
  </div>
</div>
<div id="outerLyr1" style="position:absolute; width:23px; height:120px; z-index:1; left: 185px; top: 111px; background-color: #000000"> 
	<img id="knobImg1" src="knob.jpg" class="drag" style="width: 20px; height: 17px; z-index:3; left: 2px; top: 100px">
  <div id="innerLyr1" style="position:absolute; width:20px; height:117px; z-index:2; background-color: #777777; left: 2px; top: 2px">
    <div id="barLyr1" style="position:absolute; width:2px; height:110px; z-index:1; background-color: #000000; left: 9px; top: 5px"></div>
  </div>
</div>
<div id="outerLyr2" style="position:absolute; width:23px; height:120px; z-index:1; left: 215px; top: 111px; background-color: #000000"> 
	<img id="knobImg2" src="knob.jpg" class="drag" style="width: 20px; height: 17px; z-index:3; left: 2px; top: 100px">
  <div id="innerLyr2" style="position:absolute; width:20px; height:117px; z-index:2; background-color: #777777; left: 2px; top: 2px">
    <div id="barLyr2" style="position:absolute; width:2px; height:110px; z-index:1; background-color: #000000; left: 9px; top: 5px"></div>
  </div>
<!-- This would be a way to configure if slider range is 0-100 or 0-255 -->
</div>
	<input type="radio" name="perCent" value="false">Prozent
	<input type="radio" name="perCent" value="true" checked>255

Had to 'steal' the source code, code wasn't available.