网页颜色对话框的使用-Javascript-技术教程-asp编程网

index.asp页面的内容
<script language='JavaScript'>
function SelectColor(sEL,form){
    var dEL = document.all(sEL);
    var url = 'selcolor.asp?color='+encodeURIComponent(sEL);
    var arr = showModalDialog(url,window,'dialogWidth:280px;dialogHeight:250px;help:no;scroll:no;status:no');
    if (arr) {
        form.value=arr;
        //sEL.style.backgroundColor=arr;
    }
}
</script>
<form name="form1" method="post" action="">
<input name='FontColor' type='text' value='' size='10' maxlength='10'><a href="#" onclick="SelectColor(this,FontColor)">选择颜色</a>
</form>

selcolor.asp页面内容
<HTML>
<HEAD>
<META content="text/html; charset=gb2312" http-equiv="Content-Type">

<STYLE type=text/css>
TD {FONT-SIZE: 10.8pt}
BODY {FONT-SIZE: 10.8pt}
BUTTON {WIDTH: 5em}
</STYLE>

<SCRIPT language=JavaScript>

var URLParams = new Object() ;
var sAction = URLParams['action'] ;
var sTitle = "";
var color = "" ;
var oSelection;
var oControl;
var sRangeType;

// 是否有效颜色值
function IsColor(color){
var temp=color;
if (temp=="") return true;
if (temp.length!=7) return false;
return (temp.search(/\#[a-fA-F0-9]{6}/) != -1);
}

switch (sAction) {
case "forecolor": // 字体前景色
  sTitle = "字体前景色";
  oSelection = dialogArguments.eWebEditor.document.selection.createRange();
  color = oSelection.queryCommandValue("ForeColor");
  if (color) color = N2Color(color);
  break;
case "backcolor": // 字体背景色
  sTitle = "字体背景色";
  oSelection = dialogArguments.eWebEditor.document.selection.createRange();
  color = oSelection.queryCommandValue("BackColor");
  if (color) color = N2Color(color);
  break;
case "bgcolor":  // 对象背景色
  sTitle = "对象背景色";
  oSelection = dialogArguments.eWebEditor.document.selection.createRange();
  sRangeType = dialogArguments.eWebEditor.document.selection.type;
  if (sRangeType == "Control") {
   oControl = GetControl(oSelection, "TABLE");
  }else{
   oControl = GetParent(oSelection.parentElement());
  }
  if (oControl) {
   switch(oControl.tagName){
   case "TD":
    sTitle += " - 单元格";
    break;
   case "TR":
   case "TH":
    sTitle += " - 表格行";
    break;
   default:
    sTitle += " - 表格";
    break;
   }
   color = oControl.bgColor;
  }else{
   sTitle += " - 网页";
  }
  break;
default:   // 其它颜色框
  if (URLParams['color']){
   color = decodeURIComponent(URLParams['color']) ;
  }
  break;
}

document.write("<TITLE>颜色选择（" + sTitle + "）</TITLE>");

// 默认显示值
if (!color) color = "#000000";

// 返回有背景颜色属性的对象
function GetParent(obj){
while(obj!=null && obj.tagName!="TD" && obj.tagName!="TR" && obj.tagName!="TH" && obj.tagName!="TABLE")
  obj=obj.parentElement;
return obj;
}

// 返回标签名的选定控件
function GetControl(obj, sTag){
obj=obj.item(0);
if (obj.tagName==sTag){
  return obj;
}
return null;
}

// 数值转为RGB16进制颜色格式
function N2Color(s_Color){
s_Color = s_Color.toString(16);
switch (s_Color.length) {
case 1:
  s_Color = "0" + s_Color + "0000";
  break;
case 2:
  s_Color = s_Color + "0000";
  break;
case 3:
  s_Color = s_Color.substring(1,3) + "0" + s_Color.substring(0,1) + "00" ;
  break;
case 4:
  s_Color = s_Color.substring(2,4) + s_Color.substring(0,2) + "00" ;
  break;
case 5:
  s_Color = s_Color.substring(3,5) + s_Color.substring(1,3) + "0" + s_Color.substring(0,1) ;
  break;
case 6:
  s_Color = s_Color.substring(4,6) + s_Color.substring(2,4) + s_Color.substring(0,2) ;
  break;
default:
  s_Color = "";
}
return '#' + s_Color;
}

// 初始值
function InitDocument(){
ShowColor.bgColor = color;
RGB.innerHTML = color;
SelColor.value = color;
}

var SelRGB = color;
var DrRGB = '';
var SelGRAY = '120';

var hexch = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F');

function ToHex(n) {
var h, l;

n = Math.round(n);
l = n % 16;
h = Math.floor((n / 16)) % 16;
return (hexch[h] + hexch[l]);
}

function DoColor(c, l){
var r, g, b;

r = '0x' + c.substring(1, 3);
g = '0x' + c.substring(3, 5);
b = '0x' + c.substring(5, 7);

if(l > 120){
  l = l - 120;

  r = (r * (120 - l) + 255 * l) / 120;
  g = (g * (120 - l) + 255 * l) / 120;
  b = (b * (120 - l) + 255 * l) / 120;
}else{
  r = (r * l) / 120;
  g = (g * l) / 120;
  b = (b * l) / 120;
}

return '#' + ToHex(r) + ToHex(g) + ToHex(b);
}

function EndColor(){
var i;

if(DrRGB != SelRGB){
  DrRGB = SelRGB;
  for(i = 0; i <= 30; i ++)
  GrayTable.rows(i).bgColor = DoColor(SelRGB, 240 - i * 8);
}

SelColor.value = DoColor(RGB.innerText, GRAY.innerText);
ShowColor.bgColor = SelColor.value;
}
</SCRIPT>

<SCRIPT event=onclick for=ColorTable language=JavaScript>
SelRGB = event.srcElement.bgColor;
EndColor();
</SCRIPT>

<SCRIPT event=onmouseover for=ColorTable language=JavaScript>
RGB.innerText = event.srcElement.bgColor;
EndColor();
</SCRIPT>

<SCRIPT event=onmouseout for=ColorTable language=JavaScript>
RGB.innerText = SelRGB;
EndColor();
</SCRIPT>

<SCRIPT event=onclick for=GrayTable language=JavaScript>
SelGRAY = event.srcElement.title;
EndColor();
</SCRIPT>

<SCRIPT event=onmouseover for=GrayTable language=JavaScript>
GRAY.innerText = event.srcElement.title;
EndColor();
</SCRIPT>

<SCRIPT event=onmouseout for=GrayTable language=JavaScript>
GRAY.innerText = SelGRAY;
EndColor();
</SCRIPT>

<SCRIPT event=onclick for=Ok language=JavaScript>
color = SelColor.value;
if (!IsColor(color)){
  alert('无效的颜色值！');
  return;
}

switch (sAction) {
  case "forecolor":
   dialogArguments.format('ForeColor', color) ;
   window.returnValue = null;
   break;
  case "backcolor":
   dialogArguments.format('BackColor', color) ;
   window.returnValue = null;
   break;
  case "bgcolor":
   if (oControl){
    oControl.bgColor = color;
   }else{
    dialogArguments.setHTML("<table border=0 cellpadding=0 cellspacing=0 width='100%' height='100%'><tr><td valign=top bgcolor='"+color+"'>"+dialogArguments.getHTML()+"</td></tr></table>");
   }
   window.returnValue = null;
   break;
  default:
   window.returnValue = color;
   break;
}
window.close();
</SCRIPT>

</HEAD>

<BODY bgColor=#D4D0C8 onload="InitDocument()">
<DIV align=center>
<CENTER>
  <TABLE border=0 cellPadding=0 cellSpacing=10>
   <TBODY>
    <TR>
     <TD>
      <TABLE border=0 cellPadding=0 cellSpacing=0 id=ColorTable style="CURSOR: hand">
        <SCRIPT language=JavaScript>
          function wc(r, g, b, n){
            r = ((r * 16 + r) * 3 * (15 - n) + 0x80 * n) / 15;
     g = ((g * 16 + g) * 3 * (15 - n) + 0x80 * n) / 15;
     b = ((b * 16 + b) * 3 * (15 - n) + 0x80 * n) / 15;
             document.write('<TD BGCOLOR=#' + ToHex(r) + ToHex(g) + ToHex(b) + ' height=8 width=8></TD>');
          }

         var cnum = new Array(1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 0);

        for(i = 0; i < 16; i ++){
    document.write('<TR>');
    for(j = 0; j < 30; j ++){
  n1 = j % 5;
  n2 = Math.floor(j / 5) * 3;
  n3 = n2 + 3;

  wc((cnum[n3] * n1 + cnum[n2] * (5 - n1)),
  (cnum[n3 + 1] * n1 + cnum[n2 + 1] * (5 - n1)),
  (cnum[n3 + 2] * n1 + cnum[n2 + 2] * (5 - n1)), i);
         }
          document.writeln('</TR>');
         }
       </SCRIPT>
       <TBODY></TBODY>
      </TABLE>
     </TD>
     <TD>
      <TABLE border=0 cellPadding=0 cellSpacing=0 id=GrayTable style="CURSOR: hand">
        <SCRIPT language=JavaScript>
          for(i = 255; i >= 0; i -= 8.5)
            document.write('<TR BGCOLOR=#' + ToHex(i) + ToHex(i) + ToHex(i) + '><TD TITLE=' + Math.floor(i * 16 / 17) + ' height=4 width=20></TD></TR>');
        </SCRIPT>
        <TBODY></TBODY>
      </TABLE>
     </TD>
   </TR>
</TBODY>
</TABLE>
</CENTER>
</DIV>
<DIV align=center>
<CENTER>
<TABLE border=0 cellPadding=0 cellSpacing=10>
  <TBODY>
   <TR>
     <TD align=middle rowSpan=2>选中色彩
      <TABLE border=1 cellPadding=0 cellSpacing=0 height=30 id=ShowColor width=40 bgcolor="">
       <TBODY>
        <TR><TD></TD></TR>
       </TBODY>
      </TABLE>
     </TD>
     <TD rowSpan=2>基色: <SPAN id=RGB></SPAN><BR>亮度: <SPAN id=GRAY>120</SPAN><BR>代码: <INPUT id=SelColor size=7 value=""></TD>
     <TD><BUTTON id=Ok type=submit>确定</BUTTON></TD></TR>
   <TR>
    <TD><BUTTON onclick=window.close();>取消</BUTTON></TD>
   </TR>
  </TBODY>
</TABLE>
</CENTER>
</DIV>
</BODY>
</HTML>
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