Use slider to create a color mixer

 
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<!-- The following code is revised from SmartClient demo code(SmartClient_70rc2_LGPL.zip).-->



<HTML><HEAD>
  <SCRIPT>var isomorphicDir="isomorphic/";</SCRIPT>
    <SCRIPT SRC=isomorphic/system/modules/ISC_Core.js></SCRIPT>
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  <SCRIPT SRC=isomorphic/skins/SmartClient/load_skin.js></SCRIPT>
</HEAD><BODY BGCOLOR='powderblue' MARGINHEIGHT=0 MARGINWIDTH=0 LEFTMARGIN=0 TOPMARGIN=0>
<TABLE WIDTH=100% CELLSPACING=0 CELLPADDING=5 BORDER=0><TR><TD CLASS=pageHeader BGCOLOR=WHITE>

  Slider color mixer example

</TD><TD CLASS=pageHeader ALIGN=RIGHT BGCOLOR=WHITE>

  Isomorphic SmartClient SDK

</TD></TR></TABLE><TABLE WIDTH=100% CELLSPACING=0 CELLPADDING=0 BORDER=0><TR>
<TD BGCOLOR=336666><IMG SRC=images/blank.gif WIDTH=1 HEIGHT=4></TD></TR></TABLE>


<!--------------------------
  Example code starts here
---------------------------->

<SCRIPT>

function num2hex(num) {
  var lowWord = num%16,
    highWord = (num-lowWord)/16;
  return num2hexdigit(highWord)+""+num2hexdigit(lowWord);
}

function num2hexdigit(num) {
  if (num == 10) return "A";
  else if (num == 11) return "B";
  else if (num == 12) return "C";
  else if (num == 13) return "D";
  else if (num == 14) return "E";
  else if (num == 15) return "F";
  else return ""+num;
}

var colorBox = Canvas.newInstance({
  left:400,
  top:115,
  width:200,
  height:200,
  red:"77",
  green:"77",
  blue:"77",
  backgroundColor:"777777",
  sliderMove:function(event,slider){
    var newColor = num2hex(Math.round(slider.value));
    if (slider.ID == "sliderRed") this.red = newColor;
    else if (slider.ID == "sliderGreen") this.green = newColor;
    else if (slider.ID == "sliderBlue") this.blue = newColor;
    this.setBackgroundColor(this.red+""+this.green+""+this.blue);
    return false;
  }
});

Slider.newInstance({
  ID:"sliderRed",
  title:"Red",
  left:60,
  top:90,
  sliderTarget:colorBox,
  value:128,
  minValue:0,
  maxValue:255
});


Slider.newInstance({
  ID:"sliderGreen",
  title:"Green",
  left:155,
  top:90,
  //sliderTarget:colorBox,
  value:128,
  minValue:0,
  maxValue:255
});


Slider.newInstance({
  ID:"sliderBlue",
  title:"Blue",
  left:250,
  top:90,
  //sliderTarget:colorBox,
  value:128,
  minValue:0,
  maxValue:255
});


Slider.newInstance({
  ID:"sliderSize",
  title:"Size",
  left:350,
  top:330,
  vertical:false,
  value:200,
  minValue:20,
  minValueLabel:"Small",
  maxValue:200,
  maxValueLabel:"Big",
  numValues:10
});


//colorBox.observe(sliderRed, "valueChanged", "observer.sliderMove(null,observed)");
colorBox.observe(sliderGreen, "valueChanged", "observer.sliderMove(null,observed)");
colorBox.observe(sliderBlue, "valueChanged", "observer.sliderMove(null,observed)");
colorBox.observe(sliderSize, "valueChanged", "observer.resizeTo(observed.value,observed.value)");

</SCRIPT>
</BODY>
</HTML>

Related examples in the same category

1.	Create, position, and size the slider and its two children (_track and _thumb) make the thumb drag-repositionable
2.	Make slider thumb draggable calculate and set constrained thumb position when dragging
3.	Add value and sliderTarget properties, calculate new value when thumb is moved, send sliderMove message to sliderTarget when thumb is moved
4.	Add value setter and getter methods and use setter to init value
5.	Add valueChanged() observable method
6.	Convert track and thumb to StretchImg and Img widgets
7.	Specify skin directory and images
8.	Add mouse handlers to set the thumb's state
9.	Add a custom cursor to the thumb
10.	Use Slider to set the border width
11.	Number slider
12.	Vertical Slider, min value, max value
13.	Value changed event for Slider
14.	Horizontal slider
15.	Error checking of newValue in setValue()

Use slider to create a color mixer : Slider « SmartClient « JavaScript DHTML

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