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# YUI Library Examples: Button Control: Color Picker Button

# Button Control: Color Picker Button

This example demonstrates how to render a Color Picker into the Menu of a Split Button. Use the Color Picker Button below to create a duotone by selecting the background color that should be applied to the image.

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Background Color:

Begin by creating a Menu instance that will house the ColorPicker instance. Next, instantiate a new Button of type "split," setting its "menu" attribute to the Menu instance.

// Create a Menu instance to house the ColorPicker instance var oColorPickerMenu = new YAHOO.widget.Menu("color-picker-menu"); // Create a Button instance of type "split" var oButton = new YAHOO.widget.Button({ type: "split", id: "color-picker-button", label: "<em id=\"current-color\">Current color is #FFFFFF.</em>", menu: oColorPickerMenu, container: this });

Once the new Button is created, add a listener for its "appendTo" event that will be used to render its Menu instance into the same DOM element specified as the containing element for the Button.

oButton.on("appendTo", function () { /* Create an empty body element for the Menu instance in order to reserve space to render the ColorPicker instance into. */ oColorPickerMenu.setBody(" "); oColorPickerMenu.body.id = "color-picker-container"; // Render the Menu into the Button instance's parent element oColorPickerMenu.render(this.get("container")); });

Once the new Button is created, add a listener for its "option" event that will be used to create a new ColorPicker instance. (Defering the creation of the ColorPicker until the firing of the "option" event improves the intial load time of the Button instance.)

function onButtonOption() { /* Create a new ColorPicker instance, placing it inside the body element of the Menu instance. */ var oColorPicker = new YAHOO.widget.ColorPicker(oColorPickerMenu.body.id, { showcontrols: false, images: { PICKER_THUMB: "../../build/colorpicker/assets/picker_thumb.png", HUE_THUMB: "../../build/colorpicker/assets/hue_thumb.png" } }); /* Add a listener for the ColorPicker instance's "rgbChange" event to update the background color and text of the Button's label to reflect the change in the value of the ColorPicker. */ oColorPicker.on("rgbChange", function (p_oEvent) { var sColor = "#" + this.get("hex"); oButton.set("value", sColor); YAHOO.util.Dom.setStyle("current-color", "backgroundColor", sColor); YAHOO.util.Dom.get("current-color").innerHTML = "Current color is " + sColor; }); // Remove this event listener so that this code runs only once this.unsubscribe("option", onButtonOption); } /* Add a listener for the "option" event. This listener will be used to defer the creation the ColorPicker instance until the first time the Button's Menu instance is requested to be displayed by the user. */ oButton.on("option", onButtonOption); /* Add a listener for the "click" event. This listener will be used to apply the the background color to the photo. */ oButton.on("click", function () { YAHOO.util.Dom.setStyle("photo", "backgroundColor", this.get("value")); });

Lastly, add some styles that customize both the Button's text label and the ColorPicker instance.

#button-container { padding: .5em; } #color-picker-button { vertical-align: baseline; } #color-picker-button button { outline: none; /* Safari */ line-height: 1.5; } /* Style the Button instance's label as a square whose background color represents the current value of the ColorPicker instance. */ #current-color { display: block; display: inline-block; *display: block; /* For IE */ margin-top: .5em; *margin: .25em 0; /* For IE */ width: 1em; height: 1em; overflow: hidden; text-indent: 1em; background-color: #fff; white-space: nowrap; border: solid 1px #000; } /* Hide default colors for the ColorPicker instance. */ #color-picker-container .yui-picker-controls, #color-picker-container .yui-picker-swatch, #color-picker-container .yui-picker-websafe-swatch { display: none; } /* Size the body element of the Menu instance to match the dimensions of the ColorPicker instance. */ #color-picker-menu .bd { width: 220px; height: 190px; } #photo { background: #fff url(../button/assets/ggbridge.png) top left no-repeat; /* Hide the alpha PNG from IE 6 and make the background image transparent via the use of the AlphaImageLoader that is applied by the filter property. */ _background-image: none; _filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='../button/assets/ggbridge.png', sizingMethod='image');; border: solid 1px #000; width: 400px; height: 300px; _width: 398px; /* For IE 6 */ _height: 298px; /* For IE 6 */ } #button-container { border-top: solid 1px #000; padding: .5em .25em; margin-top: .5em; }

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### Button Control Examples:

### More Button Control Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

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