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9: Dynamic User Interfaces
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DOM makes it possible to create entirely new page elements, your applications can achieve user interactions that weren t possible before: elements can come and go, text can change colors and styles, and even forms and form elements can be created and processed dynamically Let s begin by taking a look at how to create a color picker user interface
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One of the more complex user-interface gadgets I ve always admired is the color picker Color pickers usually have several characteristics in common: they display a range of colors from which the user can choose, they display the currently selected color, and they display the color that the mouse is currently over Using the DOM, you can create a color picker that performs all of these tasks Figure 9-1 shows a page that contains a dynamically generated color picker that allows a user to select a color and then displays that color in a box In addition, as
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Figure 9-1
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the mouse is being moved over the picker, the color that the mouse is currently hovering over is also displayed Creating the color picker involves three major steps First, the code generates a table whose cells represent the various background colors Next, each table cell has the appropriate event handlers registered to detect mouse click and mouse-over events Finally, the event handlers are written to respond to the events and allow the user to select a color Listing 9-1 lists the code for the color picker HTML page
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<HTML> <HEAD> <TITLE>Color Picker Demo</TITLE> <SCRIPT SRC="CreateColorPickerjs"></SCRIPT> </HEAD> <BODY BGCOLOR="#FFFFFF"> <SCRIPT> var oBody = documentgetElementsByTagName('BODY')item(0); oBodyinsertBefore(createColorTable(),oBodyfirstChild); </SCRIPT> <P> <TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="339"> <TR> <TD WIDTH="232">The color you selected is:</TD> <TD STYLE="BORDER:1px solid #000000" ID="colorCell" WIDTH="105"> </TD> </TR> <TR> <TD WIDTH="232">The color you are hovering over is:</TD> <TD STYLE="BORDER:1px solid #000000" ID="hoverCell" WIDTH="105"> </TD> </TR> </TABLE> </BODY> </HTML>
The page includes an external JavaScript file called ColorPickerjs, which contains the code that controls the picker The body section contains a script that
9: Dynamic User Interfaces
creates the color picker user interface and inserts it as the first child of the body section, along with a static table that displays the selected color and the color that the mouse is hovering over Listing 9-2 shows the code that controls the color picker
Listing 9-2
CreateColorPickerjs
function createColorTable() { var tableNode = documentcreateElement("TABLE"); var oTableHead = documentcreateElement("THEAD"); var oTableBody = documentcreateElement("TBODY"); var colorArray = new Array("00","33","66","99","CC","FF"); var i,j; var oTR, oTD; var colorStr = ""; var color1,color2,color3; tableNodeappendChild(oTableHead); tableNodeappendChild(oTableBody); tableNodesetAttribute("border","1"); tableNodesetAttribute("width","400"); tableNodesetAttribute("id","colorTable"); for (i=0; i < 6; i++) { color2 = colorArray[(6-i)-1]; oTR = documentcreateElement("TR"); for (j=0; j < 6; j++) { color1 = colorArray[5]; color3 = colorArray[j]; colorStr = "#"+color1+color2+color3; oTRappendChild(createColorCell(colorStr)); } for (j=0; j < 6; j++) { color1 = colorArray[3]; color3 = colorArray[(6-j)-1]; colorStr = "#"+color1+color2+color3; oTRappendChild(createColorCell(colorStr));
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} for (j=0; j < 6; j++) { color1 = colorArray[1]; color3 = colorArray[j]; colorStr = "#"+color1+color2+color3; oTRappendChild(createColorCell(colorStr)); } oTableBodyappendChild(oTR); } for (i=0; i < 6; i++) { color2 = colorArray[i]; oTR = documentcreateElement("TR"); for (j=0; j < 6; j++) { color1 = colorArray[4]; color3 = colorArray[j]; colorStr = "#"+color1+color2+color3; oTRappendChild(createColorCell(colorStr)); } for (j=0; j < 6; j++) { color1 = colorArray[2]; color3 = colorArray[(6-j)-1]; colorStr = "#"+color1+color2+color3; oTRappendChild(createColorCell(colorStr)); } for (j=0; j < 6; j++) { color1 = colorArray[0]; color3 = colorArray[j]; colorStr = "#"+color1+color2+color3; oTRappendChild(createColorCell(colorStr)); } oTableBodyappendChild(oTR); } return tableNode; } function createColorCell(colorStr) {
9: Dynamic User Interfaces
oTD = documentcreateElement("TD"); oTDstylebackgroundColor=colorStr; addClickHandler(oTD,selectColor); addMouseOverHandler(oTD,hoverColor); oTDinnerHTML = " "; return oTD; } function addClickHandler(oNode, oFunction) { if (typeof(windowevent) != "undefined") oNodeattachEvent("onclick",oFunction); else oNodeaddEventListener("click",oFunction,true); } function addMouseOverHandler(oNode, oFunction) { if (typeof(windowevent) != "undefined") oNodeattachEvent("onmouseover",oFunction); else oNodeaddEventListener("mouseover",oFunction,true); } function selectColor(evt) { var oTarget; if (typeof(windowevent) != "undefined") oTarget = windoweventsrcElement; else oTarget = evtcurrentTarget; documentgetElementById("colorCell")stylebackgroundColor = oTargetstylebackgroundColor; } function hoverColor(evt) { var oTarget; if (typeof(windowevent) != "undefined") oTarget = windoweventsrcElement; else
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