Here is the code
example.html
<html>
<head>
<title>Autosuggest Example</title>
<script type="text/javascript" src="json.
js"></script>
<script type="text/javascript" src="zxml.
js"></script>
<script type="text/javascript" src="autosuggest.
js"></script>
<link rel="stylesheet" type="text/css" href="autosuggest.css" />
<script type="text/javascript">
window.onload = function () {
var oTextbox = new AutoSuggestControl(document.getElementById("txtSta te"), new SuggestionProvider());
}
</script>
</head>
<body>
<form method="get" onsubmit="alert('Submitted!')">
<table border="0">
<tr>
<td>Name:</td>
<td><input type="text" name="txtName" id="txtName" /></td>
</tr>
<tr>
<td>State/Province:</td>
<td><input type="text" name="txtState" id="txtState" autocomplete="off"/></td>
</tr>
<tr>
<td>Country:</td>
<td><select name="country" id="country"><option value="IN">India</option></select></td>
</tr>
</table>
</form>
</body>
</html>
autosuggest.
js
/**
* An autosuggest textbox control.
* @class
* @scope public
*/
function AutoSuggestControl(oTextbox /*:HTMLInputElement*/,
oProvider /*:SuggestionProvider*/) {
/**
* The currently selected suggestions.
* @scope private
*/
this.cur /*:int*/ = -1;
/**
* The dropdown list layer.
* @scope private
*/
this.layer = null;
/**
* Suggestion provider for the autosuggest feature.
* @scope private.
*/
this.provider /*:SuggestionProvider*/ = oProvider;
/**
* The textbox to capture.
* @scope private
*/
this.textbox /*:HTMLInputElement*/ = oTextbox;
/**
* Timeout ID for fast typers.
* @scope private
*/
this.timeoutId /*:int*/ = null;
/**
* The text that the user typed.
* @scope private
*/
this.userText /*:String*/ = oTextbox.value;
//initialize the control
this.init();
}
/**
* Autosuggests one or more suggestions for what the user has typed.
* If no suggestions are passed in, then no autosuggest occurs.
* @scope private
* @param aSuggestions An array of suggestion strings.
* @param bTypeAhead If the control should provide a type ahead suggestion.
*/
AutoSuggestControl.prototype.autosuggest = function (aSuggestions /*:Array*/,
bTypeAhead /*:boolean*/) {
//re-initialize pointer to current suggestion
this.cur = -1;
//make sure there's at least one suggestion
if (aSuggestions.length > 0) {
this.showSuggestions(aSuggestions);
if (bTypeAhead)
this.typeAhead(aSuggestions[0]);
} else {
this.hideSuggestions();
}
};
/**
* Creates the dropdown layer to display multiple suggestions.
* @scope private
*/
AutoSuggestControl.prototype.createDropDown = function () {
//create the layer and assign styles
this.layer = document.createElement("div");
this.id="suggestDiv";
this.layer.className = "suggestions";
this.layer.style.visibility = "hidden";
this.layer.style.width = this.textbox.offsetWidth;
document.body.appendChild(this.layer);
//when the user clicks on the a suggestion, get the text (innerHTML)
//and place it into a textbox
var oThis = this;
this.layer.onmousedown =
this.layer.onmouseup =
this.layer.onmouseover = function (oEvent) {
oEvent = oEvent || window.event;
oTarget = oEvent.target || oEvent.srcElement;
if (oEvent.type == "mousedown") {
oThis.textbox.value = oTarget.firstChild.nodeValue;
oThis.hideSuggestions();
} else if (oEvent.type == "mouseover") {
oThis.highlightSuggestion(oTarget);
} else {
oThis.textbox.focus();
oThis.textbox.value = oThis.textbox.value;
}
};
};
/**
* Gets the left coordinate of the textbox.
* @scope private
* @return The left coordinate of the textbox in pixels.
*/
AutoSuggestControl.prototype.getLeft = function () /*:int*/ {
var oNode = this.textbox;
var iLeft = 0;
while(oNode.tagName != "BODY") {
iLeft += oNode.offsetLeft;
oNode = oNode.offsetParent;
}
return iLeft;
};
/**
* Gets the top coordinate of the textbox.
* @scope private
* @return The top coordinate of the textbox in pixels.
*/
AutoSuggestControl.prototype.getTop = function () /*:int*/ {
var oNode = this.textbox;
var iTop = 0;
while(oNode.tagName != "BODY") {
iTop += oNode.offsetTop;
oNode = oNode.offsetParent;
}
return iTop;
};
/**
* Highlights the next or previous suggestion in the dropdown and
* places the suggestion into the textbox.
* @param iDiff Either a positive or negative number indicating whether
* to select the next or previous sugggestion, respectively.
* @scope private
*/
AutoSuggestControl.prototype.goToSuggestion = function (iDiff /*:int*/) {
var cSuggestionNodes = this.layer.childNodes;
if (cSuggestionNodes.length > 0) {
var oNode = null;
if (iDiff > 0) {
if (this.cur < cSuggestionNodes.length-1)
oNode = cSuggestionNodes[++this.cur];
} else if (this.cur > 0) {
oNode = cSuggestionNodes[--this.cur];
}
if (oNode) {
this.highlightSuggestion(oNode);
this.textbox.value = oNode.firstChild.nodeValue;
}
}
};
/**
* Handles three keydown events.
* @scope private
* @param oEvent The event object for the keydown event.
*/
AutoSuggestControl.prototype.handleKeyDown = function (oEvent /*:Event*/) {
switch(oEvent.keyCode) {
case 38: //up arrow
this.goToSuggestion(-1);
break;
case 40: //down arrow
this.goToSuggestion(1);
break;
case 27: //esc
this.textbox.value = this.userText;
this.selectRange(this.userText.length, 0);
//break;
/* falls through */
case 13: //enter
this.hideSuggestions();
oEvent.returnValue = false;
if (oEvent.preventDefault) {
oEvent.preventDefault();
}
break;
}
};
/**
* Handles keyup events.
* @scope private
* @param oEvent The event object for the keyup event.
*/
AutoSuggestControl.prototype.handleKeyUp = function (oEvent /*:Event*/) {
var iKeyCode = oEvent.keyCode;
var oThis = this;
//get the currently entered text
this.userText = this.textbox.value;
clearTimeout(this.timeoutId);
//for backspace (8) and delete (46), shows suggestions without typeahead
if (iKeyCode == 8 || iKeyCode == 46) {
this.timeoutId = setTimeout( function () {
oThis.provider.requestSuggestions(oThis, false);
}, 250);
//make sure not to interfere with non-character keys
} else if (iKeyCode < 32 || (iKeyCode >= 33 && iKeyCode < 46) || (iKeyCode >= 112 && iKeyCode <= 123)) {
//ignore
} else {
//request suggestions from the suggestion provider with typeahead
this.timeoutId = setTimeout( function () {
oThis.provider.requestSuggestions(oThis, true);
}, 250);
}
};
/**
* Hides the suggestion dropdown.
* @scope private
*/
AutoSuggestControl.prototype.hideSuggestions = function () {
this.layer.style.visibility = "hidden";
var el=document.getElementById('suggIFrame')
if(el != null && el != 'undefined'){
var arr = new Array(el);
if(arr.length > 0){arr[0].parentNode.removeChild(arr[0]);}
}
};
/**
* Highlights the given node in the suggestions dropdown.
* @scope private
* @param oSuggestionNode The node representing a suggestion in the dropdown.
*/
AutoSuggestControl.prototype.highlightSuggestion = function (oSuggestionNode) {
for (var i=0; i < this.layer.childNodes.length; i++) {
var oNode = this.layer.childNodes[i];
if (oNode == oSuggestionNode) {
oNode.className = "current"
} else if (oNode.className == "current") {
oNode.className = "";
}
}
};
/**
* Initializes the textbox with event handlers for
* auto suggest functionality.
* @scope private
*/
AutoSuggestControl.prototype.init = function () {
//save a reference to this object
var oThis = this;
//assign the onkeyup event handler
this.textbox.onkeyup = function (oEvent) {
//check for the proper location of the event object
if (!oEvent) {
oEvent = window.event;
}
//call the handleKeyUp() method with the event object
oThis.handleKeyUp(oEvent);
};
//assign onkeydown event handler
this.textbox.onkeydown = function (oEvent) {
//check for the proper location of the event object
if (!oEvent) {
oEvent = window.event;
}
//call the handleKeyDown() method with the event object
oThis.handleKeyDown(oEvent);
};
//assign onblur event handler (hides suggestions)
this.textbox.onblur = function () {
oThis.hideSuggestions();
};
//create the suggestions dropdown
this.createDropDown();
};
/**
* Selects a range of text in the textbox.
* @scope public
* @param iStart The start index (base 0) of the selection.
* @param iEnd The end index of the selection.
*/
AutoSuggestControl.prototype.selectRange = function (iStart /*:int*/, iEnd /*:int*/) {
//use text ranges for Internet Explorer
if (this.textbox.createTextRange) {
var oRange = this.textbox.createTextRange();
oRange.moveStart("character", iStart);
oRange.moveEnd("character", iEnd - this.textbox.value.length);
oRange.select();
//use setSelectionRange() for Mozilla
} else if (this.textbox.setSelectionRange) {
this.textbox.setSelectionRange(iStart, iEnd);
}
//set focus back to the textbox
this.textbox.focus();
};
AutoSuggestControl.prototype.selectRange1 = function(oText, oSuggest){
var oLen = oText.value.length;
var nIdx = oSuggest.toLowerCase().indexOf( oText.value, 0 )
if( nIdx == 0 && oSuggest.length > oText.value.length )
{
oText.value = oSuggest;
if( oText.createTextRange )
{
hRange = oText.createTextRange();
hRange.findText( oSuggest.substr( oLen ) );
hRange.select()
}
else
{
oText.setSelectionRange( oLen, oSuggest.length );
}
}
};
/**
* Inserts a suggestion into the textbox, highlighting the
* suggested part of the text.
* @scope private
* @param sSuggestion The suggestion for the textbox.
*/
AutoSuggestControl.prototype.typeAhead = function (sSuggestion /*:String*/) {
//check for support of typeahead functionality
if (this.textbox.createTextRange || this.textbox.setSelectionRange){
var iLen = this.textbox.value.length;
this.textbox.value = sSuggestion;
this.selectRange(iLen, sSuggestion.length);
//this.selectRange1(this.textbox,sSuggestion)
}
};
/**
* Builds the suggestion layer contents, moves it into position,
* and displays the layer.
* @scope private
* @param aSuggestions An array of suggestions for the control.
*/
AutoSuggestControl.prototype.showSuggestions = function (aSuggestions /*:Array*/) {
var oDiv = null;
this.layer.innerHTML = ""; //clear contents of the layer
for (var i=0; i < aSuggestions.length; i++) {
oDiv = document.createElement("div");
oDiv.appendChild(document.createTextNode(aSuggesti ons[i]));
this.layer.appendChild(oDiv);
}
this.layer.style.left = this.getLeft() + "px";
this.layer.style.top = (this.getTop()+this.textbox.offsetHeight) + "px";
this.layer.style.visibility = "visible";
if(navigator.appName == "Microsoft Internet Explorer")
{
var divNode = this.layer;
divNode.insertAdjacentHTML("afterEnd", '<IFRAME frameBorder="0" scrolling="no" id="suggIFrame" name="suggIFrame"style="position:absolute; z-index:5; filter:progid:DXImageTransform.Microsoft.Alpha(opa city=0); " />');
var iframeShim = document.getElementById("suggIFrame");
iframeShim.style.top = divNode.style.top;
iframeShim.style.left = divNode.style.left
iframeShim.style.width = divNode.offsetWidth;
iframeShim.style.height = divNode.offsetHeight;
}
};
/**
* Provides suggestions for state/province names.
* @class
* @scope public
*/
function SuggestionProvider() {
this.http = zXmlHttp.createRequest();
}
/**
* Request suggestions for the given autosuggest control.
* @scope protected
* @param oAutoSuggestControl The autosuggest control to provide suggestions for.
*/
SuggestionProvider.prototype.requestSuggestions = function (oAutoSuggestControl /*:AutoSuggestControl*/,
bTypeAhead /*:boolean*/) {
var oHttp = this.http;
//cancel any active requests
if (oHttp.readyState != 0) {
oHttp.abort();
}
//define the data
var oData = {
requesting: "StatesAndProvinces",
text: oAutoSuggestControl.userText,
limit: 5
};
//open connection to server
oHttp.open("post", "suggestions.php", true);
oHttp.onreadystatechange = function () {
if (oHttp.readyState == 4) {
//evaluate the returned text JavaScript (an array)
var aSuggestions = JSON.parse(oHttp.responseText);
//provide suggestions to the control
oAutoSuggestControl.autosuggest(aSuggestions, bTypeAhead);
}
};
//send the request
oHttp.send(JSON.stringify(oData));
};
http://www.nczonline.net/downloads/
AutoSuggest typeAhead issue
