asp.net mvc自动完成

 本文来自zilchwei.转载请注明出处!

今天介绍asp.net mvc 自动完成功能:

首先我对自动完成做一个简单的介绍:我们在使用google查询关键字的时候  google会自动判断出我们可能需要到的关键字并列出来供大家选择

例如:我们输入asp的时候  google会给我们列出asp.net    asp.net mvc等等.这样对于用户的帮助体验会更舒服..今天我们将会走入这个功能.

当然这里必须先说明我的测试环境:

操作系统:windows server 2008 r2

开发软件:visual studio 2010中文版+asp.net mvc 2.0中文版.

浏览器信息:IE8

开始我们的第一步:

      我们会用到1个js  1个css

jquery.autocomplete.css:代码如下

代码
.ac_results {
padding: 0px;
border: 1px solid black;
background
-color: white;
overflow: hidden;
z
-index: 99999;
}

.ac_results ul {
width:
100%;
list
-style-position: outside;
list
-style: none;
padding:
0;
margin:
0;
}

.ac_results li {
margin: 0px;
padding: 2px 5px;
cursor:
default;
display: block;
/*
if width will be 100% horizontal scrollbar will apear
when scroll mode will be used
*/
/*width: 100%;*/
font: menu;
font
-size: 12px;
/*
it is very important, if line-height not setted or setted
in relative units scroll will be broken in firefox
*/
line
-height: 16px;
overflow: hidden;
}

.ac_loading {
background: white url(
'indicator.gif') right center no-repeat;
}

.ac_odd {
background
-color: #eee;
}

.ac_over {
background
-color: #0A246A;
color: white;
}

jquery.autocomplete.js:代码:

代码
/*
* jQuery Autocomplete plugin 1.1
*
* Copyright (c) 2009 J?rn Zaefferer
*
* Dual licensed under the MIT and GPL licenses:
*
http://www.opensource.org/licenses/mit-license.php
*
http://www.gnu.org/licenses/gpl.html
*
* Revision: $Id: jquery.autocomplete.js 15 2009-08-22 10:30:27Z joern.zaefferer $
*/

;(function($) {

$.fn.extend({
autocomplete: function(urlOrData, options) {
var isUrl
= typeof urlOrData == "string";
options
= $.extend({}, $.Autocompleter.defaults, {
url: isUrl
? urlOrData : null,
data: isUrl
? null : urlOrData,
delay: isUrl
? $.Autocompleter.defaults.delay : 10,
max: options
&& !options.scroll ? 10 : 150
}, options);

// if highlight is set to false, replace it with a do-nothing function
options.highlight = options.highlight || function(value) { return value; };

// if the formatMatch option is not specified, then use formatItem for backwards compatibility
options.formatMatch = options.formatMatch || options.formatItem;

return this.each(function() {
new $.Autocompleter(this, options);
});
},
result: function(handler) {
return this.bind("result", handler);
},
search: function(handler) {
return this.trigger("search", [handler]);
},
flushCache: function() {
return this.trigger("flushCache");
},
setOptions: function(options){
return this.trigger("setOptions", [options]);
},
unautocomplete: function() {
return this.trigger("unautocomplete");
}
});

$.Autocompleter
= function(input, options) {

var KEY
= {
UP:
38,
DOWN:
40,
DEL:
46,
TAB:
9,
RETURN:
13,
ESC:
27,
COMMA:
188,
PAGEUP:
33,
PAGEDOWN:
34,
BACKSPACE:
8
};

// Create $ object for input element
var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass);

var timeout;
var previousValue
= "";
var cache
= $.Autocompleter.Cache(options);
var hasFocus
= 0;
var lastKeyPressCode;
var config
= {
mouseDownOnSelect:
false
};
var select
= $.Autocompleter.Select(options, input, selectCurrent, config);

var blockSubmit;

// prevent form submit in opera when selecting with return key
$.browser.opera && $(input.form).bind("submit.autocomplete", function() {
if (blockSubmit) {
blockSubmit
= false;
return false;
}
});

// only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
$input.bind(($.browser.opera ? "keypress" : "keydown") + ".autocomplete", function(event) {
// a keypress means the input has focus
// avoids issue where input had focus before the autocomplete was applied
hasFocus = 1;
// track last key pressed
lastKeyPressCode = event.keyCode;
switch(event.keyCode) {

case KEY.UP:
event.preventDefault();
if ( select.visible() ) {
select.prev();
}
else {
onChange(
0, true);
}
break;

case KEY.DOWN:
event.preventDefault();
if ( select.visible() ) {
select.next();
}
else {
onChange(
0, true);
}
break;

case KEY.PAGEUP:
event.preventDefault();
if ( select.visible() ) {
select.pageUp();
}
else {
onChange(
0, true);
}
break;

case KEY.PAGEDOWN:
event.preventDefault();
if ( select.visible() ) {
select.pageDown();
}
else {
onChange(
0, true);
}
break;

// matches also semicolon
case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
case KEY.TAB:
case KEY.RETURN:
if( selectCurrent() ) {
// stop default to prevent a form submit, Opera needs special handling
event.preventDefault();
blockSubmit
= true;
return false;
}
break;

case KEY.ESC:
select.hide();
break;

default:
clearTimeout(timeout);
timeout
= setTimeout(onChange, options.delay);
break;
}
}).focus(function(){
// track whether the field has focus, we shouldn't process any
// results if the field no longer has focus
hasFocus++;
}).blur(function() {
hasFocus
= 0;
if (!config.mouseDownOnSelect) {
hideResults();
}
}).click(function() {
// show select when clicking in a focused field
if ( hasFocus++ > 1 && !select.visible() ) {
onChange(
0, true);
}
}).bind(
"search", function() {
// TODO why not just specifying both arguments?
var fn = (arguments.length > 1) ? arguments[1] : null;
function findValueCallback(q, data) {
var result;
if( data && data.length ) {
for (var i=0; i < data.length; i++) {
if( data[i].result.toLowerCase() == q.toLowerCase() ) {
result
= data[i];
break;
}
}
}
if( typeof fn == "function" ) fn(result);
else $input.trigger("result", result && [result.data, result.value]);
}
$.each(trimWords($input.val()), function(i, value) {
request(value, findValueCallback, findValueCallback);
});
}).bind(
"flushCache", function() {
cache.flush();
}).bind(
"setOptions", function() {
$.extend(options, arguments[
1]);
// if we've updated the data, repopulate
if ( "data" in arguments[1] )
cache.populate();
}).bind(
"unautocomplete", function() {
select.unbind();
$input.unbind();
$(input.form).unbind(
".autocomplete");
});


function selectCurrent() {
var selected
= select.selected();
if( !selected )
return false;

var v
= selected.result;
previousValue
= v;

if ( options.multiple ) {
var words
= trimWords($input.val());
if ( words.length > 1 ) {
var seperator
= options.multipleSeparator.length;
var cursorAt
= $(input).selection().start;
var wordAt, progress
= 0;
$.each(words, function(i, word) {
progress
+= word.length;
if (cursorAt <= progress) {
wordAt
= i;
return false;
}
progress
+= seperator;
});
words[wordAt]
= v;
// TODO this should set the cursor to the right position, but it gets overriden somewhere
//$.Autocompleter.Selection(input, progress + seperator, progress + seperator);
v = words.join( options.multipleSeparator );
}
v
+= options.multipleSeparator;
}

$input.val(v);
hideResultsNow();
$input.trigger(
"result", [selected.data, selected.value]);
return true;
}

function onChange(crap, skipPrevCheck) {
if( lastKeyPressCode == KEY.DEL ) {
select.hide();
return;
}

var currentValue
= $input.val();

if ( !skipPrevCheck && currentValue == previousValue )
return;

previousValue
= currentValue;

currentValue
= lastWord(currentValue);
if ( currentValue.length >= options.minChars) {
$input.addClass(options.loadingClass);
if (!options.matchCase)
currentValue
= currentValue.toLowerCase();
request(currentValue, receiveData, hideResultsNow);
}
else {
stopLoading();
select.hide();
}
};

function trimWords(value) {
if (!value)
return [""];
if (!options.multiple)
return [$.trim(value)];
return $.map(value.split(options.multipleSeparator), function(word) {
return $.trim(value).length ? $.trim(word) : null;
});
}

function lastWord(value) {
if ( !options.multiple )
return value;
var words
= trimWords(value);
if (words.length == 1)
return words[0];
var cursorAt
= $(input).selection().start;
if (cursorAt == value.length) {
words
= trimWords(value)
}
else {
words
= trimWords(value.replace(value.substring(cursorAt), ""));
}
return words[words.length - 1];
}

// fills in the input box w/the first match (assumed to be the best match)
// q: the term entered
// sValue: the first matching result
function autoFill(q, sValue){
// autofill in the complete box w/the first match as long as the user hasn't entered in more data
// if the last user key pressed was backspace, don't autofill
if( options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE ) {
// fill in the value (keep the case the user has typed)
$input.val($input.val() + sValue.substring(lastWord(previousValue).length));
// select the portion of the value not typed by the user (so the next character will erase)
$(input).selection(previousValue.length, previousValue.length + sValue.length);
}
};

function hideResults() {
clearTimeout(timeout);
timeout
= setTimeout(hideResultsNow, 200);
};

function hideResultsNow() {
var wasVisible
= select.visible();
select.hide();
clearTimeout(timeout);
stopLoading();
if (options.mustMatch) {
// call search and run callback
$input.search(
function (result){
// if no value found, clear the input box
if( !result ) {
if (options.multiple) {
var words
= trimWords($input.val()).slice(0, -1);
$input.val( words.join(options.multipleSeparator)
+ (words.length ? options.multipleSeparator : "") );
}
else {
$input.val(
"" );
$input.trigger(
"result", null);
}
}
}
);
}
};

function receiveData(q, data) {
if ( data && data.length && hasFocus ) {
stopLoading();
select.display(data, q);
autoFill(q, data[
0].value);
select.show();
}
else {
hideResultsNow();
}
};

function request(term, success, failure) {
if (!options.matchCase)
term
= term.toLowerCase();
var data
= cache.load(term);
// recieve the cached data
if (data && data.length) {
success(term, data);
// if an AJAX url has been supplied, try loading the data now
} else if( (typeof options.url == "string") && (options.url.length > 0) ){

var extraParams
= {
timestamp:
+new Date()
};
$.each(options.extraParams, function(key, param) {
extraParams[key]
= typeof param == "function" ? param() : param;
});

$.ajax({
// try to leverage ajaxQueue plugin to abort previous requests
mode: "abort",
// limit abortion to this input
port: "autocomplete" + input.name,
dataType: options.dataType,
url: options.url,
data: $.extend({
q: lastWord(term),
limit: options.max
}, extraParams),
success: function(data) {
var parsed
= options.parse && options.parse(data) || parse(data);
cache.add(term, parsed);
success(term, parsed);
}
});
}
else {
// if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
select.emptyList();
failure(term);
}
};

function parse(data) {
var parsed
= [];
var rows
= data.split("\n");
for (var i=0; i < rows.length; i++) {
var row
= $.trim(rows[i]);
if (row) {
row
= row.split("|");
parsed[parsed.length]
= {
data: row,
value: row[
0],
result: options.formatResult
&& options.formatResult(row, row[0]) || row[0]
};
}
}
return parsed;
};

function stopLoading() {
$input.removeClass(options.loadingClass);
};

};

$.Autocompleter.defaults
= {
inputClass:
"ac_input",
resultsClass:
"ac_results",
loadingClass:
"ac_loading",
minChars:
1,
delay:
400,
matchCase:
false,
matchSubset:
true,
matchContains:
false,
cacheLength:
10,
max:
100,
mustMatch:
false,
extraParams: {},
selectFirst:
true,
formatItem: function(row) {
return row[0]; },
formatMatch:
null,
autoFill:
false,
width:
0,
multiple:
false,
multipleSeparator:
", ",
highlight: function(value, term) {
return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>");
},
scroll:
true,
scrollHeight:
180
};

$.Autocompleter.Cache
= function(options) {

var data
= {};
var length
= 0;

function matchSubset(s, sub) {
if (!options.matchCase)
s
= s.toLowerCase();
var i
= s.indexOf(sub);
if (options.matchContains == "word"){
i
= s.toLowerCase().search("\\b" + sub.toLowerCase());
}
if (i == -1) return false;
return i == 0 || options.matchContains;
};

function add(q, value) {
if (length > options.cacheLength){
flush();
}
if (!data[q]){
length
++;
}
data[q]
= value;
}

function populate(){
if( !options.data ) return false;
// track the matches
var stMatchSets = {},
nullData
= 0;

// no url was specified, we need to adjust the cache length to make sure it fits the local data store
if( !options.url ) options.cacheLength = 1;

// track all options for minChars = 0
stMatchSets[""] = [];

// loop through the array and create a lookup structure
for ( var i = 0, ol = options.data.length; i < ol; i++ ) {
var rawValue
= options.data[i];
// if rawValue is a string, make an array otherwise just reference the array
rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;

var value
= options.formatMatch(rawValue, i+1, options.data.length);
if ( value === false )
continue;

var firstChar
= value.charAt(0).toLowerCase();
// if no lookup array for this character exists, look it up now
if( !stMatchSets[firstChar] )
stMatchSets[firstChar]
= [];

// if the match is a string
var row = {
value: value,
data: rawValue,
result: options.formatResult
&& options.formatResult(rawValue) || value
};

// push the current match into the set list
stMatchSets[firstChar].push(row);

// keep track of minChars zero items
if ( nullData++ < options.max ) {
stMatchSets[
""].push(row);
}
};

// add the data items to the cache
$.each(stMatchSets, function(i, value) {
// increase the cache size
options.cacheLength++;
// add to the cache
add(i, value);
});
}

// populate any existing data
setTimeout(populate, 25);

function flush(){
data
= {};
length
= 0;
}

return {
flush: flush,
add: add,
populate: populate,
load: function(q) {
if (!options.cacheLength || !length)
return null;
/*
* if dealing w/local data and matchContains than we must make sure
* to loop through all the data collections looking for matches
*/
if( !options.url && options.matchContains ){
// track all matches
var csub = [];
// loop through all the data grids for matches
for( var k in data ){
// don't search through the stMatchSets[""] (minChars: 0) cache
// this prevents duplicates
if( k.length > 0 ){
var c
= data[k];
$.each(c, function(i, x) {
// if we've got a match, add it to the array
if (matchSubset(x.value, q)) {
csub.push(x);
}
});
}
}
return csub;
}
else
// if the exact item exists, use it
if (data[q]){
return data[q];
}
else
if (options.matchSubset) {
for (var i = q.length - 1; i >= options.minChars; i--) {
var c
= data[q.substr(0, i)];
if (c) {
var csub
= [];
$.each(c, function(i, x) {
if (matchSubset(x.value, q)) {
csub[csub.length]
= x;
}
});
return csub;
}
}
}
return null;
}
};
};

$.Autocompleter.Select
= function (options, input, select, config) {
var CLASSES
= {
ACTIVE:
"ac_over"
};

var listItems,
active
= -1,
data,
term
= "",
needsInit
= true,
element,
list;

// Create results
function init() {
if (!needsInit)
return;
element
= $("<div/>")
.hide()
.addClass(options.resultsClass)
.css(
"position", "absolute")
.appendTo(document.body);

list
= $("<ul/>").appendTo(element).mouseover( function(event) {
if(target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
active
= $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
$(target(
event)).addClass(CLASSES.ACTIVE);
}
}).click(function(
event) {
$(target(
event)).addClass(CLASSES.ACTIVE);
select();
// TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus
input.focus();
return false;
}).mousedown(function() {
config.mouseDownOnSelect
= true;
}).mouseup(function() {
config.mouseDownOnSelect
= false;
});

if( options.width > 0 )
element.css(
"width", options.width);

needsInit
= false;
}

function target(
event) {
var element
= event.target;
while(element && element.tagName != "LI")
element
= element.parentNode;
// more fun with IE, sometimes event.target is empty, just ignore it then
if(!element)
return [];
return element;
}

function moveSelect(step) {
listItems.slice(active, active
+ 1).removeClass(CLASSES.ACTIVE);
movePosition(step);
var activeItem
= listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
if(options.scroll) {
var offset
= 0;
listItems.slice(
0, active).each(function() {
offset
+= this.offsetHeight;
});
if((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) {
list.scrollTop(offset
+ activeItem[0].offsetHeight - list.innerHeight());
}
else if(offset < list.scrollTop()) {
list.scrollTop(offset);
}
}
};

function movePosition(step) {
active
+= step;
if (active < 0) {
active
= listItems.size() - 1;
}
else if (active >= listItems.size()) {
active
= 0;
}
}

function limitNumberOfItems(available) {
return options.max && options.max < available
? options.max
: available;
}

function fillList() {
list.empty();
var max
= limitNumberOfItems(data.length);
for (var i=0; i < max; i++) {
if (!data[i])
continue;
var formatted
= options.formatItem(data[i].data, i+1, max, data[i].value, term);
if ( formatted === false )
continue;
var li
= $("<li/>").html( options.highlight(formatted, term) ).addClass(i%2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
$.data(li,
"ac_data", data[i]);
}
listItems
= list.find("li");
if ( options.selectFirst ) {
listItems.slice(
0, 1).addClass(CLASSES.ACTIVE);
active
= 0;
}
// apply bgiframe if available
if ( $.fn.bgiframe )
list.bgiframe();
}

return {
display: function(d, q) {
init();
data
= d;
term
= q;
fillList();
},
next: function() {
moveSelect(
1);
},
prev: function() {
moveSelect(
-1);
},
pageUp: function() {
if (active != 0 && active - 8 < 0) {
moveSelect(
-active );
}
else {
moveSelect(
-8);
}
},
pageDown: function() {
if (active != listItems.size() - 1 && active + 8 > listItems.size()) {
moveSelect( listItems.size()
- 1 - active );
}
else {
moveSelect(
8);
}
},
hide: function() {
element
&& element.hide();
listItems
&& listItems.removeClass(CLASSES.ACTIVE);
active
= -1;
},
visible : function() {
return element && element.is(":visible");
},
current: function() {
return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
},
show: function() {
var offset
= $(input).offset();
element.css({
width:
typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
top: offset.top
+ input.offsetHeight,
left: offset.left
}).show();
if(options.scroll) {
list.scrollTop(
0);
list.css({
maxHeight: options.scrollHeight,
overflow:
'auto'
});

if($.browser.msie && typeof document.body.style.maxHeight === "undefined") {
var listHeight
= 0;
listItems.each(function() {
listHeight
+= this.offsetHeight;
});
var scrollbarsVisible
= listHeight > options.scrollHeight;
list.css(
'height', scrollbarsVisible ? options.scrollHeight : listHeight );
if (!scrollbarsVisible) {
// IE doesn't recalculate width when scrollbar disappears
listItems.width( list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")) );
}
}

}
},
selected: function() {
var selected
= listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
return selected && selected.length && $.data(selected[0], "ac_data");
},
emptyList: function (){
list
&& list.empty();
},
unbind: function() {
element
&& element.remove();
}
};
};

$.fn.selection
= function(start, end) {
if (start !== undefined) {
return this.each(function() {
if( this.createTextRange ){
var selRange
= this.createTextRange();
if (end === undefined || start == end) {
selRange.move(
"character", start);
selRange.select();
}
else {
selRange.collapse(
true);
selRange.moveStart(
"character", start);
selRange.moveEnd(
"character", end);
selRange.select();
}
}
else if( this.setSelectionRange ){
this.setSelectionRange(start, end);
}
else if( this.selectionStart ){
this.selectionStart = start;
this.selectionEnd = end;
}
});
}
var field
= this[0];
if ( field.createTextRange ) {
var range
= document.selection.createRange(),
orig
= field.value,
teststring
= "<->",
textLength
= range.text.length;
range.text
= teststring;
var caretAt
= field.value.indexOf(teststring);
field.value
= orig;
this.selection(caretAt, caretAt + textLength);
return {
start: caretAt,
end: caretAt
+ textLength
}
}
else if( field.selectionStart !== undefined ){
return {
start: field.selectionStart,
end: field.selectionEnd
}
}
};

})(jQuery);

需要说明的是:我们这里会引如jquery的包.
    <script type="text/javascript" src="http://www.cnblogs.com/Scripts/jquery-1.4.1.min.js"></script>     <script type="text/javascript" src="http://www.cnblogs.com/Scripts/jquery-1.4.1.js"></script>
开始我们的第二步:
建立默认的工程.详细步骤省略.来到我们的HomeController
public ActionResult Find(string q) 
        { 
            if (q == null) q = "";
            var a = from b in db.Orders
                    where b.CustomerID.IndexOf(q)>-1
                    select (b.CustomerID);
            if (a.Count()==0)
            {
                a = from b in db.Orders
                    where b.CustomerID.Contains(q)
                    select (b.CustomerID);
            }
            return Content(String.Join("\r\n",a.Take(10))); 
        }

我们添加这个Controller 这里我们用于实现查询
var a = from b in db.Orders                    where b.CustomerID.IndexOf(q)>-1                    select (b.CustomerID);IndexOf(q)>-1我们通过变量q来查询首个string等于q(当然 这里可以是数字 中文  字符 等等).
我们通过a的返回数量来判断是否首个字母包含q的数据  如果未发现 我们则会通过Contains来模糊查询数据任何地方涵有q的数据最后 我们把数据传递回去
 最后我们来个view的代码  这里就非常简单了
<div> 
    <%= Html.TextBox("city")%> 
  </div> 
<script type="text/javascript"> 
    $(function() {
    $("#city").autocomplete('<%= Url.Action("Find", "Home") %>'); 
    }); 
</script>

当然 我这里的view是指index.
很简单.我们就这样完成了这个自动完成的功能
大家端午节快乐

posted @ 2010-06-07 10:55  zilchwei  阅读(2387)  评论(15编辑  收藏  举报