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;

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

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 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;

$.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 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;
}

}
},
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

转载于:https://www.cnblogs.com/ZilchWei/archive/2010/06/07/1753028.html

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