小程序商城模板_使用JQuery主动完成插件Auto Comp

问题

当你查找一些特殊的东西，当你输入准确的词时，找到它可能是困难的（或者很耗时）。在输入的时候展示出结果（自动完成），使查找变得更简单。

解决方案

使用JQuery自动完成插件，更新现有图书列表页面上的搜索，当用户键入的时候立即显示结果。

讨论

自动完成插件是不会象jQuery基本库一样自动包含在MVC项目中的，所以需要做的第一件事就是的是下载插件
访问。两个主要的文件是必需的：JavaScript文件和CSS文件。把新下载的javascript文件放到你MVC应用程序的script 文件夹下。CSS文件可以直接添加到您的content目录。

这个配方也将介绍在view中使用 rendering sections。在shared文件夹下layout中自动添加了2个javascript文件和1个css文件。这些是Ajax和不唐突的Ajax和网站主css文件。每次加载的内容越多，页面视图加载越慢。与其在每个页面都去包含可能不必要的javascript和css 文件，不如在layout中添加一个新的RenderSection()。这允许特别的view在 head 标签去加载特别的javascript或css，但不是每页都添加他们。

下边是一个更新后的Views/Shared/_Layout.cshtml，他使用了一个新的RenderSection（）。

 !DOCTYPE html 
 html 
 head 
 title _Mobile /title 
 link href="@Url.Content(" rel="external nofollow" rel="external nofollow" ~/Content/Site.css")" rel="stylesheet" type="text/css" / 
 script src="@Url.Content("~/Scripts/jquery-1.6.2.min.js")" type="text/javascript" /script 
 script type="text/javascript" 
$(document).ready(function () {
if (window.innerWidth = 480) {
$("link[rel=stylesheet]").attr({ href: "@Url.Content("~/Content/jquery.mobile-1.0b1.min.css")" });
 /script 
@RenderSection("JavaScriptAndCSS", required: false)
 /head 
 body 
 div data-role="page" 
 div id="header" data-role="header" 
 div id="title" 
 h1 My MVC Application /h1 
 /div 
 div id="logindisplay" 
@Html.Partial("_LogOnPartial")
[ @Html.ActionLink("English", "ChangeLanguage", "Home", new { language = "en" }, null) ]
[ @Html.ActionLink("Fran ais", "ChangeLanguage", "Home", new { language = "fr" }, null) ]
 /div 
 div id="menucontainer" 
 ul id="menu" 
 li @Html.ActionLink("Home", "Index", "Home", null, new Dictionary string, object {{ "data-role", "button" }}) /li 
 li @Html.ActionLink("About", "About", "Home", null, new Dictionary string, object { { "data-role", "button" }}) /li 
 /ul 
 /div 
 /div 
 div id="main" data-role="content" 
@RenderBody()
 /div 
 div id="footer" data-role="footer" 
 /div 
 /div 
 /body 
 /html 

主要的CSS文件和核心的JQuery文件被留下来了，因为css在每个也都需要，并且绝大多数网页也需要JQuery。然而新的JQuery文件和不唐突的AJAX不是每个页面都需要的。

plete 插件：

1.在javascript中设置要搜索的数据。

2.当用户输入时通过ajax检索。

在我使用这个插件的经验看来，我发现使用解决方案1时自动完成更快。因为它并不需要每次从数据库中请求数据。然而，使用这种解决方案的限制：只有这么多字符，可传递到function中，大量的JavaScript可能会导致用户的计算机上页面加载缓慢。经过一些试验和错误，我已经确定神奇的数字是大约40,000个结果。如果结果数量超过此，最好使用选项2;否则，始终坚持，因为搜索选项1是瞬时，而不是有轻微的延迟。

在这个例子中，将搜索书籍，我们没有超过40000，所以将使用选项1。BooksController现在必须更新，以设置ViewBag为book title。自动完成功能需要支持一个JavaScript数组的支持，所以书将管道（|）分开。然后在view中，书将被转换到一个数组，使用JavaScript的split（）函数。当用户完成键入他们的结果，他们应该有选择完全匹配标题，因此这个函数将被更新。如果只有1本书返回并且用户执行了搜索，它会自动重定向到本书详细介绍页面。

我们要在bookcontroller 中更新Index Action plete。

代码如下：

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Linq.Dynamic;
using System.Web;
using System.Web.Mvc;
using MvcApplication.Models;
using MvcApplication.Utils;
using PagedList;
namespace MvcApplication.Controllers
public class BooksController : Controller
private BookDBContext db = new BookDBContext();
// GET: /Books/
[OutputCache(Duration = Int32.MaxValue, SqlDependency = "MvcApplication.Models.BookDBContext:books", VaryByParam = "sortOrder;filter;page")]
public ActionResult Index(string sortOrder, string filter, string Keyword, int page = 1)
#region ViewBag Resources
ViewBag.Title = Resources.Resource1.BookIndexTitle;
ViewBag.CreateLink = Resources.Resource1.CreateLink;
ViewBag.TitleDisplay = Resources.Resource1.TitleDisplay;
ViewBag.IsbnDisplay = Resources.Resource1.IsbnDisplay;
ViewBag.SummaryDisplay = Resources.Resource1.SummaryDisplay;
ViewBag.AuthorDisplay = Resources.Resource1.AuthorDisplay;
ViewBag.ThumbnailDisplay = Resources.Resource1.ThumbnailDisplay;
ViewBag.PriceDisplay = Resources.Resource1.PriceDisplay;
ViewBag.PublishedDisplay = Resources.Resource1.PublishedDisplay;
ViewBag.EditLink = Resources.Resource1.EditLink;
ViewBag.DetailsLink = Resources.Resource1.DetailsLink;
ViewBag.DeleteLink = Resources.Resource1.DeleteLink;
#endregion
#region ViewBag Sort Params
ViewBag.TitleSortParam = (sortOrder == "Title") "Title desc" : "Title";
ViewBag.IsbnSortParam = (sortOrder == "Isbn") "Isbn desc" : "Isbn";
ViewBag.AuthorSortParam = (sortOrder == "Author") "Author desc" : "Author";
ViewBag.PriceSortParam = (sortOrder == "Price") "Price desc" : "Price";
ViewBag.PublishedSortParam = (String.IsNullOrEmpty(sortOrder)) "Published desc" : "";
// Default the sort order
if (String.IsNullOrEmpty(sortOrder))
sortOrder = "Published desc";
ViewBag.CurrentSortOrder = sortOrder;
#endregion
var books = from b in db.Books select b;
#region Keyword Search
if (!String.IsNullOrEmpty(Keyword))
books = books.Where(b = b.Title.ToUpper().Contains(Keyword.ToUpper()) || b.Author.ToUpper().Contains(Keyword.ToUpper()));
// Should we redirect because of only one result 
if (books.Count() == 1)
Book book = books.First();
return RedirectToAction("Details", new { id = book.ID });
ViewBag.CurrentKeyword = String.IsNullOrEmpty(Keyword) "" : Keyword;
#endregion
#region Filter switch
switch (filter)
case "NewReleases":
var startDate = DateTime.Today.AddDays(-14);
books = books.Where(b = b.Published = DateTime.Today.Date 
 b.Published = startDate
break;
case "ComingSoon":
books = books.Where(b = b.Published DateTime.Today.Date);
break;
default:
// No filter needed
break;
ViewBag.CurrentFilter = String.IsNullOrEmpty(filter) "" : filter;
#endregion
books = books.OrderBy(sortOrder);
int maxRecords = 1;
int currentPage = page - 1;
// Get all book titles
ViewBag.BookTitles = plete();
return View(books.ToPagedList(currentPage, maxRecords));
private plete()
string bookTitles = String.Empty;
var books = from b in db.Books select b;
foreach (Book book in books)
if (bookTitles.Length 0)
bookTitles += "|";
bookTitles += book.Title;
return bookTitles;
// GET: /Books/Details/5
public ActionResult Details(int id = 0, string bookTitle = "")
Book book = db.Books.Find(id);
return View(book);
// GET: /Books/Create
public ActionResult Create()
return View();
// POST: /Books/Create
[HttpPost]
public ActionResult Create(Book book, HttpPostedFileBase file)
if (ModelState.IsValid)
// Upload our file
book.Thumbnail = FileUpload.UploadFile(file);
db.Books.Add(book);
db.SaveChanges();
return RedirectToAction("Index"); 
return View(book);
// GET: /Books/Edit/5
public ActionResult Edit(int id)
Book book = db.Books.Find(id);
return View(book);
// POST: /Books/Edit/5
[HttpPost]
public ActionResult Edit(Book book, HttpPostedFileBase file)
if (ModelState.IsValid)
// Delete old file
FileUpload.DeleteFile(book.Thumbnail);
// Upload our file
book.Thumbnail = FileUpload.UploadFile(file);
db.Entry(book).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
return View(book);
// GET: /Books/Delete/5
public ActionResult Delete(int id)
Book book = db.Books.Find(id);
return View(book);
// POST: /Books/Delete/5
[HttpPost, ActionName("Delete")]
public ActionResult DeleteConfirmed(int id)
Book book = db.Books.Find(id);
// Delete old file
FileUpload.DeleteFile(book.Thumbnail);
db.Books.Remove(book);
db.SaveChanges();
return RedirectToAction("Index");
protected override void Dispose(bool disposing)
db.Dispose();
base.Dispose(disposing);
}

最后book/index view需要更新去初始化jQuery的自动完成。。接下来，以前创建的搜索文本框更新设置一个键的IDwordSearch。

最后，JavaScript代码添加在视图的底部去在搜索文本框上建立自动完成功能。此JavaScript是有意添加在view的底部，以确保完全呈现给用户，因为在用户的电脑上建立数据是一项工作，Javascript处理可能会“堵塞”页面加载。

（译者：先呈现数据再执行javascript，js不是像传统那样放在head标签里）

这取决于结果的数量。代码如下：

@model PagedList.IPagedList MvcApplication.Models.Book 
@if (IsAjax)
Layout = null;
@section JavascriptAndCSS {
 link rel="stylesheet" href="@Url.Content(" rel="external nofollow" rel="external nofollow" ~/Content/plete.css")" type="text/css" / 
 script type="text/javascript" src="@Url.Content("~/Scripts/plete.js")" /script 
 script src="@Url.Content("~/Scripts/jquery.unobtrusive-ajax.min.js")" type="text/javascript" /script 
 h2 @MvcApplication4.Resources.Resource1.BookIndexTitle /h2 
@Html.ActionLink("Create New", "Create")
Show:
@if (ViewBag.CurrentFilter != "")
@Ajax.ActionLink("All", "Index", new { sortOrder = ViewBag.CurrentSortOrder, Keyword = ViewBag.CurrentKeyword }, new AjaxOptions { UpdateTargetId = "main" })
@:All
 nbsp; | nbsp;
@if (ViewBag.CurrentFilter != "NewReleases")
@Ajax.ActionLink("New Releases", "Index", new { filter = "NewReleases", sortOrder = ViewBag.CurrentSortOrder, Keyword = ViewBag.CurrentKeyword }, new AjaxOptions { UpdateTargetId = "main" })
@:New Releases
 nbsp; | nbsp;
@if (ViewBag.CurrentFilter != "ComingSoon")
@Ajax.ActionLink("Coming Soon", "Index", new { filter = "ComingSoon", sortOrder = ViewBag.CurrentSortOrder, Keyword = ViewBag.CurrentKeyword }, new AjaxOptions { UpdateTargetId = "main" })
@:Coming Soon
@using (Html.BeginForm())
@:Search: @Html.TextBox("Keyword", (string)ViewBag.CurrentKeyword, new { id = "KeywordSearch" }) input type="submit" value="Search" / 
@Html.Partial("_Paging")
 table 
@Ajax.ActionLink("Title", "Index", new { sortOrder = ViewBag.TitleSortParam, filter = ViewBag.CurrentFilter, Keyword = ViewBag.CurrentKeyword }, new AjaxOptions { UpdateTargetId = "main" })
 /th 
@Ajax.ActionLink("Isbn", "Index", new { sortOrder = ViewBag.IsbnSortParam, filter = ViewBag.CurrentFilter, Keyword = ViewBag.CurrentKeyword }, new AjaxOptions { UpdateTargetId = "main" })
 /th 
Summary
 /th 
@Ajax.ActionLink("Author", "Index", new { sortOrder = ViewBag.AuthorSortParam, filter = ViewBag.CurrentFilter, Keyword = ViewBag.CurrentKeyword }, new AjaxOptions { UpdateTargetId = "main" })
 /th 
Thumbnail
 /th 
@Ajax.ActionLink("Price", "Index", new { sortOrder = ViewBag.PriceSortParam, filter = ViewBag.CurrentFilter, Keyword = ViewBag.CurrentKeyword }, new AjaxOptions { UpdateTargetId = "main" })
 /th 
@Ajax.ActionLink("Published", "Index", new { sortOrder = ViewBag.PublishedSortParam, filter = ViewBag.CurrentFilter, Keyword = ViewBag.CurrentKeyword }, new AjaxOptions { UpdateTargetId = "main" })
 /th 
 th /th 
 /tr 
@foreach (var item in Model)
@Html.DisplayFor(modelItem = item.Title)
 /td 
@Html.DisplayFor(modelItem = item.Isbn)
 /td 
@Html.DisplayFor(modelItem = item.Summary)
 /td 
@Html.DisplayFor(modelItem = item.Author)
 /td 
@Html.DisplayFor(modelItem = item.Thumbnail)
 /td 
@Html.DisplayFor(modelItem = item.Price)
 /td 
@Html.DisplayFor(modelItem = item.Published)
 /td 
@Html.ActionLink("Edit", "Edit", new { id = item.ID }) |
@Html.ActionLink("Details", "Details", new { id = item.ID }) |
@Html.ActionLink("Delete", "Delete", new { id = item.ID })
 /td 
 /tr 
 /table 
@Html.Partial("_Paging")
 script type="text/javascript" 
$(document).ready(function () {
var data = "@ViewBag.BookTitles".split("|");
$("#KeywordSearch").plete(data);
 /script 

为了实施选项2，一个Ajax搜索，而不是传递数据数组到自动完成函数，您可以传递一个URL。URL将需要接受查询字符串变量：q。这包含用户输入的搜索值。这将用于执行书本上包含部分匹配的搜索，并返回以分隔符分隔的字符串。JQuery文档中含有较多的这样的成品例子，也有其他的例子，去更新的输出结果（可能包括书的封面的缩略图）。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持凡科。