MVC 3 基本操作列表分页查询
Mvc3中默认提供了一个WebGrid扩展方法,这个方法实现列表功能是非常的强大,但是的asp.net中的GridView一样,它的分页查询都是基于内存的,这样对服务器的性能影响就比较大,在网上也看到很实现分页的代码,但能运行起来的也是很有限,根据最近这段时间的学习,作一个学习笔记。
生成效果如下(使用了MVCPager):
此分页是通过jquery异步调用生成的,下面来看看怎样达到这样的效果:
还是打开上次准备好的项目,引用MvcPager程序集,最好从网站上下载最新的代码自己编译,下载地址为“http://www.webdiyer.com/Controls/MvcPager/”,我当时就遇到过下载到的dll引用的MVC的版本和我本地的不一样,上面使用的MVCPager,我修改了一下输出的地址,如下所示:
调用了自定义的函数(“LoadMvcPage”),修改过程如下:
打开MvcPager中PageBuiler.cs文件,修改函数“GeneratePagerElement,GenerateAnchor”为如下内容:
1: private string GenerateAnchor(PagerItem item)
2: {
3:
4: return GeneratePagerElement(item).ToHtmlString();
5: }
6: private MvcHtmlString GeneratePagerElement(PagerItem item)
7: {
8: //pager item link
9: string url = GenerateUrl(item.PageIndex);
10: if (item.Disabled) //first,last,next or previous page
11: return CreateWrappedPagerElement(item, String.Format("<a disabled=\"disabled\">{0}</a>", item.Text));
12: return CreateWrappedPagerElement(item,
13: string.IsNullOrEmpty(url)
14: ? _html.Encode(item.Text)
15: : String.Format("<a href=\"javascript:{2}('{0}');\">{1}</a>", url, item.Text,loadPageAction));
16: }
修改HomeConroller下的List Action为如下内容:
1: [OutputCache(Duration = 0)]
2: public ActionResult List(int? page)
3: {
4: int current = 1;
5: if (page != null)
6: {
7: current = page.Value;
8: }
9: var manager = new NoteManager();
10: Collection<Note> data = manager.GetAll();
11: var list = new PagedList<Note>(data.Skip((current - 1) * 4).Take(4), current, 4, data.Count);
12: return PartialView(list);
13: }
修改Common.js文件内容为:
1: var Success = 0;
2: var AlertError = 2;
3: function DialogObject(dialogId, formId, addUrl, editUrl, saveUrl, ajaxPostFunction, loadSuccessCallBack) {
4: this._dialogId = "#" + dialogId;
5: this._formId = "#" + formId;
6: this._saveUrl = saveUrl;
7: this._addUrl = addUrl;
8: this._editUrl = editUrl;
9: this._ajaxPostFunction = ajaxPostFunction;
10: this._loadSuccessCallBack = loadSuccessCallBack;
11: };
12:
13: DialogObject.prototype.dialogLoad = function (width, height, modal) {
14: $(this._dialogId).dialog({
15: autoOpen: false, //对话框的是否自动打开
16: width: width, //宽高
17: height: height,
18: modal: modal == undefined ? true : modal, //模态对话框
19: buttons: {//自定义对话框的按钮信息
20: "保存": this._ajaxPostFunction,
21: "返回": this._closedialog()
22: }
23: });
24: };
25: DialogObject.prototype.loadEdit = function (id) {
26:
27: $(this._dialogId).html("")
28: .dialog("option", "title", "编辑")
29: .load(this._editUrl + "/" + id, this._openDialog());
30:
31: };
32: DialogObject.prototype.loadAdd = function () {
33: $(this._dialogId).html("")
34: .dialog("option", "title", "新增")
35: .load(this._addUrl, this._openDialog());
36: };
37: DialogObject.prototype._openDialog = function () {
38: return new Function("$('" + this._dialogId + "').dialog('open');");
39: };
40: DialogObject.prototype._closedialog = function () {
41: return new Function("$('" + this._dialogId + "').dialog('close');");
42: };
43:
44: DialogObject.prototype.checkFormData = function () {
45: var b = $(this._formId);
46: b.submit();
47: if (b.validate().numberOfInvalids() > 0) {
48: return false;
49: }
50:
51: return true;
52: };
53:
54: DialogObject.prototype.defaultAjaxPostFunction = function () {
55: if (!this.checkFormData()) {
56: return;
57: }
58: this._postFunction($(this._formId).serialize(), function (dlgObject, formObject, data, dlg) {
59: if (data.Success == true) {
60: dlgObject.dialog("close");
61: if (dlg._loadSuccessCallBack != null) {
62: dlg._loadSuccessCallBack();
63: }
64: }
65: // else if (data.Success == AlertError) {
66: // alert(data.data);
67: // }
68: // else {
69: // formObject.html(data.data);
70: // }
71: }, this);
72: };
73: DialogObject.prototype.postFunction = function (formData, successCallback) {
74: this._postFunction(formData, successCallback, this);
75: };
76:
77: DialogObject.prototype._postFunction = function (formData, successCallback, dlg) {
78: $.post(dlg._saveUrl,
79: formData,
80: function (data, textStatus) {
81: switch (textStatus) {
82: case
83: "timeout":
84: break;
85: case "error":
86: break;
87: case "notmodified":
88: break;
89: case "success":
90: successCallback($(dlg._dialogId), $(dlg._formId), data, dlg);
91: break;
92: case "parsererror":
93: break;
94: default:
95: break;
96: }
97:
98: });
99:
100: };
修改List视图为如下内容:
1: @using Webdiyer.WebControls.Mvc
2: @model PagedList<MvcSample.Models.Note>
3: <ul class="NotesList">
4: @foreach (var note in Model)
5: {
6: <li> @note.Title <br /> @note.Body <br />
7: <span class="EditLink" noteid="@note.Id">Edit</span>
8: </li>
9: }
10: </ul>
11:
12: <br />
13: @*分页控件显示的地方一定要放在刷新的div里面,不然会出现双重控件*@
14: <div style="text-align:right;">
15: @Html.AjaxPager(Model, new PagerOptions()
16: { PageIndexParameterName = "page", ShowDisabledPagerItems = true,
17: AlwaysShowFirstLastPageNumber = true, CssClass = "pages" },
18: new AjaxOptions { UpdateTargetId = "NoteListBlock" })</div>
修改Index视图为如下内容:
1: @{
2: ViewBag.Title = "Home Page";
3: }
4: <h2>
5: Notes</h2>
6: <div id="NoteListBlock">
7: </div>
8: <span class="AddLink">Add New Note</span>
9: <div id="NoteDialog" title="" class="Hidden">
10: </div>
11: <script src="@Url.Content("~/Scripts/Common.js?verion=1")" type="text/javascript"></script>1:
2: <script type="text/javascript">3: var noteDialog = new DialogObject("NoteDialog", "NoteForm", "/Home/Create", "/Home/Edit", "/Home/Save", ajaxPostFunctionModel, LoadList);4: $(function() {5: noteDialog.dialogLoad(440,330);
6: $(".EditLink").live("click", function () {7: var id = $(this).attr("noteid");8: noteDialog.loadEdit(id);
9: });
10: $(".AddLink").click(function () {11: noteDialog.loadAdd();
12: });
13:
14: LoadList();
15: });
16: function ajaxPostFunctionModel() {17: noteDialog.defaultAjaxPostFunction();
18: }
19:
20: function LoadList() {21: LoadMvcPage("/Home/List");22: }
23:
24: function AddRecord() {25: noteDialog.loadAdd();
26: return false;27: }
28:
29: function LoadMvcPage(url) {30: $("#NoteListBlock").load(url);31: }
</script>
到此所有的修改完成,如果完全按照上面的做,就能看页面开始图片的效果。