[英]in jQuery/JavaScript how do I exit a for loop when specific conditions are met
[英]How do I cause a javascript visual effect from a controller when specific conditions are met?
我目前正在編寫一個ASP.MVC應用程序。 我幾乎完成了。 我現在正在做網站的外觀。 問題是我的視圖中有一段JavaScript,當滿足特定條件時,我想從控制器中調用它。
這是代碼示例。
MenuController.cs:
[HttpPost]
public ActionResult Create(FormCollection collection,Models.Menu sentData)
{
try
{
// TODO: Add insert logic here
//db.Menus.AddObject(sentData);
int existingQuery = (from m in db.Menus where m.Weekstart == Helper.GetNextMonday() && m.category == sentData.category select m).Count();
if (existingQuery > 0)
{
throw new Exception();
}
Models.Menu MenuItem = new Models.Menu
{
Monday = sentData.Monday,
Wednesday = sentData.Wednesday,
Friday = sentData.Friday,
category = sentData.category,
Weekstart = Helper.GetNextMonday(),
};
db.SaveChanges();
return RedirectToAction("Index");
}
catch
{
//Javascript visual here
return View();
}
}
這是此方法的創建視圖。
/菜單/Create.aspx
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<Lunch_Ordering_Application.Models.Menu>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Create
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<h2>
Create</h2>
<% using (Html.BeginForm())
{%>
<%: Html.ValidationSummary(true) %>
<fieldset>
<div class="editor-label">
<%: Html.LabelFor(model => model.Monday) %>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Monday) %>
<%: Html.ValidationMessageFor(model => model.Monday) %>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Wednesday) %>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Wednesday) %>
<%: Html.ValidationMessageFor(model => model.Wednesday) %>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Friday) %>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Friday) %>
<%: Html.ValidationMessageFor(model => model.Friday) %>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.category) %>
</div>
<div class="editor-field">
<%: Html.DropDownListFor(model => model.category,new SelectList(new List<string> {"Nothing","Traditional","Chill Out","Healthy Lifestyle","Vegitarian","Salad"})) %>
<%: Html.ValidationMessageFor(model => model.category) %>
</div>
<p>
<input type="submit" value="Create" />
</p>
</fieldset>
<% } %>
<div>
<%: Html.ActionLink("Back to List", "Index") %>
</div>
<script src="/js/all.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
ReadyMade.init();
$('.growl_trigger').live('click', function (e) {e.preventDefault();
$.msgGrowl({type: error, title: "Error!", text: 'The category for this list is already listed for next week Monday! Please change the categories here.'});
});
</script>
<div class="msgGrowl-container bottom-right"></div>
</asp:Content>
javascript位於頁面底部。 如果控制器中發生異常,我想嘗試調用它。 忽略實際的錯誤信息。 這甚至“遙遙”可行嗎? 還是有更簡單的方法?
您可以考慮在catch語句中返回return JavaScript(script)
,但是不建議這樣做。
您確實應該讓您的客戶進行客戶端業務。
我發現了針對我的問題的個人解決方法,它可以工作。 當滿足用戶輸入的特定條件時,可以調用Javascript。
在您使用的控制器中,聲明一個ViewData [“ name here”]變量,並在其上執行條件
public ActionResult Create()
{
ViewData["error"] = false;
ViewData["Heading"] = "Create a new menu Item";
return View();
}
[HttpPost]
public ActionResult Create(FormCollection collection,Models.Menu sentData)
{
try
{
// TODO: Add insert logic here
//db.Menus.AddObject(sentData);
ViewData["Heading"] = "Create a new menu Item";
DateTime MondaysDate = Helper.GetNextMonday();
bool existingQuery = ((from m in db.Menus where m.Weekstart == MondaysDate.Date && m.category == sentData.category select m).Count() > 1) ? true : false;
if (existingQuery)
{
ViewData["error"] = true;
return View();
}
else
{
Models.Menu MenuItem = new Models.Menu
{
Monday = sentData.Monday,
Wednesday = sentData.Wednesday,
Friday = sentData.Friday,
category = sentData.category,
Weekstart = Helper.GetNextMonday(),
};
db.Menus.AddObject(MenuItem);
db.SaveChanges();
}
return RedirectToAction("Index");
}
catch
{
//ViewData["error"] can also be set here
return View();
}
}
並在視圖中:
<script src="/js/all.js" type="text/javascript"></script>
<% if ((bool)ViewData["error"] == true)
{ %>
<script type="text/javascript"> $(function () {
ReadyMade.init();
$.msgGrowl({ type: 'error', title: 'Failed to insert record', text: 'Regretfully, your record can not be entered into the database, as menu items of this category is already booked for next Monday. Kindly change the category to something else.'
});
});</script>
<%} %>
IMO,對於滿足特定條件的情況,這是一個非常有效的解決方法,此刻可以運行一段javascript / jquery。
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