c# - ASP.NET MVC Binding Value in View -


struggling value drop down, passed controller db inserting. starts simple class each item in drop down.

 public class selectlisturgencynum {     public string text { get; set; }     public string value { get; set; } }

then in view model create list of these objects such..

public class createviewmodel {     public change changevm { get; set; }      public list<requesttype> rtypes { get; set; }      public list<selectlisturgencynum> listurgency { get; set; } }

finally controller populate list displayed in dropdown.

public actionresult create()     {          var urgnums = new list<selectlisturgencynum>();         for(int = 1; < 6; i++)         {             urgnums.add(new selectlisturgencynum() { text = i.tostring(), value = i.tostring() });         }          var viewmodel = new createviewmodel         {             listurgency = urgnums          };            return view(viewmodel);     }

i used 1 - 5 make simpler understand.

my view creates ddl this.

  <div class="form-group">         @html.labelfor(model => model.changevm.urgencynum, htmlattributes: new { @class = "control-label col-md-2" })         <div class="col-md-2">             <select class="form-control" id="select">                 <option> 1 = least urgent</option>                 @foreach(var item in model.listurgency)                 {                     <option>@item.text</option>                 }                 </select>              @*how grab value of selected??*@           @html.validationmessagefor(model => model.changevm.urgencynum, "", new { @class = "text-danger" })          </div>

so i'm not sure how value of selected drop down option is, on insert can access it. possibly hiddenfor?

and if use hidden for, how look?

if answered please link..

if want pass text , value, can use selectlistitem class system.web.mvc, there passing items dropdown lists.

public class createviewmodel {     public change changevm { get; set; }      public list<requesttype> types { get; set; }      public list<selectlistitem> listurgency { get; set; } }

in controller create() method create new changevm also

var viewmodel = new createviewmodel() {     changevm = new change(),     listurgency = urgnums };  return view(viewmodel);

on view can use html.dropdownlistfor extension method take care of creating list given items , proper name.

html.beginform take care of creating form proper "action" url, , method.

@using (html.beginform("create", "home", formmethod.post)) { <div class="form-group">     @html.labelfor(model => model.changevm.urgencynum, htmlattributes: new { @class = "control-label col-md-2" })     <div class="col-md-2">         @html.dropdownlistfor(model => model.changevm.urgencynum, model.listurgency, "choose urgency...")         @html.validationmessagefor(model => model.changevm.urgencynum, "", new { @class = "text-danger" })     </div>     <input type="submit" value="submit"/> </div> }

in controller can use 

    [httppost]     public actionresult create(createviewmodel vmodel)     {         if(vmodel?.changevm?.urgencynum != null)         {             var chosenvalue = vmodel.changevm.urgencynum;         }          return view(vmodel);     }

if goes well, should have value chosen in vmodel.changevm.urgencynum


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more