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MultiselectList with selected values are not pre selected in View

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0

I have a simple service which is :
1. Getting All roles in a system
2. Check the role of current selected user
3. Render all roles in a dropdown , selecting current user roles by default

To do that , I have following code:

 public ActionResult Edit(string userId)
 

 var user = _oAuthUserService.GetUsers()?.Where(u => u.UserId == userId).FirstOrDefault();

 var userRoles = user.Roles; //[Admin,Manager]

 var allRolesFromService = _oAuthUserService.AllRoles.Select(x=>new 
 Id =x.RoleName,
 Name =x.RoleName
 ).ToList(); //All roles in the System [Role1,Role2,Role3,Admin,Manager]


 ViewData["AllRoles"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);


 return View(user);


 

In view I am doing ,

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" );

But when I navigate to view , none of the items are pre-selected? What am I missing here?

c# asp.net asp.net-mvc asp.net-mvc-4 razor

share|improve this question

edited Mar 23 at 6:01

ArunPratap

1,99631128

asked Mar 19 at 7:01

SimsonsSimsons

5,22730107210

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Try replacing your ViewData key name, because AllRoles already used to bound with ListBox, avoiding potential naming collision. Alternatively use ListBoxFor with strongly-typed viewmodel property.
  
  – Tetsuya Yamamoto
  Mar 19 at 7:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And changing viewDataKey Works!! Never though it could be the issue, Can you answer the question and I will accept as the solution.
  
  – Simsons
  Mar 19 at 7:12
  

  
  
  
  

add a comment | 

0

I have a simple service which is :
1. Getting All roles in a system
2. Check the role of current selected user
3. Render all roles in a dropdown , selecting current user roles by default

To do that , I have following code:

 public ActionResult Edit(string userId)
 

 var user = _oAuthUserService.GetUsers()?.Where(u => u.UserId == userId).FirstOrDefault();

 var userRoles = user.Roles; //[Admin,Manager]

 var allRolesFromService = _oAuthUserService.AllRoles.Select(x=>new 
 Id =x.RoleName,
 Name =x.RoleName
 ).ToList(); //All roles in the System [Role1,Role2,Role3,Admin,Manager]


 ViewData["AllRoles"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);


 return View(user);


 

In view I am doing ,

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" );

But when I navigate to view , none of the items are pre-selected? What am I missing here?

c# asp.net asp.net-mvc asp.net-mvc-4 razor

share|improve this question

edited Mar 23 at 6:01

ArunPratap

1,99631128

asked Mar 19 at 7:01

SimsonsSimsons

5,22730107210

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Try replacing your ViewData key name, because AllRoles already used to bound with ListBox, avoiding potential naming collision. Alternatively use ListBoxFor with strongly-typed viewmodel property.
  
  – Tetsuya Yamamoto
  Mar 19 at 7:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  And changing viewDataKey Works!! Never though it could be the issue, Can you answer the question and I will accept as the solution.
  
  – Simsons
  Mar 19 at 7:12
  

  
  
  
  

add a comment | 

I have a simple service which is :
1. Getting All roles in a system
2. Check the role of current selected user
3. Render all roles in a dropdown , selecting current user roles by default

To do that , I have following code:

 public ActionResult Edit(string userId)
 

 var user = _oAuthUserService.GetUsers()?.Where(u => u.UserId == userId).FirstOrDefault();

 var userRoles = user.Roles; //[Admin,Manager]

 var allRolesFromService = _oAuthUserService.AllRoles.Select(x=>new 
 Id =x.RoleName,
 Name =x.RoleName
 ).ToList(); //All roles in the System [Role1,Role2,Role3,Admin,Manager]


 ViewData["AllRoles"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);


 return View(user);


 

In view I am doing ,

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" );

But when I navigate to view , none of the items are pre-selected? What am I missing here?

c# asp.net asp.net-mvc asp.net-mvc-4 razor

share|improve this question

edited Mar 23 at 6:01

ArunPratap

1,99631128

asked Mar 19 at 7:01

SimsonsSimsons

5,22730107210

 public ActionResult Edit(string userId)
 

 var user = _oAuthUserService.GetUsers()?.Where(u => u.UserId == userId).FirstOrDefault();

 var userRoles = user.Roles; //[Admin,Manager]

 var allRolesFromService = _oAuthUserService.AllRoles.Select(x=>new 
 Id =x.RoleName,
 Name =x.RoleName
 ).ToList(); //All roles in the System [Role1,Role2,Role3,Admin,Manager]


 ViewData["AllRoles"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);


 return View(user);


 

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" );

share|improve this question

edited Mar 23 at 6:01

ArunPratap

1,99631128

asked Mar 19 at 7:01

SimsonsSimsons

5,22730107210

share|improve this question

edited Mar 23 at 6:01

ArunPratap

1,99631128

asked Mar 19 at 7:01

SimsonsSimsons

5,22730107210

edited Mar 23 at 6:01

ArunPratap

1,99631128

edited Mar 23 at 6:01

ArunPratap

1,99631128

asked Mar 19 at 7:01

SimsonsSimsons

5,22730107210

asked Mar 19 at 7:01

SimsonsSimsons

5,22730107210

1 Answer
1

active

oldest

votes

1

The problem occurs because you're using same ViewData key name as model name bound to ListBox helper in this line:

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" )

Assumed that AllRoles is an array or list property inside viewmodel class, you can't reuse it as ViewData key name because naming collision will happen between them, causing the option lists won't show up properly. You can rename ViewData key name with any different name than viewmodel's property name:

ViewData["AllRolesList"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);

And then use new key name within ListBox(For) helper:

ListBox helper

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

ListBoxFor helper

@Html.ListBoxFor(model => model.AllRoles, (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

share|improve this answer

answered Mar 19 at 7:18

Tetsuya YamamotoTetsuya Yamamoto

17.2k42342

add a comment | 

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1

The problem occurs because you're using same ViewData key name as model name bound to ListBox helper in this line:

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" )

Assumed that AllRoles is an array or list property inside viewmodel class, you can't reuse it as ViewData key name because naming collision will happen between them, causing the option lists won't show up properly. You can rename ViewData key name with any different name than viewmodel's property name:

ViewData["AllRolesList"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);

And then use new key name within ListBox(For) helper:

ListBox helper

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

ListBoxFor helper

@Html.ListBoxFor(model => model.AllRoles, (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

share|improve this answer

answered Mar 19 at 7:18

Tetsuya YamamotoTetsuya Yamamoto

17.2k42342

add a comment | 

1

The problem occurs because you're using same ViewData key name as model name bound to ListBox helper in this line:

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" )

Assumed that AllRoles is an array or list property inside viewmodel class, you can't reuse it as ViewData key name because naming collision will happen between them, causing the option lists won't show up properly. You can rename ViewData key name with any different name than viewmodel's property name:

ViewData["AllRolesList"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);

And then use new key name within ListBox(For) helper:

ListBox helper

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

ListBoxFor helper

@Html.ListBoxFor(model => model.AllRoles, (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

share|improve this answer

answered Mar 19 at 7:18

Tetsuya YamamotoTetsuya Yamamoto

17.2k42342

add a comment | 

The problem occurs because you're using same ViewData key name as model name bound to ListBox helper in this line:

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" )

Assumed that AllRoles is an array or list property inside viewmodel class, you can't reuse it as ViewData key name because naming collision will happen between them, causing the option lists won't show up properly. You can rename ViewData key name with any different name than viewmodel's property name:

ViewData["AllRolesList"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);

And then use new key name within ListBox(For) helper:

ListBox helper

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

ListBoxFor helper

@Html.ListBoxFor(model => model.AllRoles, (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

share|improve this answer

answered Mar 19 at 7:18

Tetsuya YamamotoTetsuya Yamamoto

17.2k42342

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRoles"], new multiple = "multiple" )

ViewData["AllRolesList"] = new MultiSelectList(allRolesFromService, "Id", "Name", userRoles);

@Html.ListBox("AllRoles", (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

@Html.ListBoxFor(model => model.AllRoles, (MultiSelectList)ViewData["AllRolesList"], new multiple = "multiple" )

share|improve this answer

answered Mar 19 at 7:18

Tetsuya YamamotoTetsuya Yamamoto

17.2k42342

answered Mar 19 at 7:18

Tetsuya YamamotoTetsuya Yamamoto

17.2k42342

answered Mar 19 at 7:18

Tetsuya YamamotoTetsuya Yamamoto

17.2k42342