In my application I need to pass some values from one page(page A to Page B) to another page.
For this I am using Session variables(I cannot use Tempdata as it doesn't work on loadbalancing).
In Page A I am setting the Session Variable.
In Page B I need to retrieve the above Session variable.
For this I am using a Hidden field in Page B.
I dont know how to set the Session Variable to Hidden Field in Page B.
Page A
[HttpPost]
public JsonResult GetFileName(string updatedfileName, string orgfileName)
{
Session["OrgFileName"] = orgfileName;
Session["UpdatedFileName"] = updatedfileName;
var result = myService.getFile(updatedfileName, orgfileName);
return Json(result, JsonRequestBehavior.AllowGet);
}
Page B
<div style="display:none" >
<input type="hidden" value="" id="hdnfilename" />
</div>
In the controller of "Page B", set a ViewBag.MyValueto your session variable and apply it to the hidden's value.
Controller
ViewBag.MyValue = Session["MYVALUE"];
View
<input type="hidden" value="#ViewBag.MyValue" id="hdnfilename" />
If you need to get a session variable from JavaScript, you will need to develop an action that will return the session variable and consume it with JavaScript/jQuery, like this:
// Controller code
[HttpGet]
public JsonResult GetSessionVarValue(string key)
{
return Json(new { key = key, value = Session[key] }, JsonRequestBehavior.AllowGet);
}
// JavaScript code
var mySessionValue;
$.getJSON("/GetSessionVarValue", "MYKEY", function(data) {
mySessionValue = data.value;
});
You may take care with Session variables in load balance, too. The best way to secure store session variables is changing the state of session mode configuration to StateServer. http://msdn.microsoft.com/en-us/library/ms178586.aspx
Related
I have page that has checkbox that is used to expand/collapse some part of the page. This is client-side logic done in JavaScript.
I want to preserve the state of this checkbox for this particular page. Can Razor Pages do this automatically?
I tried by adding bool property with [BindProperty(SupportsGet = true)] in PageModel but it doesn't work - when I check the checkbox and reload (HTTP GET) the checkbox is always false.
Guessing that this toggle feature is user-specific, and that you want to persist their choice over a number of HTTP requests, I recommend setting a cookie using client-side code, which is user- or more accurately device-specific and can persist for as long as you need, and can be read on the server too.
https://developer.mozilla.org/en-US/docs/Web/API/Document/cookie
https://www.learnrazorpages.com/razor-pages/cookies
I want to preserve the state of this checkbox for this particular page. Can Razor Pages do this automatically?
No, since you don't send it to the backend it will not show it.
As Mike said, it better we could store it inside the client cookie or storage.
More details, you could refer to below codes:
<p>
<input type="checkbox" id="cbox1" checked="checked">
<label >This is the first checkbox</label>
</p>
#section scripts{
<script>
$(function(){
var status = getValue();
if(status === "true"){
$("#cbox1").attr("checked","checked");
}else{
$("#cbox1").removeAttr("checked");
}
})
$("#cbox1").click(function(){
var re = $("#cbox1").is(":checked")
alert(re);
createItem(re);
});
function createItem(value) {
localStorage.setItem('status', value);
}
function getValue() {
return localStorage.getItem('status');
} // Gets the value of 'nameOfItem' and returns it
console.log(getValue()); //'value';
</script>
}
I have a form which is used to create a resource, and it has two fields to be populated. When a user enters a value into the first field, I want to automatically call back to an action method on the server which will determine the value to use in the second field, without the user having to submit the form.
For example:
Full Name - User enters this value
Username - View calls server with the value specified in Full Name, server calculates value to be used, server passes value back to view, view presents the value.
Is it possible to do this in MVC core, and if so, can you please point the right direction?
I've been reading up on remote validation, and feel that I could probably use (or abuse) it in order to achieve the functionality looking for, but I'd imagine there's a property way to do this.
Any pointers appreciated.
Remote Validation can only do the validation without submitting the form, but It can't assign value to another field. In your case. It's actually very simple. You can use the js onchange event listen to the first field, in the event, use ajax to access the background. and then fill the returned value into the second field in the callback function. Below is a simple test
View:
<span>Full Name</span>
<input type="text" id="FullName" name="FullName" />
<span>User Name</span>
<input type="text" id="UserName" name="UserName" />
#section scripts{
<script>
$("#FullName").on("change", function () {
$.ajax({
type: "post",
url: "/User/GetUserName",
data: {
fullname: $("#FullName").val()
},
success: function (result) {
$("#UserName").val(result);
}
})
})
</script>
}
Controller:
[HttpPost]
public string GetUserName(string fullname)
{
var username = fullname.Split(" ");
return username.First();
}
Result:
#mj1313's answer was extremely helpful, but I didnt like the idea of having some loose Javascript kicking around in my views, especially since I may need to use this same functionality in multiple views.
I ended up converting the script into a global function, and calling it from within the onchange event like so.
JS Function
(in site.js)
function fullNameToUserName (fullNameId, usernameId) {
$.ajax({
type: "get", // GET rather than POST
url: "/User/GetUserNameFromFullName",
data: {
fullname: $(fullNameId).val()
},
success: function (result) {
$(usernameId).val(result);
}
})
}
Action method
[HttpGet("GetUserNameFromFullName")] // GET rather than POST
public IActionResult GetUserNameFromFullName(string fullName)
{
var username = fullName.Split(" ");
return Ok(username.First());
}
Model
public class UserModel
{
public string FullName { get; set; }
public string Username { get; set; }
}
View
#model MvcApp.Models.UserModel
#Html.DisplayNameFor(m => m.FullName)
#Html.TextBoxFor(m => m.FullName, new
{
onchange = $"fullNameToUserName({#Html.IdFor(m => m.FullName)}, {#Html.IdFor(m => m.Username)});"
})
#Html.DisplayNameFor(m => m.Username)
#Html.TextBoxFor(m => m.Username)
The only problem I have with this approach is that the call to fullNameToUserName(fullNameId, usernameId) is not strongly-typed, and if this function is called from multiple views, it's likely to be miss-typed at some point.
While #mj1313's answer was great and pointed me in the right direction, I wasn't fully satisfied with the approach. Personally, I prefer this approach as it's slightly more reusable and keeps my view's more lean.
I have created a texbox. When user give some input in the textbox and click the actionlink below, the value of the textbox will get pass to the actionResult(FWMenu) in the controller. I can not use html.begin form and submit button in the view. And i can not even use [httppost] in my controller.
Is it possible in that way? If yes then please help me how.
I have not used any class in model.
Below is my Controller.
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
public ActionResult FWMenu(string username)
{
return View();
}
}
This is my View.
<div>
#Html.TextBox("txtUserName")
#Html.ActionLink("Login", "FWMenu", new { username = #Html.TextBox("txtUserName") })
</div>
You need to use javascript/jquery to build the url and redirect. From your comments you mentioned you wanted to use a image rather than a button or link, and that you will have multiple items, so assuming you html is
<div>
<input type="text" name="username">
<img class="submit scr=....>
<div>
<script>
var urlBase='#Url.Action("FWMenu");
$('.submit').click(function() {
var userName = $(this).prev('input').val();
location.href = urlBase + '/' + userName;
}
</script>
Side note: No real point using #Html.TextBox("txtUserName") and if you have multiple instance of this it would generate invalid html (duplicate id attributes) and in any case the name of the parameter is username so it would have needed to be #Html.TextBox("username")`
I'm new to MVC (using 4, framework 4.0) and I understand the basics but this page redirect isn't working as I expect. The application is a login/authentication which if the user successfully logs in it redirects them to the target application. That part works just fine. However the user may forget his/her login credentials, so I have a series of pages that will prompt the user for a registered email address and decoded captcha value. If that information is validated then another page prompts for a series of (up to 3) pre-determined security question answers (in the case of a password forgotten). If the security challenge question is successfully answered the user is redirected to a password change page. At any point in the process the user may click a cancel button which should redirect back to the login page and clear any state variables tracking their progress through the recovery process. The problem is I keep getting stuck on pages that even after a RedirectToAction("SomeAction", "SomeController"); I still stay on the page? The URI even changes on the browser but the page asking for email address or security question stays active. I'm using an ajax $.get() to call various actions for submit and cancel.
view is defined like this:
#using (Html.BeginForm("RecoverUserCredentialsByModel", "Account", FormMethod.Get, new { id = "form1" }))
{
<!--... three input controls and a submit and cancel button-->
<p>
<button id="btnSubmit" onclick="return CheckUserEmail()">Submit</button>
<button id="btnCancel" onclick="return CancelRecovery()">Cancel</button>
</p>
}
<script type="text/javascript">
function CheckUserEmail() {
var emailAddress = document.getElementById("EmailAddress").value;
var pictogramHref = document.getElementById("pictogramHref").src;
var pictogramAnswer = document.getElementById("Pictogram").value;
if (emailAddress != null) {
var url = "/Account/ValidateEmail";
$.get(url, { "emailAddress": emailAddress, "pictogramHref": pictogramHref, "pictogramTranslation": pictogramAnswer }, null);
return true;
}
}
</script>
<script type="text/javascript">
function CancelRecovery() {
var url = "/AuthenticationModule/Account/CancelRecovery";
$.get(url, {}, null);
return true;
}
</script>
Codebehind redirections look like:
/// <summary>
/// Global cancel recovery, clears the stateful session object and redirects back to login view
/// </summary>
/// <returns>ActionResult</returns>
[AllowAnonymous]
public ActionResult CancelRecovery()
{
LoginModel statefulLoginModel = null;
try
{
// Reset everything active and redirect to login view
statefulLoginModel = new LoginModel();
Session["LoginModel"] = statefulLoginModel;
return Redirector(statefulLoginModel);
}
catch (Exception ex)
{
// Log the error and Reset everything active and redirect to login view
FileLogger.Log(ex);
statefulLoginModel = new LoginModel();
Session["LoginModel"] = statefulLoginModel;
return Redirector(statefulLoginModel);
}
}
[AllowAnonymous]
public ActionResult Redirector(LoginModel model)
{
... some code
Session["LoginModel"] = statefulLoginModel;
if (loginState == 0)
{
RedirectToAction("LogOn");
}
}
When it hits the RedirectToAction("LogOn"); the view "RecoverUserInfo" stays active on the browser and no redirection occurs?
What am I doing wrong?
Try this..........
Proper Syntax is return RedirectToAction("ActionName","ControllerName");
In this case if Logon Action is written on the same Controller Then use following Code..
return RedirectToAction("LogOn");
or it is written on another controller then just replace your Action Name and Controller Name in the following code.
return RedirectToAction("ActionName","ControllerName");
In my mvc4 application i want to use html.beginform() to pass multiple parameters to an actionResult on the same controller.
I do it like this:
view:
<div>
#using (Html.BeginForm("AddNote", "Lead",FormMethod.Post, null))
{
#Html.Hidden("leadID",#Model.ID)
<input type="text" name="noteBody" />
<input type="submit" class="mainButton" value="Add New!"/>
}
</div>
Controller (LeadController):
[HttpPost]
ActionResult AddNote(int leadID, string noteBody)
{
Note note = new Note();
note.DateModified = DateTime.Now;
note.Title = "No Title";
note.Body = noteBody;
Lead lead = unitOfWork.LeadRepository.GetById(leadID);
lead.Notes.Add(note);
unitOfWork.Save();
return RedirectToAction("Details", new { id = leadID });
}
when i press the submit button i get an exception:
The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested URL: /Lead/AddNote
this is the place to say that i have tried it withput parameters and it worked just fine.
I've also tried to pass the "leadID" parameter inside the form declaration (new {leadID = #Model.ID}).
Any idea what am i doing wrong ?
Just add the 'public' modifier to your action and it will do the magic.
The AddNote method should be public. Use the public keyword and it will work.
Add the HTTPPOST attribute , like this
[HttpPost]
ActionResult AddNote(int leadID, string noteBody)
{
Note note = new Note();
note.DateModified = DateTime.Now;
note.Title = "No Title";
note.Body = noteBody;
Lead lead = unitOfWork.LeadRepository.GetById(leadID);
lead.Notes.Add(note);
unitOfWork.Save();
return RedirectToAction("Details", new { id = leadID });
}
Perhaps it helps you