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PONet mvc4 form2 being submitted with empty model after form1 posts on the same page successfully returning data to the same model
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  1. PONet mvc4 form2 being submitted with empty model after form1 posts on the same page successfully returning data to the same model
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    copied!<p>I'm using one form with two form posts in it. The first form ("frmTemps") successfully retreieves data and displys it on the form. I can assure you that via debugging the data is in the model when coming back to the View to display the data.</p> <p>Once the data comes back, another button is displayed on the same View, but a second form ("frmProcess") to to some processing on the seclectd data coming back from the first form ("frmTemps"). I know you can have multiple forms on the sme View. It's all part of the control that MVC gives you.</p> <p>The problem is that as soon as I post my second form ("<strong>frmProcess</strong>") <strong>and have a breakpoint set immediately in that action result</strong> and I check the contents of the model, I find out that <strong>all the items in the model are either null, zero, or false.</strong> Via debugging on the model object.</p> <pre><code>[HttpPost] public ActionResult GeneratePDF(ViewModelTemplate_Guarantors model) { </code></pre> <p>I'm using the same model in form2 as I am in form 1.</p> <p>I thought is was understood that after filling out data on a form and after submitting it and having your model type receive it in the action method, this is the standard way to do things.</p> <p>Below, is my ViewModel.</p> <pre><code>public partial class ViewModelTemplate_Guarantors { public int SelectedTemplateId { get; set; } public IEnumerable&lt;PDFTemplate&gt; Templates { get; set; } public int SelectedGuarantorId { get; set; } public IEnumerable&lt;tGuarantor&gt; Guarantors { get; set; } public string LoanId { get; set; } public string SelectedDeptText { get; set; } public string SelectedDeptValue { get; set; } public string LoanType { get; set; } public bool ShowTemps { get; set; } public string Error { get; set; } public string ErrorT { get; set; } public string ErrorG { get; set; } public bool ShowGeneratePDFBtn { get; set; } } </code></pre> <p>Below is my View:</p> <pre><code>@model PDFConverterModel.ViewModels.ViewModelTemplate_Guarantors @{ ViewBag.Title = "BHG :: PDF Generator"; } &lt;h2&gt;@ViewBag.Message&lt;/h2&gt; &lt;div&gt; &lt;table style="width: 1000px"&gt; &lt;tr&gt; &lt;td colspan="5"&gt; &lt;img alt="BHG Logo" src="~/Images/logo.gif" /&gt; &lt;/td&gt; &lt;/tr&gt; @using (Html.BeginForm("Refresh", "Home", FormMethod.Post, new { id = "frmTemps" })) { &lt;tr&gt; &lt;td&gt; @*@(Html.Kendo().NumericTextBox&lt;int&gt;() .Name("txtLoanID") .Placeholder("Enter numeric value") )*@ @Html.LabelFor(model =&gt; model.LoanId) @Html.TextBoxFor(model =&gt; model.LoanId) @Html.ValidationMessageFor(model =&gt; model.LoanId) &lt;td colspan="3"&gt; &lt;input type="submit" id="btnRefresh" value='Refresh' /&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;@Html.LabelFor(model =&gt; model.LoanType) @Html.TextBox("SBA", "SBA") @Html.ValidationMessageFor(model =&gt; model.LoanType) @*@Html.TextBoxFor(model =&gt; model.LoanType)*@ &lt;/td&gt; &lt;td&gt; &lt;label for="ddlDept"&gt;Department:&lt;/label&gt; @(Html.Kendo().DropDownListFor(model =&gt; model.SelectedDeptText) .Name("ddlDept") .DataTextField("DepartmentName") .DataValueField("DepartmentID") .Events(e =&gt; e.Change("Refresh")) .DataSource(source =&gt; { source.Read(read =&gt; { read.Action("GetDepartments", "Home"); }); }) ) @Html.ValidationMessageFor(model =&gt; model.SelectedDeptText) &lt;/td&gt; &lt;/tr&gt; } @using (Html.BeginForm("GeneratePDF", "Home", FormMethod.Post, new { id = "frmProcess" })) { if (Model.ShowGeneratePDFBtn == true) { if (Model.ErrorT != string.Empty) { &lt;tr&gt; &lt;td colspan="5"&gt; &lt;u&gt;&lt;b&gt;@Html.Label("Templates:")&lt;/b&gt;&lt;/u&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; @foreach (var item in Model.Templates) { &lt;td&gt; @Html.CheckBoxFor(model =&gt; item.IsChecked) @Html.DisplayFor(model =&gt; item.TemplateName) &lt;/td&gt; } &lt;/tr&gt; } else { Model.Error = Model.ErrorT; } if (Model.ErrorG != string.Empty) { &lt;tr&gt; &lt;td colspan="5"&gt; &lt;u&gt;&lt;b&gt;@Html.Label("Guarantors:")&lt;/b&gt;&lt;/u&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; @foreach (var item in Model.Guarantors) { &lt;td&gt; @Html.CheckBoxFor(model =&gt; item.isChecked) @Html.DisplayFor(model =&gt; item.GuarantorFirstName)&amp;nbsp;@Html.DisplayFor(model =&gt; item.GuarantorLastName) &lt;/td&gt; } &lt;/tr&gt; } else { Model.Error = Model.ErrorG; } &lt;tr&gt; &lt;td&gt; &lt;input type="submit" id="btnGeneratePDF" value='Generate PDF' /&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td colspan="5"&gt; @Model.Error &lt;/td&gt; &lt;/tr&gt; } } &lt;/table&gt; &lt;/div&gt; &lt;script type="text/javascript"&gt; $('btnRefresh').on('click', '#btnRefresh', function () { Refresh(); }); function Refresh() { var LoanID = $("#LoanID").val(); if (LoanID != "") { document.forms["frmTemps"].submit(); } } &lt;/script&gt; </code></pre> <p>Below, is my pertinent part of the Controller:</p> <pre><code>[HttpPost] public ActionResult GeneratePDF(ViewModelTemplate_Guarantors **model**) { try { int FolderNo, GuarantorNum = 0; string Folder, LoanFolder = String.Empty; string FormId, FormName, GuarantorName = String.Empty; int LoanId = Convert.ToInt32(model.LoanId); LoanFolder = LoanId.ToString().PadLeft(8, '0'); //To calculate FolderId based on LoanId if ((LoanId &gt; 0) &amp;&amp; (LoanId &lt; 99000)) { FolderNo = ((int)(LoanId / 10000) * 10000); } else { FolderNo = ((int)(LoanId / 1000) * 1000); } Folder = ((int)FolderNo).ToString(); Folder = Folder.PadLeft(8, '0'); </code></pre> <p>I submitted form <code>A</code> through button 1. The model came back and populated my <code>View A</code>. Now I want to submit <code>View A</code> again with button 2 to a different Action method in the same controller.</p> <p>When I submit the form again to the same Controller with my Model as the receiving parameter, my model is empty when it gets to the action method. I know my model has data in it when it came back above in the first step.</p> <p>Being relatively new to MVC, I am under the impression that if your View is populated with data and you submit your form to a Controller, you Model should have data in it. I realize now, that the Model is not persistent. Once you pass the Model to the View and vice-versa, it's gone. I get it.</p> <p>All I want to find out is how can I populate my model with data before I submit it to the Controller so it sends data to the Controller with my Model populated to render a View? It's that simple. Not ehtat my model is a strongly typed Model. I feel that this is a major cornerstone to understanding how I can submit data back &amp; forthe between Views &amp; Controllers and is very important to the understanding of how MVC works.</p> <p>What am I doing wrong where my data is empty when it gets to my Controller again. How do I get the data from the View back inside the Model before I submit where my Model will have data in it in order to do some processing and render the View again.</p> <p>If there is data that already resides on the form from the previous postback, then when I post again via the second button, why doesn't MVC use the model binder to create my model with the form data and post it.</p> <p>I know the loanid and ddl won't be in the data (because it's not wrapped around the second form), but I am very perplexed in the way it works. I was expecting it to post the data back that resides on the form into the model. Why doesn't it do this?</p>
 

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