HiI have problem to get data using DropDownListAfter I selected date from DropDownList then submit button that DropDownList reset to 0 valueI want to keep data even though I clicked submit button not to reset value which is 0Please check my code and help me how to hold datalth2 id34Choosedurrent34gtChoose Currentlth2gt ltselect id34YearCu34 name34YearCu34 style34width 150pxheight 40px34gt ltoption value34034gtPlease Select Yearltoptiongt ltoption value34202134gt2021ltoptiongt ltoption value34202234gt2022ltoptiongt ltoption value34Other34gtOtherltoptiongt ltselectgt ltbr gt ltselect id34Month34 name34Month34 style34width 150pxheight 40px34 onchange34thisformsubmit34 gt ltoption value34034gtPlease Select Monthltoptiongt ltoption value34134gtJa

sangyong...

Retain DropDownList selected value after submitting Form in ASP.Net Core MVC

CLOSED
User: sangyong...
Posted: on Jun 17, 2022 11:00 PM
Forum: ASP.Net Core MVC
Answer: 0
Views: 713
Sample Code: Download

Hi,

I have problem to get data using DropDownList.

After I selected date from DropDownList, then submit button, that DropDownList reset to 0 value.

I want to keep data even though I clicked submit button not to reset value which is "0".

Please check my code and help me how to hold data?

<h2 id="Choosedurrent">Choose Current</h2>
    <select id="YearCu" name="YearCu" style="width: 150px;height: 40px;">
        <option value="0">Please Select Year</option>
        <option value="2021">2021</option>
        <option value="2022">2022</option>
        <option value="Other">Other</option>
    </select>
    <br />
    <select id="Month" name="Month" style="width: 150px;height: 40px;" onchange="this.form.submit()" >
        <option value="0">Please Select Month</option>
        <option value="1">Jan</option>
        <option value="2">Feb</option>
        <option value="3">March</option>
        <option value="4">April</option>
        <option value="5">May</option>
        <option value="6">June</option>
        <option value="7">July</option>
        <option value="8">Aug</option>
        <option value="9">Sep</option>
        <option value="10">Oct</option>
        <option value="11">Nov</option>
        <option value="12">Dec</option>
    </select>
</td>
<td style="padding:20px;">
    <h2 id="Comparess">Compare </h2>
    <select id="YearCom" name="YearCom" style="width: 150px;height: 40px;">
        <option value="0">Please Select Year</option>
        <option value="2021">2021</option>
        <option value="2022">2022</option>
 
    </select>
    <br />
    <select id="MonthCom" name="MonthCom" style="width: 150px;height: 40px;">
        <option value="0">Please Select Month</option>
        <option value="1">Jan</option>
        <option value="2">Feb</option>
        <option value="3">March</option>
        <option value="4">April</option>
        <option value="5">May</option>
        <option value="6">June</option>
        <option value="7">July</option>
        <option value="8">Aug</option>
        <option value="9">Sep</option>
        <option value="10">Oct</option>
        <option value="11">Nov</option>
        <option value="12">Dec</option>
    </select> 
    <select id="txtOther01" name="Presetss" style="width: 220px; height: 40px; display: none;">
        <option value="0">Please Select Preset</option>
        <option value="ytd">Year-To-Date</option>
 
    </select>
</td>

[HttpGet]
public ActionResult SalesGraph(string YearCu, string Month, string YearCom, string MonthCom, string Presetss)
{
    var Username5 = User.Identity.Name;
    ViewBag.Arrival = Month;
 
    var ok1 = db.Users.Where(x => x.UserName == Username5).FirstOrDefault();
    if (ok1 != null)
    {
        ViewBag.Ok2 = ok1.Po_Name;
        ViewBag.Ok3 = ok1.Hired_date.ToString("MM/dd/yyyy");
        ViewBag.Ok4 = ok1.Department2;
        ViewBag.Ok5 = ok1.User_Point;
        ViewBag.Ok6 = ok1.Name;
        ViewBag.Ok9 = ok1.Pto_Point;
        ViewBag.Ok10 = ok1.Personal_Leave;
        ViewBag.Ity = db.Messages.Where(x => x.Isread == false && x.MessageTo == ok1.Name).Count();
 
        if (ok1.Position_order <= 5)
        {
            ViewBag.Ok7 = "Manager";
        }
        if (ok1.Position_order == 3 && ok1.Department1 == "Retail Experience")
        {
            ViewBag.Ok8 = "Manager";
        }
    return View();
}

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dharmendr

0 1

ANSWER
User: dharmendr
Replied: on Jun 17, 2022 11:20 PM
Report

Hi sangyongjin88,

Do you want to retain all the DropDownList selected value?

dharmendr

0 2

ANSWER
User: dharmendr
Replied: on Jun 18, 2022 07:18 AM
Report

Hi sangyongjin88,

In order to retain the selected value you need to Set the value in TempData and retrieve the TempData in View page to set the DropDownList value using JavaScript.

Refer below example.

Controller

public class HomeController : Controller
{
    public IActionResult Index()
    {
        return View();
    }

    [HttpPost]
    public IActionResult Index(string year, string month)
    {
        TempData["Year"] = year;
        TempData["Month"] = month;
        return View();
    }
}

View

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <form method="post" asp-controller="Home" asp-action="Index">
        <select id="ddlYears" name="Year" style="width: 150px;height: 40px;">
            <option value="0">Please Select Year</option>
            <option value="2021">2021</option>
            <option value="2022">2022</option>
            <option value="Other">Other</option>
        </select>
        <select id="ddlMonths" name="Month" style="width: 150px;height: 40px;" onchange="this.form.submit()">
            <option value="0">Please Select Month</option>
            <option value="1">Jan</option>
            <option value="2">Feb</option>
            <option value="3">March</option>
            <option value="4">April</option>
            <option value="5">May</option>
            <option value="6">June</option>
            <option value="7">July</option>
            <option value="8">Aug</option>
            <option value="9">Sep</option>
            <option value="10">Oct</option>
            <option value="11">Nov</option>
            <option value="12">Dec</option>
        </select>
        <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
        @if (TempData["Year"] != null)
        {
            <script type="text/javascript">
                $(function () {
                    $("#ddlYears").val(@TempData["Year"]);
                });
            </script>
        }

        @if (TempData["Month"] != null)
        {
            <script type="text/javascript">
                $(function () {
                    $("#ddlMonths").val(@TempData["Month"]);
                });
            </script>
        }
    </form>
</body>
</html>

Screenshot

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Retain DropDownList selected value after submitting Form in ASP.Net Core MVC

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