Blazor Date Input
The Blazor Bootstrap DateInput component is constructed using an HTML input of type="date" which limits user input based on pre-defined parameters.
This component enables users to input a date using a text box with validation or a special date picker interface.
Basic usage#
The input UI generally varies from browser to browser.
In unsupported browsers, the control degrades gracefully to type="text".
Example View Source
<div class="mb-3">
<DateInput TValue="DateOnly" @bind-Value="@date1" Placeholder="Enter Date" />
</div>
<div class="mb-3">Entered date: @date1</div>
@code {
private DateOnly date1 = DateOnly.FromDateTime(DateTime.Now.AddDays(1));
}Generic type#
The Blazor Bootstrap DateInput component supports several data types: DateOnly, DateOnly?, DateTime, and DateTime?.
This allows flexible component usage to accommodate various data types in Blazor applications.
In the below example, TValue is set to DateOnly, DateOnly?, DateTime, and DateTime?.
Example View Source
DateOnly :
Entered date: 7/25/2024
DateOnly? :
Entered date:
DateTime :
Entered date: 7/25/2024 7:21:29 PM
DateTime? :
Entered date:
<div class="mb-3">
<strong>DateOnly</strong>:
</div>
<div class="mb-3">
<DateInput TValue="DateOnly" @bind-Value="@date1" Placeholder="Enter Date" />
</div>
<div class="mb-3">Entered date: @date1</div>
<div class="mb-3">
<strong>DateOnly?</strong>:
</div>
<div class="mb-3">
<DateInput TValue="DateOnly?" @bind-Value="@date2" Placeholder="Enter Date" />
</div>
<div class="mb-3">Entered date: @date2</div>
<div class="mb-3">
<strong>DateTime</strong>:
</div>
<div class="mb-3">
<DateInput TValue="DateTime" @bind-Value="@date3" Placeholder="Enter Date" />
</div>
<div class="mb-3">Entered date: @date3</div>
<div class="mb-3">
<strong>DateTime?</strong>:
</div>
<div class="mb-3">
<DateInput TValue="DateTime?" @bind-Value="@date4" Placeholder="Enter Date" />
</div>
<div class="mb-3">Entered date: @date4</div>
@code {
private DateOnly date1 = DateOnly.FromDateTime(DateTime.Now.AddMonths(3));
private DateOnly? date2;
private DateTime date3 = DateTime.Now.AddMonths(3);
private DateTime? date4;
}Enable max min#
Set EnableMinMax="true" and set the Max and Min parameters to restrict the user input between the Min and Max range.
If the user tries to enter a number in the DateInput field which is out of range, then it will override with Max or Min value based on the context.
If the user input exceeds the Max value, it will override with the Max value. If the user input is less than the Min value, then it will override with the Min value.
Example View Source
DateOnly :
Min date: 3/25/2024
Max date: 4/25/2025
Entered date: 7/25/2024
DateOnly? :
Min date: 3/25/2024
Max date: 4/25/2025
Entered date:
DateTime :
Min date: 3/25/2024 7:21:29 PM
Max date: 4/25/2025 7:21:29 PM
Entered date: 7/25/2024 7:21:29 PM
DateTime? :
Min date: 3/25/2024 7:21:29 PM
Max date: 4/25/2025 7:21:29 PM
Entered date:
<div class="mb-3">
<strong>DateOnly</strong>:
</div>
<div class="mb-3">
<DateInput TValue="DateOnly" @bind-Value="@date1" EnableMinMax="true" Min="@min1" Max="@max1" Placeholder="Enter Date" />
</div>
<div class="mb-3">Min date: @min1</div>
<div class="mb-3">Max date: @max1</div>
<div class="mb-3">Entered date: @date1</div>
<div class="mb-3">
<strong>DateOnly?</strong>:
</div>
<div class="mb-3">
<DateInput TValue="DateOnly?" @bind-Value="@date2" EnableMinMax="true" Min="@min2" Max="@max2" Placeholder="Enter Date" />
</div>
<div class="mb-3">Min date: @min2</div>
<div class="mb-3">Max date: @max2</div>
<div class="mb-3">Entered date: @date2</div>
<div class="mb-3">
<strong>DateTime</strong>:
</div>
<div class="mb-3">
<DateInput TValue="DateTime" @bind-Value="@date3" EnableMinMax="true" Min="@min3" Max="@max3" Placeholder="Enter Date" />
</div>
<div class="mb-3">Min date: @min3</div>
<div class="mb-3">Max date: @max3</div>
<div class="mb-3">Entered date: @date3</div>
<div class="mb-3">
<strong>DateTime?</strong>:
</div>
<div class="mb-3">
<DateInput TValue="DateTime?" @bind-Value="@date4" EnableMinMax="true" Min="@min4" Max="@max4" Placeholder="Enter Date" />
</div>
<div class="mb-3">Min date: @min4</div>
<div class="mb-3">Max date: @max4</div>
<div class="mb-3">Entered date: @date4</div>
@code {
private DateTime date = DateTime.Now.AddMonths(3);
private DateTime min = DateTime.Now.AddMonths(-1);
private DateTime max = DateTime.Now.AddYears(1);
private DateOnly date1, min1, max1;
private DateOnly? date2, min2, max2;
private DateTime date3, min3, max3;
private DateTime? date4, min4, max4;
protected override void OnInitialized()
{
date1 = DateOnly.FromDateTime(date);
min1 = DateOnly.FromDateTime(min);
max1 = DateOnly.FromDateTime(max);
date2 = null;
min2 = DateOnly.FromDateTime(min);
max2 = DateOnly.FromDateTime(max);
date3 = DateTime.Now.AddMonths(3);
min3 = min;
max3 = max;
date4 = null;
min4 = min;
max4 = max;
}
}Disable#
Use the Disabled parameter to disable the DateInput.
<div class="mb-3">
<DateInput TValue="DateOnly"
@bind-Value="@date1"
Disabled="@disabled"
Placeholder="Enter Date" />
</div>
<div class="mb-3">Entered date: @date1</div>
<Button Color="ButtonColor.Primary" @onclick="Enable"> Enable </Button>
<Button Color="ButtonColor.Secondary" @onclick="Disable"> Disable </Button>
<Button Color="ButtonColor.Warning" @onclick="Toggle"> Toggle </Button>
@code {
private DateOnly date1 = DateOnly.FromDateTime(DateTime.Now);
private bool disabled = true;
private void Enable() => disabled = false;
private void Disable() => disabled = true;
private void Toggle() => disabled = !disabled;
}
Also, use Enable() and Disable() methods to enable and disable the DateInput.
Do not use both the Disabled parameter and Enable() & Disable() methods.
<div class="mb-3">
<DateInput @ref="dateInput"
TValue="DateOnly"
@bind-Value="@date1"
Placeholder="Enter Date" />
</div>
<div class="mb-3">Entered date: @date1</div>
<Button Color="ButtonColor.Secondary" @onclick="Disable"> Disable </Button>
<Button Color="ButtonColor.Primary" @onclick="Enable"> Enable </Button>
@code {
private DateInput<DateOnly> dateInput = default!;
private DateOnly date1 = DateOnly.FromDateTime(DateTime.Now);
private void Disable() => dateInput.Disable();
private void Enable() => dateInput.Enable();
}
Validations#
Like any other blazor input component, DateInput component supports validations. Use the DataAnnotations to validate the user input before submitting the form. In the below example, we used the Required attributes.
Example View Source
@using System.ComponentModel.DataAnnotations
<style>
.valid.modified:not([type=checkbox]) {
outline: 1px solid #26b050;
}
.invalid {
outline: 1px solid red;
}
.validation-message {
color: red;
}
</style>
<EditForm EditContext="@editContext" OnValidSubmit="HandleOnValidSubmit" novalidate>
<DataAnnotationsValidator />
<div class="form-group row mb-3">
<label class="col-md-2 col-form-label">Invoice Date: <span class="text-danger">*</span></label>
<div class="col-md-10">
<DateInput TValue="DateOnly?" @bind-Value="invoice.InvoiceDate" />
<ValidationMessage For="@(() => invoice.InvoiceDate)" />
</div>
</div>
<div class="form-group row mb-3">
<label class="col-md-2 col-form-label">Customer Name: <span class="text-danger">*</span></label>
<div class="col-md-10">
<InputText class="form-control" @bind-Value="invoice.CustomerName" Placeholder="Enter Customer Name" />
<ValidationMessage For="@(() => invoice.CustomerName)" />
</div>
</div>
<div class="row">
<div class="col-md-12 text-right">
<Button Type="ButtonType.Button" Color="ButtonColor.Secondary" Class="float-end" @onclick="ResetForm">Reset</Button>
<Button Type="ButtonType.Submit" Color="ButtonColor.Success" Class="float-end me-2">Submit</Button>
</div>
</div>
</EditForm>
@code {
private Invoice invoice = new();
private EditContext? editContext;
protected override void OnInitialized()
{
editContext = new EditContext(invoice);
base.OnInitialized();
}
public void HandleOnValidSubmit()
{
Console.WriteLine($"Invoice Date: {invoice.InvoiceDate}");
Console.WriteLine($"Customer Name: {invoice.CustomerName}");
}
private void ResetForm()
{
invoice = new();
editContext = new EditContext(invoice);
}
public class Invoice
{
[Required(ErrorMessage = "Invoice Date required.")]
public DateOnly? InvoiceDate { get; set; }
[Required(ErrorMessage = "Customer Name required.")]
public string? CustomerName { get; set; }
}
}Events: ValueChanged#
This event fires on every user keystroke/selection that changes the DateInput value.
Example View Source
<div class="mb-3">
<DateInput TValue="DateOnly" Value="date1" ValueExpression="() => date1" ValueChanged="(value) => DateChanged(value)" />
</div>
<div class="mb-3">Changed date: @date1</div>
<Button Color="ButtonColor.Primary" @onclick="ChangeDate"> Change Date </Button>
@code {
private DateOnly date1 = DateOnly.FromDateTime(DateTime.Now);
private void DateChanged(DateOnly dateOnly)
{
date1 = dateOnly;
}
private void ChangeDate() => date1 = DateOnly.FromDateTime(DateTime.Now.AddDays(3));
}Restrict the date field based on the entry in another date field#
One common scenario is that the date fields are restricted based on the entry in another date field.
In the example below, we restrict the course end time based on the selection of course start date.
Example View Source
@using System.ComponentModel.DataAnnotations
<style>
.valid.modified:not([type=checkbox]) {
outline: 1px solid #26b050;
}
.invalid {
outline: 1px solid red;
}
.validation-message {
color: red;
}
</style>
<EditForm EditContext="@editContext" OnValidSubmit="HandleValidSubmit" novalidate>
<DataAnnotationsValidator />
<div class="form-group row mb-3">
<label class="col-md-2 col-form-label">Course Name: <span class="text-danger">*</span></label>
<div class="col-md-10">
<InputText class="form-control" @bind-Value="onlineCourseForm.CourseName" />
<ValidationMessage For="@(() => onlineCourseForm.CourseName)" />
</div>
</div>
<div class="form-group row mb-3">
<label class="col-md-2 col-form-label">Start Date: <span class="text-danger">*</span></label>
<div class="col-md-10">
<DateInput TValue="DateTime?"
Value="onlineCourseForm.StartDate"
ValueExpression="() => onlineCourseForm.StartDate"
ValueChanged="(value) => StartDateChanged(value)" />
<ValidationMessage For="@(() => onlineCourseForm.StartDate)" />
</div>
</div>
<div class="form-group row mb-3">
<label class="col-md-2 col-form-label">End Date: <span class="text-danger">*</span></label>
<div class="col-md-10">
<DateInput @ref="endDateInput" TValue="DateTime?"
@bind-Value="onlineCourseForm.EndDate"
EnableMinMax="true"
Min="courseMinDate"
Max="courseMaxDate"
Disabled="@disableEndDate" />
<ValidationMessage For="@(() => onlineCourseForm.EndDate)" />
</div>
</div>
<div class="row">
<div class="col-md-12 text-right">
<Button Type="ButtonType.Button" Color="ButtonColor.Secondary" Class="float-end" @onclick="ResetForm">Reset</Button>
<Button Type="ButtonType.Submit" Color="ButtonColor.Success" Class="float-end me-2">Submit</Button>
</div>
</div>
</EditForm>
@code {
DateInput<DateTime?> endDateInput = default!;
private bool disableEndDate = true;
private OnlineCourseForm onlineCourseForm = new();
private EditContext? editContext;
private DateTime? courseMinDate;
private DateTime? courseMaxDate;
[Inject] ToastService ToastService { get; set; } = default!;
protected override void OnInitialized()
{
editContext = new EditContext(onlineCourseForm);
base.OnInitialized();
}
private void StartDateChanged(DateTime? startDate)
{
if (startDate is null || !startDate.HasValue)
{
onlineCourseForm.StartDate = null;
onlineCourseForm.EndDate = null;
courseMinDate = null;
courseMaxDate = null;
disableEndDate = true;
return;
}
onlineCourseForm.StartDate = startDate;
onlineCourseForm.EndDate = null;
courseMinDate = startDate.Value;
courseMaxDate = startDate.Value.AddDays(5);
disableEndDate = false;
}
public void HandleValidSubmit()
{
var toastMessage = new ToastMessage
(
type: ToastType.Success,
iconName: IconName.Check2All,
title: "Success!",
helpText: $"{DateTime.Now.ToLocalTime()}",
message: "Online course schedule created."
);
ToastService.Notify(toastMessage);
}
private void ResetForm()
{
onlineCourseForm = new();
editContext = new EditContext(onlineCourseForm);
}
public class OnlineCourseForm
{
[Required(ErrorMessage = "Course Name required.")]
public string? CourseName { get; set; }
[Required(ErrorMessage = "Start Date required.")]
public DateTime? StartDate { get; set; }
[Required(ErrorMessage = "End Date required.")]
public DateTime? EndDate { get; set; }
}
}
Blazor Bootstrap