Blazor:如何对用户隐藏对象属性,但在代码中访问它?
我想访问下面@code{}中的item.Id,同时将其隐藏在视图中。我不明白怎么做。请派人来帮忙 我希望尽可能避免使用JS,这就是我首先使用Blazor的原因 我不擅长HTML,所以也许有比使用datalist更好的方法 谢谢大家!Blazor:如何对用户隐藏对象属性,但在代码中访问它?,blazor,blazor-webassembly,Blazor,Blazor Webassembly,我想访问下面@code{}中的item.Id,同时将其隐藏在视图中。我不明白怎么做。请派人来帮忙 我希望尽可能避免使用JS,这就是我首先使用Blazor的原因 我不擅长HTML,所以也许有比使用datalist更好的方法 谢谢大家! { <input list="listings" id="listing" name="listing" autocomplete="on" placeholder=&qu
{
<input list="listings" id="listing" name="listing" autocomplete="on" placeholder="Search address..." @oninput="HandleInput" @onchange="HandleDatalistOnChange" />
<datalist id="listings">
@foreach (var item in listings)
{
<option id="@item.Id" value="@item.StreetAddress">@item.Municipality, @item.County</option>
}
</datalist>
<button @onclick="GetProperty">Get</button>
}
@code {
private ViewData[] listings;
private string selectedViewData;
protected override async Task OnInitializedAsync()
{
listings = await Http.GetFromJsonAsync<ViewData[]>("https://localhost:44315/api/listings");
}
private void GetProperty()
{
//@TODO get property from db using id
Console.WriteLine(selectedViewData);
}
private async void HandleInput(ChangeEventArgs e)
{
var input = e.Value.ToString();
if (input.Length > 0)
{
listings = await Http.GetFromJsonAsync<ViewData[]>("https://localhost:44315/api/listings/" + input);
StateHasChanged();
await Task.Delay(1);
}
}
private void HandleDatalistOnChange(ChangeEventArgs e)
{
selectedViewData = e.Value.ToString();
Console.WriteLine(selectedViewData);
}
public class ViewData
{
public int Id { get; set; }
public string StreetAddress { get; set; }
public string Municipality { get; set; }
public string County { get; set; }
}
}
你做不到,看到这个答案了吗 另一种方法是使用开源组件库MatBlazor
您似乎正在使用输入HTML元素,该元素默认为键入文本,并带有自动完成列表。最好改用selecthtml元素。这样可以隐藏ID列并显示文本字段。示例选择: - @如果是列表!=无效的 { @清单中的foreach var项 { @如果listings.Id==item.Id { @item.AddressName } 其他的 { @item.AddressName } } }
使用文本输入的问题是用户可以输入任何内容,而不必存在于数据库中。因此,无法获取ID。这就是我最终使用的
@page "/"
@inject HttpClient Http
<h1>Properties for sale</h1>
@if (listings == null)
{
<p><em>Loading...</em></p>
}
else
{
<input list="listings" id="listing" name="listing" placeholder="Search address..." @oninput="HandleInput" @bind="selectedViewData" />
<datalist id="listings">
@foreach (var item in listings)
{
<option value="@item.location.address.streetAddress, @item.location.region.municipalityName, @item.location.region.countyName"/>
}
</datalist>
<button @onclick="GetProperty">Get</button>
}
@code {
[Parameter]
public List<Listing> listings { get; set; }
private string selectedViewData;
protected override async Task OnInitializedAsync()
{
listings = await Http.GetFromJsonAsync<List<Listing>>("https://localhost:44315/api/listings");
}
private void GetProperty()
{
var listing = listings.Where(l => new String($"{l.location.address.streetAddress}, {l.location.region.municipalityName}, {l.location.region.countyName}").Equals(selectedViewData)).FirstOrDefault();
Console.WriteLine(listing?.Id);
}
private async void HandleInput(ChangeEventArgs e)
{
var input = e.Value.ToString();
if (listings.Any(l => new String($"{l.location.address.streetAddress}, {l.location.region.municipalityName}, {l.location.region.countyName}").Equals(input)))
{
return;
}
if (input.Length > 0)
{
listings = await Http.GetFromJsonAsync<List<Listing>>("https://localhost:44315/api/listings/" + input);
StateHasChanged();
await Task.Delay(1);
}
}
}
您的意思是没有在Html中显示id=@item.id吗?不要用它。您仍然可以在代码中使用ViewData.Id。我的意思是,我不希望该Id显示在选项中,以便用户看到它。他们不需要它。但我需要获取所选选项:s item.Id才能从数据库中获取整个对象。除非在浏览器中使用开发人员工具,否则用户不会看到Id属性。这就是您所关心的吗?我理解如何将item.id id获取到@code{}的唯一方法是将其显示在value中,并使用onchange从option元素获取value属性(如果有意义的话)。但是我不想把它放在value属性中,因为它会显示给用户,用户不需要知道数据库id来选择属性。但是您有value=@item.StreetAddress,而没有value=@item.id,那么如何访问item.id呢
@page "/"
@inject HttpClient Http
<h1>Properties for sale</h1>
@if (listings == null)
{
<p><em>Loading...</em></p>
}
else
{
<input list="listings" id="listing" name="listing" placeholder="Search address..." @oninput="HandleInput" @bind="selectedViewData" />
<datalist id="listings">
@foreach (var item in listings)
{
<option value="@item.location.address.streetAddress, @item.location.region.municipalityName, @item.location.region.countyName"/>
}
</datalist>
<button @onclick="GetProperty">Get</button>
}
@code {
[Parameter]
public List<Listing> listings { get; set; }
private string selectedViewData;
protected override async Task OnInitializedAsync()
{
listings = await Http.GetFromJsonAsync<List<Listing>>("https://localhost:44315/api/listings");
}
private void GetProperty()
{
var listing = listings.Where(l => new String($"{l.location.address.streetAddress}, {l.location.region.municipalityName}, {l.location.region.countyName}").Equals(selectedViewData)).FirstOrDefault();
Console.WriteLine(listing?.Id);
}
private async void HandleInput(ChangeEventArgs e)
{
var input = e.Value.ToString();
if (listings.Any(l => new String($"{l.location.address.streetAddress}, {l.location.region.municipalityName}, {l.location.region.countyName}").Equals(input)))
{
return;
}
if (input.Length > 0)
{
listings = await Http.GetFromJsonAsync<List<Listing>>("https://localhost:44315/api/listings/" + input);
StateHasChanged();
await Task.Delay(1);
}
}
}