Blazor jquery select2 双向绑定

Question

我在 blazor 服务器端使用了 jquery select2 如何绑定选定值

<InputSelect class="form-control select2" @bind-Value="@purchaseSearch.PriorityId" id="search-priorityId">
<option value="">All</option>
@foreach (var priority in priorities)
{
<option value="@priority.Id">@priority.Name</option>
}
</InputSelect>

Answer 1

我已经为 blazor 创建了一个带有 select2 库的自定义组件选择。 我希望这是给你的例子。 - Select2.razor：

@typeparam TValue
@inherits InputBase<TValue>
@if (!string.IsNullOrWhiteSpace(Label))
{
    <label class="form-control-label" for="@Id">
        @Label
        @if (Required)
        {
            <font color="red">(*)</font>
        }
    </label>
}
else
{
    <LabelFor FieldIdentifier="FieldIdentifier"></LabelFor>
}
<select id="@Id" class="form-control select2" style="width: 100%;" >
    <option @key="null" value="null">--- Chọn ---</option>
    @if (Datasource != null)
        @foreach (var item in Datasource)
        {
            if (item.Key == Value?.ToString())
            {
                <option @key="@item.Key" value="@item.Key" selected="selected">
                    @((MarkupString)@item.Value)
                </option>
            }
            else
            {
                <option @key="@item.Key" value="@item.Key">
                    @((MarkupString)@item.Value)
                </option>
            }
        }
</select>
<div class="form-control-validation">
    <CustomValidationMessage  Field="FieldIdentifier" TValue="string" />
</div>

• Select2.razor.cs

   public partial class SelectWithFilter<TValue>: InputBase<TValue> { [Parameter] public string Id { get; set; } [Parameter] public string Label { get; set; } [Parameter] public bool Required { get; set; } //[Parameter] public Expression<Func<string>> ValidationFor { get; set; } [Parameter] public ICollection<KeyValuePair<string, string>> Datasource { get; set; } [Inject] IJSRuntime JSRuntime { get; set; } public DotNetObjectReference<SelectWithFilter<TValue>> DotNetRef; protected override bool TryParseValueFromString(string value, out TValue result, out string validationErrorMessage) { if (value == "null") { value = null; } if (typeof(TValue) == typeof(string)) { result = (TValue)(object)value; validationErrorMessage = null; return true; } else if (typeof(TValue) == typeof(int) || typeof(TValue) == typeof(int?)) { int.TryParse(value, NumberStyles.Integer, CultureInfo.InvariantCulture, out var parsedValue); result = (TValue)(object)parsedValue; validationErrorMessage = null; return true; } throw new InvalidOperationException($"{GetType()} does not support the type '{typeof(TValue)}'."); } protected override void OnInitialized() { base.OnInitialized(); DotNetRef = DotNetObjectReference.Create(this); } protected override async Task OnAfterRenderAsync(bool firstRender) { await base.OnAfterRenderAsync(firstRender); if (firstRender) { await JSRuntime.InvokeVoidAsync("select2Component.init", Id); await JSRuntime.InvokeVoidAsync("select2Component.onChange", Id, DotNetRef, "Change_SelectWithFilterBase"); } } [JSInvokable("Change_SelectWithFilterBase")] public void Change(string value) { if (value == "null") { value = null; } if (typeof(TValue) == typeof(string)) { CurrentValue = (TValue)(object)value; } else if (typeof(TValue) == typeof(int)) { int.TryParse(value, NumberStyles.Integer, CultureInfo.InvariantCulture, out var parsedValue); CurrentValue = (TValue)(object)parsedValue; } else if (typeof(TValue) == typeof(int?)) { if (value == null) { CurrentValue = (TValue)(object)null; } else { int.TryParse(value, NumberStyles.Integer, CultureInfo.InvariantCulture, out int parsedValue); CurrentValue = (TValue)(object)parsedValue; } } } }

• js:

 window.select2Component = { init: function (Id) { //Initialize Select2 Elements $('#' + Id).select2(); }, onChange: function (id, dotnetHelper, nameFunc) { $('#' + id).on('select2:select', function (e) { dotnetHelper.invokeMethodAsync(nameFunc, $('#' + id).val()); }); }, }