我正在Blazor页面上添加新对象。对象“ RepairOrder”具有对象“ RepairSection”的列表。
页面上有一个区域，将在列表“ RepairOrder”。“ RepairSections”中循环显示元素：
<div class="col-lg-10">
@if (sections.Count > 0)
{
foreach (var sec in sections)
{
<h3>Section @sec.SectionNumber</h3>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-5">
<label for="Failure" class="control-label">Failure: </label>
<input for="Failure" class="form-control" bind="@sec.Failure" readonly />
</div>
<div class="col-lg-1"></div>
<div class="col-lg-1">
<label><input type="checkbox" checked="@IsCApprovedChecked(sec)" /> Warranty</label>
</div>
<div class="col-lg-2">
<label><input type="checkbox" value="@IsWarrantyChecked(sec)" /> Repair Approved</label>
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="AdminComments" class="control-label">Admin Comments: </label>
<input for="AdminComments" class="form-control" bind="@sec.AdminComments" readonly />
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="TechComments" class="control-label">Tech Comments: </label>
<input for="TechComments" class="form-control" bind="@sec.TechComments" readonly />
</div>
</div>
}
}
</div>
将列表中的所有当前部分添加到页面后，将出现一个用于添加新部分的按钮。单击按钮后，该函数会将布尔值更改为true，以打开模态对话框。模态包含用于输入新节元素的字段。
调用以打开模式的函数：
protected void AddSectionCalled()
{
_newSection = new RepairSection();
this.isAddNew = true;
}
模式代码：
<div class="modal" tabindex="-1" style="display:block" role="dialog">
<div class="modal-dialog modal-dialog-scrollable modal-xl">
<div class="modal-content">
<div class="modal-header">
<h3 class="modal-title">New Repair Section</h3>
<button type="button" class="close" onclick="@CloseModal"><span aria-hidden="true">X</span></button>
</div>
<div class="modal-body">
<form>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-2">
<label for="sectionLetter" class="control-label">Section: </label>
<input for="sectionLetter" class="form-control" bind="@_newSection.SectionNumber" />
</div>
<div class="col-lg-1"></div>
<div class="col-lg-2">
<label><input type="checkbox" bind="@_newSection.Warranty" /> Warranty</label>
</div>
<div class="col-lg-2">
<label><input type="checkbox" bind="@_newSection.CustomerApproved" /> Repair Approved</label>
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="_failure" class="control-label">Failure: </label>
<input for="_failure" class="form-control" bind="@_newSection.Failure"/>
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="_adminComments" class="control-label">Admin Comments: </label>
<input for="_adminComments" class="form-control" bind="@_newSection.AdminComments" />
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="_techComments" class="control-label">Tech Comments: </label>
<input for="_techComments" class="form-control" bind="@_newSection.TechComments"/>
</div>
</div>
<br/>
<button class="btn btn-primary float-left" onclick="AddNewSection">Add New Section</button>
</form>
</div>
</div>
</div>
</div>
单击“添加新部分”按钮时，将从模态中收集的信息创建的“ _newSection”对象添加到加载页面时最初循环通过的“部分”列表中。
private void AddNewSection()
{
sections.Add(_newSection);
this.StateHasChanged();
this.isAddNew = false;
}
如您所见，在将新部分添加到部分列表之后，我添加了“ StateHasChanged（）”。但是，该页面不会呈现以显示新部分。
我最初是在页面“ OnInitAsync（）”事件上创建伪数据的，该事件在显示数据之前已向节列表加载数据。这样，我可以确保页面正确显示了列表中的内容。
在用户向列表中添加新对象之后，如何使页面重新呈现列表中的信息？
----编辑-----
下面是整个页面的代码。我会在周末尽量减少这种情况，但是这里确实没什么。
@page "/AddRepairOrder"
@using ShopLiveWebVersion2._0.Models
@using ShopLiveWebVersion2._0.DataAccess
@using ShopLiveWebVersion2._0.Services
@using ShopLiveWebVersion2._0.Data
@inject IUriHelper UriHelper
@inject RepairOrderContext context
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10"><h1>Create New Repair Order</h1></div>
</div>
<br /><br />
<form id="AddROForm">
<div class="form-group">
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-2">
<label for="ControlNumber" class="control-label">Repair Order #: </label>
<input for="ControlNumber" class="form-control" bind="@ro.ControlNumber" maxlength="15" required />
</div>
<div class="col-lg-1">
<label for="TagNumber" class="control-label">Tag #: </label>
<input for="TagNumber" class="form-control" bind="@ro.TagNumber" maxlength="8" />
</div>
<div class="col-lg-3">
<label for="VIN" class="control-label">VIN: </label>
<input for="VIN" class="form-control" bind="@ro.VIN" maxlength="18" />
@*<small id="Chasis" class="form-text text-muted">@ro.GetChassisNumber()</small> figure out how to get chassis from vin after box looses focus*@
</div>
<div class="col-lg-2">
<label for="Make" class="control-label">Make: </label>
<input for="Make" class="form-control" bind="@ro.Make" maxlength="30" />
</div>
<div class="col-lg-2">
<label for="Madel" class="control-label">Model: </label>
<input for="Madel" class="form-control" bind="@ro.Madel" maxlength="30" />
</div>
</div>
<div class="row AddRow">
<div class="col-lg-1"></div>
<div class="col-lg-4">
<label for="Customer" class="control-label">Customer: </label>
<input for="Custoemr" class="form-control" bind="@ro.Customer" maxlength="50" />
</div>
<div class="col-lg-2">
<label asp-for="Location" class="control-label">Vehicle Location: </label>
<select asp-for="Location" class="form-control" bind="@ro.Location">
<option value="">-- Select a Location --</option>
@foreach (var loc in Location)
{
<option value="@loc">@loc</option>
}
</select>
</div>
<div class="col-lg-2">
<label asp-for="Assigned" class="control-label">Assigned: </label>
<select asp-for="Assigned" class="form-control" bind="@ro.Assigned">
<option value="">-- Select an Employee --</option>
@foreach (var emp in Employee)
{
<option value="@emp">@emp</option>
}
</select>
</div>
<div class="col-lg-2">
<label asp-for="Status" class="control-label">Status: </label>
<select asp-for="Status" class="form-control" bind="@ro.Status">
<option value="">-- Select a Status --</option>
@foreach (var st in Status)
{
<option value="@st">@st</option>
}
</select>
</div>
</div>
<br />
<div class="row"><div class="col-lg-1"></div><div class="col-lg-10"><hr id="Double" /></div></div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
@if (sections.Count > 0)
{
foreach (var sec in sections)
{
<h3>Section @sec.SectionNumber</h3>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-5">
<label for="Failure" class="control-label">Failure: </label>
<input for="Failure" class="form-control" bind="@sec.Failure" readonly />
</div>
<div class="col-lg-1"></div>
<div class="col-lg-1">
<label><input type="checkbox" checked="@IsCApprovedChecked(sec)" /> Warranty</label>
</div>
<div class="col-lg-2">
<label><input type="checkbox" value="@IsWarrantyChecked(sec)" /> Repair Approved</label>
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="AdminComments" class="control-label">Admin Comments: </label>
<input for="AdminComments" class="form-control" bind="@sec.AdminComments" readonly />
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="TechComments" class="control-label">Tech Comments: </label>
<input for="TechComments" class="form-control" bind="@sec.TechComments" readonly />
</div>
</div>
}
}
</div>
</div>
<div class="row"></div>
</div> @*Form-group*@
</form>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-9">
<br /><br />
<button class="btn btn-primary float-right" onclick="@AddSectionCalled">Add New Section</button>
</div>
</div>
@if (isAddNew == true)
{
<div class="modal" tabindex="-1" style="display:block" role="dialog">
<div class="modal-dialog modal-dialog-scrollable modal-xl">
<div class="modal-content">
<div class="modal-header">
<h3 class="modal-title">New Repair Section</h3>
<button type="button" class="close" onclick="@CloseModal"><span aria-hidden="true">X</span></button>
</div>
<div class="modal-body">
<form>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-2">
<label for="sectionLetter" class="control-label">Section: </label>
<input for="sectionLetter" class="form-control" bind="@_newSection.SectionNumber" />
</div>
<div class="col-lg-1"></div>
<div class="col-lg-2">
<label><input type="checkbox" bind="@_newSection.Warranty" /> Warranty</label>
</div>
<div class="col-lg-2">
<label><input type="checkbox" bind="@_newSection.CustomerApproved" /> Repair Approved</label>
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="_failure" class="control-label">Failure: </label>
<input for="_failure" class="form-control" bind="@_newSection.Failure" />
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="_adminComments" class="control-label">Admin Comments: </label>
<input for="_adminComments" class="form-control" bind="@_newSection.AdminComments" />
</div>
</div>
<div class="row">
<div class="col-lg-1"></div>
<div class="col-lg-10">
<label for="_techComments" class="control-label">Tech Comments: </label>
<input for="_techComments" class="form-control" bind="@_newSection.TechComments" />
</div>
</div>
<br />
<button class="btn btn-primary float-left" onclick="AddNewSection()">Add New Section</button>
</form>
</div>
</div>
</div>
</div>
}
@functions
{
private RepairOrder ro;
private RepairOrder incomingRO;
private RepairOrderDataAccess RoData;
private string chassis;
private List<string> Location;
private List<string> Employee;
private List<string> Status;
private FileService fileService;
private List<RepairSection> sections;
private bool isAddNew;
//for new repair section modal
private RepairSection _newSection;
protected override async Task OnInitAsync()
{
ro = new RepairOrder();
Location = new List<string>();
Employee = new List<string>();
Status = new List<string>();
sections = new List<RepairSection>();
isAddNew = false;
fileService = new FileService();
RoData = new RepairOrderDataAccess(context);
await LoadData();
}
private async Task LoadData()
{
Location = await Task.Run(() => fileService.ReadLocation());
Employee = await Task.Run(() => fileService.ReadEmployees());
Status = await Task.Run(() => fileService.ReadStatus());
}
public string IsCApprovedChecked(RepairSection sc)
{
if (sc.CustomerApproved == true)
{
return "checked";
}
else
{
return "";
}
}
public string IsWarrantyChecked(RepairSection sc)
{
if (sc.Warranty == true)
{
return "checked";
}
else
{
return "";
}
}
protected void AddSectionCalled()
{
_newSection = new RepairSection();
this.isAddNew = true;
}
private void AddNewSection()
{
sections.Add(_newSection);
this.StateHasChanged();
this.isAddNew = false;
}
private void CloseModal()
{
this.isAddNew = false;
}
答案 0 :(得分：1)
绑定模式表格按钮上的onclick事件的方式存在问题。
您有onclick="AddNewSection()"
-以这种方式编写它可能会被解释为纯JavaScript调用，并且如果您在浏览器工具中检查DOM，则可能会在按钮上看到onclick="AddNewSection()"。
您应该拥有onclick="@AddNewSection"
-这样，Blazor会将onclick事件连接到您的C＃方法。