MVC自动完成验证 [英] MVC Autocomplete validation
问题描述
在我的MVC应用程序中,我有一个使用JQuery / AJAX自动完成的View,其中这是一个摘录;
In my MVC app I have this View that uses JQuery/AJAX autocomplete, of which this is an extract;
<input type="search" name="searchPrimaryTrade" id="searchPrimaryTrade"
data-scd-autocomplete="@Url.Action("AutocompletePrimaryTrade", "DataService")"
style = "width: 300px;" data-val="true" class="primaryTrade required" data-val-required="Must enter a Primary Trade" />
<input type="button" id="ResetPrimaryTrade" value="Reset" class="resetSearch" data-scd-target-searchId="searchPrimaryTrade" style="margin-top:-6px; height:30px;"/><br/>
@Html.HiddenFor(model => model.PrimaryTradeId)
@Html.ValidationMessageFor(model => model.PrimaryTradeId, "*")
当用户选择一个项目进行自动完成时,我使用JQuery来填充隐藏字段; @ Html.HiddenFor(model => model.PrimaryTradeId)
。
When the user selects an item for autcomplete, I use JQuery to populate the hidden field; @Html.HiddenFor(model => model.PrimaryTradeId)
.
我的老板告诉我,如果用户在此字段中输入值,但未从自动填充中选择,然后当他点击该字段时,应立即显示错误消息。
My boss has told me that if the user enters a value in this field, but not selected from autocomplete, then when he clicks out of that field, an error message should display straight away.
如何实施那个?
推荐答案
你可以像这样创建一个自定义验证属性:
You can create a custom validation attribute like this:
public class PrimaryTradeAttribute : ValidationAttribute
{
public override bool IsValid(object value)
{
if (value != null && value is int)
{
var unitOfWork = new UnitOfWork();
int primaryTradeId = (int)value;
// Code to check if the PrimaryTradeId exists in the database...
if (unitOfWork.PrimaryTradeRepository().Find(primaryTradeId) == null)
{
return false;
}
}
return true;
}
}
然后,您可以在模型中使用此属性这个:
Then, you can use this attribute in your Model like this:
[PrimaryTrade]
public int PrimaryTradeId { get; set; }
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