失去焦点时检查数据库中是否已存在电子邮件 ID

发布于 2024-10-22 12:07:45 字数 295 浏览 2 评论 0原文

我想检查输入的电子邮件 ID 是否已存在于我的数据库中。为此，我需要文本框失去焦点事件，以便我可以在更新面板触发器中异步调用它。而在我的事件中，我可以检查输入的值是否存在于数据库中。

我尝试过：

txtEmailId.Attributes.Add("onblur", "javascript:CheckEmailIdIsExist()");

如果是这样，CheckEmailIdIsExist() javascript 方法中应该包含什么？如何从 javascript 函数异步检查数据库值？

原文

I want to check the entered email id already exists in my database or not. For that I need the Text box lost focus event so that I can call it in update panel trigger asynchronously. whereas in my event I can check whether the entered value exists in database or not.

I tried:

txtEmailId.Attributes.Add("onblur", "javascript:CheckEmailIdIsExist()");

If so, the what should be inside CheckEmailIdIsExist() javascript method? how to check database values asynchronously from javascript function?

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z祗昰~ 2024-10-29 12:07:46

看看使用 jQuery 对站点上的 WebMethod 进行 AJAX 调用：

function CheckEmailIdIsExist(args) {
   var loc = window.location.href;
   loc = (loc.substr(loc.length - 1, 1) == "/") ? loc + "default.aspx" : loc;
   $.ajax({
       type: "POST",
       url: loc + "/" + IsUniqueEmailAddress,
       data: "{" + args + "}",
       contentType: "application/json; charset=utf-8",
       dataType: "json",
       success: onSuccess,
       fail: onFail
   });
}

这将在您的服务器上：

[WebMethod]
public static bool IsUniqueEmailAddress(string emailAddress)
{
    // do some processing here
    return true;
}

我认为您需要修改调用 JavaScript 函数的方式，因为您需要传递控件 onblur=" 的值javascript:CheckEmailIdIsExist(this.value);"

look at using jQuery to make an AJAX call to a WebMethod on your site:

function CheckEmailIdIsExist(args) {
   var loc = window.location.href;
   loc = (loc.substr(loc.length - 1, 1) == "/") ? loc + "default.aspx" : loc;
   $.ajax({
       type: "POST",
       url: loc + "/" + IsUniqueEmailAddress,
       data: "{" + args + "}",
       contentType: "application/json; charset=utf-8",
       dataType: "json",
       success: onSuccess,
       fail: onFail
   });
}

This would be on your server:

[WebMethod]
public static bool IsUniqueEmailAddress(string emailAddress)
{
    // do some processing here
    return true;
}

I think you will need to modify how you call the JavaScript function because you will need to pass the value of the control onblur="javascript:CheckEmailIdIsExist(this.value);"

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