在提交表单之前确定重复值

Say I have an online form, and I want to figure out whether a user is entering an email that's already in use by the system. Can I tell the system to check the field against the database as soon as the user moves their cursor / selection away from the field? Could anyone point me in the right direction if this is actually possible?

假设我有一个在线表单,我想弄清楚用户是否正在输入已经被系统使用的电子邮件。一旦用户将光标/选择移离字段,我是否可以告诉系统检查数据库中的字段?如果真的有可能,有人能指出我正确的方向吗?

5 个解决方案

#1

For this You need to call ajax when user writing an email id means on blur event as below :

为此,当用户编写电子邮件ID意味着模糊事件时,您需要调用ajax,如下所示:

    $('#yourfieldID').blur(function() {
       var val = $(this).val();
       $.ajax({
                type: 'POST',
                url: 'your url',
                data: {email: val},
                success: function (data) {
                    // check for response
                    });
                }
            });
    });

Now In file which you called in ajax url, Your need to check data which is exist in database or not and according to that you need to send response and check it in sucess part of ajax call.

现在在你用ajax url调用的文件中,你需要检查数据库中是否存在的数据,并根据你需要发送响应并在ajax调用的成功部分中检查它。

I hope you will get it.

我希望你能得到它。

5 个解决方案

#1

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