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分享How to do this validation in asp.net?
I am new on asp.net programming.
Here I got a problem about validator
I want to write a login.aspx page, for example, there is UserName box. I need to validate two things on UserName box,
1. It must be filled. If it is empty, I will show a red message right after this box, like "UserName is empty!"
2. It must be a valid user in our database. So on server side, we will check this UserName in our database. If it is not in our database, we will show something like "Invalid user name..."
I know it is very easy to do the 1st rule with the RequireFieldValidator. But in order to do the rule 2, I need to put a Lable at the same place where the validator is. Right? But the two won't stay at the same place. So I tried to use a CustomValidator, and write the ClientValidationFunction like this:
<script language="javascript">
function ValidUserName(oSrc, args) //For rule 1
{
if(args.Value.length > 0)
args.IsValid = true;
else
args.IsValid = false;
}
</script>
And also, I have a server validate function which will process the rule 2.
But the problem is the client validate function never get called. So , do you guys have a better solution for this? I really appreciate.
Here I got a problem about validator
I want to write a login.aspx page, for example, there is UserName box. I need to validate two things on UserName box,
1. It must be filled. If it is empty, I will show a red message right after this box, like "UserName is empty!"
2. It must be a valid user in our database. So on server side, we will check this UserName in our database. If it is not in our database, we will show something like "Invalid user name..."
I know it is very easy to do the 1st rule with the RequireFieldValidator. But in order to do the rule 2, I need to put a Lable at the same place where the validator is. Right? But the two won't stay at the same place. So I tried to use a CustomValidator, and write the ClientValidationFunction like this:
<script language="javascript">
function ValidUserName(oSrc, args) //For rule 1
{
if(args.Value.length > 0)
args.IsValid = true;
else
args.IsValid = false;
}
</script>
And also, I have a server validate function which will process the rule 2.
But the problem is the client validate function never get called. So , do you guys have a better solution for this? I really appreciate.
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Overriding 2005-01-18
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CustomVlidator
beibeilong 2005-01-18
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例如你在btLogin的后台代码里面写了第二个验证的话，你可以在page_load的时候写
btLogin.Attributes.Add("onclick","return ValidUserName()");,同时你的ValidUserName函数需要修改一下return的值。这样按下按钮后，会先执行ValidUserName（），如果返回true接着执行后台代码验证rule 2
btLogin.Attributes.Add("onclick","return ValidUserName()");,同时你的ValidUserName函数需要修改一下return的值。这样按下按钮后，会先执行ValidUserName（），如果返回true接着执行后台代码验证rule 2
