JS Authentication Email Address Format Method Summary _javascript Skill

The example of this article describes the method of JS authentication email address format. Share to everyone for your reference, specific as follows:

Example 1:

Copy Code code as follows:

<asp:textbox id= "Txt_email" runat= "Server" onblur= "Checkrate" (this.id) ></asp:TextBox>

function checkrate (input)
{
  var re =/^[_ ". 0-9a-z-]+@ ([0-9a-z][0-9a-z-]+.) {1,4} [A-z] {2,3}$/i;  
  var nubmer = document.getElementById (input). value;
   if (!re.test (Nubmer))
  {
    alert ("Please enter the correct format of the mailing Address");
    document.getElementById (input). Value = "";
    return false;
   }
}

Example 2:

<script type= "Text/javascript" >
function Isvalidmail () {
var textval = document.getElementById ("　　TextBox1 "). Value;
var Regex =/^ (?: \ W+\.?) *\w+@ (?: \ W+\.)　　*\w+$/;
if (Regex.test (Textval)) {
alert (true);
else {
if (Textval = = "") {
alert ("Please enter your email address!!　　");
return false;
else {
alert ("Hello, you entered incorrectly, please re-enter;");
   document.getElementById ("TextBox1"). Value = "";
return false;
}
}
</script>

Copy Code code as follows:

<asp:textbox id= "TextBox1" runat= "Server" ></asp:TextBox>
<asp:button id= "Button3" runat= "Server" text= "button" onclientclick= "Return Isvalidmail ()" onclick= "Button3_Click "/>

I hope this article will help you with JavaScript programming.