Question

I have a Login Page Contains two text boxes one is user name,password and one button if the two textboxes are empty that time how i can avoid post back of the buuton if any value enterd that time only postback occuers,,,, not using required fiekd validator any method is avilable in javascript.......

Answer 1

use和以下法律也使你想要做的事情。

$(document).ready(function() {
        // Save Button
        $( #<%= TestButton.ClientID %> ).click(function(e) {
        var username = $( #<%= usernameTextBox.ClientID %> ).val();
        var email = $( #<%= passwordTextBox.ClientID %> ).val();
        if ( username.length == 0 || email.length == 0 ||) {
                e.preventDefault();
        });
}

Answer 2

是的,根据我的说法,你可以做一件事就是在点击纽顿时检查检查箱子值。

html部分

<asp:button onclientClick="return onclick()" id="btnLogin" runat="server" >

或 in

btnLogin.attribute.Add("onclick","return onclick()");

function onclick()
{
  var bool = true;
  if($("#username").val()==="")//document.getElementById("username").value
    bool = false;
  if($("#password").val()==="")//document.getElementById("password").value
    bool = false;

  return bool;
}

如果你不使用jquery,则使用部分评论来获取价值

友情链接