使用javascript和asp.net启用和禁用按钮 [英] Enable and disable button using javascript and asp.net

问题描述

我正在检查用户是否存在于数据库中（如果存在）我将消息显示为已存在的用户，然后我需要禁用注册按钮，如果不是我需要启用它。

I am checking if user exists in database if exists I am showing message as "existed user" and then I need to disable the signup button if not I need to enable it.

我无法启用和禁用注册按钮。

I am unable to enable and disable the sign Up button.

任何人都可以帮我解决此问题吗？

Can anyone help me in this issue?

这是我的代码：

 <script type="text/javascript">
     $(function () {
         $("#<% =btnavailable.ClientID %>").click(function () {
             if ($("#<% =txtUserName.ClientID %>").val() == "") {
                 $("#<% =txtUserName.ClientID %>").removeClass().addClass('notavailablecss').text('Required field cannot be blank').fadeIn("slow");

             } else {
                 $("#<% =txtUserName.ClientID %>").removeClass().addClass('messagebox').text('Checking...').fadeIn("slow");
                 $.post("LoginHandler.ashx", { uname: $("#<% =txtUserName.ClientID %>").val() }, function (result) {
                     if (result == "1") {
                         $("#<% =txtUserName.ClientID %>").addClass('notavailablecss').fadeTo(900, 1);
                       document.getElementById(#<% =btnSignUp.ClientID %>').enabled = false;
                     }
                     else if (result == "0") {
                         $("#<% =txtUserName.ClientID %>").addClass('availablecss').fadeTo(900, 1);
                        document.getElementById('#<% =btnSignUp.ClientID %>').enabled = true;
                     }
                     else {
                         $("#<% =txtUserName.ClientID %>").addClass('notavailablecss').fadeTo(900, 1);
                     }
                 });
             }
         });

         $("#<% =btnavailable.ClientID %>").ajaxError(function (event, request, settings, error) {
             alert("Error requesting page " + settings.url + " Error:" + error);
         });
     });
</script>

推荐答案

不幸的是你的问题就像它们之间的区别一样小已启用且已停用

Unfortunately your problem is something as small as the difference between enabled and disabled

.enabled = true;

应该是：

.disabled = false;

这篇关于使用javascript和asp.net启用和禁用按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！