A small basic example for getting started with JQuery (1)

A small basic example for getting started with JQuery (1)_jquery

WBOY

Release： 2016-05-16 15:38:51

Original

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First show the effect achieved by this example:

When the page is just loaded, it is displayed as shown in the picture:

After entering data in the text box, the red mark of the text box disappears, as shown in the figure:

After clicking the OK button, data will be output to the page through the background, as shown in the figure:

The front-end code is as follows (asp.net):

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> 
 
<!DOCTYPE html> 
 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 
 <title></title> 
 <script src="js/jquery-1.9.1.min.js"></script> 
 <script src="js/UserVerify.js"></script> 
 <link href="css/StyleSheet.css" rel="stylesheet" /> 
</head> 
<body> 
 <form id="form1" runat="server"> 
  请输入用户名：<input type="text" class="userName" id="userName" /><input type="button" id="verifyButton" value="确定" /> 
  <div id="returnVal"></div> 
 </form> 
</body> 
</html>

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CSS()

.userName { 
 border:1px solid red; 
 background-image:url("../images/userVerify.gif"); 
 background-position:bottom; 
 background-repeat:repeat-x; 
}

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The background code of the

page is as follows:

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
 
public partial class _Default : System.Web.UI.Page 
{ 
 protected void Page_Load(object sender, EventArgs e) 
 { 
  string userName =HttpUtility.UrlDecode(Request.QueryString["userName"]); 
 
  //HttpContext.Current.Response.Write(userName); 
 
  if (userName != null) 
  { 
   Response.Write("您输入的是："+userName); 
   Response.End(); 
  } 
 
 
 } 
}

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The added UserVerify.js file is as follows:

/// <reference path="jquery-1.9.1.min.js" /> 
//上面这句话，可以在我们当前的JS里显示智能提示。 
$("document").ready(function () { 
 var userName = $("#userName"); 
 
 $("#verifyButton").click(function () { 
  var value = userName.val(); 
  if (value=="") { 
   alert("请输入用户名！"); 
  } 
  else { 
   //两次encodeURI解决中文乱码问题 
   $.get("Default.aspx&#63;userName="+ encodeURI(encodeURI(value)), function (response) { 
    $("#returnVal").html(response); 
   }); 
  } 
 }); 
 
 userName.keyup(function () { 
  var value = userName.val; 
  if (value != "") { 
   userName.removeClass(); 
  } 
  else { 
   userName.addClass(); 
  } 
 }); 
});

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A small introductory example of Jquery that is especially suitable for beginners to learn. I hope you will like it. Starting today, I will sort out the knowledge points about jquery for you. I hope you will continue to pay attention.