通过ajax传递价值

I am new to ajax and i don't have much idea about ajax. I am trying to pass the value from url using ajax but i am not being able to do so. I have done few search on google and found some ajax function code and i tried to implement on my code but one code is not working and another code is giving error. I have left both code below:-

error:-1 ajax code

  <script> function loadXMLDoc(loadXMLDoc) { var xmlhttp; if


(window.XMLHttpRequest)   {
 Safari   xmlhttp=new XMLHttpRequest();   } else   {
 IE5   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");   }
 xmlhttp.onreadystatechange=function()   {   if (xmlhttp.readyState==4
 && xmlhttp.status==200)
     {
     document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
     }   } xmlhttp.open("GET","1.php?check=<?php if(isset($_GET['check'])){echo $_GET['check'];}else{echo "i am
 mad";} ?>&name="+loadXMLDoc,true); xmlhttp.send(); } </script>

html+php code

<?php if(isset($_GET['check'])){echo $_GET['check'];} ?> <?php
 if(isset($_GET['name'])){echo $_GET['name'];} ?> <div id="myDiv"><h2
 style="display:none;">Let AJAX change this text</h2></div> <input
 type="text" onChange="loadXMLDoc(this.value)">

error:- 2 ajax code:

<script>
$(document).ready(function () {
    $("input#delete-btn").click(function(){
        $.ajax({
            type: "GET",
            url: "1.php",  
            data: {id: 1234 } 

        });
    });
});
</script>

html+php code:

 <?php
 if(isset($_GET['id'])){echo $_GET['id'];} ?> `<div id="myDiv"><h2 style="display:none;">Let AJAX change this text</h2></div>`

 <input type="text" onChange="loadXMLDoc(this.value)">

I just want to pass the value from url to the same page using ajax but i am not being able to do so. Hope i will get help over here. Thank You in advance.

well, the data is passed as the body of the request. Set your Content-type in your header request to application/x-www-form-urlencoded so that PHP can $_GET[] it.

i think you are asking to pass value into databse

<html>
<head>
</head>
<body>


 <form>
  enter digit : <input  type="text" id="id" name="id"  /> <br />
    <input type='button' onclick='showUser(this.value)' value='select'/>


   
</form>
<br>
<div id="txtHint"><b>Person info will be listed here...</b></div>

<script>
function showUser() {
                  httpRequest = new XMLHttpRequest();

    if (!httpRequest) {
      alert('Giving up :( Cannot create an XMLHTTP instance');
      return false;
    }
    var id =  document.getElementById("id").value;
    httpRequest.onreadystatechange = alertContents;
    
    httpRequest.open("GET", "http://localhost/cart/guser.php?id="+id+"&rand="+true);
    httpRequest.send();
    
  }
  function alertContents() {
    if (httpRequest.readyState === XMLHttpRequest.DONE) {
      if (httpRequest.status === 200) {
       document.getElementById("txtHint").innerHTML = httpRequest.responseText;
                                       }
    }      
    var id = document.getElementById('id').value;    
     
    }

</script>

</body>
</html>

as this progrm is to show the details of the user but there is error in the code in passing the value

</div>