html - JavaScript - Outputting a line with Document Write -

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i trying output line javascript document.write function, however, on submitting form, line flashes , disappears

any thoughts?

<!doctype html>     <html>     <head>         <title>form validation</title>     </head>     <body>          <script type="text/javascript">             function checkage() {                  var x = document.forms['myform']['age'].value;                 if(x < 18) {                     document.write("<p>you young. form not submitted</p>");                 } else {                     document.write("form sent successfully");                 }             }              function tips() {                 alert("please enter name in name box, \nand age in age box.\nyou have on 18 submit form");             }         </script>          <form id="myform" action="formvalidation.html" onsubmit="checkage();">                 name: <input type="text" name="text" id="name">             age: <input type="text" name="age" id="age">             <input type="submit" value="submit">             <input type="button" value="help" id="hbtn" onclick="tips();">         </form>     </body> </html>

you can't use document.write() print on current page.

calling document.write() automatically call document.open() clears current document , present content cleared.

alternatively can use html <div id="result"></div> , change it's value this,

document.getelementbyid("result").innerhtml = "some text";

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