jsp - Set parameter of font color from javascript -
i need show text <reg id:> in red color if reg id null or empty. current implementation on alert, color not changed.
<html> <head> <script type="text/javascript"> function validateform() { var stu_regid = document.forms["detail"]["regid"].value; if ((null == stu_regid) || (stu_regid == "")) { alert("reg should not left blank"); // here change color red document.getelementsbyname("font_regid").innerhtml = "red"; return false; } } </script> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> <title>insert title here</title> </head> <body> <%!string font_regid = new string();%> <form name="detail" action="reportgenerator" method="get" onsubmit="return validateform()"> <font color=<%=font_regid%>>reg id:</font> <input type="text" name="regid"><br> // code here <input type="submit" value="submit"> </form> </body> </html>
after little more research came 1 simple solution.
i used
span
tag id , receive id in javascript. way worked me. changed font span, thing following
<span id="id_01120">reg id:</span> <input type="text" name="regid"><br> and receive following
if ((null == label_id) || (label_id == "")) { showerror(label_id, document.getelementbyid("id_01120")); return false; } and change color following
function showerror(errorfield, errorfont) { alert(errorfield.concat("should not left blank")); errorfont.style.color = "red"; }
Comments
Post a Comment