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POJavascript and JSP not reloading
 

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  1. POJavascript and JSP not reloading
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    <p>Hey guys working on some form validation on our jsp page.</p> <p>I have alert boxes coming up when you enter no value or a non numeric value in the capacity field. But after clicking "OK" the page is redirected to an error: </p> <pre><code>HTTP Status 500 - For input string: "" </code></pre> <p>OR when entering "a" in the capacity field</p> <pre><code>HTTP Status 500 - For input string: "a" </code></pre> <p>How would I reload the page instead of taking me to the error page?</p> <p>I have already tried many in built Javascript functions but still directed to the error page, like location.reload() etc. </p> <pre><code>&lt;%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"&gt; &lt;title&gt;Mars University Lab System&lt;/title&gt; &lt;link rel="stylesheet" href="style.css" type="text/css" media="screen"&gt; &lt;/head&gt; &lt;body&gt; &lt;jsp:include page="headerLecturer.jsp"/&gt; &lt;script&gt; function chkNumeric(strString) // check for valid numeric strings { var strValidChars = "0123456789.-"; var strChar; var blnResult = true; if (strString.length == 0) return false; // test strString consists of valid characters listed above for (i = 0; i &lt; strString.length &amp;&amp; blnResult == true; i++) { strChar = strString.charAt(i); if (strValidChars.indexOf(strChar) == -1) { blnResult = false; } } return blnResult; } function validateForm() { var capacity=document.forms["createLabs"]["capacity"].value; var day=document.forms["createLabs"]["day"].value; var time=document.forms["createLabs"]["time"].value; var room=document.forms["createLabs"]["room"].value; if (capacity==null || capacity=="") { alert("Capacity must be filled out"); document.createLabs.capacity.focus(); return false; } else if(day==null || day=="") { alert("Day must be filled out"); document.createLabs.day.focus(); return false; } else if(time==null || time=="") { alert("Time must be filled out"); document.createLabs.time.focus(); return false; } else if(room==null || room=="") { alert("Room must be filled out"); document.createLabs.room.focus(); return false; } else if (chkNumeric(document.createLabs.capacity.value) == false) { alert("Please check - non numeric value!"); document.createLabs.room.focus(); return false; } else if (chkNumeric(document.createLabs.room.value) == false) { alert("Please check - non numeric value!"); document.createLabs.room.focus(); return false; } var link2 = document.getElementById('submit'); link2.onclick = function () { if( confirm("Please fill in all the required fields") ) { window.location.reload(); } return false; } } &lt;/script&gt; &lt;tr&gt; &lt;td&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; &lt;div id = "centrecontent"&gt; &lt;br&gt; &lt;h3&gt;Create Labs&lt;/h3&gt; &lt;%String[] list1 = (String[])request.getAttribute("res1"); %&gt; &lt;%String[] list2 = (String[])request.getAttribute("res2"); %&gt; &lt;form name ="createLabs" ACTION="CreateLab" method="post"&gt; Subject: &lt;select name="subject_id"&gt; &lt;% for(int i=0; i&lt;list1.length; i++) { //for(int m=0; m&lt;list2.length;i++) //{ out.println("&lt;option value="+list1[i]+"&gt; "+list2[i]+" &lt;/option&gt;"); //} out.println("list1:"+list1[0]); } %&gt; &lt;/select&gt;&lt;br&gt;&lt;br&gt; Capacity: &lt;input type="text" name="capacity"/&gt;&lt;br /&gt;&lt;br&gt; &lt;input type="hidden" name="spots_left"/&gt; Day: &lt;input type="text" name="day"/&gt;&lt;br /&gt;&lt;br&gt; Time (HH:MM:SS): &lt;input type="time" name="time"/&gt;&lt;br /&gt;&lt;br&gt; Room: &lt;input type="text" name="room"/&gt;&lt;br /&gt;&lt;br&gt; &lt;input type=SUBMIT value="Submit" name="Submit" onClick="validateForm()" /&gt; &lt;/form&gt; &lt;/div&gt; &lt;jsp:include page="footer.jsp"/&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. CO@Heikkim the form action is this form "CreateLab" but the page redirects to another page when successfully completed the form.
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