J2EE - Auto Populate Form Fields

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Auto Populate Form Fields

How to Auto Populate Form fields in HTML/JSP page with data retrieved from an Oracle Database?

Total Answers and Comments: 1

Last Update: February 26, 2009 Asked by: anuantony

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February 25, 2009 21:44:17

sachin.jain.mca

Member Since: January 2007 Contribution: 3

RE: Auto Populate Form Fields

with the help of ajax you can easily populate form fields.

Step you need to do is
1. Make a servlet that give response in form of XML to HTML form.
2. call the servlet fron HTML with the help of XMLHttpRequest Object through javascript .
3. got and parse the XML string send by servlet and populate form field.

//dummy code
public class myServlet extends HttpServlet
{
public void doGet(HttpServletRequest request HttpServletResponse response)
throws ServletException IOException {

String inputFiled request.getParameter("InputFiledName");
//Your JDBC code or call of you Model
//create xml string
StringBuffer lsbrXMLString new StringBuffer();
lsbrXMLString.append("<root>");

lsbrXMLString.append("<InputFiledName>");
lsbrXMLString.append("value Got from Database");
lsbrXMLString.append("</InputFiledName>");
lsbrXMLString.append("</root>");
response.setContentType("text/xml;charset UTF-8");
response.setHeader("Cache-Control" "no-cache");
response.getWriter().write(lsbrXMLString.toString());
}

}

//call servlet
function getFieldValue(){
var url <servlet url>;
var req initRequest(url);
req.onreadystatechange
function() {
if (req.readyState 4) {
if (req.status 200) {
populateFormField(req.responseXML);
} else if (req.status 204){
alert('erroe');
}
}
};
req.open("GET" url true);
req.send(null);
}
//create request object
function initRequest(url) {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else if (window.ActiveXObject) {
isIE true;
return new ActiveXObject("Microsoft.XMLHTTP");
}
}

//get response from servlet parse and field in folm field
function populateFormField(responseXML){

lobjroot responseXML.getElementsByTagName("root")[0];
if (lobjroot.childNodes.length < 0) {
formField.value lobjroot.getElementsByTagName("InputFiledName")[0].childNodes[0].nodeValue;
}

}

You can also use other ajax based solutions like dojo json DWR etc.

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