Dynamically added input fields with javascript, what are these fields' param names?
Question
I'm using the following example I found on the inte.net to dynamically build a list of input fields.
It seems to work fine, but when I submit the form, param names do I use to put the data from the HttpServletRequest?
Thanks, Rob
<HTML>
<HEAD>
<TITLE> Add/Remove dynamic rows in HTML table </TITLE>
<SCRIPT language="javascript">
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var cell1 = row.insertCell(0);
var element1 = document.createElement("input");
element1.type = "checkbox";
cell1.appendChild(element1);
var cell2 = row.insertCell(1);
cell2.innerHTML = rowCount + 1;
var cell3 = row.insertCell(2);
var element2 = document.createElement("input");
element2.type = "text";
cell3.appendChild(element2);
}
function deleteRow(tableID) {
try {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
for(var i=0; i<rowCount; i++) {
var row = table.rows[i];
var chkbox = row.cells[0].childNodes[0];
if(null != chkbox && true == chkbox.checked) {
table.deleteRow(i);
rowCount--;
i--;
}
}
}catch(e) {
alert(e);
}
}
</SCRIPT>
</HEAD>
<BODY>
<form name="myform" action="myServlet" method="post">
<INPUT type="button" value="Add Row" onclick="addRow('dataTable')" />
<INPUT type="button" value="Delete Row" onclick="deleteRow('dataTable')" />
<TABLE id="dataTable" width="350px" border="1">
<TR>
<TD><INPUT type="checkbox" name="chk"/></TD>
<TD> 1 </TD>
<TD>
<INPUT type="text" />
</TD>
</TR>
</TABLE>
<input type="submit" value="Go!"/>
</form>
</BODY>
</HTML>
1 answers
solution1
0 ACCPTED 2012-04-05 16:07:34
You need to give your input objects a "name" attribute (or 'id' if your JSP isn't using name, but name is preferred I believe)
Try this:
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var cell1 = row.insertCell(0);
var element1 = document.createElement("input");
element1.type = "checkbox";
element1.name = "chk_input"; //*** EDIT ***
cell1.appendChild(element1);
var cell2 = row.insertCell(1);
cell2.innerHTML = rowCount + 1;
var cell3 = row.insertCell(2);
var element2 = document.createElement("input");
element2.type = "text";
element2.name = "text_input"; //*** EDIT ***
cell3.appendChild(element2);
}
Then your params will be named "text_input" and "chk_input". You can replace this with something more meaningful of course.
I haven't used JSP in a while (I assume that's what HttpServletRequest is about...) so I can't remember how to access them, but those will be the keys.
EDIT: If you're dynamically adding rows, I suppose you need a unique name. It seems you are keeping track of the row count, so you could just do something like:
...
element2.name = 'text-input-' + rowCount;
...
then in your controller (whatever processes the form) you could use the rowCount to set up a loop (for i.. rowcount) where you check for keys like "text-input-" + CastToString(i) for each row in the form.
If you're not passing rowCount with the form, just add an input of type hidden with a name='rowCount' and a value of the rowCount var. You can do this when the user clicks the submit button so you don't have to update it with each row)
form = document.getElementById('myform');
rc = document.createElement('input');
rc.type = 'hidden'
rc.value = rowCount; // make sure it's in scope!!!
form.appendChild(rc);
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