send id from jsp to struts action

[bubu lina]

Hello
i have problems in sendint the id of a html selected option to a struts action. i use javascript to get the parameter and show it in an alert. it shows the correct value.

  

<form action="/test" method="post">
    <select name="rows" id="rows" onchange="getNrRows(this);">
		<option value="1">1</option>
		<option value="2">2</option>
	</select>
</form>
  

the js code:

 rows= document.getElementById("rows").value;   

but now in the strut action action:

 String rows= request.getParameter("rows");   

I don't get why on request the value() is null......
any ideas? thank you

[Ankit Garg]

i have problems in sending the id of a html selected option to a struts action

This is a little confusing. Are you using an AJAX request to send request parameters, if yes, then show us the code for making the ajax request. Also as per what you said, the value is correct in JS but is null in the action, is it correct??

[Lorand Komaromi]

How are you submitting the form? Maybe there is a submit button in another form, which gets submitted instead of this!

[bubu lina]

i am using just javascript to get the selected option.
this being a struts app, i have declared a bean in struts.xml that connects the action to the view. so from the action page i send data to the view page and when the user selects something i want to sent back a value on request.
this should have been as easy as that but something i am missing.
i first used a function(already tested in other examples) to get the value from request :

  public static final synchronized int getIntParam(final HttpServletRequest request, final String paramKey, final int defaultValue) {
int param = defaultValue;     
param = Integer.parseInt(request.getParameter(paramKey));
return param;
}  

and so to get the value from the view i used:

  int rows= Utils.getIntParam(request, "rows", -1);   

This worked with a spring project.
and now here it does not.

[Lorand Komaromi]

You have to submit the form for the selected value to be available on the server side...

[Swastik Dey]

i send data to the view page and when the user selects something i want to sent back a value on request.

Are you actually sending the value? In what way is the form getting submitted? Neither there seems to be any submit button nor there seems to be any ajax call?

[bubu lina]

  

	function getNrRows(ctrl){
		rows= document.getElementById("rows").value;
		document.forms[0].submit();
		alert("rows:"+rows);
		
		return rows;
	 }
  

and on change in the form this function is called:" onchange="getNrRows(this);"

[Lorand Komaromi]

Is this the only form on your page..?

[bubu lina]

yes

[Swastik Dey]

So, where is the form getting submitted? What about the action??

  
  

	function getNrRows(ctrl){
		rows= document.getElementById("rows").value;
                document.forms[0].action="/test";
		document.forms[0].submit();
		//alert("rows:"+rows);
		
		//return rows;
	 }
  


  

[Swastik Dey]

your form is not getting submitted through submit click, so form action attribute is not going to help. You are submitting through js call, so here you need to specify the action.

[bubu lina]

i specified in the form the name of the action. "/test.do".
or you are saying something else?

[Swastik Dey]

You need to specify the action url, whatever it is.

[Swastik Dey]

See my js code above

document.forms[0].action="url where the form is to be submitted"

[bubu lina]

you were right. Thank you