Dropdownlist get value out ddl and use it above

问题

I'm trying to make a dropdownlist of the months. When the user select a month, the javascript fills the setter with the chosen value. Now I want to use that value above. So I made a form around my select with the action 'Onchange' and use the getMaand to calls the chosen month.

Is there something wrong with the form? Because when I put this in comment, I get the dropdownlist with the months, when I put it in code, he prints every month in one line.

I'm not an expert in Java, is it correct to use Onchange in the form and in the select?

    int m = -1;
    HTMLCode += "<form onchange=\"window.open('availability.jsp?user=99&clickeddate="+dateFormat.format(today.getTime())+"&month=" + avail.getMaand() + "','_self')\"";
    HTMLCode += "<select onchange='javascript:setMonth(\"" + m + "\");'>";
    for (m=today.get(Calendar.MONTH); m<12; m++){    
    if(month == m)
    HTMLCode += "<option value='" + m + "' selected>" + maand_voluit[m]+ "</option>";
    else
    HTMLCode += "<option value='" + m + "'>" + maand_voluit[m] + "</option>";
    }
    HTMLCode += "</select>";
    HTMLCode += "</form>";

Kind regards

回答1:

You don't specify a value for month

Try this:

int month = today.get(Calendar.MONTH);
HTMLCode += "<form onchange=\"window.open('availability.jsp?   user=99&clickeddate="+dateFormat.format(today.getTime())+"&month=" + avail.getMaand() + "','_self')\"";
HTMLCode += "<select onchange='javascript:setMonth(\"" + m + "\");'>";
for (int m=0; m<12; m++){    
if(month == m)
HTMLCode += "<option value='" + m + "' selected>" + maand_voluit[m]+ "</option>";
else
HTMLCode += "<option value='" + m + "'>" + maand_voluit[m] + "</option>";
}
HTMLCode += "</select>";
HTMLCode += "</form>";

来源：https://stackoverflow.com/questions/16010696/dropdownlist-get-value-out-ddl-and-use-it-above

标签

java

servlets

drop-down-menu

onchange