mixing javascript with java

Question

basically my problem is when I want to mix javascript with java code since I did not take the variable (var nombreRodamiento javascript) when I put the "<%" to start putting java code. please note the bold line, which is what the compiler does not like.

<script type="text/javaScript">
function moveToRightOrLeft(side) {
    var listLeft = document.getElementById('selectLeft');
    var listRight = document.getElementById('selectRight');
    if (side == 1) {//izquierda
        if (listLeft.options.length == 0) {
            alert('Ya aprobaste todos los items');
            return false;
        } else {
            var rodamientoElegido = listLeft.options.selectedIndex;
            var nombreRodamiento = listLeft.options[rodamientoElegido].text;
            move(listRight, listLeft.options[rodamientoElegido].value,
                    listLeft.options[rodamientoElegido].text);
            listLeft.remove(rodamientoElegido);
            <%
            **String nombreRodamiento = '%> nombreRodamiento;<%'**
            for (int i=0;i<listaItems.size();i++){
                if (listaItems.get(i).equals(nombreRodamiento))
                    listaItems.remove(i);
            }
            %>
            if (listLeft.options.length > 0) {
                listLeft.options[0].selected = true;
            }
        }
    }
}
</script>

Regards

should not this String nombreRodamiento = '%> nombreRodamiento;<%' be String nombreRodamiento = "%> nombreRodamiento;<%"; ? — Elbek
– Elbek, Commented Jul 3, 2013 at 2:25

Keith · Accepted Answer · 2013-07-03 02:36:10Z

2

Assuming that this is all inside of a JSP. The java code (scriptlet, everything inside the <% %> tags) will execute server side, and the javascript will execute client side (in the user's browser). Yet you seem to be assigning a java variable the value of a javascript variable, nombreRodamiento. That is not going to work. The javascript is just text, with no values, execution context, etc, whenever the scriplet is being evaluated.

answered Jul 3, 2013 at 2:36

Keith

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user2357112 · Accepted Answer · 2013-07-03 02:02:03Z

1

Java strings require double quotes, and you're missing a semicolon, which Java will not automatically insert.

answered Jul 3, 2013 at 2:02

user2357112

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4 Comments

user2544750 Over a year ago

it says them <code> An error occurred at line: 27 in the jsp file: /jsp/Cotizacion/AprobarCotizacion.jsp String literal is not properly closed by a double-quote 24: listLeft.options[rodamientoElegido].text); 25: listLeft.remove(rodamientoElegido); 26: <% 27: String nombreRodamiento = "%> nombreRodamiento;<%"; </code>

user2357112 Over a year ago

The %> in the string literal might be treated as ending the embedded Java. You may have to escape it somehow.

Jafar Ali Over a year ago

Guys the line is teying to assign a value from client side to a variable. on server side. what are you discusing about. its not possible. if you need any solution then plz explain what you want to achive.

user2357112 Over a year ago

I have no idea how the Javascript and the Java interact here. I'm just addressing syntax errors. You should probably be commenting on the question instead of this answer.

Jafar Ali · Accepted Answer · 2013-07-08 07:23:30Z

0

Assuming this is a part of jsp file java code and js code executes separately. first java code get execute on server side and then the javascript code and that is on client side. Infact the java scriplet in jsp renderes the js code to be executed later on client which in this case is a browser.
Hence one cannot assign javascript variable value to a java variable but the reverse is possible.T

Edit:

I can give you the steps as I dont know your server side implementation.

render the page. You must be rendering the list by some type of array or equivaletn object on server side. save both right and left side element on session.
when the list box do some element exchange. exucute your js code.
you have to update the same on server side so send the selected element index and side information to server side using ajax.
update the server side list objects in the session accordingly. Update db if needed.
From next time render this list box suing this objects on ths server side sessions.

Hope this helps.

edited Jul 8, 2013 at 7:23

answered Jul 3, 2013 at 2:53

Jafar Ali

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6 Comments

user2544750 Over a year ago

and then how I can fix it?

user2544750 Over a year ago

I need pass the contents of the listbox (select with many options) to an element of type List <String>. just that. and I want to do in the javascript I'm detailing because that is where there is movement of a listbox to another.

Jafar Ali Over a year ago

Why you want the value fron javascript to java? can't you achive what you want through javascript alone.

Jafar Ali Over a year ago

You want to update java side that the option has be moved from one listbox to another. you can save the value of list box on serverside session and update it using ajax.

Jafar Ali Over a year ago

Next time you want to render the list box render them from this valies from session. Hope this solve your problem.

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