Javascript & jquery : Unable to increment within a form

Question

I got a simple increment function like this:

  $(function(){
    $("#inc").click(function(){
        var value = parseInt($(":text[name='ice_id']").val()) + 1;
        $(":text[name='ice_id']").val(value);
    });
    $("#dec").click(function(){
        var value = parseInt($(":text[name='ice_id']").val()) - 1;
        $(":text[name='ice_id']").val(value);
    });
});

the ice_id text field is embedded within a form

<form id="masterSubmit" name="masterSubmit" action="" method="post">
     <td><input id="ice_id" type="text" name="ice_id" size="16" maxlength="15"></td>
</form>

When I try now to increment , it successfully increments a number, but shows the following weird behavior: It 'refreshes' the site, so that the content of the text field is gone. This behavior disappears, if I comment out the form tags ...unfortunately the form tags are required for an AJAX-submit.

Are there any ways to avoid this problem?

Thanks in advance for any hints and best regards

Daniyal

Answer 1

just do a return false;

$(function(){
    $("#inc").click(function(){
        var value = parseInt($(":text[name='ice_id']").val()) + 1;
        $(":text[name='ice_id']").val(value);
        return false;
    });
    $("#dec").click(function(){
        var value = parseInt($(":text[name='ice_id']").val()) - 1;
        $(":text[name='ice_id']").val(value);
        return false;
    });
});

you may also improve your codes to:

$(function(){
    $("#inc").click(function(){

        $(":text[name='ice_id']").val(function(index, value) { return value++; });
        return false;

    });
    $("#dec").click(function(){

        $(":text[name='ice_id']").val(function(index, value) { return value--; });
        return false;

    });
});

Answer 2

You can also try out the jQuery Increment plugin. I designed it for just such a purpose. In addition to your "inc" & "dec" elements, you can add keyboard (U/D arrow) and mousewheel support to your form input elements