使用JQUERY提交之前检查表单输入值时出现问题

Question

my code is as follows

$(document).ready(function() {

    // this is a button to add the form to the DOM tree.
    $("#submitPara").click(function() {
        $("body").append('<form id = "dimensionAndObjects" action = "#"></form>');
        some code to add some input fields, omitted...
        $('#dimensionAndObjects').append('<p><input id = "submitDO" type = "submit" value = "submit"></input></p>');
        return true;
    });

    $('#dimensionAndObjects').submit(function() {
        alert("haahhhahhaha");
        return false;
    });

});

it seems that the submit function doesn't work because the alert info doesn't appear. if i put the submit function inside the click function, it doesn't work either. what's wrong? I am a totally freshman to jQuery, thanks in Advance!

Answer 1

since the form is created dynamically you need to use event delegation

$(document).on('submit', '#dimensionAndObjects', function() {
        alert("haahhhahhaha");
        return false;
    });

Answer 2

$('#dimensionAndObjects').live('click',function(e) {
e.preventdefault();
        alert("haahhhahhaha");
        return false;// for not submit the form
return true ;// for submit the form
    });