Question

i newbie this my first project,I don’t know how to resolve any problems about the repetition of data
i have an input page.
it consist of 2 textfield:

1. Model,

2. Serial,

and one combobox:
1. line.

i want if there is input twice,
I mean here is a double input data,
will be out warning “data already exists”.

how do i do that?i try like this but doesn’t work:

 $("#input").click(function() {
         if($("#submit").valid()) {
                 var params=$("#submit").serialize();
                 $.ajax({
                         type:"post",
                         url:"process1.php",
                         data:params,
                         cache :false,
                         async :false,
                         success : function() {
                                    $('input[name^="text"]').change(function() {
                                          var $current = $(this);
                                          $('input[name^="text"]').each(function() {
                                                 if ($(this).val() == $current.val() && $(this).attr('id') != $current.attr('id'))
                                                 {
                                                    alert('data already exists!');
                                                    }
                                          });
                                    });
                                  $("#showmodel").val($("#model").val());
                                  $("#showline").val($("#line").val());

Answer 1

$(function() {
        $("#input").click(function(e) {
            var itemExists = false;
            var txt = $("#Text1").val();
            e.preventDefault();
            $("#Select1 option").each(function() {
                if ($(this).text() == $.trim(txt)) {
                    itemExists = true;
                    alert('Item already exists');
                }
            });

          if (!itemExists) {
          $("#Select1").append("<option value=\"1\">" + txt + "</option>");
          $("#Text1").val('');
          }
        });
    });