如何在不使用表单操作的情况下获取文本框值并将其分配给PHP变量？

Question

I just want to ask a simple question. I am creating a validation form using PHP. And what I need to do is to get the value of my textbox and assign it to a variable. Because I need that variable for comparing. But this process is done without an action form like GET or POST. How can I create a simple jquery for this?

Here's my sample flow.

<?php

    $data_qty = fn_product_qty($product_id);
    $x = //should be the textbox qty

    if($x != $data_qty){
       //some code here....
    }
?>
.....
<input type='text' name='qty' value='1' />

Answer 1

It can be done in javascript like,

<script>
    var x='<?php echo $x;?>';
    $('button').on('click',function(){
        var qty=$('input[name="qty"]').val();
        if(x!=qty){
           alert('Both are not equal');
        }
    });
</script>

If you want in server side then use jquery ajax and php $_SESSION to compare both values.

Answer 2

You can use ajax to do this. Can do alot of things, using jquery validation . Usually when i used to compare username exists in my server-side db i extend a method from jquery validation. Glad to post it here if u'd like

   $.ajax({
                        url: "/Mycheckingaction",
                        type: 'POST',
                        dataType: 'json',
                        data: { id: $('input[name="qty"]').val(); },
                        success: function (response, textStatus, xhr) {
                                 if(!response)
                                 {
                                     alert('Error,not equal');     
                                 }
         });