ajax jquery doesn't send data to php code example

Example 1: how to send data using ajax in php

$.ajax({
	url: "/something", // the url we want to send and get data from
    type: "GET", // type of the data we send (POST/GET)
    data: {p1: "This is our data"}, // the data we want to send
    success: function(data){ // when successfully sent data and returned
    	// do something with the returned data
   		console.log(data);
    }
}).done(function(){
	// this part will run when we send and return successfully
    console.log("Success.");
}).fail(function(){
    // this part will run when an error occurres
    console.log("An error has occurred.");
}).always(function(){
    // this part will always run no matter what
  	console.log("Complete.");
});

Example 2: jquery send form data to php

<form id="foo">
    <label for="bar">A bar</label>
    <input id="bar" name="bar" type="text" value="" />

    <input type="submit" value="Send" />
</form>

// Variable to hold request
var request;

// Bind to the submit event of our form
$("#foo").submit(function(event){

    // Prevent default posting of form - put here to work in case of errors
    event.preventDefault();

    // Abort any pending request
    if (request) {
        request.abort();
    }
    // setup some local variables
    var $form = $(this);

    // Let's select and cache all the fields
    var $inputs = $form.find("input, select, button, textarea");

    // Serialize the data in the form
    var serializedData = $form.serialize();

    // Let's disable the inputs for the duration of the Ajax request.
    // Note: we disable elements AFTER the form data has been serialized.
    // Disabled form elements will not be serialized.
    $inputs.prop("disabled", true);

    // Fire off the request to /form.php
    request = $.ajax({
        url: "/form.php",
        type: "post",
        data: serializedData
    });

    // Callback handler that will be called on success
    request.done(function (response, textStatus, jqXHR){
        // Log a message to the console
        console.log("Hooray, it worked!");
    });

    // Callback handler that will be called on failure
    request.fail(function (jqXHR, textStatus, errorThrown){
        // Log the error to the console
        console.error(
            "The following error occurred: "+
            textStatus, errorThrown
        );
    });

    // Callback handler that will be called regardless
    // if the request failed or succeeded
    request.always(function () {
        // Reenable the inputs
        $inputs.prop("disabled", false);
    });

});