How to send file to php via jQuery?

问题

I try send a file via jQuery to a PHP file for processing.

<form action="help-uploader.php" method="POST" class="signup" id="upform" enctype="multipart/form-data">

   <input type="text" id="title" name="title" tabindex="1" value="">
   <input id="file" type='file'" />
   <button class="submitbtn" id="submit">submit</button>
</form>

and jQuery:

$(document).ready(function(){
        $('#submit').click(function (e) {
        // custom handling here
            e.preventDefault();
            var ititle = $("#title").val();
            var ifile = $("#file").val();

            $.post("help-uploader.php",
                {
                    title: ititle,
                    file: ifile
                },function(data, status){alert("Data: " + data + "\nStatus: " + status);});
        });
    });

and **help-uploader.php**

<?php
echo $_POST['file'];
echo basename($_FILES["file"]["name"]);
?>

First ECHO prints path of file in client.

Second ECHO not prints anything.

How can I send a file to PHP via jQuery correctly?

回答1:

You need to use formdata . I am providing a example function which takes arguments ,i.e form refrence and functions callback to do stuff.This function binds event on your form submit. Try below-

function sendAjaxForm(frm,callbackbefore,callbackdone)
    {
        var form = frm;
        form.submit(function(event){
            event.preventDefault();
            var formData = new FormData(this);
            var ajaxReq=$.ajax({
                url: $(this).attr('action'),
                type: $(this).attr('method'),
                data: formData,
                async: false,
                cache: false,
                contentType: false,
                processData: false,
                beforeSend: callbackbefore
                });
            ajaxReq.done(callbackdone);
        }); // submit done
    }

Now call that function as in your example

sendAjaxForm($('#upform'),function(){alert('sending');},function(data){alert("Data: " + data);})

回答2:

You need to take advantage of FormData() with use of xmlhttprequest. $.post() should not be used while performing a file upload with ajax because it doesn't use xmlhttprequest instead you should use $.ajax() or native js xmlhttprequest.

As you are using jQuery then you can do this with form submit instead:

$(document).ready(function(){
    $('#upform').submit(function(e){
      e.preventDefault();
      var fd = new FormData(document.querySelector(this));
      $.ajax({
         url: "help-uploader.php",
         type: "POST",
         data: fd,
         cache:false, // do not cache 
         processData: false,  // required
         contentType: false   // required
         success:function(data){
           console.log(data);
         },
         error:function(err){
           console.log(err);
         }
     });
   });
});

来源：https://stackoverflow.com/questions/32817326/how-to-send-file-to-php-via-jquery

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