JQuery set cookie for first visit

cookiesjquery

I got a script like that (I use jQuery cookie js to set cookies) to display layer on first visit.

<script type="text/javascript">
    $(document).ready(function() {
        var visited = $.cookie('visited', 'yes', { expires: 1, path: '/' });

        if (visited == null) {
            $('.newsletter_layer').show();
            $.cookie('visited', 'yes'); 
            alert($.cookie("visited"));         
        }
    });
</script>

Unfortunatelly something is not working. I think something is wrong with the if statement. Anyone have idea what can be wrong?

Best Answer

Because you are creating the cookie, it will never be null. You need to change your logic to first check if the cookie exists. If not, show the .newsletter_layer element, then set the cookie value:

<script type="text/javascript">
    $(document).ready(function() {
        // check cookie
        var visited = $.cookie("visited")

        if (visited == null) {
            $('.newsletter_layer').show();
            alert($.cookie("visited"));         
        }

        // set cookie
        $.cookie('visited', 'yes', { expires: 1, path: '/' });
    });
</script>

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if ($(selector).length)

You don't need that >0 part.

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With HTML5 you can make file uploads with Ajax and jQuery. Not only that, you can do file validations (name, size, and MIME type) or handle the progress event with the HTML5 progress tag (or a div). Recently I had to make a file uploader, but I didn't want to use Flash nor Iframes or plugins and after some research I came up with the solution.

The HTML:

<form enctype="multipart/form-data">
    <input name="file" type="file" />
    <input type="button" value="Upload" />
</form>
<progress></progress>

First, you can do some validation if you want. For example, in the .on('change') event of the file:

$(':file').on('change', function () {
  var file = this.files[0];

  if (file.size > 1024) {
    alert('max upload size is 1k');
  }

  // Also see .name, .type
});

Now the $.ajax() submit with the button's click:

$(':button').on('click', function () {
  $.ajax({
    // Your server script to process the upload
    url: 'upload.php',
    type: 'POST',

    // Form data
    data: new FormData($('form')[0]),

    // Tell jQuery not to process data or worry about content-type
    // You *must* include these options!
    cache: false,
    contentType: false,
    processData: false,

    // Custom XMLHttpRequest
    xhr: function () {
      var myXhr = $.ajaxSettings.xhr();
      if (myXhr.upload) {
        // For handling the progress of the upload
        myXhr.upload.addEventListener('progress', function (e) {
          if (e.lengthComputable) {
            $('progress').attr({
              value: e.loaded,
              max: e.total,
            });
          }
        }, false);
      }
      return myXhr;
    }
  });
});

As you can see, with HTML5 (and some research) file uploading not only becomes possible but super easy. Try it with Google Chrome as some of the HTML5 components of the examples aren't available in every browser.

Best Answer

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