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javascript – How to properly implement a custom ajax

Posted by: admin April 23, 2020 Leave a comment

Questions:

In order to keep the logotext <div class="small-7 medium-4 columns logo"> and the menu <nav class="pagedMenu" role="navigation">,without clipping on page refresh or while the content is loading from a page to another, I am trying to implement this solution made by @Buzinas (special thanks). In a few more words:

In header.php we have this script:

<head>
    ...

    <script>
    function ajax(url, callback, method, params) {
      if (!method) method = 'GET';

      var xhr = new XMLHttpRequest();
      xhr.open(method, url);

      if (callback) xhr.addEventListener('load', function() {
        callback.call(this, xhr);
      });

      if (params) {
        params = Object.keys(params).map(function(key) {
          return encodeURIComponent(key) + '=' + encodeURIComponent(params[key]);
        }).join('&');
        xhr.send(params);
      } else {
        xhr.send();
      }
    }

    // CUSTOM AJAX CONTENT LOADING FUNCTION
    function ajaxRevslider(obj) {

        // obj.type : Post Type
        // obj.id : ID of Content to Load
        // obj.aspectratio : The Aspect Ratio of the Container / Media
        // obj.selector : The Container Selector where the Content of Ajax will be injected. It is done via the Essential Grid on Return of Content

        var content = "";

        data = {};

        data.action = 'revslider_ajax_call_front';
        data.client_action = 'get_slider_html';
        data.token = '<?php echo wp_create_nonce("RevSlider_Front"); ?>';
        data.type = obj.type;
        data.id = obj.id;
        data.aspectratio = obj.aspectratio;

        // SYNC AJAX REQUEST
        jQuery.ajax({
            type:"post",
            url:"<?php echo admin_url('admin-ajax.php'); ?>",
            dataType: 'json',
            data:data,
            async:false,
            success: function(ret, textStatus, XMLHttpRequest) {
                if(ret.success == true)
                    content = ret.data;                             
            },
            error: function(e) {
                console.log(e);
            }
        });

         // FIRST RETURN THE CONTENT WHEN IT IS LOADED !!
         return content;                         
    };

    // CUSTOM AJAX FUNCTION TO REMOVE THE SLIDER
    function ajaxRemoveRevslider(obj) {
        return jQuery(obj.selector+" .rev_slider").revkill();
    }

    document.addEventListener('DOMContentLoaded', function() {
      var main = document.querySelector('div[role=main]'),
        spinner = document.querySelector('div.sk-spinner'),
        pages = {};

      window.addEventListener('load', function() {
          toggleSpinner(false);
      });

      function toggleSpinner(b) {       
        spinner.classList[b ? 'remove' : 'add']('hidden');
        document.getElementById('wrapper').style.opacity = b ? 0 : 1;
      }

      function changePage(url, title) {
        setTimeout(function() {
          window.SITE.init();
          window.vc_js();
        }, 0);

        history.pushState({
          html: main.innerHTML,
          title: title
        }, '', url);

        toggleSpinner(false);
      }

      document.getElementById('menu-menu-2').addEventListener('click', function(e) {
        var el = e.target;

        if (el.tagName === 'A') {
          e.preventDefault();
          toggleSpinner(true);

          if (pages[el.href]) {
            main.innerHTML = '';
            main.appendChild(pages[el.href]);
            changePage(el.href);
          }
          else {
            ajax(el.href, function(xhr) {
              var frag = document.createRange().createContextualFragment(xhr.responseText);
              main.innerHTML = '<div>' + frag.querySelector('div[role=main]').innerHTML + '</div>';
              //pages[el.href] = main.firstElementChild;

              var _currentScripts = [].slice.call(document.querySelectorAll('script'));

              [].forEach.call(frag.querySelectorAll('script'), function(el, i) {
                if ((el.src === '' && el.parentNode)
                    || el.src.indexOf('slider') >= 0
                    || el.src.indexOf('Scroll') >= 0
                    || el.src.indexOf('vendor') >= 0
                    || el.src.indexOf('composer') >= 0
                   ) {
                  var s = _currentScripts.filter(function(x) {
                    return x.src === el.src;
                  });

                  while (s.length) {
                    if (s[0].parentNode)
                      s[0].parentNode.removeChild(s[0]);
                    s.shift();
                  }

                  document.body.appendChild(el);
                }
              });

              [].forEach.call(frag.querySelectorAll('style'), function(el, i) {
                document.querySelector('head').appendChild(el);
              });

              changePage(el.href, frag.querySelector('title').textContent);
            });
          }
        }
      });

      window.addEventListener('popstate', function(e) {
        if (e.state) {
          main.innerHTML = e.state.html;
          document.title = e.state.title;
        }
      });
    });
    </script>

    ...
</head>

The following jquery-ready.js is registered/enqueued in script-calls.php:

(function($){
var readyList = [];

// Store a reference to the original ready method.
var originalReadyMethod = jQuery.fn.ready;

// Override jQuery.fn.ready
jQuery.fn.ready = function(){
    var args = [].slice.call(arguments);

    if(args.length && args.length > 0 && typeof args[0] === 'function') {
      readyList.push(args[0]);
    }

    // Execute the original method.
    originalReadyMethod.apply( this, args );
};

// Used to trigger all ready events
$.triggerReady = function() {
  $(readyList).each(function(i, el) {
      try {
          el.apply(el);
      } catch(e) {
          console.log(e);
      }
  });
};
})(jQuery);

Also, in page.php I replaced get_header() and get_footer() functions as follows:

<?php
if(!isset($_REQUEST['ajax'])){
    get_header(); 
}
?>
<?php 
    if (is_page()) {
        $id = $wp_query->get_queried_object_id();
        $sidebar = get_post_meta($id, 'sidebar_set', true);
        $sidebar_pos = get_post_meta($id, 'sidebar_position', true);
    }
?>
...

<?php
if(!isset($_REQUEST['ajax'])){
    get_footer();
}
?>

There are still some issues trying to load a page with Revolution slider or Visual Composer Parallax content, like we have on Parallax or About us pages for example.

You can use this link and navigate to the above mentioned pages; Tests are made only in Chrome 45.0.2454.101 m 64-bit/ Win7, not yet prepared for IE, Firefox, mobile etc .

About the behaviour:
Rev slider parallax content, will become scrambled from the second link visit (Home or Parallax pages); The Visual Composer parallax content (the guy at the desk picture, About us page for example) is fixed on the first link visit – after F5 will be fine;

The menu mynewmenu.js will remember the state on session, so u’ll have to close the browser in oder to visit multiple direct links properly.

I’ve received an answer from Rev slider support team telling me:

The best option for Ajax is to just add the slider’s shortcode to a regular page/post, and then the slider’s “init” script is will automatically be included with the slider’s HTML. Then when the slider’s HTML is removed from the DOM, all jQuery events are also removed. So all you really need to do is pull in the slider as page/post content, and then you won’t need any custom script for the slider specifically.

Unfortunately I have no idea how can I approach this, implementing the above sugestion into my already received solution.

Could be something related to API(?) I’ve found these infos on Revolution slider / Visual Composer pages. Any thoughts?

How to&Answers:

You should probably read:

You should pass PHP variables to your javascript files using wp_localize_script.

Even if you don’t do it that way, you shouldn’t need to hack the main page templates just to serve specific content — create a one-off page, then make a specific template for it. Then you can use that page’s URL as your ajax endpoint.

But if what you really need to do is run Rev Slider’s shortcode (and the Parallax thing if it has one too) somewhere other than a page:

Answer:

Do you need help with this still? I think the revolution slider’s support team nailed it with the statements

just add the slider’s shortcode to a regular page/post

and

all you really need to do is pull in the slider as page/post content

So, use the slider on your WordPress page/post through the shortcode, [shortcode]. Then reference the $_GET[] and/or $_POST[] array elements in php (or javascript, however you’re doing it) as needed.