Item15189: Redirectto parameter breaks preview function

If the edit url includes a redirectto parameter, clicking the "Preview" button in topic action bar does not work as expected (no pop-up with preview). No other url parameter causes this issue.

In my effort to find a work-around, I was able to modify jquery.natedit.js as follows to simply disable the redirectto form element prior to triggering the preview url and then re-enabling after preview is rendered. Here's my modification (in red):

 /* preview handler */
  self.form.find(".ui-natedit-preview").on("click", function() {

    if (self.form.validate().form()) {
      self.beforeSubmit("preview");
      self.form.find("input[name=redirectto]").prop('disabled',true);
      self.form.ajaxSubmit({
        url: foswiki.getScriptUrl( 'rest', 'NatEditPlugin', 'save'),  // SMELL: use this one for REST as long as the normal save can't cope with REST
        beforeSubmit: function() {
          self.hideMessages();
          $.blockUI({
            message: '<h1> Loading preview ... </h1>'
          });
        },
        error: function(xhr, textStatus, errorThrown) {
          var message = self.extractErrorMessage(xhr.responseText || textStatus);
          $.unblockUI();
          self.showMessage("error", message);
        },
        success: function(data, textStatus) {
          var $window = $(window),
            height = Math.round(parseInt($window.height() * 0.6, 10)),
            width = Math.round(parseInt($window.width() * 0.6, 10));

          $.unblockUI();

          if (width < 640) {
            width = 640;
          }

          data = data.replace(/%width%/g, width).replace(/%height%/g, height);
          $("body").append(data);
        }
      });
      self.form.find("input[name=redirectto]").prop('disabled',false);
    }
    return false;
  });

-- LynnwoodBrown - 25 Apr 2023

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