Merge pull request #916 from dalf/pref_infinite_scroll2

Convert the infinite_scroll plugin as a preference (second version)

3 files changed, 130 insertions, 35 deletions

diff --git a/searx/static/themes/oscar/js/searxng.js b/searx/static/themes/oscar/js/searxng.js
index 45272607f..edeeaee84 100644
--- a/searx/static/themes/oscar/js/searxng.js
+++ b/searx/static/themes/oscar/js/searxng.js
@@ -19,6 +19,7 @@ window.searxng = (function(d) {
 
     return {
         autocompleter: script.getAttribute('data-autocompleter') === 'true',
+        infinite_scroll: script.getAttribute('data-infinite-scroll') === 'true',
         method: script.getAttribute('data-method'),
         translations: JSON.parse(script.getAttribute('data-translations'))
     };
@@ -189,6 +190,56 @@ $(document).ready(function(){
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
 
+$(document).ready(function() {
+    function hasScrollbar() {
+        var root = document.compatMode=='BackCompat'? document.body : document.documentElement;
+        return root.scrollHeight>root.clientHeight;
+    }
+
+    function loadNextPage() {
+        var formData = $('#pagination form:last').serialize();
+        if (formData) {
+            $('#pagination').html('<div class="loading-spinner"></div>');
+            $.ajax({
+                type: "POST",
+                url: $('#search_form').prop('action'),
+                data: formData,
+                dataType: 'html',
+                success: function(data) {
+                    var body = $(data);
+                    $('#pagination').remove();
+                    $('#main_results').append('<hr/>');
+                    $('#main_results').append(body.find('.result'));
+                    $('#main_results').append(body.find('#pagination'));
+                    if(!hasScrollbar()) {
+                        loadNextPage();
+                    }
+                }
+            });
+        }
+    }
+
+    if (searxng.infinite_scroll) {
+        var win = $(window);
+        $("html").addClass('infinite_scroll');
+        if(!hasScrollbar()) {
+            loadNextPage();
+        }
+        win.on('scroll', function() {
+            if ($(document).height() - win.height() - win.scrollTop() < 150) {
+                loadNextPage();
+            }
+        });
+    }
+
+});
+;/**
+ * @license
+ * (C) Copyright Contributors to the SearXNG project.
+ * (C) Copyright Contributors to the searx project (2014 - 2021).
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
 window.addEventListener('load', function() {
     // Hide infobox toggle if shrunk size already fits all content.
     $('.infobox').each(function() {
@@ -348,7 +399,8 @@ $(document).ready(function(){
     this.verticalMargin = verticalMargin;
     this.horizontalMargin = horizontalMargin;
     this.maxHeight = maxHeight;
-    this.isAlignDone = true;
+    this.trottleCallToAlign = null;
+    this.alignAfterThrotteling = false;
   }
 
   /**
@@ -391,12 +443,12 @@ $(document).ready(function(){
         // not loaded image : make it square as _getHeigth said it
         imgWidth = height;
       }
-      img.style.width = imgWidth + 'px';
-      img.style.height = height + 'px';
-      img.style.marginLeft = this.horizontalMargin + 'px';
-      img.style.marginTop = this.horizontalMargin + 'px';
-      img.style.marginRight = this.verticalMargin - 7 + 'px'; // -4 is the negative margin of the inline element
-      img.style.marginBottom = this.verticalMargin - 7 + 'px';
+      img.setAttribute('width', Math.round(imgWidth));
+      img.setAttribute('height', Math.round(height));
+      img.style.marginLeft = Math.round(this.horizontalMargin) + 'px';
+      img.style.marginTop = Math.round(this.horizontalMargin) + 'px';
+      img.style.marginRight = Math.round(this.verticalMargin - 7) + 'px'; // -4 is the negative margin of the inline element
+      img.style.marginBottom = Math.round(this.verticalMargin - 7) + 'px';
       resultNode = img.parentNode.parentNode;
       if (!resultNode.classList.contains('js')) {
         resultNode.classList.add('js');
@@ -431,6 +483,23 @@ $(document).ready(function(){
     }
   };
 
+  ImageLayout.prototype.throttleAlign = function () {
+    var obj = this;
+    if (obj.trottleCallToAlign) {
+      obj.alignAfterThrotteling = true;
+    } else {
+      obj.alignAfterThrotteling = false;
+      obj.align();
+      obj.trottleCallToAlign = setTimeout(function () {
+        if (obj.alignAfterThrotteling) {
+          obj.align();
+        }
+        obj.alignAfterThrotteling = false;
+        obj.trottleCallToAlign = null;
+      }, 20);
+    }
+  }
+
   ImageLayout.prototype.align = function () {
     var i;
     var results_selectorNode = d.querySelectorAll(this.results_selector);
@@ -460,9 +529,9 @@ $(document).ready(function(){
     }
   };
 
-  ImageLayout.prototype.watch = function () {
+  ImageLayout.prototype._monitorImages = function () {
     var i, img;
-    var obj = this;
+    var objthrottleAlign = this.throttleAlign.bind(this);
     var results_nodes = d.querySelectorAll(this.results_selector);
     var results_length = results_nodes.length;
 
@@ -471,34 +540,53 @@ $(document).ready(function(){
       event.originalTarget.src = w.searxng.static_path + w.searxng.theme.img_load_error;
     }
 
-    function throttleAlign () {
-      if (obj.isAlignDone) {
-        obj.isAlignDone = false;
-        setTimeout(function () {
-          obj.align();
-          obj.isAlignDone = true;
-        }, 100);
+    for (i = 0; i < results_length; i++) {
+      img = results_nodes[i].querySelector(this.img_selector);
+      if (img !== null && img !== undefined && !img.classList.contains('aligned')) {
+        img.addEventListener('load', objthrottleAlign);
+        // https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onerror
+        img.addEventListener('error', objthrottleAlign);
+        img.addEventListener('timeout', objthrottleAlign);
+        if (w.searxng.theme.img_load_error) {
+          img.addEventListener('error', img_load_error, {once: true});
+        }
+        img.classList.add('aligned');
       }
     }
+  }
+
+  ImageLayout.prototype.watch = function () {
+    var objthrottleAlign = this.throttleAlign.bind(this);
 
     // https://developer.mozilla.org/en-US/docs/Web/API/Window/pageshow_event
-    w.addEventListener('pageshow', throttleAlign);
+    w.addEventListener('pageshow', objthrottleAlign);
     // https://developer.mozilla.org/en-US/docs/Web/API/FileReader/load_event
-    w.addEventListener('load', throttleAlign);
+    w.addEventListener('load', objthrottleAlign);
     // https://developer.mozilla.org/en-US/docs/Web/API/Window/resize_event
-    w.addEventListener('resize', throttleAlign);
+    w.addEventListener('resize', objthrottleAlign);
 
-    for (i = 0; i < results_length; i++) {
-      img = results_nodes[i].querySelector(this.img_selector);
-      if (img !== null && img !== undefined) {
-        img.addEventListener('load', throttleAlign);
-        // https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onerror
-        img.addEventListener('error', throttleAlign);
-        if (w.searxng.theme.img_load_error) {
-          img.addEventListener('error', img_load_error, {once: true});
+    this._monitorImages();
+
+    var obj = this;
+
+    let observer = new MutationObserver(entries => {
+      let newElement = false;
+      for (let i = 0; i < entries.length; i++) {
+        if (entries[i].addedNodes.length > 0 && entries[i].addedNodes[0].classList.contains('result')) {
+          newElement = true;
+          break;
         }
       }
-    }
+      if (newElement) {
+        obj._monitorImages();
+      }
+    });
+    observer.observe(d.querySelector(this.container_selector), {
+      childList: true,
+      subtree: true,
+      attributes: false,
+      characterData: false,
+    })
   };
 
   w.searxng.ImageLayout = ImageLayout;
diff --git a/searx/static/themes/oscar/js/searxng.min.js b/searx/static/themes/oscar/js/searxng.min.js
index ab237e17c..e0573b888 100644
--- a/searx/static/themes/oscar/js/searxng.min.js
+++ b/searx/static/themes/oscar/js/searxng.min.js
@@ -4,7 +4,7 @@
  * (C) Copyright Contributors to the searx project (2014 - 2021).
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
-window.searxng=function(t){"use strict";t.getElementsByTagName("html")[0].className="js";t=t.currentScript||(t=t.getElementsByTagName("script"))[t.length-1];return{autocompleter:"true"===t.getAttribute("data-autocompleter"),method:t.getAttribute("data-method"),translations:JSON.parse(t.getAttribute("data-translations"))}}(document),
+window.searxng=function(t){"use strict";t.getElementsByTagName("html")[0].className="js";t=t.currentScript||(t=t.getElementsByTagName("script"))[t.length-1];return{autocompleter:"true"===t.getAttribute("data-autocompleter"),infinite_scroll:"true"===t.getAttribute("data-infinite-scroll"),method:t.getAttribute("data-method"),translations:JSON.parse(t.getAttribute("data-translations"))}}(document),
 /**
  * @license
  * (C) Copyright Contributors to the SearXNG project.
@@ -12,7 +12,7 @@ window.searxng=function(t){"use strict";t.getElementsByTagName("html")[0].classN
  * (C) 2014 by Thomas Pointhuber, <thomas.pointhuber@gmx.at>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
-$(document).ready(function(){var t,a="";searxng.autocompleter&&((t=new Bloodhound({datumTokenizer:Bloodhound.tokenizers.obj.whitespace("value"),queryTokenizer:Bloodhound.tokenizers.whitespace,remote:{url:"./autocompleter?q=%QUERY",wildcard:"%QUERY"}})).initialize(),$("#q").on("keydown",function(t){13==t.which&&(a=$("#q").val())}),$("#q").typeahead({name:"search-results",highlight:!1,hint:!0,displayKey:function(t){return t},classNames:{input:"tt-input",hint:"tt-hint",menu:"tt-dropdown-menu",dataset:"tt-dataset-search-results"}},{name:"autocomplete",source:t}),$("#q").bind("typeahead:select",function(t,e){a&&$("#q").val(a),$("#search_form").submit()}))}),
+$(document).ready(function(){var t,n="";searxng.autocompleter&&((t=new Bloodhound({datumTokenizer:Bloodhound.tokenizers.obj.whitespace("value"),queryTokenizer:Bloodhound.tokenizers.whitespace,remote:{url:"./autocompleter?q=%QUERY",wildcard:"%QUERY"}})).initialize(),$("#q").on("keydown",function(t){13==t.which&&(n=$("#q").val())}),$("#q").typeahead({name:"search-results",highlight:!1,hint:!0,displayKey:function(t){return t},classNames:{input:"tt-input",hint:"tt-hint",menu:"tt-dropdown-menu",dataset:"tt-dataset-search-results"}},{name:"autocomplete",source:t}),$("#q").bind("typeahead:select",function(t,e){n&&$("#q").val(n),$("#search_form").submit()}))}),
 /**
  * @license
  * (C) Copyright Contributors to the SearXNG project.
@@ -20,7 +20,14 @@ $(document).ready(function(){var t,a="";searxng.autocompleter&&((t=new Bloodhoun
  * (C) 2014 by Thomas Pointhuber, <thomas.pointhuber@gmx.at>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
-$(document).ready(function(){$("#q.autofocus").focus(),$("#clear_search").click(function(){document.getElementById("q").value=""}),$(".select-all-on-click").click(function(){$(this).select()}),$(".btn-collapse").click(function(){var t=$(this).data("btn-text-collapsed"),e=$(this).data("btn-text-not-collapsed");""!==t&&""!==e&&(new_html=$(this).hasClass("collapsed")?$(this).html().replace(t,e):$(this).html().replace(e,t),$(this).html(new_html))}),$(".btn-toggle .btn").click(function(){var t="btn-"+$(this).data("btn-class"),e=$(this).data("btn-label-default"),a=$(this).data("btn-label-toggled");""!==a&&(new_html=$(this).hasClass("btn-default")?$(this).html().replace(e,a):$(this).html().replace(a,e),$(this).html(new_html)),$(this).toggleClass(t),$(this).toggleClass("btn-default")}),$(".media-loader").click(function(){var t=$(this).data("target"),t=$(t+" > iframe"),e=t.attr("src");void 0!==e&&!1!==e||t.attr("src",t.data("src"))}),$(".btn-sm").dblclick(function(){var t="btn-"+$(this).data("btn-class");$(this).hasClass("btn-default")?($(".btn-sm > input").attr("checked","checked"),$(".btn-sm > input").prop("checked",!0),$(".btn-sm").addClass(t),$(".btn-sm").addClass("active"),$(".btn-sm").removeClass("btn-default")):($(".btn-sm > input").attr("checked",""),$(".btn-sm > input").removeAttr("checked"),$(".btn-sm > input").checked=!1,$(".btn-sm").removeClass(t),$(".btn-sm").removeClass("active"),$(".btn-sm").addClass("btn-default"))}),$(".nav-tabs").click(function(t){$(t.target).parents("ul").children().attr("aria-selected","false"),$(t.target).parent().attr("aria-selected","true")}),searxng.image_thumbnail_layout=new searxng.ImageLayout("#main_results","#main_results .result-images","img.img-thumbnail",15,3,200),searxng.image_thumbnail_layout.watch()}),
+$(document).ready(function(){$("#q.autofocus").focus(),$("#clear_search").click(function(){document.getElementById("q").value=""}),$(".select-all-on-click").click(function(){$(this).select()}),$(".btn-collapse").click(function(){var t=$(this).data("btn-text-collapsed"),e=$(this).data("btn-text-not-collapsed");""!==t&&""!==e&&(new_html=$(this).hasClass("collapsed")?$(this).html().replace(t,e):$(this).html().replace(e,t),$(this).html(new_html))}),$(".btn-toggle .btn").click(function(){var t="btn-"+$(this).data("btn-class"),e=$(this).data("btn-label-default"),n=$(this).data("btn-label-toggled");""!==n&&(new_html=$(this).hasClass("btn-default")?$(this).html().replace(e,n):$(this).html().replace(n,e),$(this).html(new_html)),$(this).toggleClass(t),$(this).toggleClass("btn-default")}),$(".media-loader").click(function(){var t=$(this).data("target"),t=$(t+" > iframe"),e=t.attr("src");void 0!==e&&!1!==e||t.attr("src",t.data("src"))}),$(".btn-sm").dblclick(function(){var t="btn-"+$(this).data("btn-class");$(this).hasClass("btn-default")?($(".btn-sm > input").attr("checked","checked"),$(".btn-sm > input").prop("checked",!0),$(".btn-sm").addClass(t),$(".btn-sm").addClass("active"),$(".btn-sm").removeClass("btn-default")):($(".btn-sm > input").attr("checked",""),$(".btn-sm > input").removeAttr("checked"),$(".btn-sm > input").checked=!1,$(".btn-sm").removeClass(t),$(".btn-sm").removeClass("active"),$(".btn-sm").addClass("btn-default"))}),$(".nav-tabs").click(function(t){$(t.target).parents("ul").children().attr("aria-selected","false"),$(t.target).parent().attr("aria-selected","true")}),searxng.image_thumbnail_layout=new searxng.ImageLayout("#main_results","#main_results .result-images","img.img-thumbnail",15,3,200),searxng.image_thumbnail_layout.watch()}),
+/**
+ * @license
+ * (C) Copyright Contributors to the SearXNG project.
+ * (C) Copyright Contributors to the searx project (2014 - 2021).
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+$(document).ready(function(){function e(){var t="BackCompat"==document.compatMode?document.body:document.documentElement;return t.scrollHeight>t.clientHeight}function n(){var t=$("#pagination form:last").serialize();t&&($("#pagination").html('<div class="loading-spinner"></div>'),$.ajax({type:"POST",url:$("#search_form").prop("action"),data:t,dataType:"html",success:function(t){t=$(t);$("#pagination").remove(),$("#main_results").append("<hr/>"),$("#main_results").append(t.find(".result")),$("#main_results").append(t.find("#pagination")),e()||n()}}))}var t;searxng.infinite_scroll&&(t=$(window),$("html").addClass("infinite_scroll"),e()||n(),t.on("scroll",function(){$(document).height()-t.height()-t.scrollTop()<150&&n()}))}),
 /**
  * @license
  * (C) Copyright Contributors to the SearXNG project.
@@ -35,14 +42,14 @@ window.addEventListener("load",function(){$(".infobox").each(function(){var t=$(
  * (C) 2014 by Thomas Pointhuber, <thomas.pointhuber@gmx.at>
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
-$(document).ready(function(){$(".searxng_init_map").on("click",function(t){var e=$(this).data("leaflet-target"),a=$(this).data("map-lon"),n=$(this).data("map-lat"),i=$(this).data("map-zoom"),s=$(this).data("map-boundingbox"),o=$(this).data("map-geojson"),r=(s&&(southWest=L.latLng(s[0],s[2]),northEast=L.latLng(s[1],s[3]),map_bounds=L.latLngBounds(southWest,northEast)),L.Icon.Default.imagePath="./static/themes/oscar/css/images/",L.map(e)),s=new L.TileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",{minZoom:1,maxZoom:19,attribution:'Map data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'}),e=(new L.TileLayer("https://maps.wikimedia.org/osm-intl/{z}/{x}/{y}.png",{minZoom:1,maxZoom:19,attribution:'Wikimedia maps beta | Maps data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'}),setTimeout(function(){map_bounds?r.fitBounds(map_bounds,{maxZoom:17}):a&&n&&(i?r.setView(new L.LatLng(n,a),i):r.setView(new L.LatLng(n,a),8))},0),r.addLayer(s),{"OSM Mapnik":s});L.control.layers(e).addTo(r),o&&L.geoJson(o).addTo(r),$(this).off(t)})}),
+$(document).ready(function(){$(".searxng_init_map").on("click",function(t){var e=$(this).data("leaflet-target"),n=$(this).data("map-lon"),a=$(this).data("map-lat"),i=$(this).data("map-zoom"),o=$(this).data("map-boundingbox"),s=$(this).data("map-geojson"),r=(o&&(southWest=L.latLng(o[0],o[2]),northEast=L.latLng(o[1],o[3]),map_bounds=L.latLngBounds(southWest,northEast)),L.Icon.Default.imagePath="./static/themes/oscar/css/images/",L.map(e)),o=new L.TileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",{minZoom:1,maxZoom:19,attribution:'Map data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'}),e=(new L.TileLayer("https://maps.wikimedia.org/osm-intl/{z}/{x}/{y}.png",{minZoom:1,maxZoom:19,attribution:'Wikimedia maps beta | Maps data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors'}),setTimeout(function(){map_bounds?r.fitBounds(map_bounds,{maxZoom:17}):n&&a&&(i?r.setView(new L.LatLng(a,n),i):r.setView(new L.LatLng(a,n),8))},0),r.addLayer(o),{"OSM Mapnik":o});L.control.layers(e).addTo(r),s&&L.geoJson(s).addTo(r),$(this).off(t)})}),
 /**
  * @license
  * (C) Copyright Contributors to the SearXNG project.
  * (C) Copyright Contributors to the searx project (2014 - 2021).
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
-$(document).ready(function(){let s=null;document.querySelector('body[class="preferences_endpoint"]')&&$("[data-engine-name]").hover(function(){null==s&&$.ajax("engine_descriptions.json",dataType="json").done(function(t){s=t;for(var[e,a]of Object.entries(t))for(const i of $('[data-engine-name="'+e+'"] .description')){var n=" (<i>"+searxng.translations.Source+":&nbsp;"+a[1]+"</i>)";i.innerHTML=a[0]+n}})})}),
+$(document).ready(function(){let o=null;document.querySelector('body[class="preferences_endpoint"]')&&$("[data-engine-name]").hover(function(){null==o&&$.ajax("engine_descriptions.json",dataType="json").done(function(t){o=t;for(var[e,n]of Object.entries(t))for(const i of $('[data-engine-name="'+e+'"] .description')){var a=" (<i>"+searxng.translations.Source+":&nbsp;"+n[1]+"</i>)";i.innerHTML=n[0]+a}})})}),
 /**
  * @license
  * (C) Copyright Contributors to the SearXNG project.
@@ -71,5 +78,5 @@ $(document).ready(function(){$("#allow-all-engines").click(function(){$(".onoffs
 * );
 * searxng.image_thumbnail_layout.watch();
 */
-function(r,c){function t(t,e,a,n,i,s){this.container_selector=t,this.results_selector=e,this.img_selector=a,this.verticalMargin=n,this.horizontalMargin=i,this.maxHeight=s,this.isAlignDone=!0}t.prototype._getHeigth=function(t,e){for(var a,n=0,i=0;i<t.length;i++)0<(a=t[i]).naturalWidth&&0<a.naturalHeight?n+=a.naturalWidth/a.naturalHeight:n+=1;return(e-t.length*this.verticalMargin)/n},t.prototype._setSize=function(t,e){for(var a,n,i=t.length,s=0;s<i;s++)n=0<(a=t[s]).naturalWidth&&0<a.naturalHeight?e*a.naturalWidth/a.naturalHeight:e,a.style.width=n+"px",a.style.height=e+"px",a.style.marginLeft=this.horizontalMargin+"px",a.style.marginTop=this.horizontalMargin+"px",a.style.marginRight=this.verticalMargin-7+"px",a.style.marginBottom=this.verticalMargin-7+"px",(n=a.parentNode.parentNode).classList.contains("js")||n.classList.add("js")},t.prototype._alignImgs=function(t){for(var e,a,n,i,s=c.querySelector(this.container_selector),o=window.getComputedStyle(s),r=parseInt(o.getPropertyValue("padding-left"),10),o=parseInt(o.getPropertyValue("padding-right"),10),l=s.clientWidth-r-o;0<t.length;){for(e=!0,n=1;n<=t.length&&e;n++)a=t.slice(0,n),(i=this._getHeigth(a,l))<this.maxHeight&&(this._setSize(a,i),t=t.slice(n),e=!1);if(e){this._setSize(a,Math.min(this.maxHeight,i));break}}},t.prototype.align=function(){for(var t=c.querySelectorAll(this.results_selector),e=t.length,a=null,n=null,i=[],s=0;s<e;s++)(n=t[s]).previousElementSibling!==a&&0<i.length&&(this._alignImgs(i),i=[]),i.push(n.querySelector(this.img_selector)),a=n;0<i.length&&this._alignImgs(i)},t.prototype.watch=function(){var t,e,a=this,n=c.querySelectorAll(this.results_selector),i=n.length;function s(t){t.originalTarget.src=r.searxng.static_path+r.searxng.theme.img_load_error}function o(){a.isAlignDone&&(a.isAlignDone=!1,setTimeout(function(){a.align(),a.isAlignDone=!0},100))}for(r.addEventListener("pageshow",o),r.addEventListener("load",o),r.addEventListener("resize",o),t=0;t<i;t++)null!=(e=n[t].querySelector(this.img_selector))&&(e.addEventListener("load",o),e.addEventListener("error",o),r.searxng.theme.img_load_error&&e.addEventListener("error",s,{once:!0}))},r.searxng.ImageLayout=t}(window,document);
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diff --git a/searx/static/themes/oscar/js/searxng.min.js.map b/searx/static/themes/oscar/js/searxng.min.js.map
index c59651586..6156eea02 100644
--- a/searx/static/themes/oscar/js/searxng.min.js.map
+++ b/searx/static/themes/oscar/js/searxng.min.js.map
@@ -1 +1 @@
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