From 214ddb8c0f91c4ce15e74e91b140db5b16b5fa4d Mon Sep 17 00:00:00 2001
From: Jun Pataleta <jun@moodle.com>
Date: Fri, 18 Aug 2017 11:19:08 +0800
Subject: [PATCH] MDL-59836 core_amd: Use only one input event handler

* We have duplicate input event handlers for the autocomplete element
which are both firing when the input element's value is being set.
In case an AJAX handler is defined for the autocomplete suggestions,
this causes the autocomplete suggestions so show "No suggestions" first
and then load the results from the AJAX handler a little bit later.
---
 lib/amd/build/form-autocomplete.min.js |  2 +-
 lib/amd/src/form-autocomplete.js       | 68 +++++++++++++-------------
 2 files changed, 35 insertions(+), 35 deletions(-)

diff --git a/lib/amd/build/form-autocomplete.min.js b/lib/amd/build/form-autocomplete.min.js
index 42f2ccd072a..6075b36703d 100644
--- a/lib/amd/build/form-autocomplete.min.js
+++ b/lib/amd/build/form-autocomplete.min.js
@@ -1 +1 @@
-define(["jquery","core/log","core/str","core/templates","core/notification"],function(a,b,c,d,e){var f={DOWN:40,ENTER:13,SPACE:32,ESCAPE:27,COMMA:44,UP:38},g=function(b,c){var d=a(document.getElementById(c.selectionId)),e=d.children("[aria-selected=true]").length;for(b%=e;b<0;)b+=e;var f=a(d.children("[aria-selected=true]").get(b)),g=c.selectionId+"-"+b;d.children().attr("data-active-selection",!1).attr("id",""),f.attr("data-active-selection",!0).attr("id",g),d.attr("aria-activedescendant",g)},h=function(b,c,f){var h=[],i=a(document.getElementById(c.selectionId)),j=i.attr("aria-activedescendant"),k=!1;j&&(k=a(document.getElementById(j)).attr("data-value")),f.children("option").each(function(b,c){a(c).prop("selected")&&h.push({label:a(c).html(),value:a(c).attr("value")})});var l=a.extend({items:h},b,c);d.render("core/form_autocomplete_selection",l).done(function(b){i.empty().append(a(b).html()),k!==!1&&i.children("[aria-selected=true]").each(function(b,d){a(d).attr("data-value")===k&&g(b,c)})}).fail(e.exception)},i=function(a){"undefined"!=typeof M.core_formchangechecker&&M.core_formchangechecker.set_form_changed(),a.change()},j=function(b,c,d,e){var f=a(d).attr("data-value");b.multiple&&e.children("option").each(function(b,c){a(c).attr("value")==f&&(a(c).prop("selected",!1),a(c).attr("data-iscustom")&&a(c).remove())}),h(b,c,e),i(e)},k=function(b,c){var d=a(document.getElementById(c.inputId)),e=a(document.getElementById(c.suggestionsId)),f=e.children("[aria-hidden=false]").length;for(b%=f;b<0;)b+=f;var g=a(e.children("[aria-hidden=false]").get(b)),h=a(e.children("[role=option]")).index(g),i=c.suggestionsId+"-"+h;e.children().attr("aria-selected",!1).attr("id",""),g.attr("aria-selected",!0).attr("id",i),d.attr("aria-activedescendant",i);var j=g.offset().top-e.offset().top+e.scrollTop()-e.height()/2;e.animate({scrollTop:j},100)},l=function(b){var c=a(document.getElementById(b.suggestionsId)),d=c.children("[aria-selected=true]"),e=c.children("[aria-hidden=false]").index(d);k(e+1,b)},m=function(b){var c=a(document.getElementById(b.selectionId)),d=c.children("[data-active-selection=true]");if(!d)return void g(0,b);var e=c.children("[aria-selected=true]").index(d);g(e-1,b)},n=function(b){var c=a(document.getElementById(b.selectionId)),d=c.children("[data-active-selection=true]");if(!d)return void g(0,b);var e=c.children("[aria-selected=true]").index(d);g(e+1,b)},o=function(b){var c=a(document.getElementById(b.suggestionsId)),d=c.children("[aria-selected=true]"),e=c.children("[aria-hidden=false]").index(d);k(e-1,b)},p=function(b){var c=a(document.getElementById(b.inputId)),d=a(document.getElementById(b.suggestionsId));c.attr("aria-expanded",!1).attr("aria-activedescendant",b.selectionId),d.hide().attr("aria-hidden",!0)},q=function(b,f,g,h){var i=a(document.getElementById(f.inputId)),j=a(document.getElementById(f.suggestionsId)),l=!1,m=[];h.children("option").each(function(b,c){a(c).prop("selected")!==!0&&(m[m.length]={label:c.innerHTML,value:a(c).attr("value")})});var n=f.caseSensitive?g:g.toLocaleLowerCase(),o=a.extend({options:m},b,f);d.render("core/form_autocomplete_suggestions",o).done(function(d){j.replaceWith(d),j=a(document.getElementById(f.suggestionsId)),j.show().attr("aria-hidden",!1),j.children().each(function(c,d){d=a(d),b.caseSensitive&&d.text().indexOf(n)>-1||!b.caseSensitive&&d.text().toLocaleLowerCase().indexOf(n)>-1?(d.show().attr("aria-hidden",!1),l=!0):d.hide().attr("aria-hidden",!0)}),i.attr("aria-expanded",!0),l?b.tags||k(0,f):c.get_string("nosuggestions","form").done(function(a){j.html(a)})}).fail(e.exception)},r=function(b,c,d){var e=a(document.getElementById(c.inputId)),f=e.val(),g=f.split(","),j=!1;a.each(g,function(c,e){if(e=e.trim(),""!==e&&(b.multiple||d.children("option").prop("selected",!1),d.children("option").each(function(b,c){a(c).attr("value")==e&&(j=!0,a(c).prop("selected",!0))}),!j)){var f=a("<option>");f.append(e),f.attr("value",e),d.append(f),f.prop("selected",!0),f.attr("data-iscustom",!0)}}),h(b,c,d),i(d),e.val(""),p(c)},s=function(b,c,d){var e=a(document.getElementById(c.inputId)),f=a(document.getElementById(c.suggestionsId)),g=f.children("[aria-selected=true]").attr("data-value");b.multiple||d.children("option").prop("selected",!1),d.children("option").each(function(b,c){a(c).attr("value")==g&&a(c).prop("selected",!0)}),h(b,c,d),i(d),e.val(""),p(c)},t=function(b,c,d,f,g){var h=a(b.currentTarget).val();g.transport(c.selector,h,function(b){var e=g.processResults(c.selector,b),h=[];if(f.children("option").each(function(b,c){c=a(c),c.prop("selected")?h.push(String(c.attr("value"))):c.remove()}),!c.multiple&&0===f.children("option").length){var i=a("<option>");f.append(i)}a.each(e,function(b,c){if(h.indexOf(String(c.value))===-1){var d=a("<option>");d.append(c.label),d.attr("value",c.value),f.append(d)}}),q(c,d,"",f)},e.exception)},u=function(b,c,d){var e=a(document.getElementById(c.inputId));if(e.on("keydown",function(g){switch(g.keyCode){case f.DOWN:return!b.showSuggestions||("true"===e.attr("aria-expanded")?l(c):!e.val()&&b.ajax?require([b.ajax],function(a){t(g,b,c,d,a)}):q(b,c,e.val(),d),g.preventDefault(),!1);case f.UP:return o(c),g.preventDefault(),!1;case f.ENTER:var h=a(document.getElementById(c.suggestionsId));return"true"===e.attr("aria-expanded")&&h.children("[aria-selected=true]").length>0?s(b,c,d):b.tags&&r(b,c,d),g.preventDefault(),!1;case f.ESCAPE:return"true"===e.attr("aria-expanded")&&p(c),g.preventDefault(),!1}return!0}),e.on("keypress",function(a){return a.keyCode!==f.COMMA||(b.tags&&r(b,c,d),a.preventDefault(),!1)}),e.on("behat:set-value",function(){var f=a(document.getElementById(c.suggestionsId));"true"===e.attr("aria-expanded")&&f.children("[aria-selected=true]").length>0?s(b,c,d):b.tags&&r(b,c,d)}),e.on("blur",function(){window.setTimeout(function(){var f=a(document.activeElement);f.attr("id")!=e.attr("id")&&(b.tags&&r(b,c,d),p(c))},500)}),b.showSuggestions){var g=a(document.getElementById(c.downArrowId));g.on("click",function(a){e.focus(),!e.val()&&b.ajax?require([b.ajax],function(e){t(a,b,c,d,e)}):q(b,c,e.val(),d)})}var h=a(document.getElementById(c.suggestionsId));h.parent().on("click","[role=option]",function(e){var f=a(e.currentTarget).closest("[role=option]"),g=a(document.getElementById(c.suggestionsId)),h=g.children("[aria-hidden=false]").index(f);k(h,c),s(b,c,d)});var i=a(document.getElementById(c.selectionId));i.on("click","[role=listitem]",function(e){var f=a(e.currentTarget);j(b,c,f,d)}),i.on("keydown",function(e){switch(e.keyCode){case f.DOWN:return n(c),e.preventDefault(),!1;case f.UP:return m(c),e.preventDefault(),!1;case f.SPACE:case f.ENTER:var g=a(document.getElementById(c.selectionId)).children("[data-active-selection=true]");return g&&(j(b,c,g,d),e.preventDefault()),!1}return!0}),b.showSuggestions&&e.on("input",function(e){var f=a(e.currentTarget).val(),g=a(e.currentTarget).data("last-value");g!==f&&q(b,c,f,d),a(e.currentTarget).data("last-value",f)})};return{enhance:function(f,g,i,j,k,l,m){var n={selector:f,tags:!1,ajax:!1,placeholder:j,caseSensitive:!1,showSuggestions:!0,noSelectionString:m};"undefined"!=typeof g&&(n.tags=g),"undefined"!=typeof i&&(n.ajax=i),"undefined"!=typeof k&&(n.caseSensitive=k),"undefined"!=typeof l&&(n.showSuggestions=l),"undefined"==typeof m&&c.get_string("noselection","form").done(function(a){n.noSelectionString=a}).fail(e.exception);var o=a(f);if(!o)return void b.debug("Selector not found: "+f);o.hide().attr("aria-hidden",!0);var p={selectId:o.attr("id"),inputId:"form_autocomplete_input-"+a.now(),suggestionsId:"form_autocomplete_suggestions-"+a.now(),selectionId:"form_autocomplete_selection-"+a.now(),downArrowId:"form_autocomplete_downarrow-"+a.now()};n.multiple=o.attr("multiple");var q=a("[for="+p.selectId+"]"),r=[];o.children("option").each(function(b,c){r[b]={label:c.innerHTML,value:a(c).attr("value")}});var s=a.extend({},n,p);s.options=r,s.items=[];var v=d.render("core/form_autocomplete_input",s),w=d.render("core/form_autocomplete_suggestions",s),x=d.render("core/form_autocomplete_selection",s);a.when(v,w,x).done(function(b,c,d){o.after(c),o.after(b),o.after(d),q.attr("for",p.inputId),u(n,p,o);var e=a(document.getElementById(p.inputId)),f=a(document.getElementById(p.suggestionsId));f.hide().attr("aria-hidden",!0),n.ajax&&require([n.ajax],function(a){var b=null,c=function(b){t(b,n,p,o,a)},d=function(a){null!==b&&(window.clearTimeout(b),b=null),b=window.setTimeout(c.bind(this,a),300)};e.on("input",d)}),h(n,p,o)})}}});
\ No newline at end of file
+define(["jquery","core/log","core/str","core/templates","core/notification"],function(a,b,c,d,e){var f={DOWN:40,ENTER:13,SPACE:32,ESCAPE:27,COMMA:44,UP:38},g=function(b,c){var d=a(document.getElementById(c.selectionId)),e=d.children("[aria-selected=true]").length;for(b%=e;b<0;)b+=e;var f=a(d.children("[aria-selected=true]").get(b)),g=c.selectionId+"-"+b;d.children().attr("data-active-selection",!1).attr("id",""),f.attr("data-active-selection",!0).attr("id",g),d.attr("aria-activedescendant",g)},h=function(b,c,f){var h=[],i=a(document.getElementById(c.selectionId)),j=i.attr("aria-activedescendant"),k=!1;j&&(k=a(document.getElementById(j)).attr("data-value")),f.children("option").each(function(b,c){a(c).prop("selected")&&h.push({label:a(c).html(),value:a(c).attr("value")})});var l=a.extend({items:h},b,c);d.render("core/form_autocomplete_selection",l).done(function(b){i.empty().append(a(b).html()),k!==!1&&i.children("[aria-selected=true]").each(function(b,d){a(d).attr("data-value")===k&&g(b,c)})}).fail(e.exception)},i=function(a){"undefined"!=typeof M.core_formchangechecker&&M.core_formchangechecker.set_form_changed(),a.change()},j=function(b,c,d,e){var f=a(d).attr("data-value");b.multiple&&e.children("option").each(function(b,c){a(c).attr("value")==f&&(a(c).prop("selected",!1),a(c).attr("data-iscustom")&&a(c).remove())}),h(b,c,e),i(e)},k=function(b,c){var d=a(document.getElementById(c.inputId)),e=a(document.getElementById(c.suggestionsId)),f=e.children("[aria-hidden=false]").length;for(b%=f;b<0;)b+=f;var g=a(e.children("[aria-hidden=false]").get(b)),h=a(e.children("[role=option]")).index(g),i=c.suggestionsId+"-"+h;e.children().attr("aria-selected",!1).attr("id",""),g.attr("aria-selected",!0).attr("id",i),d.attr("aria-activedescendant",i);var j=g.offset().top-e.offset().top+e.scrollTop()-e.height()/2;e.animate({scrollTop:j},100)},l=function(b){var c=a(document.getElementById(b.suggestionsId)),d=c.children("[aria-selected=true]"),e=c.children("[aria-hidden=false]").index(d);k(e+1,b)},m=function(b){var c=a(document.getElementById(b.selectionId)),d=c.children("[data-active-selection=true]");if(!d)return void g(0,b);var e=c.children("[aria-selected=true]").index(d);g(e-1,b)},n=function(b){var c=a(document.getElementById(b.selectionId)),d=c.children("[data-active-selection=true]");if(!d)return void g(0,b);var e=c.children("[aria-selected=true]").index(d);g(e+1,b)},o=function(b){var c=a(document.getElementById(b.suggestionsId)),d=c.children("[aria-selected=true]"),e=c.children("[aria-hidden=false]").index(d);k(e-1,b)},p=function(b){var c=a(document.getElementById(b.inputId)),d=a(document.getElementById(b.suggestionsId));c.attr("aria-expanded",!1).attr("aria-activedescendant",b.selectionId),d.hide().attr("aria-hidden",!0)},q=function(b,f,g,h){var i=a(document.getElementById(f.inputId)),j=a(document.getElementById(f.suggestionsId)),l=!1,m=[];h.children("option").each(function(b,c){a(c).prop("selected")!==!0&&(m[m.length]={label:c.innerHTML,value:a(c).attr("value")})});var n=f.caseSensitive?g:g.toLocaleLowerCase(),o=a.extend({options:m},b,f);d.render("core/form_autocomplete_suggestions",o).done(function(d){j.replaceWith(d),j=a(document.getElementById(f.suggestionsId)),j.show().attr("aria-hidden",!1),j.children().each(function(c,d){d=a(d),b.caseSensitive&&d.text().indexOf(n)>-1||!b.caseSensitive&&d.text().toLocaleLowerCase().indexOf(n)>-1?(d.show().attr("aria-hidden",!1),l=!0):d.hide().attr("aria-hidden",!0)}),i.attr("aria-expanded",!0),l?b.tags||k(0,f):c.get_string("nosuggestions","form").done(function(a){j.html(a)})}).fail(e.exception)},r=function(b,c,d){var e=a(document.getElementById(c.inputId)),f=e.val(),g=f.split(","),j=!1;a.each(g,function(c,e){if(e=e.trim(),""!==e&&(b.multiple||d.children("option").prop("selected",!1),d.children("option").each(function(b,c){a(c).attr("value")==e&&(j=!0,a(c).prop("selected",!0))}),!j)){var f=a("<option>");f.append(e),f.attr("value",e),d.append(f),f.prop("selected",!0),f.attr("data-iscustom",!0)}}),h(b,c,d),i(d),e.val(""),p(c)},s=function(b,c,d){var e=a(document.getElementById(c.inputId)),f=a(document.getElementById(c.suggestionsId)),g=f.children("[aria-selected=true]").attr("data-value");b.multiple||d.children("option").prop("selected",!1),d.children("option").each(function(b,c){a(c).attr("value")==g&&a(c).prop("selected",!0)}),h(b,c,d),i(d),e.val(""),p(c)},t=function(b,c,d,f,g){var h=a(b.currentTarget).val();g.transport(c.selector,h,function(b){var e=g.processResults(c.selector,b),h=[];if(f.children("option").each(function(b,c){c=a(c),c.prop("selected")?h.push(String(c.attr("value"))):c.remove()}),!c.multiple&&0===f.children("option").length){var i=a("<option>");f.append(i)}a.each(e,function(b,c){if(h.indexOf(String(c.value))===-1){var d=a("<option>");d.append(c.label),d.attr("value",c.value),f.append(d)}}),q(c,d,"",f)},e.exception)},u=function(b,c,d){var e=a(document.getElementById(c.inputId));if(e.on("keydown",function(g){switch(g.keyCode){case f.DOWN:return!b.showSuggestions||("true"===e.attr("aria-expanded")?l(c):!e.val()&&b.ajax?require([b.ajax],function(a){t(g,b,c,d,a)}):q(b,c,e.val(),d),g.preventDefault(),!1);case f.UP:return o(c),g.preventDefault(),!1;case f.ENTER:var h=a(document.getElementById(c.suggestionsId));return"true"===e.attr("aria-expanded")&&h.children("[aria-selected=true]").length>0?s(b,c,d):b.tags&&r(b,c,d),g.preventDefault(),!1;case f.ESCAPE:return"true"===e.attr("aria-expanded")&&p(c),g.preventDefault(),!1}return!0}),e.on("keypress",function(a){return a.keyCode!==f.COMMA||(b.tags&&r(b,c,d),a.preventDefault(),!1)}),e.on("behat:set-value",function(){var f=a(document.getElementById(c.suggestionsId));"true"===e.attr("aria-expanded")&&f.children("[aria-selected=true]").length>0?s(b,c,d):b.tags&&r(b,c,d)}),e.on("blur",function(){window.setTimeout(function(){var f=a(document.activeElement);f.attr("id")!=e.attr("id")&&(b.tags&&r(b,c,d),p(c))},500)}),b.showSuggestions){var g=a(document.getElementById(c.downArrowId));g.on("click",function(a){e.focus(),!e.val()&&b.ajax?require([b.ajax],function(e){t(a,b,c,d,e)}):q(b,c,e.val(),d)})}var h=a(document.getElementById(c.suggestionsId));h.parent().on("click","[role=option]",function(e){var f=a(e.currentTarget).closest("[role=option]"),g=a(document.getElementById(c.suggestionsId)),h=g.children("[aria-hidden=false]").index(f);k(h,c),s(b,c,d)});var i=a(document.getElementById(c.selectionId));i.on("click","[role=listitem]",function(e){var f=a(e.currentTarget);j(b,c,f,d)}),i.on("keydown",function(e){switch(e.keyCode){case f.DOWN:return n(c),e.preventDefault(),!1;case f.UP:return m(c),e.preventDefault(),!1;case f.SPACE:case f.ENTER:var g=a(document.getElementById(c.selectionId)).children("[data-active-selection=true]");return g&&(j(b,c,g,d),e.preventDefault()),!1}return!0}),b.showSuggestions&&(b.ajax?require([b.ajax],function(a){var f=null,g=function(e){t(e,b,c,d,a)},h=function(a){null!==f&&(window.clearTimeout(f),f=null),f=window.setTimeout(g.bind(this,a),300)};e.on("input",h)}):e.on("input",function(e){var f=a(e.currentTarget).val(),g=a(e.currentTarget).data("last-value");g!==f&&q(b,c,f,d),a(e.currentTarget).data("last-value",f)}))};return{enhance:function(f,g,i,j,k,l,m){var n={selector:f,tags:!1,ajax:!1,placeholder:j,caseSensitive:!1,showSuggestions:!0,noSelectionString:m};"undefined"!=typeof g&&(n.tags=g),"undefined"!=typeof i&&(n.ajax=i),"undefined"!=typeof k&&(n.caseSensitive=k),"undefined"!=typeof l&&(n.showSuggestions=l),"undefined"==typeof m&&c.get_string("noselection","form").done(function(a){n.noSelectionString=a}).fail(e.exception);var o=a(f);if(!o)return void b.debug("Selector not found: "+f);o.hide().attr("aria-hidden",!0);var p={selectId:o.attr("id"),inputId:"form_autocomplete_input-"+a.now(),suggestionsId:"form_autocomplete_suggestions-"+a.now(),selectionId:"form_autocomplete_selection-"+a.now(),downArrowId:"form_autocomplete_downarrow-"+a.now()};n.multiple=o.attr("multiple");var q=a("[for="+p.selectId+"]"),r=[];o.children("option").each(function(b,c){r[b]={label:c.innerHTML,value:a(c).attr("value")}});var s=a.extend({},n,p);s.options=r,s.items=[];var t=d.render("core/form_autocomplete_input",s),v=d.render("core/form_autocomplete_suggestions",s),w=d.render("core/form_autocomplete_selection",s);a.when(t,v,w).done(function(b,c,d){o.after(c),o.after(b),o.after(d),q.attr("for",p.inputId),u(n,p,o);var e=a(document.getElementById(p.suggestionsId));e.hide().attr("aria-hidden",!0),h(n,p,o)})}}});
\ No newline at end of file
diff --git a/lib/amd/src/form-autocomplete.js b/lib/amd/src/form-autocomplete.js
index 8d5148b461e..e2f87f3eccc 100644
--- a/lib/amd/src/form-autocomplete.js
+++ b/lib/amd/src/form-autocomplete.js
@@ -679,19 +679,40 @@ define(['jquery', 'core/log', 'core/str', 'core/templates', 'core/notification']
         });
         // Whenever the input field changes, update the suggestion list.
         if (options.showSuggestions) {
-            inputElement.on('input', function(e) {
-                var query = $(e.currentTarget).val();
-                var last = $(e.currentTarget).data('last-value');
-                // IE11 fires many more input events than required - even when the value has not changed.
-                // We need to only do this for real value changed events or the suggestions will be
-                // unclickable on IE11 (because they will be rebuilt before the click event fires).
-                // Note - because of this we cannot close the list when the query is empty or it will break
-                // on IE11.
-                if (last !== query) {
-                    updateSuggestions(options, state, query, originalSelect);
-                }
-                $(e.currentTarget).data('last-value', query);
-            });
+            // If this field uses ajax, set it up.
+            if (options.ajax) {
+                require([options.ajax], function(ajaxHandler) {
+                    var throttleTimeout = null;
+                    var handler = function(e) {
+                        updateAjax(e, options, state, originalSelect, ajaxHandler);
+                    };
+
+                    // For input events, we do not want to trigger many, many updates.
+                    var throttledHandler = function(e) {
+                        if (throttleTimeout !== null) {
+                            window.clearTimeout(throttleTimeout);
+                            throttleTimeout = null;
+                        }
+                        throttleTimeout = window.setTimeout(handler.bind(this, e), 300);
+                    };
+                    // Trigger an ajax update after the text field value changes.
+                    inputElement.on("input", throttledHandler);
+                });
+            } else {
+                inputElement.on('input', function(e) {
+                    var query = $(e.currentTarget).val();
+                    var last = $(e.currentTarget).data('last-value');
+                    // IE11 fires many more input events than required - even when the value has not changed.
+                    // We need to only do this for real value changed events or the suggestions will be
+                    // unclickable on IE11 (because they will be rebuilt before the click event fires).
+                    // Note - because of this we cannot close the list when the query is empty or it will break
+                    // on IE11.
+                    if (last !== query) {
+                        updateSuggestions(options, state, query, originalSelect);
+                    }
+                    $(e.currentTarget).data('last-value', query);
+                });
+            }
         }
     };
 
@@ -786,31 +807,10 @@ define(['jquery', 'core/log', 'core/str', 'core/templates', 'core/notification']
                 // Add the event handlers.
                 addNavigation(options, state, originalSelect);
 
-                var inputElement = $(document.getElementById(state.inputId));
                 var suggestionsElement = $(document.getElementById(state.suggestionsId));
                 // Hide the suggestions by default.
                 suggestionsElement.hide().attr('aria-hidden', true);
 
-                // If this field uses ajax, set it up.
-                if (options.ajax) {
-                    require([options.ajax], function(ajaxHandler) {
-                        var throttleTimeout = null;
-                        var handler = function(e) {
-                            updateAjax(e, options, state, originalSelect, ajaxHandler);
-                        };
-
-                        // For input events, we do not want to trigger many, many updates.
-                        var throttledHandler = function(e) {
-                            if (throttleTimeout !== null) {
-                                window.clearTimeout(throttleTimeout);
-                                throttleTimeout = null;
-                            }
-                            throttleTimeout = window.setTimeout(handler.bind(this, e), 300);
-                        };
-                        // Trigger an ajax update after the text field value changes.
-                        inputElement.on("input", throttledHandler);
-                    });
-                }
                 // Show the current values in the selection list.
                 updateSelectionList(options, state, originalSelect);
             });