How To Synchronize Two Select Elements

I was wondering how to synchronize the values and text of two elements. For instance, OneSolution 1: One possible approach:functionsync(el1, el2) { // if there is no el1 argument we quit here:if (!el1) { returnfalse; } else { // caching the value of el1:var val = el1.value; // caching a reference to the element with// with which we should be synchronising values:var syncWith = document.getElementById(el2); // caching the <option> elements of that <select>:var options = syncWith.getElementsByTagName('option'); // iterating over those <option> elements:for (var i = 0, len = options.length; i < len; i++) { // if the value of the current <option> is equal// to the value of the changed <select> element's// selected value:if (options[i].value == val) { // we set the current <option> as// as selected: options[i].selected = true; } } } } // caching the <select> element whose change event should// be reacted-to:var selectToSync = document.getElementById('box1'); // binding the onchange event using an anonymous function: selectToSync.onchange = function(){ // calling the function:sync(this,'box2'); }; Copyfunctionsync(el1, el2) { if (!el1) { returnfalse; } else { var val = el1.value; var syncWith = document.getElementById(el2); var options = syncWith.getElementsByTagName('option'); for (var i = 0, len = options.length; i < len; i++) { if (options[i].value == val) { options[i].selected = true; } } } } var selectToSync = document.getElementById('box1'); selectToSync.onchange = function() { sync(this, 'box2'); };Copy<selectid="box1"><optionvalue="1">One</option><optionvalue="2">Two</option><optionvalue="3">Three</option></select><selectid="box2"><optionvalue="1">One</option><optionvalue="2">Two</option><optionvalue="3">Three</option></select>CopyJS Fiddle demo.Or, revised and updated somewhat:functionsync() { // caching the changed element:let el = this; // retrieving the id of the element we should synchronise with// from the changed-element's data-syncwith custom attribute,// using document.getElementById() to retrieve that that element.document.getElementById( el.dataset.syncwith ) // retrieving the <options of that element// and finding the <option> at the same index// as changed-element's selectedIndex (the index// of the selected <option> amongst the options// collection) and setting that <option> element's// selected property to true: .options[ el.selectedIndex ].selected = true; } // retrieving the element whose changes should be// synchronised with another element:var selectToSync = document.getElementById('box1'); // binding the snyc() function as the change event-handler: selectToSync.addEventListener('change', sync); Copyfunctionsync() { let el = this; document.getElementById(el.dataset.syncwith).options[el.selectedIndex].selected = true; } var selectToSync = document.getElementById('box1'); selectToSync.addEventListener('change', sync);Copy<selectid="box1"data-syncwith="box2"><optionvalue="1">One</option><optionvalue="2">Two</option><optionvalue="3">Three</option></select><selectid="box2"><optionvalue="1">One</option><optionvalue="2">Two</option><optionvalue="3">Three</option></select>CopyJS Fiddle demo.Note that this approach does assume – and requires – that the <option> elements are in the same order.To update the original approach, where the order is irrelevant, using ES6 approaches (and the same data-syncwith custom attribute approach):functionsync() { // caching the changed element (since// we're using it twice):let el = this; // retrieving the id of the element to synchronise 'to' from // the 'data-syncwith' custom attribute of the changed element,// and retrieving its <option> elements. Converting that// Array-like collection into an Array using Array.from():Array.from(document.getElementById(el.dataset.syncwith).options) // Iterating over the array of options using// Array.prototype.forEach(), and using an Arrow function to// pass the current <otpion> (as 'opt') setting that current// <option> element's selected property according to Boolean// returned by assessing whether the current option's value// is (exactly) equal to the value of the changed element: .forEach(opt => opt.selected = opt.value === el.value); } var selectToSync = document.getElementById('box1'); selectToSync.addEventListener('change', sync); Copyfunctionsync() { let el = this; Array.from(document.getElementById(el.dataset.syncwith).options).forEach(opt => opt.selected = opt.value === el.value); } let selectToSync = document.getElementById('box1'); selectToSync.addEventListener('change', sync);Copy<selectid="box1"data-syncwith="box2"><optionvalue="1">One</option><optionvalue="2">Two</option><optionvalue="3">Three</option></select><selectid="box2"><optionvalue="1">One</option><optionvalue="3">Three</option><optionvalue="2">Two</option></select>CopyJS Fiddle demo.If you look at the HTML in the Snippet you'll see that I switched the positions of <option> elements in the second <select> element to demonstrate that the <option> position doesn't matter in this latter approach.References:Array.from().Array.prototype.forEach().Arrow functions.document.getElementById().EventTarget.addEventListener().for loop.HTMLElement.dataset.HTMLSelectElement.let statement.var.Solution 2: In the Actual browsers you dont have to do to much...<selectid="box1"onchange="box2.value=this.value;"><optionvalue="1">One</option><optionvalue="2">Two</option><optionvalue="3">Three</option></select><selectid="box2"><optionvalue="1">One</option><optionvalue="2">Two</option><optionvalue="3">Three</option></select>CopyJsfiddle DEMOSolution 3: Without jQuery: for (var i=0; i<document.getElementById('box1').options.length; i++) if (document.getElementById('box1').options[i].selected) for (var j=0; j<document.getElementById('box2').options.length; j++) if (document.getElementById('box1').options[i].value == document.getElementById('box2').options[j].value) document.getElementById('box2').options[j].selected = true; CopySolution 4: With jQuery:Note:on method requires jQuery > 1.7jQuery(function($) { $('#first').on('change', function() { var sel = $('option:selected', this).val(); $('#second option').filter(function(index, el) { return el.value == sel; }).prop('selected', true); }); });Copy<selectname="first"id="first"autocomplete="off"><optionvalue="0">-- Select one option --</option><optionvalue="1">First</option><optionvalue="2">Second</option><optionvalue="3">Third</option><optionvalue="4">Fourth</option><optionvalue="5">Fifth</option><optionvalue="6">Sixth</option></select><selectname="second"id="second"autocomplete="off"><optionvalue="0">-- Select one option --</option><optionvalue="1">First</option><optionvalue="2">Second</option><optionvalue="3">Third</option><optionvalue="4">Fourth</option><optionvalue="5">Fifth</option><optionvalue="6">Sixth</option></select><scriptsrc="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>Copy Share Post a Comment for "How To Synchronize Two Select Elements" Top Question Right Floated Element Disappears When Using Columns In Firefox I am using an ol element with column-count and column-gap p… Weird Behavior Of Long Presses In Chrome And Firefox For Android So, I found some weird behavior of long presses in Chrome a… JQuery Hide ULs And Only Expand Once Particular Class Set (bit Like An Accordion) Right folks, After battling with a JQuery Accordion trying … Get Mediastreamtrack(audio) From Video I want to record audio from video element alongside recordi… CSS Oval Shape Cut Out From Div The above image is what i'm trying to create but am hav… Display Results From Select Dropdown Then Clone And Add Another Select So I'm building two select dropdowns where the user sel… What Are All Of The Inline-js Attributes New In HTML5? 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