Hiding an option if its selected in the other select box JavaScript - javascript

I want to hide the option in the selection box if the option is already selected in another box. I am not sure where the problem is in my code, I tried running it on different editors it didn't work. Here is my code:
<html>
<head>
<title>Currency Converter</title>
</head>
<body>
<script langauge="javascript">
function CheckDropDowns() {
ListOfSelectedCountires = [];
for (CountryNumber = 0; CountryNumber < 3; CountryNumber++) {
ListOfSelectedCountires[CountryNumber] = document.getElementById("country" + (CountryNumber + 1)).value;
}
for (algoritmCountryNumber = 0; algoritmCountryNumber < 3; algoritmCountryNumber++) {
for (countryOptions = 1; countryOptions < 5; countryOptions++) {
document.getElementById("country" + (algoritmCountryNumber + 1)).options[countryOptions].style.display = "block";
for (processedOption = 0; processedOption < 3; processedOption++) {
if (document.getElementById("country" + (algoritmCountryNumber + 1).options[countryOptions].value == ListOfSelectedCountires[processedOption]) {
document.getElementById("country" + (algoritmCountryNumber + 1)).options[countryOptions].style.display = "none";
}
}
}
}
}
</script>
<section>
<select id="country1" onchange="CheckDropDowns()">
<option value="">Choose</option>
<option value="1">Australia</option>
<option value="2">Indonesian Rupiah</option>
<option value="3">Chinese Yaun</option>
<option value="4">Japanese Yen</option>
</select>
Convert to
<select id="country2" onchange="CheckDropDowns()">
<option value="">Choose</option>
<option value="1">Australia</option>
<option value="2">Indonesian Rupiah</option>
<option value="3">Chinese Yaun</option>
<option value="4">Japanese Yen</option>
</select>
</section>
</body>
</html>

First determine which select needs to be filtered, then loop through the options setting display to block first(to undo the previous filter), and then if the option's value matches the selected value set it's display to none.
Edit
Above method does not work in every browser. The better HTML5 way is to set and remove the hidden attribute. I've updated the snippet.
window.CheckDropDowns = function(thisSelect) {
var otherSelectId = ("country1" == thisSelect.id) ? "country2" : "country1";
var otherSelect = document.getElementById(otherSelectId);
for (i = 0; i < otherSelect.options.length; i++) {
//otherSelect.options[i].style.display = 'block';
otherSelect.options[i].removeAttribute('hidden');
if (otherSelect.options[i].value == thisSelect.value) {
//otherSelect.options[i].style.display = 'none';
otherSelect.options[i].setAttribute('hidden', 'hidden');
}
}
}
<section>
<select id="country1" onchange="CheckDropDowns(this)">
<option value="">Choose</option>
<option value="1">Australia</option>
<option value="2">Indonesian Rupiah</option>
<option value="3">Chinese Yaun</option>
<option value="4">Japanese Yen</option>
</select>
Convert to
<select id="country2" onchange="CheckDropDowns(this)">
<option value="">Choose</option>
<option value="1">Australia</option>
<option value="2">Indonesian Rupiah</option>
<option value="3">Chinese Yaun</option>
<option value="4">Japanese Yen</option>
</select>
</section>

I don't know what's wrong with your code, the logic seems convoluted. You can't reliably hide options by setting their display to 'none', in some browsers they remain visible. If it was that simple, life would be easy.
You can hide options by removing them from the list, but then you have to remember where they came from so you can put them back when the selection changes.
In the following, each time an option is selected, if there's one stored it's put back and the one matching the selected option is removed. If the first option is selected, the stored one is just put back, nothing is removed.
This only depends on the two selects having the same class value, they could be related by some other value (e.g. a data-* property).
Hopefully the comments are sufficient.
var matchSelected = (function() {
// Store for "hidden" node
var nodeStore = {
sourceElement: null,
node: document.createDocumentFragment(),
index: null
};
return function(evt) {
// Get the element that got the event
var tgt = this;
// If there's a stored option, put it back
if (nodeStore.sourceElement) {
let sel = nodeStore.sourceElement;
sel.insertBefore(nodeStore.node.firstChild, sel.options[nodeStore.index]);
nodeStore.sourceElement = null;
nodeStore.node = document.createDocumentFragment();
nodeStore.index = null;
}
// If the selected option is the first one, stop here
if (tgt.selectedIndex == 0) return;
// Get all selects with the same className
var sels = document.querySelectorAll('.' + this.className);
// Get the "other" option
var other = sels[0] == this ? sels[1] : sels[0];
// Remove and keep the option on the other element that is the same
// as the selected option on the target element
nodeStore.sourceElement = other;
nodeStore.index = tgt.selectedIndex;
nodeStore.node.appendChild(other.options[tgt.selectedIndex]);
}
}());
window.addEventListener('DOMContentLoaded', function() {
document.querySelectorAll('.countrySelect').forEach(
node => node.addEventListener('change', matchSelected, false)
);
}, false);
<select id="country1" class="countrySelect">
<option value="" selected>Choose</option>
<option value="1">Australia Dollar</option>
<option value="2">Indonesian Rupiah</option>
<option value="3">Chinese Yaun</option>
<option value="4">Japanese Yen</option>
</select>
Convert to
<select id="country2" class="countrySelect">
<option value="" selected>Choose</option>
<option value="1">Australia Dollar</option>
<option value="2">Indonesian Rupiah</option>
<option value="3">Chinese Yaun</option>
<option value="4">Japanese Yen</option>
</select>

Related

JavaScript: option hiding code not working in some browsers

My JavaScript skills are pretty basic, but I've written this code where you select from the dropdown on the left (Select1) an option which shows only the specified options in the dropdown on the right (Select2), and hides the rest.
I've also put it in a codepen here, in case you want to fiddle.
The code seems to work in both of the above environments in Firefox 90.0.2, but it fails in both and writes nothing to the console in Chrome 92.0.4515.131.
Any ideas why it's working in Firefox but not Chrome (and others) and what I can do so it works on all major browsers.
I'm running Windows 10 and I'd like to avoid iQuery if practical, as I don't want to get into learning or using that yet, as I'm starting with the basics.
Thanks.
Here's the code:
<!DOCTYPE html>
<html>
<head>
<script>
function hide_options(select_id,type)
{
//alert("hide_options(select_id="+select_id+", type="+type+")");
console.log("hide_options(select_id="+select_id+", type="+type+")");
var x = document.getElementById(select_id);
for (i=1; i<x.options.length; i++)
{
x.options[i].style.display = "none";
}
x.options[0].selected = true;
if (type == 'A')
{ unhide_options(select_id,"one","two") }
if (type == 'B')
{ unhide_options(select_id,"two","three") }
if (type == 'C')
{ unhide_options(select_id,"two") }
}
function unhide_options(select_id,...opts)
{
//alert("unhide_options(select_id="+select_id+"opts="+opts+")");
console.log("unhide_options(select_id="+select_id+"opts="+opts+")");
for (i=0; i<opts.length; i++)
{
document.getElementById(select_id+"_"+opts[i]).style.display = "";
}
}
</script>
</head>
<body>
<p>Selecting an option in the "Select1" dropdown should show only those options in the "Select2" dropdown.</p>
<select name=select1>
<option>Select1...</option>
<option onclick="hide_options('field1','A')">Show options 1 + 2 only</option>
<option onclick="hide_options('field1','B')">Show options 2 + 3 only</option>
<option onclick="hide_options('field1','C')">Show option 2 only</option>
</select>
<select name=update_action id=field1>
<option value=''>Select2...</option>
<option value=one id=field1_one>One</option>
<option value=two id=field1_two>Two</option>
<option value=three id=field1_three>Three</option>
</select>
</body>
</html>
Perhaps Chrome doesn't emit an event on clicking an option - however, you can use the change event on the select
I've used data-* attributes for the options, and I also show/hide in the one loop
the showing object is just a nice easy way to configure what should show, so you don't need if/else if/else if etc - I find this easier to maintain then countless if else if`'s
const selects = document.querySelectorAll('.filterer');
const showing = {
A: ["one", "two"],
B: ["two", "three"],
C: ["two"]
};
selects.forEach(select => {
select.addEventListener('change', function(e) {
const {
target,
value
} = this[this.selectedIndex].dataset;
const show = showing[value] || [];
const x = document.getElementById(target) || [];
[...x]
.slice(1)
.forEach(option =>
option.style.display = (show.length === 0 || show.includes(option.value)) ? '' : 'none'
);
if (x && x[0]) {
x[0].selected = true;
}
});
});
<p>Selecting an option in the "Select1" dropdown should show only those options in the "Select2" dropdown.</p>
<select id="select1" name="select1" class="filterer">
<option>Select1...</option>
<option data-target='field1' data-value='A'>Show options 1 + 2 only</option>
<option data-target='field1' data-value='B'>Show options 2 + 3 only</option>
<option data-target='field1' data-value='C'>Show option 2 only</option>
</select>
<select name=update_action id=field1>
<option value=''>Select2...</option>
<option value=one id=field1_one>One</option>
<option value=two id=field1_two>Two</option>
<option value=three id=field1_three>Three</option>
</select>
<br/>
<hr/>
<select id="select2" name="select2" class="filterer">
<option>Select1...</option>
<option data-target='field2' data-value='A'>Show options 1 + 2 only</option>
<option data-target='field2' data-value='B'>Show options 2 + 3 only</option>
<option data-target='field2' data-value='C'>Show option 2 only</option>
</select>
<select name=update_action id=field2>
<option value=''>Select2...</option>
<option value=one id=field2_one>One</option>
<option value=two id=field2_two>Two</option>
<option value=three id=field2_three>Three</option>
</select>
Alternative. You mention in a comment that the Selects and Options are created dynamically on the server code
The following would allow you to do that, and to specify the visible selections given the current choice, all in the option data-values attribute
Nothing needs hard coding in javascript this way
const selects = document.querySelectorAll('.filterer');
selects.forEach(select => {
select.addEventListener('change', function(e) {
const { target, values } = this[this.selectedIndex].dataset;
const show = values.split(',').map(s => s.trim());
const x = document.getElementById(target) || [];
[...x]
.slice(1)
.forEach(option =>
option.style.display = (show.length === 0 || show.includes(option.value)) ? '' : 'none'
);
if (x && x[0]) {
x[0].selected = true;
}
});
});
<p>Selecting an option in the "Select1" dropdown should show only those options in the "Select2" dropdown.</p>
<select id="select1" name="select1" class="filterer">
<option>Select1...</option>
<option data-target='field1' data-values='one, two'>Show options 1 + 2 only</option>
<option data-target='field1' data-values='two, three'>Show options 2 + 3 only</option>
<option data-target='field1' data-values='two'>Show option 2 only</option>
</select>
<select name='update_action' id='field1'>
<option value=''>Select2...</option>
<option value='one' id='field1_one'>One</option>
<option value='two' id='field1_two'>Two</option>
<option value='three' id='field1_three'>Three</option>
</select>
<br/>
<hr/>
<br/>
<select id="select2" name="select2" class="filterer">
<option>Select1...</option>
<option data-target='field2' data-values='apple,banana'>Apple and banana</option>
<option data-target='field2' data-values='banana,pineapple'>Banana and pineapple</option>
<option data-target='field2' data-values='pineapple'>Pineapple</option>
</select>
<select name='update_action' id='field2'>
<option value=''>Select2...</option>
<option value='pineapple' id='field2_one'>Pineapple</option>
<option value='banana' id='field2_two'>Banana</option>
<option value='apple' id='field2_three'>Apple</option>
</select>
Sure, this may require changing server code, but your original code did have hard coded logic for A B and C - this code, the server code can emit anything it likes and the javascript doesn't need to be changed

javascript select alphabetically sorting

I am trying to sort option alphabetically
My Html is
<select id="myOpt">
<option value="" selected data-default>Select Name</option>
<option value="3">John Snow</option>
<option value="34">Arya Stark</option>
<option value="54">Sansa Stark</option>
<option value="4">Hound</option>
</select>
js
var options = $("#myOpt option");
options.detach().sort(function(a,b) {
var at = $(a).text();
var bt = $(b).text();
return (at > bt)?1:((at < bt)?-1:0);
});
options.appendTo("#myOpt");
it sorts option correctly but now instead of selected option it shows last option. My question is how to show selected option instead of last option and can it be done by another client side method? since for big list it making page slow
Try this,
var options = $("#myOpt option");
var selectedVal = '';
options.detach().sort(function(a,b) {
var at = $(a).text();
var bt = $(b).text();
if($(a).attr('selected') || $(b).attr('selected')){
selectedVal = $(a).attr('selected') ? $(a).val() : $(b).val();
return false;
}
return (at > bt)?1:((at < bt)?-1:0);
});
options.appendTo("#myOpt");
$('#myOpt').val(selectedVal);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="myOpt">
<option value="" selected data-default>Select Name</option>
<option value="3">John Snow</option>
<option value="34">Arya Stark</option>
<option value="54">Sansa Stark</option>
<option value="4">Hound</option>
</select>
Don't select the 1st option to sort. var options = $("#myOpt option:not(:eq(0))");
You may use web workers to avoid browser frize if this a big list.
also, you can put it inside setTimeout to push it in event loop
$(function() {
var options = $("#myOpt option:not(:eq(0))");
options.detach().sort(function(a, b) {
var be = $(b);
var ae = $(a);
if (be.attr('selected')) {
selectedVal = be.val();
return 1;
}
if (ae.attr('selected')) {
selectedVal = ae.val();
return -1;
}
var at = ae.text();
var bt = be.text();
return (at > bt) ? 1 : ((at < bt) ? -1 : 0);
});
options.appendTo("#myOpt");
$("#myOpt").val(selectedVal);
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="myOpt">
<option value="" selected data-default>Select Name</option>
<option value="3">John Snow</option>
<option value="34">Arya Stark</option>
<option value="54">Sansa Stark</option>
<option value="4">Hound</option>
</select>
$(function() {
var options = $("#myOpt option");
options.detach().sort(function(a, b) {
var be = $(b);
var ae = $(a);
if (be.attr('selected')) {
selectedVal = be.val();
return 1;
}
if (ae.attr('selected')) {
selectedVal = ae.val();
return -1;
}
var at = ae.text();
var bt = be.text();
return (at > bt) ? 1 : ((at < bt) ? -1 : 0);
});
options.appendTo("#myOpt");
$("#myOpt").val(selectedVal);
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="myOpt">
<option value="" selected data-default>Select Name</option>
<option value="3">John Snow</option>
<option value="34">Arya Stark</option>
<option value="54">Sansa Stark</option>
<option value="4">Hound</option>
</select>
To do the sort using native JavaScript may actually give you somewhat more readable code, while taking advantage of operations (like shift/unshift) that jQuery does not implement.
The selection issue is occurring because an option detached from it's parent select cannot be selected - so you need to either select the first option again.
document.addEventListener("DOMContentLoaded", function() {
var options = $("#myOpt option").detach()
options = $.makeArray(options);
var first = options.shift();
options.sort( (a,b) => a.text.localeCompare(b.text) );
options.unshift(first);
$("#myOpt").append(options);
$("#myOpt option").eq(0).prop("selected", true)
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="myOpt">
<option value="" selected data-default>Select Name</option>
<option value="3">John Snow</option>
<option value="34">Arya Stark</option>
<option value="54">Sansa Stark</option>
<option value="4">Hound</option>
</select>
You may want to simply just leave the selected element alone and just detach/sort the others, which ends up being quite a bit simpler:
document.addEventListener("DOMContentLoaded", function() {
var options = $("#myOpt option").not('[value=""]').detach();
options.sort( (a,b) => a.text.localeCompare(b.text) );
$("#myOpt").append(options);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="myOpt">
<option value="" selected data-default>Select Name</option>
<option value="3">John Snow</option>
<option value="34">Arya Stark</option>
<option value="54">Sansa Stark</option>
<option value="4">Hound</option>
</select>

How to get selected values in SumoSelect dropdown?

I am using the SumoSelect dropdown for multiselect options. But i cannot get the selected values array.
Below the sample code :
<script type="text/javascript">
$(document).ready(function () {
window.testSelAll = $('.testSelAll').SumoSelect({okCancelInMulti:true, selectAll:true });
$('.btnOk').on('click', function(){
var obj = [];
$('option:selected').each(function () {
obj.push($(this).index());
alert("Selected Values=="+$(this).val());
});
for (var i = 0; i < obj.length; i++) {
$('.testSelAll')[0].sumo.unSelectItem(obj[i]);
}
});
});
</script>
<select multiple="multiple" placeholder="Share Your Friends" onchange="console.log($(this).children(':selected').length)" class="testSelAll">
<option value="1">Volvo</option>
<option value="2">Saab</option>
<option value="3">Mercedes</option>
<option value="audi">Audi</option>
<option value="bmw">BMW</option>
<option value="porsche">Porche</option>
<option value="ferrari">Ferrari</option>
<option value="mitsubishi">Mitsubishi</option>
</select>
If you want the selected values instead of the text, just change .text() to .val().
If you want to get the array, see below with working example at the bottom.
jQuery
$(document).ready(function() {
$('.testSelAll').SumoSelect({
okCancelInMulti: true,
selectAll: true
});
$('.btnOk').on('click', function() {
var obj = [],
items = '';
$('.testSelAll option:selected').each(function(i) {
obj.push($(this).val());
$('.testSelAll')[0].sumo.unSelectItem(i);
});
for (var i = 0; i < obj.length; i++) {
items += ' ' + obj[i]
};
alert(items);
});
});
HTML
<select multiple="multiple" class="testSelAll">
<option value="car1">Volvo</option>
<option value="car2">Saab</option>
<option value="car3">Mercedes</option>
<option value="car4">Audi</option>
</select>
Working JSFIDDLE
You can get them from underlying hidden select element.
using jquery eg.
$('.select1 option:selected')
I think the cleanest way to do this. Is to take advantage of html5 select element underlying SumoSelect.
HTML
<select multiple="multiple" class="testSelAll" id="multi-select">
<option value="car1">Volvo</option>
<option value="car2">Saab</option>
<option value="car3">Mercedes</option>
<option value="car4">Audi</option>
</select>
Javascript
var values = $('#multi-select').val();
This line will return a string list of the values selected.

Display items of drop down based on each other

1) I have two drop downs with exactly the same values. I want the drop down 2 to display the values based on the selection of items of drop down 1. So the selected index of drop down 2 will be equal to or more than the selected index of drop down 1. ( this code is working)
but When I add one more drop down and based on its items the other two dropdowns should behave as:
2) If I select TCD in the first Dropdown and change to value B in the second dropdown the value should be B in the third dropdown too but If I select BCD from the first dropdown it should retain the values of other two dropdown from the previous selection.( should not go back to A)
The first part is working but the second part is having issues.
Fiddle : 1) http://jsfiddle.net/wtLm4805/2/
Fiddle with three dropdowns : 2) http://jsfiddle.net/wtLm4805/3/
while (select2.firstChild) {
select2.removeChild(select2.firstChild);
}
for (var i = 0; i < select1.options.length; i++) {
var o = document.createElement("option");
o.value = select1.options[i].value;
o.text = select1.options[i].text;
(i < select1.selectedIndex)
? o.disabled = true
: o.disabled = false ;
select2.appendChild(o);
}
Where am I going wrong ?
You can go somewhere along these lines
var typeValue = 'TCD'; // default initialisation
$('#Type').change(function(){
var value = $(this).val();
console.log(value);
if(value == 'TCD')
{
typeValue = 'TCD';
// change something in other selects too
}
else if(value == 'MCD')
{
typeValue = 'MCD';
}
else if(value == 'BCD')
{
$('#SELECTA').val('B');
$('#SELECTB').val('B');
typeValue = 'BCD';
}
});
$('#SELECTA').change(function(){
var value = $(this).val();
console.log(value);
if(typeValue = 'TCD')
{
$('#SELECTB').val(value);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select name="Type" id="Type" >
<option value="TCD">TCD</option>
<option value="MCD" >MCD</option>
<option value="BCD" >BCD</option>
</select>
<select id="SELECTA" class="SELECTA">
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
<option value="D">D</option>
</select>
<select id="SELECTB" class="SELECTB" >
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
<option value="D">D</option>
</select>
Since you have only one element with class SELECTA and one with class SELECTB, these will always be undefined:
var select1 = document.getElementsByClassName("SELECTA")[1];
var select2 = document.getElementsByClassName("SELECTB")[1];
var select1 = document.getElementsByClassName("SELECTA")[2];
var select2 = document.getElementsByClassName("SELECTB")[2];
If you're trying to target the options, you could move the classes to the options themselves, or you could reference them like this:
document.getElementsByClassName("SELECTA")[0].options[1]
Not sure why you're deleting/adding items to the SELECTB element, but is this what you're going for?
function clickButton() {
var Type= document.getElementById('Type');
var select1= document.getElementById('SELECTA');
var select2= document.getElementById('SELECTB');
if(Type.value === 'TCD') {
for(var i = 0 ; i < select1.options.length ; i++) {
select2.options[i].disabled= i < select1.selectedIndex;
}
select2.value= select1.value;
}
else {
for(var i = 0 ; i < select2.options.length ; i++) {
select2.options[i].disabled= false;
}
}
}
<select name="Type" id="Type" onchange="clickButton()">
<option value="TCD">TCD</option>
<option value="MCD">MCD</option>
<option value="BCD">BCD</option>
</select>
<select id="SELECTA" onchange="clickButton()">
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
<option value="D">D</option>
</select>
<select id="SELECTB">
<option value="A">A</option>
<option value="B">B</option>
<option value="C">C</option>
<option value="D">D</option>
</select>

Can I pass multiple Id's inside a document.getelementbyID?

I have a form which has got 45 dropdownlist and I m using the bottom code for its
validation.
how can I use only one function of bottom code to do validation for all of my 45 dropdownlist ??
Here is the Function
function Validate()
{
var e = document.getElementById("dropdownlistone");
var strUser = e.options[e.selectedIndex].value;
var strUser1 = e.options[e.selectedIndex].text;
if(strUser==0)
{
alert("Please select a user");
}
}
----- HTML CODE
<select id="dropdownlistone">
<option value="0">Select</option>
<option value="1">test1</option>
<option value="2">test2</option>
<option value="3">test3</option>
</select>
<input type="button" onClick="Validate()" value="select"/>
This is a case when you need to use classes. Then use querySelectorAll method:
function Validate() {
var e = document.querySelectorAll(".dropdownlistone");
for (var i = 0; i < e.length; i++) {
var strUser = e[i].options[e[i].selectedIndex].value;
var strUser1 = e[i].options[e[i].selectedIndex].text;
if (strUser == 0) {
alert("Please select a user");
return;
}
}
}
Demo: http://jsfiddle.net/cwNaH/
And here is one more example with more user friendly validation messages: http://jsfiddle.net/cwNaH/1/
You can use DOM Method getElementsByTagName for select box and set an data-attr to "validate" for those whom you want to validate, if you dont want it to be validate simply don't add the above mentioned attribute.
Ex. HTML
<select id="sel1" data-attr="validate">
<option value="0">Select</option>
<option value="1">test1</option>
<option value="2">test2</option>
<option value="3">test3</option>
</select>
<select id="sel2" data-attr="validate">
<option value="0">Select</option>
<option value="1">test1</option>
<option value="2">test2</option>
<option value="3">test3</option>
</select>
JavaScript
function validate()
{
var ele = document.getElementsByTagName("select");
for(var i=0;i<ele.length;i++)
{
if(ele.getAttribute("data-attr") && ele.getAttribute("data-attr")=='validate')
{
// you have all 47 select boxes whoose data-attr is validate
// each select box will be in ele[i]
var value= ele[i].options[ele[i].selectedIndex].value;
var text= ele[i].options[ele[i].selectedIndex].text;
alert( value+ " : " + text);
}
}
}

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