Hide/show the selected option on a secondary select - javascript

I have two <select> elements with different IDs.
When the user selects a value from the first select box, I want the second select box to only display connected values.
My code:
<select id="ExtraField_1" name="ExtraField_1">
<option value="1">test1</option>
<option value="2">test2</option>
<option value="3">test3</option>
<option value="4">test4</option>
<option value="5">test5</option>
<option value="6">test6</option>
<option value="7">test7</option>
<option value="8">test8</option>
<option value="9">test9</option>
<option value="10">test10</option>
<option value="11">test11</option>
<option value="12">test12</option>
</select>
<select id="ExtraField_2" name="ExtraField_2">
<option value="1">test1</option>
<option value="2">test2</option>
<option value="3">test3</option>
<option value="4">test4</option>
<option value="5">test5</option>
<option value="6">test6</option>
<option value="7">test7</option>
<option value="8">test8</option>
<option value="9">test9</option>
<option value="10">test10</option>
<option value="11">test11</option>
<option value="12">test12</option>
<option value="13">test13</option>
<option value="14">test14</option>
<option value="15">test15</option>
<option value="16">test16</option>
<option value="17">test17</option>
<option value="18">test18</option>
<option value="19">test19</option>
<option value="20">test20</option>
</select>
So when user selects "test1" from first select boxm he will see only "test2", "test3" and "test4" on the second select box; "test2" from first will show "test6", "test7" and "test8" in the second box.
How can I use JavaScript to resolve this problem?

If you can use jQuery then you can always just clear and append the options to the second select.
$('#ExtraField_1').change(function(){
$('#ExtraField_2').find('option').remove()
if($(this).val() == '1'){
$('#ExtraField_2').append($("<option </option>").attr('value','2').text('test2'));
$('#ExtraField_2').append($("<option></option>").attr('value','3').text('test3'));
$('#ExtraField_2').append($("<option></option>").attr('value','4').text('test4'));
}
if($(this).val() == '2'){
$('#ExtraField_2').append($("<option></option>").attr('value','5').text('test5'));
$('#ExtraField_2').append($("<option></option>").attr('value','6').text('test6'));
$('#ExtraField_2').append($("<option></option>").attr('value','7').text('test7'));
}
});
​
http://jsfiddle.net/8XVuv/2/
using only javascript is a bit more complicated but I would still take the same approach.
function createOption(otext,oValue){
var newOption = document.createElement('option');
newOption.text = otext;
newOption.value = oValue;
return newOption;
}
function clearSelect(theSelect){
for(var i = 0;i <= theSelect.options.length+1;i++)
{
theSelect.remove();
}
}
function onSelect(theSelect){
var nextSelect = document.getElementById('ExtraField_2');
clearSelect(nextSelect);
var selected = theSelect.options[theSelect.selectedIndex];
if(selected.value == 1){
nextSelect.add(createOption('test2','2'));
nextSelect.add(createOption('test3','3'));
nextSelect.add(createOption('test4','4'));
}
if(selected.value == 2){
nextSelect.add(createOption('test5','5'));
nextSelect.add(createOption('test6','6'));
nextSelect.add(createOption('test7','7'));
}
}
with html:
<select id="ExtraField_1" name="ExtraField_1" onchange="javascript: onSelect(this);" >
<option value="0">Select a test..</option>
<option value="1">test1</option>
<option value="2">test2</option>
<option value="3">test3</option>
<option value="4">test4</option>
<option value="5">test5</option>
<option value="6">test6</option>
<option value="7">test7</option>
<option value="8">test8</option>
<option value="9">test9</option>
<option value="10">test10</option>
<option value="11">test11</option>
<option value="12">test12</option>
</select>
<select id="ExtraField_2" name="ExtraField_2">
<option value="0">Select from the left</option>
</select>​
as you can see it still does what you expect but you are not hiding options.
http://jsfiddle.net/upKzW/13/

$('#ExtraField_1').change(function() {
$('#ExtraField_2').val(this.value);
});
http://jsfiddle.net/judearasu/rF8G6/

Related

Remove duplicate empty values from select tag

I have below select tag
<select id="subCategorySelected">
<option value="Select Sub Category">Select Sub Category</option>
<option value=""></option>
<option value="subcat1">sub cat 1</option>
<option value="subcat2">sub cat 2</option>
<option value=""></option>
<option value="subcat4">sub cat 4</option>
<option value=""></option>
</select>
I need to filter items in the tag and remove all duplicate elements in below way
<select id="subCategorySelected">
<option value="Select Sub Category">Select Sub Category</option>
<option value=""></option>
<option value="subcat1">sub cat 1</option>
<option value="subcat2">sub cat 2</option>
<option value="subcat4">sub cat 4</option>
</select>
I have tried in below ways as suggested in some other question but both are not working
1)
var map = {};
$('#subCategorySelected').each(function () {
if (map[this.value]) {
$(this).remove()
}
map[this.value] = true;
})
2)
$("#subCategorySelected").val(function(idx, val) {
$(this).siblings('[value="'+ val +'"]').remove();
});
Thanks in advance
Check this out
$(document).ready(function(){
$('#subCategorySelected option').each(function(index,val){
var value=$(this).val();
$(this).siblings('[value="'+ value +'"]').remove();
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="subCategorySelected">
<option value="Select Sub Category">Select Sub Category</option>
<option value=""></option>
<option value="subcat1">sub cat 1</option>
<option value="subcat2">sub cat 2</option>
<option value=""></option>
<option value="subcat4">sub cat 4</option>
<option value=""></option>
</select>
If you know the only duplicates are empty values you could just do:
$("#subCategorySelected option[value='']").slice(1).remove();
otherwise your first method works, just change the selector to:
$("#subCategorySelected option")

Car Make/Model dynamic dropdown

I'm setting up a new form on my site, and I'm using some code I found here (Vehicle drop down selector). However, I'm using this code within a form, and once the form is submitted, the values for make/model aren't changed to their respective names, instead showing their form values. Being a complete JS noob, how would I go about changing the values submitted from values to make/model names?
$(document).ready(function() {
var $make = $('#make'),
$model = $('#model'),
$options = $model.find('option');
$make.on('change', function() {
$model.html($options.filter('[value="' + this.value + '"]'));
$model.trigger('change');
}).trigger('change');
var $model = $('#model'),
$year = $('#year'),
$yearOptions = $year.find('option');
$model.on('change', function() {
$year.html($yearOptions.filter('[value="' + this.value + '"]'));
$year.trigger('change');
}).trigger('change');
var $year = $('#year'),
$identifier = $('#identifier'),
$identifierOptions = $identifier.find('option');
$year.on('change', function() {
var filteredIdetifiers = $identifierOptions.filter('[value="' + this.value + '"]');
debugger
if (!($("#make").val() == 3 && $("#model option:selected").text() == 'Falcon')) {
filteredIdetifiers = filteredIdetifiers.filter(function(i, e) {
return e.value !== '3'
});
}
$identifier.html(filteredIdetifiers);
$identifier.trigger('change');
}).trigger('change');
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Vehicle Brand Selector List -->
<select name="make" id="make">
<option value="0">Make</option>
<option value="1">BMW</option>
<option value="2">Daewoo</option>
<option value="3">Ford</option>
<option value="4">Holden</option>
<option value="5">Honda</option>
<option value="6">Hyundai</option>
<option value="7">Isuzu</option>
<option value="8">Kia</option>
<option value="9">Lexus</option>
<option value="10">Mazda</option>
<option value="11">Mitsubishi</option>
<option value="12">Nissan</option>
<option value="13">Peugeot</option>
<option value="14">Subaru</option>
<option value="15">Suzuki</option>
<option value="16">Toyota</option>
<option value="17">Volkswagen</option>
</select>
<!-- Vehicle Model List -->
<select name="model" id="model">
<option value="0">Model</option>
<option class="318i" value="1">318i</option>
<option class="lanos" value="2">Lanos</option>
<option class="courier" value="3">Courier</option>
<option class="falcon" value="3">Falcon</option>
<option class="festiva" value="3">Festiva</option>
<option class="fiesta" value="3">Fiesta</option>
<option class="focus" value="3">Focus</option>
<option class="laser" value="3">Laser</option>
<option class="ranger" value="3">Ranger</option>
<option class="territory" value="3">Territory</option>
<option class="astra" value="4">Astra</option>
<option class="barina" value="4">Barina</option>
<option class="captiva" value="4">Captiva</option>
<option class="colorado" value="4">Colorado</option>
<option class="commodore" value="4">Commodore</option>
<option class="cruze" value="4">Cruze</option>
<option class="rodeo" value="4">Rodeo</option>
<option class="viva" value="4">Viva</option>
</select>
<!-- Vehicle Year List -->
<select name="year" id="year">
<option value="0">Year</option>
<option value="1">1998</option>
<option value="1">1999</option>
<option value="1">2000</option>
<option value="1">2001</option>
<option value="1">2002</option>
<option value="1">2003</option>
<option value="1">2004</option>
<option value="1">2005</option>
<option value="2">1997</option>
<option value="2">1998</option>
<option value="2">1999</option>
<option value="2">2000</option>
<option value="2">2001</option>
<option value="2">2002</option>
<option value="2">2003</option>
<option value="3">1991-1999</option>
<option value="4">1997-2007</option>
<option value="5">1997-2007</option>
<option value="3">2002</option>
<option value="3">2003</option>
<option value="3">2004</option>
<option value="3">2005</option>
<option value="4">1997-2005</option>
<option value="4">1997-2005</option>
<option value="4">1997-2005</option>
<option value="4">1997-2005</option>
<option value="4">1997-2005</option>
<option value="4">1997-2005</option>
<option value="4">1997-2005</option>
<option value="4">1997-2005</option>
</select>
<!-- Vehicle Identity List -->
<select name="identifier" id="identifier">
<option value="0">Type</option>
<option class="E46" value="1">E46</option>
<option class="1997-2003" value="2">N/A</option>
<option class="1997-2007" value="4">N/A</option>
<option class="1997-2007" value="5">N/A</option>
<option class="5041618" value="3">BA</option>
<option class="1997-2005" value="3">AU</option>
<option class="1997-2005" value="3">AU2</option>
<option class="1997-2005" value="4">N/A</option>
<option class="1997-2005" value="4">1997-2005</option>
<option class="1997-2005" value="4">1997-2005</option>
<option class="1997-2005" value="4">1997-2005</option>
<option class="1997-2005" value="4">1997-2005</option>
<option class="1997-2005" value="4">1997-2005</option>
</select>
In every <option> tag there is an attribute called value. This value attribute is what is returned at as the value of the dropdown when that option is selected. Seems like in the code you found they are all simply set to numbers. You can set them to be whatever you want though:
<option value="Ford">Ford</option>
<option class="focus" value="Focus">Focus</option>
FIXING DYNAMIC OPTIONS
I see that modifying the values directly affect how the dynamic options are displayed. For example the value attribute of the car model dropdown is used to filter the car make dropdown by only displaying options with the same value. Instead of using the model dropdown's value attributes to compare with make, we can add a new data- attribute called data-make and filter the model dropdown based on that instead. This allows you to freely modify the value attribute in model. The example code below shows this. You would need to modify your JS so model affects year, and year affects identifier in the same way.
$(document).ready(function() {
var $make = $('#make'),
$model = $('#model'),
$options = $model.find('option');
$make.on('change', function() {
// We now filter model using the data-make attribute, not value
$model.html($options.filter('[data-make="' + this.value + '"]'));
$model.trigger('change');
}).trigger('change');
$('#carForm').submit(function(e) {
e.preventDefault();
let formData = $(this).serializeArray();
let data = {};
for (let i = 0; i < formData.length; i++) {
data[formData[i].name] = formData[i].value;
}
alert('Make: ' + data.make + '\nModel: ' + data.model);
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form id="carForm">
<select name="make" id="make">
<option value="0">Make</option>
<option value="BMW">BMW</option> <!-- These values are now make names -->
<option value="Daewoo">Daewoo</option>
<option value="Ford">Ford</option>
</select>
<!-- Vehicle Model List -->
<!-- Notice the new "data-make" attributes for each -->
<select name="model" id="model">
<option value="0">Model</option>
<option class="318i" value="318i" data-make="BMW">318i</option>
<option class="lanos" value="Lanos" data-make="Daewoo">Lanos</option>
<option class="courier" value="Courier" data-make="Ford">Courier</option>
<option class="falcon" value="Falcon" data-make="Ford">Falcon</option>
<option class="festiva" value="Festiva" data-make="Ford">Festiva</option>
<option class="fiesta" value="Fiesta" data-make="Ford">Fiesta</option>
<option class="focus" value="Focus" data-make="Ford">Focus</option>
</select>
<button type="submit">Submit</button>
</form>
You can get the selected option text like this.
$('#form').submit(function(e) {
e.preventDefault();
var make = $make.find(':selected').text();
}
But it would be good practice to set the value you expect to return as the option value and use a data attribute or class to handle the filtering logic.

Js dropdown depends of an other dropdown

Hey guys simple question how can I display in the second dropdown information that depends of the first one.
Example. I have this:
var option = document.getElementById("second_dropdown").getElementsByTagName("option");
for (var j = 0; j < option.lenght; j++) {
option[j].disabled = true;
}
<!-- DROPDOWN 1 -->
<select id="first_dropdown" name="first_d">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
<!-- DROPDOWN 2 -->
<select id="second_dropdown" name="second_d">
<optgroup label="1">
<option value="100">blabla</option>
<option value="101">blabla</option>
<option value="102">blabla</option>
</option>
<optgroup label="2">
<option value="103">blabla</option>
<option value="104">blabla</option>
<option value="105">blabla</option>
</option>
<optgroup label="3">
<option value="106">blabla</option>
<option value="107">blabla</option>
<option value="108">blabla</option>
</option>
<select>
And I would like to display in dropdown 2 only the optgroup that has been selected in dropdown 1 ...
I really don't know about js so I hope that i explained it well and thanks in advance :)
But here I only disable all (and I want to disable only what's not selected in dropdown one) and I don't want to disable but I want to undisplay.
Loop through optgroup of second <select> and in loop check if value of first select is equal to label of optgroup remove disabled of it.
document.querySelector("#first_dropdown").onchange = function(){
var val = this.value;
document.querySelectorAll("#second_dropdown optgroup").forEach(function(ele){
ele.disabled = ele.label != val
});
};
<select id="first_dropdown" name="first_d">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
<select id="second_dropdown" name="second_d">
<optgroup label="1">
<option value="100">blabla</option>
<option value="101">blabla</option>
<option value="102">blabla</option>
</optgroup>
<optgroup label="2">
<option value="103">blabla</option>
<option value="104">blabla</option>
<option value="105">blabla</option>
</optgroup>
<optgroup label="3">
<option value="106">blabla</option>
<option value="107">blabla</option>
<option value="108">blabla</option>
</optgroup>
<select>
Also you should change display property of element if you want to show/hide optgroup
document.querySelector("#first_dropdown").onchange = function(){
var val = this.value;
document.querySelectorAll("#second_dropdown optgroup").forEach(function(ele){
ele.style.display = ele.label==val ? "block" : "none";
});
};
Also you can do this work simplify using jquery
$("#first_dropdown").change(function(e){
$("#second_dropdown optgroup").css("display", function(){
return this.label==e.target.value ? "block" : "none";
});
});
You can try the following way:
var firstDD = document.getElementById('first_dropdown');
firstDD.addEventListener('change',changeDD);
function changeDD(){
var fValue = firstDD.value;
document.querySelectorAll('#second_dropdown > optgroup').forEach(function(el){
if(el.label != fValue )
el.style.display='none';
else
el.style.display='block';
});
document.querySelector('#second_dropdown').value = "";
}
changeDD(firstDD);
<select id="first_dropdown" name="first_d">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
</select>
<select id="second_dropdown" name="second_d">
<optgroup label="1">
<option value="100">blabla</option>
<option value="101">blabla</option>
<option value="102">blabla</option>
</optgroup>
<optgroup label="2">
<option value="103">blabla 21</option>
<option value="104">blabla</option>
<option value="105">blabla</option>
</optgroup>
<optgroup label="3">
<option value="106">blabla</option>
<option value="107">blabla</option>
<option value="108">blabla</option>
</optgroup>
<select>

Alert when selecting some particular value from drop down in JavaScript

Below are the dropdown data..
<select size="1" name="Test_Data">
<option selected value="Select One">Select One</option>
<option value="Data1">IN-Data1</option>
<option value="Data2">IN-Data2</option>
<option value="Data3">IN-Data3</option>
<option value="Data4">AUS-Data4</option>
<option value="Data5">AUS-Data5</option>
<option value="Data6">US-Data6</option>
<option value="Data7">US-Data7</option>
I want to get alert/pop up when I select the data which is start from IN in drop down list.
Try this:
https://jsfiddle.net/mminetto/bggwnkwj/
var select = $('select[name="Test_Data"]');
select.on('change', function(){
var options = select.children('option:selected');
if(options.length > 0 && options[0].innerText.startsWith("IN")){
alert(this.value);
alert(options[0].innerText);
}
});
<select size="1" name="Test_Data" id="dropdown">
<option selected value="Select One">Select One</option>
<option value="Data1">IN-Data1</option>
<option value="Data2">IN-Data2</option>
<option value="Data3">IN-Data3</option>
<option value="Data4">AUS-Data4</option>
<option value="Data5">AUS-Data5</option>
<option value="Data6">US-Data6</option>
<option value="Data7">US-Data7</option>
in javascript
<script>
$("#dropdown").change(function(){
if($(this).find("option:selected").text().startsWith("IN")){
alert("option with IN selected =>"+$(this).find("option:selected").text());
}
});
</script>
Try this code
HTML
<select size="1" onChange="showAlert()" id="dataCountry" name="Test_Data">
<option selected value="Select One">Select One</option>
<option value="Data1">IN-Data1</option>
<option value="Data2">IN-Data2</option>
<option value="Data3">IN-Data3</option>
<option value="Data4">AUS-Data4</option>
<option value="Data5">AUS-Data5</option>
<option value="Data6">US-Data6</option>
<option value="Data7">US-Data7</option>
</select>
JavaScript
<script>
function showAlert() {
var el = document.getElementById('dataCountry'); // get the index
var text = el.options[el.selectedIndex].innerHTML; // get the label
var n = text.search("IN"); //search number of IN
if(n>=0) {
alert(text);
}
}
</script>

JavaScript dependent

I have two drop downs dependent on each other.
When I'm selecting the FRUIT, I want to show only one Apple value from select2 and hide all the others but when I'm selecting Animal I want to show all the values
Please help me write the Javascript function.
Thanks.
<select name="select1" id="select1">
<option value="1">Fruit</option>
<option value="2">Animal</option>
<option value="3">Bird</option>
<option value="4">Car</option>
</select>
<select name="select2" id="select2">
<option value="1">Banana</option>
<option value="1">Apple</option>
<option value="1">Orange</option>
<option value="2">Wolf</option>
<option value="2">Fox</option>
<option value="2">Bear</option>
<option value="3">Eagle</option>
<option value="3">Hawk</option>
<option value="4">BWM<option>
</select>
//This is my java script function
function display(){
var access=document.getElementById("select1");
var list = document.getElementById("select2");
var selectlist=access[access.selectedIndex].value;
if(selectlist="APPLE"){
list.style.visiblity="hidden";
}else{
list.style.visiblity="block";
}
FIDDLE
//Add eventlistener for change-event
document.getElementById("selCategory").addEventListener("change", filter, false);
//Filter function which will filter on selected value from first select.
function filter()
{
var cat = document.getElementById("selCategory");
var opt = document.getElementById("selOptions");
var selectedValue = cat.options[cat.selectedIndex].value;
var firstEl = false;
var firstIndex = 0;
for(var i = 0; i < opt.options.length; i++)
{
if(opt.options[i].value !== selectedValue)
{
opt.options[i].style.display = "none";
}
else
{
opt.options[i].style.display = "block";
if(!firstEl)
{
firstIndex = i;
firstEl = true;
}
}
}
opt.value = opt.options[firstIndex].value;
}
//Execute on first load, second select is filtered from the start.
filter();
<select name="category" id="selCategory">
<option value="1">Fruit</option>
<option value="2">Animal</option>
<option value="3">Bird</option>
<option value="4">Car</option>
</select>
<select name="options" id="selOptions">
<option value="1">Banana</option>
<option value="1">Apple</option>
<option value="1">Orange</option>
<option value="2">Wolf</option>
<option value="2">Fox</option>
<option value="2">Bear</option>
<option value="3">Eagle</option>
<option value="3">Hawk</option>
<option value="4">BWM<option>
</select>

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