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JavaScript String indexOf() selects also 1&3 instead of only 13

I have this indexOf(), the issue I have is that when norms[] has an dataset like 2,13 that options that are set as selected in norm_id['+nr+'][] are not only the values 2 and 13 but also the values 1 and 3
var element = document.getElementById('norm_id['+nr+'][]');
var values = norms[];
for (var i = 0; i < element.options.length; i++) {
element.options[i].selected = values.indexOf(element.options[i].value) >= 0;
}
Any suggestions how to solve this?

I have solved the issue with the code below.
var element = document.getElementById('calc_norm_id['+nr+'][]');
var values = norms;
var values_split = values.split(',');
for (var i = 0; i < element.options.length; i++)
{
for(var j = 0; j < values_split.length; j++)
{
if(element.options[i].value == values_split[j])
{
element.options[i].selected = element.options[i].value;
}
}
}
#Andreas thx for the tip

Looking at your own answer,
element.options[i].selected = element.options[i].value
does not look right to me - You likely mean
element.options[i].selected = true;
which translates the whole if into
element.options[i].selected element.options[i].value == values_split[j];
This is simpler
const norms = "1,13";
const nr = 1;
var values_split = norms.split(',');
var options = document.getElementById('calc_norm_id[' + nr + '][]').options;
[...options].forEach(opt => opt.selected = values_split.indexOf(opt.value) != -1);
<select id="calc_norm_id[1][]" multiple>
<option value="">Please select</option>
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
</select>

How to filter a list of options using a list of possible values

I'm looking to filter a list of options from a select input and remount the filtered list.
The backend will send over the array of options values that are to be filtered which match to those in the list.
I'm not sure if options is the best attribute to use? (
var initial_options = $('select_id').options
The options are of the form eg
[
'<option value="" selected="">Option 0</option>',
'<option value="1">Option 1</option>'],
...
]
the returned data to be used for filtering is of the form
var option_values_filter = [1,3,5,6]
then mounted with:
$('#select_id').html(filtered_options)

Assuming that your values filter is attempting to filter on the actual value option property you can try something like this:
const option_values_filter = [1, 3, 4];
const filtered = $("#id option").filter((index, option) => {
return (option_values_filter.indexOf(parseInt(option.value)) !== -1);
});
$(id).html(filtered);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select id="id">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
Here is a pure javascript solution:
const option_values_filter = [1, 3, 4];
const selectElement = document.getElementById("id");
const newOptions = Array.apply(null, selectElement.options).filter((option) => {
return option_values_filter.indexOf(parseInt(option.value)) !== -1;
}).map(option => option.outerHTML);
selectElement.innerHTML = newOptions;
<select id="id">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>

This is an answer in combination with your last question. Using pure javascript.
var selectBoxEl = document.getElementById('selectBox');
var arrayOfNodes = selectBoxEl.childNodes;
var optionsArr = [];
var filteredArr = [];
var option_values_filter = [1, 3, 5, 6]
// loop through child nodes of select box and store option nodes as a string in array
for (var i = 0; i < arrayOfNodes.length; i++) {
if (arrayOfNodes[i].nodeName === 'OPTION') {
optionsArr.push(arrayOfNodes[i].outerHTML);
}
}
// function to filter options array and set select box options to filtered array
function filterOptions(filterOps) {
console.log(optionsArr[0].indexOf('value="'));
var val;
for (var i = 0; i < optionsArr.length; i++) {
val = optionsArr[i].substring(optionsArr[i].indexOf('value="') + 7, optionsArr[i].indexOf('value="') + 8);
if (filterOps.indexOf(parseInt(val)) !== -1) {
filteredArr.push(optionsArr[i]);
}
}
selectBoxEl.innerHTML = filteredArr;
}
filterOptions(option_values_filter);
<select id="selectBox">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
<option value="4">Option 4</option>
</select>

Filter options according to optgroup label text

I have one select box with a list of games and the other with filled with a list of consoles. Each game has the possibility to belong to a number of consoles. I'm looking to filter the second select box according to whichever game is selected in the first.
So for instance if I select a game like Forza Horizon that belongs to more than one console then the console select box would filter just those and hide the others.
Right now I have it setup where on a select event it captures the text value of the game. From there I figured to filter through their respective optgroup's label property, which is the console it belongs to. I just can't seem to figure out how to retrieve the other possible consoles it may belong to other than the selected option.
Fiddle
<select class="game-select">
<option value="">Select a game</option>
<optgroup label="PS4"></optgroup>
<option value="1">Forza Horizon 2</option>
<option value="2">The Last of Us</option>
<option value="3">Bioshock Infinite</option>
</optgroup>
<optgroup label="Xbox One">
<option value="1">Forza Horizon</option>
<option value="2">Halo</option>
<option value="3">Bioshock Infinite</option>
</optgroup>
</select>
<select class="console-select">
<option value="">Select a console</option>
<option value="1">PS4</option>
<option value="2">Xbox One</option>
</select>
JS
$(function() {
var gameConsoles = $(".console-select").html();
$(".game-select").on("change", function() {
var game = $(this).find("option:selected").text(),
options = gameConsoles.filter().html(); // Not sure how to filter
if (options) {
$(".console-select").html(options);
} else {
$(".console-select").empty();
}
});
});

Update 2
You can do something like this
$(function () {
var consoleSelect = $('.console-select'),
gameConsoleOptions = $('.console-select option');
$(".game-select").on("change", function () {
var selectedGame = $(this).find("option:selected").data('game'),
games = [],
selectedCategory = $(this).find("option:selected").closest('optgroup').attr('label');
if (selectedGame) {
games = $.makeArray($(this).find('option[data-game="' + selectedGame + '"]').map(function () {
return $(this).closest('optgroup').attr('label');
}));
}
if (games.length) {
gameConsoleOptions.hide();
gameConsoleOptions.filter(function (i, v) {
return games.indexOf($(v).text()) != -1;
}).show();
consoleSelect.find('option:contains('+selectedCategory+')').prop('selected', 'selected');
} else {
gameConsoleOptions.show();
}
});
});
Here is a demo http://jsfiddle.net/dhirajbodicherla/m178xpc3/11/
Update
I added a code to each game using the data-* attribute.
For example the below two games have the same data-game attribute which can be used to figure out that these two are of the same category.
<option value="1" data-game="FH">Forza Horizon 2</option>
<option value="2" data-game="FH">Forza Horizon</option>
Complete example
<select class="game-select">
<option value="">Select a game</option>
<optgroup label="PS4">
<option value="1" data-game="FH">Forza Horizon 2</option>
<option value="2" data-game="LU">The Last of Us</option>
<option value="3" data-game="BI">Bioshock Infinite</option>
</optgroup>
<optgroup label="Xbox One">
<option value="1" data-game="FH">Forza Horizon</option>
<option value="2" data-game="HA">Halo</option>
<option value="3" data-game="BI">Bioshock Infinite</option>
</optgroup>
</select>
<select class="console-select">
<option value="">Select a console</option>
<option value="1">PS4</option>
<option value="2">Xbox One</option>
</select>
This is the script
$(function () {
var gameConsoleOptions = $('.console-select option');
$(".game-select").on("change", function () {
var selectedGame = $(this).find("option:selected").data('game'), games = [];
console.log(selectedGame);
if (selectedGame) {
games = $.makeArray($(this).find('option[data-game="' + selectedGame + '"]').map(function () {
return $(this).closest('optgroup').attr('label');
}));
}
console.log(games);
if (games) {
gameConsoleOptions.hide();
gameConsoleOptions.filter(function (i, v) {
return games.indexOf($(v).text()) != -1;
}).show();
} else {
gameConsoleOptions.show();
}
});
});
Here is a demo http://jsfiddle.net/dhirajbodicherla/m178xpc3/10/
You can do something like this
$(function () {
var gameConsoleOptions = $('.console-select option');
$(".game-select").on("change", function () {
var label = $(this).find("option:selected").closest('optgroup').prop('label');
if (label) {
gameConsoleOptions.hide();
gameConsoleOptions.filter(function (i, v) {
return $(v).text() === label;
}).show();
}else{
gameConsoleOptions.show();
}
});
});
Here is a demo http://jsfiddle.net/dhirajbodicherla/m178xpc3/5/

The code should speak for itself but it all comes down to multiple jQuery filter functions and a clone of the set with options. One advice: Use data attributes instead of relying on the option element text. I updated the fiddle, see link below.
$(function() {
var gameConsoles = $(".console-select");
var consoleOptions = gameConsoles.find('option').clone();
var gameSelect = $(".game-select").on("change", function() {
var game = $(this).find("option:selected").text();
var filteredOptions = $();
gameSelect.find('optgroup').filter(function() {
return $(this).find('option').filter(function() {
return $(this).text() == game;
}).length;
}).each(function () {
var label = $(this).attr('label');
filteredOptions = filteredOptions.add(consoleOptions.filter(function() {
return $(this).text() == label;
}));
});
gameConsoles.html(filteredOptions);
});
});
Fiddle update

Is that what you wanted?
$(".game-select").on("change", function() {
var o = $('option:selected', $(this));
if (!o.val()) {
$('.game-select optgroup').show();
$('.console-select option').show();
return;
}
$('.console-select > option').hide();
var a = $('option:contains("' + o.text() + '")').filter(function() {
return $(this).text() == o.text();
}).each(function() {
var t = $(this);
var l = t.parent().attr('label');
$('.console-select option:contains("' + l + '")').filter(function() {
return l == $(this).text();
}).show();
});
});
$(".console-select").on("change", function() {
var o = $('option:selected', $(this));
if (!o.val()) {
$('.game-select optgroup').show();
$('.console-select option').show();
return;
}
$('.game-select optgroup').hide();
console.log($('.game-select optgroup[label="' + o.text() + '"]'));
$('.game-select optgroup[label="' + o.text() + '"]').show();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select class="game-select">
<option value="">Select a game</option>
<optgroup label="PS4">
<option value="c1">Forza Horizon 2</option>
<option value="c2">The Last of Us</option>
<option value="c3">Bioshock Infinite</option>
</optgroup>
<optgroup label="Xbox One">
<option value="s1">Forza Horizon</option>
<option value="s2">Halo</option>
<option value="s3">Bioshock Infinite</option>
</optgroup>
</select>
<select class="console-select">
<option value="">Select a console</option>
<div>
<option value="c">PS4</option>
<option value="s">Xbox One</option>
</div>
</select>

How to dynamically generate a dropdown menu [closed]

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In my php, I have created two dropdown or selection lists. My drop down list below:
<select name="food">
<option value="">...</option>
<option value="Fruits">Fruits</option>
<option value="Vegetables">Vegetables</option>
</select>
<select name="type">
<option value="">--</option>
<option value="Apple">Apple</option>
<option value="Lettuce">Lettuce</option>
<option value="Orange">Orange</option>
<option value="Tomato">Tomato</option>
<option value="Carrots">Carrots</option>
<option value="Mango">Mango</option>
</select>
m one page to the next.

It's possible to do this using jQuery, but it will quickly become unmanageable in a large-scale app or website.
If you go this route, I would avoid using two different select boxes, as this will force you to choose two different names for the form POST, unless you use more jQuery hackery to remedy this problem.
My suggestion is to look at a lightweight JS framework. Knockoutjs has what you need.
Look at this JSFiddle.
var fruitOpts = ["Apple", "Orange", "Mango"];
var vegOpts = ["Lettuce", "Tomato", "Carrots"];
$("#food").change(function () {
var val = $(this).val();
if (val === "") {
return;
}
$("#type").find('option').not(':first').remove().end();
$.each(val === "Fruits" ? fruitOpts : vegOpts, function (i, v) {
$("#type").append("<option value=\"" + v + "\">" + v + "</option>");
});
$.each(val === "Fruits" ? vegOpts : fruitOpts, function (i, v) {
$("#type").append("<option value=\"" + v + "\">" + v + "</option>");
});
});

It's version for two different php pages:
1.php
<script src="1.js"></script>
<a id='link' href='2.php'>go to another page</a>
<select id="food" name="food" onchange="selectFoodType()">
<option value="">...</option>
<option value="Fruits">Fruits</option>
<option value="Vegetables">Vegetables</option>
<option value="Berries">Berries</option>
</select>
1.js
function selectFoodType()
{
var link = $('#link');
var type = $('select#food option:selected').val();
link.attr('href', link.attr('href') + '?type=' + type);
}
2.php
<script src="2.js"></script>
<select id='type' name="type" data-type='<?=$_GET['type']?>'>
<option value="">--</option>
<option data-type='Fruits' value="Apple">Apple</option>
<option data-type='Vegetables' value="Tomato">Tomato</option>
<option data-type='Vegetables' value="Carrots">Carrots</option>
<option data-type='Berries' value="Strawberry">Strawberry</option>
</select>
2.js
$(function() {
var type = $('select#type').data('type');
var itemsId = document.getElementById("type");
var items = itemsId.getElementsByTagName("option");
var selected_type = [], other_types = [];
selected_type[0] = items[0];
for (var i = 1; i < items.length; i++){
if ($(items[i]).data('type') === type) {
selected_type.push(items[i]);
continue;
}
other_types.push(items[i]);
}
selected_type = selected_type.sort(sortByName);
other_types = other_types.sort(sortByName);
$.merge(selected_type, other_types);
var list = '';
for (i=0; i<selected_type.length; i++) {
list += selected_type[i].outerHTML;
}
$(items).remove();
$(itemsId).append(list);
});
function sortByName(a, b) {
if (a.text > b.text) return 1;
else if (a.text < b.text) return -1;
return 0;
}

You should assign all Fruits and Vegetables contents in JavaScript object and display related contents of food value in another drop down, see below demo
Food:
<select name="food" id="food">
<option value="">...</option>
<option value="Fruits">Fruits</option>
<option value="Vegetables">Vegetables</option>
</select>
Content
<select name="contents" id="contents">
<option value="">...</option>
</select>
JS code
var data = {
'Fruits':['Apple', 'Lettuce', 'Orange', 'Mango'],
'Vegetables': ['Tomato', 'Carrots']
};
document.getElementById("food").onchange = function(Event){
var contents = document.getElementById("contents");
contents.innerHTML = "";
for(var i in data[this.value]){
var option = document.createElement("option");
option.setAttribute('value',data[this.value][i]);
option.text = data[this.value][i];
contents.appendChild(option);
}
var expect_data = Event.target.value == "Fruits" ? "Vegetables" : "Fruits";
for(var i in data[expect_data]){
var option = document.createElement("option");
option.setAttribute('value',data[expect_data][i]);
option.text = data[expect_data][i];
contents.appendChild(option);
}
}
FIDDLE DEMO

you need to use JQuery for this purpose.
See My Solution: http://jsfiddle.net/inventorx/YU4vJ/
Code Here:
HTML
<select name="food" >
<option value="">...</option>
<option value="Fruits">Fruits</option>
<option value="Vegetables">Vegetables</option>
</select>
<select name='type' >
<option>-- Select Food Type --</option>
</select>
<select id='Fruits' style='display:none' >
<option value="">--</option>
<option value="Apple">Apple</option>
<option value="Orange">Orange</option>
<option value="Mango">Mango</option>
</select>
<select id='Vegetables' style='display:none' >
<option value="">--</option>
<option value="Lettuce">Lettuce</option>
<option value="Tomato">Tomato</option>
<option value="Carrots">Carrots</option>
</select>
JQUERY
$(document).ready(function(){
$("select[name='food']").on("change", function(){
var value = $(this).val();
$("select[name='type']").html($("#" + value).html());
});
});

Another option.
The list splits into two arrays: food, corresponding to the selected type; and does not correspond to the selected type. Each of these arrays, in turn, is sorted by name:
JSFIDDLE
HTML:
<select id="food" name="food" onchange="selectFoodType()">
<option value="">...</option>
<option value="Fruits">Fruits</option>
<option value="Vegetables">Vegetables</option>
<option value="Berries">Berries</option>
</select>
<select id='type' name="type">
<option value="">--</option>
<option data-type='Fruits' value="Apple">Apple</option>
<option data-type='Vegetables' value="Lettuce">Lettuce</option>
<option data-type='Vegetables' value="Tomato">Tomato</option>
<option data-type='Berries' value="Strawberry">Strawberry</option>
</select>
JQuery:
function selectFoodType()
{
var type = $('select#food option:selected').val();
var itemsId = document.getElementById("type");
var items = itemsId.getElementsByTagName("option");
var selected_type = [], other_types = [];
selected_type[0] = items[0];
for (var i = 1; i < items.length; i++){
if ($(items[i]).data('type') === type) {
selected_type.push(items[i]);
continue;
}
other_types.push(items[i]);
}
selected_type = selected_type.sort(sortByName);
other_types = other_types.sort(sortByName);
$.merge(selected_type, other_types);
var list = '';
for (i=0; i<selected_type.length; i++) {
list += selected_type[i].outerHTML;
}
$(items).remove();
$(itemsId).append(list);
}
function sortByName(a, b) {
if (a.text > b.text) return 1;
else if (a.text < b.text) return -1;
return 0;
}

Compose a link based in select's option value

I have 2 dropdown menus, and I need to compose a link with it's values.
Here is the code:
<form id="dropdown1">
<select id="linha">
<option value="G12">Option 1</option>
<option value="G11">Option 2</option>
<option value="H89">Option 3</option>
</select>
<select id="dia">
<option value="all">Every day</option>
<option value="work">working days</option>
<option value="sat">saturday</option>
<option value="sun">sunday</option>
</select>
</form>
I need something in JavaScript to "compose" a link with http://somewebsite.com/*selected_linha_value*/*selected_dia_value*
How can I do that?

<select name="dia" id="dia">
<option value="all">Every day</option>
<option value="http://stackoverflow.com">working days</option>
<option value="http://anotherSite.com">saturday</option>
<option value="http://anotherSite2.com">sunday</option>
</select>
<script>
$("#dia").change(function () {
var selctedValue = "";
$("select option:selected").each(function () {
selctedValue += $(this).val();
window.location.href = selctedValue;
});
});

i think u need something like this.
<script type="text/javascript">
params = getParams();
var name1 = unescape(params["linha"]);
switch(name1)
{
case "g12":
window.location = "http://www.google.com"
}
function getParams(){
var idx = document.URL.indexOf('?');
var params = new Array();
if (idx != -1) {
var pairs = document.URL.substring(idx+1, document.URL.length).split('&');
for (var i=0; i<pairs.length; i++){
nameVal = pairs[i].split('=');
params[nameVal[0]] = nameVal[1];
}
}
return params;
}
Its not the full code. It will give you some idea. If you have any doubt just comment

Take a look at: http://jsfiddle.net/ERHhA/
You can use jQuery val() to get the value of the select boxes. Then just append these values to the base url.
var url = "http://somewebsite.com/" + $('#linha').val() + "/" + $('#dia').val();

What about this one?
function make_url(){
var linha = document.getElementById('linha').value;
var dia = document.getElementById('dia').value;
var url=window.location.href;
var pos=url.indexOf('?');
if (pos>-1){
url = url.substr(0,pos);
}
//alert(url + '?linha='+linha+'&dia='+dia); return;
document.location.href = url + '?linha='+linha+'&dia='+dia;
}
fiddle

HTML
<div class="container">
<select class="small-nav">
<option value="" selected="selected">Go To</option>
<option value="http://whiterabbitexpress.com">Services</option>
<option value="http://shop.whiterabbitjapan.com">Shop</option>
</div><!-- container -->
JScript:
$(".small-nav").change(function() {
window.location = $(this).find("option:selected").val();
});