Develop Reference

loop my select options using input="number"?

Here is my Fiddle
<input type="number" id="test" onkeydown="javascript:return event.keyCode==69? false:true" name="form_select" class="text" onchange="showDiv()">
<select id="hidden_div1" style="display:none;" name="form_select">
<option value="0">No</option>
<option value ="1">Yes</option>
</select>
<div id="allcontent1"></div>
<script>
function showDiv(){
allselect="";
getSelectValue = parseInt(document.getElementById("test").value);
if(getSelectValue > 0){
for (let i=0;i<getSelectValue;i++){
allselect+=document.getElementById("hidden_div1").style.display="block";}
}else{
document.getElementById("hidden_div1").style.display="none";
}
document.getElementById("allcontent1").innerHtml = allselect;
}
</script>
I wanted to iterate my select elements, using javascript only

Is there a way to create an Other option with Javascript that causes a textbox to appear

Tried to create an Others option in a drop down menu, which by doing so, activates a textbox to type in.
However, my current method of doing this causes the remaining options to be invisible when clicked, and the textbox does not appear when the Others option is clicked.
function disappear(val) {
var textbox = document.getElementById('issue');
if (val == 'other') {
textbox.style.display = 'block';
} else {
textbox.style.display = 'none';
}
}
<select name="issue" id="issue" onchange='disappear(this.value)'>
<option disabled selected></option>
<option value="bug">Bug</option>
<option value="lacking">Lack of Use</option>
<option value="other">Other</option>
</select>
<div id="textbox"></div>

you are selecting the wrong element
var textbox=document.getElementById('textbox');
function disappear(val){
var textbox=document.getElementById('textbox');
if(val=='other'){
textbox.style.display='block';
}
else{
textbox.style.display='none';
}
}
#textbox{
width:90px;
height:60px;
background-color:red;
display:none;
}
<select name="issue" id="issue" onchange='disappear(this.value)'>
<option disabled selected></option>
<option value="bug">Bug</option>
<option value="lacking">Lack of Use</option>
<option value="other">Other</option>
</select>
<div id="textbox"></div>

that's how you must do it:
var textbox=document.getElementById('textbox');

You're really close! The only thing left is to change the id in the document.getElementById to the correct element and add the input field with the styling.
function disappear(val) {
var textbox = document.getElementById('textbox');
if (val == 'other') {
textbox.style.display = 'block';
} else {
textbox.style.display = 'none';
}
}
<select name="issue" id="issue" onchange='disappear(this.value)'>
<option disabled selected></option>
<option value="bug">Bug</option>
<option value="lacking">Lack of Use</option>
<option value="other">Other</option>
</select>
<input id="textbox" type="text" style="display: none;">

Should your textbox actually be a textarea element? Note: if it's meant to be a div it won't appear on the page (unless you style it) because its content is empty.
Use CSS to initialise the textbox display to none.
In the function you've picked up the select element with your query, and not the textbox element which is why the options are disappearing when you set the display to none. Maybe add an additional check to see if the style is set to block before you set the display to none.
function disappear(val) {
var textbox = document.getElementById('textbox');
if (val == 'other') {
textbox.style.display = 'block';
} else {
if (textbox.style.display === 'block') {
textbox.style.display = 'none';
}
}
}
#textbox { display: none; }
<select name="issue" id="issue" onchange='disappear(this.value)'>
<option disabled selected></option>
<option value="bug">Bug</option>
<option value="lacking">Lack of Use</option>
<option value="other">Other</option>
</select>
<textarea id="textbox"></textarea>

Dynamicly apply css changes on html code with js

here's the situation
I have a select element in my html code, with many option. One of these options is "Other". What I want is, when I select "Other", without refreshing the page, display an input element right under the select one with JS. The problem is that I have to refresh the page to see the change. Can you help me? :)
There's my code :
<label for="select-tribunal" class="form-label">Cadre Légal</label>
<select id="select-tribunal" required class="form-select" aria-label="Default select example">
<?php
foreach ($tribunaux as $tribunal){
echo '<option value="'.$tribunal['id'].'">'.$tribunal['nom'].'</option>';
}
?>
<option value="0">Autre Tribunal</option>
</select>
<input type="text" class="form-control" id="tribunal" style="visibility: hidden" placeholder="Entrez le nom du tribunal">
<script>
var tribunal = document.getElementById("select-tribunal");
if (tribunal.options[tribunal.selectedIndex].value === '0') {
document.getElementById('tribunal').style.visibility = 'visible';
} else {
document.getElementById('tribunal').style.visibility = 'hidden';
}
</script>
Thanks in advance :)

You have to add an eventlistener.
let tribunal = document.getElementById("select-tribunal");
tribunal.addEventListener('change', showInput);
showInput({
target: tribunal
});
function showInput(event) {
if (event.target.value === '0') {
document.getElementById('tribunal').style.visibility = 'visible';
} else {
document.getElementById('tribunal').style.visibility = 'hidden';
}
}
<label for="select-tribunal" class="form-label">Cadre Légal</label>
<select id="select-tribunal" required class="form-select" aria-label="Default select example">
<option value="1">Option 1</option>
<option value="2">Option 2</option>
<option value="3">Option 3</option>
<option value="0" selected>Autre Tribunal</option>
</select>
<input type="text" class="form-control" id="tribunal" style="visibility: hidden" placeholder="Entrez le nom du tribunal">

Since php is running on server the page have to reload in order to see the changes you need to use JavaScript for for this task since you want to see the changes without reload
var select = document.querySelector("#mySelect");
var input = document.querySelector("#myInput");
select.addEventListener("change", function(event){
if(event.target.value === "other"){
input.style.display="block"
}else{
input.style.display="none"
}
})
<select id="mySelect">
<option value="a">A</option>
<option value="a">B</option>
<option value="c">C</option>
<option value="other">Other</option>
</select>
<input style="display: none" type="text" id="myInput">

Drop down text input option

I want a drop down element where user can select from available options or select enter value option which in turn allows to enter value.
I specifically want that user can enter value only when they select "Enter a value " option.
Here is what I have tried so far.
HTML-
<div class="ginput_container">
<select name="input_4" id="input_1_4" class="medium gfield_select" tabindex="15">
<option value="0">None</option>
<option value="155">1-70</option>
<option value="185">71-250</option>
<option value="*">Enter value</option>
</select>
<input type="text" value="None" class="holder" >
</div>
JavaScript-
jQuery(".gfield_select").change(function() {
var val = jQuery(this).val();
var enter = jQuery(this).parent().find('option:selected').text();
var x = jQuery(this).parent();
if (enter ==="Enter a value" || enter === "Enter value"){
var holder = x.find('.holder');
holder.val('');
holder.prop('disabled',false);
holder.focus();
} else {
x.find('.holder').val(x.find('option:selected').text());
}
});
JS fiddle
however it wont work properly if i click the enter value option again.

I think there are many plugins that do what you want but if you want to create your own, it's a basic and simple solution.
You can create a select and a textbox with display:none like this:
<select id="ddlDropDownList">
<option value="1">Item 1</option>
<option value="2">Item 2</option>
<option value="3">Item 3</option>
<option value="-1">Enter Value</option>
</select>
<input id="txtTextBox" type="text" />
<style>
#txtTextBox{
display:none;
}
</style>
then try this JQuery:
$("#ddlDropDownList").change(function(){
if($(this).val() == '-1'){
$("#txtTextBox").fadeIn();
}else{
$("#txtTextBox").fadeOut();
}
});
Check JSFiddle Demo

I have forked your JSFiddle to http://jsfiddle.net/pwdst/4ymtmf7b/1/ which I hope does what you wanted to achieve.
HTML-
<div class="ginput_container">
<label for="input_1_4">Select option</label>
<select class="medium gfield_select" id="input_1_4" name="input_4" tabindex="15">
<option value="0">None</option>
<option value="155">1-70</option>
<option value="185">71-250</option>
<option value="*">Enter value</option>
</select>
<div>
<label class="hidden-label" for="input_1_4_other">Other value</label>
<input class="holder" id="input_1_4_other" disabled="disabled" name="input_1_4_other" placeholder="None" type="text" />
</div>
</div>
JavaScript-
jQuery(".gfield_select").change(function() {
var $this = jQuery(this);
var val = $this.val();
var holder = $this.parent().find('.holder');
if (val === "*"){
holder.val('');
holder.removeAttr('disabled');
holder.focus();
} else {
holder.val(this.options[this.selectedIndex].text);
holder.attr('disabled', 'disabled');
}
});
When the "Enter value" option is chosen then the input box is enabled, value set to an empty string, and it is focused. If another option is chosen then the text input is disabled again, and the text value from the select list is used.

Thanks guys
I guess i have found my answer
HTML-
<div class="ginput_container">
<select name="input_4" id="input_1_4" class="medium gfield_select" tabindex="15">
<option value="0">None</option>
<option value="155">1-70</option>
<option value="185">71-250</option>
<option value="*">Enter value</option>
</select>
<input type="text" value="None" class="holder" >
</div>
JavaScript-
jQuery(".gfield_select").change(function() {
var val = jQuery(this).val();
var enter = jQuery(this).parent().find('option:selected').text();
var x = jQuery(this).parent();
if (enter ==="Enter a value" || enter === "Enter value"){
var holder = x.find('.holder');
holder.val('');
holder.prop('disabled',false);
holder.focus();
jQuery(this).val("0"); // Change select value to None.
} else {
x.find('.holder').val(x.find('option:selected').text());
x.find('.holder').prop('disabled',true);
}
});
JS FIDDLE

How can I show a hidden div when a select option is selected?

I want to use plain JavaScript. I have a drop down list (<select> with a number of <option>s). When a certain option is selected I want a hidden div to display.
<select id="test" name="form_select">
<option value="0">No</option>
<option value ="1" onClick"showDiv()">Yes</option>
</select>
<div id="hidden_div" style="display: none;">Hello hidden content</div>
Then I'm trying it with this vanilla JavaScript code:
function showDiv(){
document.getElementById('hidden_div').style.display = "block";
}
I'm guessing my problem is with the onClick trigger in my options but I'm unsure on what else to use?

try this:
function showDiv(divId, element)
{
document.getElementById(divId).style.display = element.value == 1 ? 'block' : 'none';
}
#hidden_div {
display: none;
}
<select id="test" name="form_select" onchange="showDiv('hidden_div', this)">
<option value="0">No</option>
<option value="1">Yes</option>
</select>
<div id="hidden_div">This is a hidden div</div>

Try handling the change event of the select and using this.value to determine whether it's 'Yes' or not.
jsFiddle
JS
document.getElementById('test').addEventListener('change', function () {
var style = this.value == 1 ? 'block' : 'none';
document.getElementById('hidden_div').style.display = style;
});
HTML
<select id="test" name="form_select">
<option value="0">No</option>
<option value ="1">Yes</option>
</select>
<div id="hidden_div" style="display: none;">Hello hidden content</div>

I think this is an appropriate solution:
<select id="test" name="form_select" onchange="showDiv(this)">
<option value="0">No</option>
<option value="1">Yes</option>
</select>
<div id="hidden_div" style="display:none;">Hello hidden content</div>
<script type="text/javascript">
function showDiv(select){
if(select.value==1){
document.getElementById('hidden_div').style.display = "block";
} else{
document.getElementById('hidden_div').style.display = "none";
}
}
</script>

You should hook onto the change event of the <select> element instead of on the individual options.
var select = document.getElementById('test'),
onChange = function(event) {
var shown = this.options[this.selectedIndex].value == 1;
document.getElementById('hidden_div').style.display = shown ? 'block' : 'none';
};
// attach event handler
if (window.addEventListener) {
select.addEventListener('change', onChange, false);
} else {
// of course, IE < 9 needs special treatment
select.attachEvent('onchange', function() {
onChange.apply(select, arguments);
});
}
Demo

Being more generic, passing values from calling element (which is easier to maintain).
Specify the start condition in the text field (display:none)
Pass the required option value to show/hide on ("Other")
Pass the target and field to show/hide ("TitleOther")
function showHideEle(selectSrc, targetEleId, triggerValue) {
if(selectSrc.value==triggerValue) {
document.getElementById(targetEleId).style.display = "inline-block";
} else {
document.getElementById(targetEleId).style.display = "none";
}
}
<select id="Title"
onchange="showHideEle(this, 'TitleOther', 'Other')">
<option value="">-- Choose</option>
<option value="Mr">Mr</option>
<option value="Mrs">Mrs</option>
<option value="Miss">Miss</option>
<option value="Other">Other --></option>
</select>
<input id="TitleOther" type="text" title="Title other" placeholder="Other title"
style="display:none;"/>

Check this code. It awesome code for hide div using select item.
HTML
<select name="name" id="cboOptions" onchange="showDiv('div',this)" class="form-control" >
<option value="1">YES</option>
<option value="2">NO</option>
</select>
<div id="div1" style="display:block;">
<input type="text" id="customerName" class="form-control" placeholder="Type Customer Name...">
<input type="text" style="margin-top: 3px;" id="customerAddress" class="form-control" placeholder="Type Customer Address...">
<input type="text" style="margin-top: 3px;" id="customerMobile" class="form-control" placeholder="Type Customer Mobile...">
</div>
<div id="div2" style="display:none;">
<input type="text" list="cars" id="customerID" class="form-control" placeholder="Type Customer Name...">
<datalist id="cars">
<option>Value 1</option>
<option>Value 2</option>
<option>Value 3</option>
<option>Value 4</option>
</datalist>
</div>
JS
<script>
function showDiv(prefix,chooser)
{
for(var i=0;i<chooser.options.length;i++)
{
var div = document.getElementById(prefix+chooser.options[i].value);
div.style.display = 'none';
}
var selectedOption = (chooser.options[chooser.selectedIndex].value);
if(selectedOption == "1")
{
displayDiv(prefix,"1");
}
if(selectedOption == "2")
{
displayDiv(prefix,"2");
}
}
function displayDiv(prefix,suffix)
{
var div = document.getElementById(prefix+suffix);
div.style.display = 'block';
}
</script>

<select id="test" name="form_select" onchange="showDiv()">
<option value="0">No</option>
<option value ="1">Yes</option>
</select>
<div id="hidden_div" style="display: none;">Hello hidden content</div>
<script>
function showDiv(){
getSelectValue = document.getElementById("test").value;
if(getSelectValue == "1"){
document.getElementById("hidden_div").style.display="block";
}else{
document.getElementById("hidden_div").style.display="none";
}
}
</script>

you can use the following common function.
<div>
<select class="form-control"
name="Extension for area validity sought for"
onchange="CommonShowHide('txtc1opt2', this, 'States')"
>
<option value="All India">All India</option>
<option value="States">States</option>
</select>
<input type="text"
id="txtc1opt2"
style="display:none;"
name="Extension for area validity sought for details"
class="form-control"
value=""
placeholder="">
</div>
<script>
function CommonShowHide(ElementId, element, value) {
document
.getElementById(ElementId)
.style
.display = element.value == value ? 'block' : 'none';
}
</script>

function showDiv(divId, element)
{
document.getElementById(divId).style.display = element.value == 1 ? 'block' : 'none';
}
#hidden_div {
display: none;
}
<select id="test" name="form_select" onchange="showDiv('hidden_div', this)">
<option value="0">No</option>
<option value="1">Yes</option>
</select>
<div id="hidden_div">This is a hidden div</div>

take look at my solution
i want to make visaCard-note div to be visible only if selected cardType is visa
and here is the html
<select name="cardType">
<option value="1">visa</option>
<option value="2">mastercard</option>
</select>
here is the js
var visa="1";//visa is selected by default
$("select[name=cardType]").change(function () {
document.getElementById('visaCard-note').style.visibility = this.value==visa ? 'visible' : 'hidden';
})