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How do I change select to input text while checkbox is checked?

It's my first contact with js so please don't hate me
I have something like this:
function Zmiana(isChecked) {
document.getElementById('test').type = 'text';
}
<div class="dropdown">
<select id="test" name="producent" class="dropdown-select">
<option value="Apple">Apple</option>
<option value="Samsung">Samsung</option>
<option value="Lenovo">Lenovo</option>
</select> <br>
</div>
But it doesn't work

You won't be changing the select into a textbox. Instead, you'll have both a select and a textbox. The checkbox will simply determine which is shown.
Also, your select should include a first choice that is not considered valid so that you don't get a submitted value that the user didn't choose.
.hidden { display:none; }
<input type="checkbox" id="check">Check to enter text directly
<div class="dropdown">
<select id="test" name="producent" class="dropdown-select">
<option value="">--- Choose ---</option>
<option value="Apple">Apple</option>
<option value="Samsung">Samsung</option>
<option value="Lenovo">Lenovo</option>
</select>
<input id="data" class="hidden">
</div>
<script>
let text = document.getElementById('data');
let check = document.getElementById("check");
let select = document.getElementById("test");
// You must set up your function to handle the
// click event of the checkbox
check.addEventListener("click", Zmiana);
function Zmiana(){
// Add or remvoe the hidden class based on
// whether it's already in use
select.classList.toggle("hidden");
text.classList.toggle("hidden");
}
</script>

How to pass dropdown value with "other" option through php?

enter image description hereI want to pass the option value to another page. For this purpose I have some options. Besides there is an "other" option where an input field is hidden. My javascript code works i.e; selection of "others" appear the desired text input. But while passing the value (submitting) the "other" option (input field) pass the value but not the regular option.
function CheckColors(val) {
var element = document.getElementById('color_change');
if (val == 'pick a color' || val == 'others')
element.style.display = 'block';
else
element.style.display = 'none';
}
<form action="action_dropdown.php" method="post">
<select name="color" onchange='CheckColors(this.value);'>
<option>pick a color</option>
<option value="red">RED</option>
<option value="blue">BLUE</option>
<option value="others">others</option>
</select>
<input type="text" name="color" id="color_change" style='display:none;' />
<input value="calculation" type="submit">
</form>
$myVariable = $_POST["color"];
echo $myVariable;
I expect my output would be red/ blue/ (while selecting any of them).
Again I want my output would be yellow (when I choose "ohters" and input "yellow".)
Being a novice I Hope your cordial cooperation.

You need to rename your input element by any other as below:
<form action="action_dropdown.php" method="post">
<select name="color" onchange='CheckColors(this.value);'>
<option>pick a color</option>
<option value="red">RED</option>
<option value="blue">BLUE</option>
<option value="others">others</option>
</select>
<input type="text" name="othercolor" id="color_change" style='display:none;' />
<input value="calculation" type="submit">
</form>
And when your form is submitted, you need to check whether othercolor is set or not. Thus you can get color value like below:
$selectedColor = ($_POST['color'] == "others" ) ? $_POST['othercolor']: $_POST['color'];
Thus, you will be able to access both select and input values. Hope it helps you!

Add a text field to html dropdown

I have a html dropdown field where there should be a text field added at the bottom naming other.The text typed in this field should come as other:text
drop down html is :
<select name="drop">
<option selected="selected">Please select ...</option>
<option value="car">car</option>
<option value="bike">bike</option>
<option value="Other">Other</option>
</select>
Here other should be text field.For understanding i kept other as option,but i want that to be a input text field where value is given by user.
Thanks in advance

You could add hidden input field by default for other text :
<input type='text' id='other' name='other' style="display:none"/>
And capture the change on select in your js then check if selected option value equal Other and show the field or hide it :
$('select').on('change', function(){
if($(this).val()=='Other'){
$('#other').show().focus();
}else{
$('#other').val('').hide();
}
})
Hope this helps.
$('select').on('change', function(){
if($(this).val()=='Other'){
$('#other').show().focus();
}else{
$('#other').val('').hide();
}
})
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select name="drop">
<option selected="selected">Please select ...</option>
<option value="car">car</option>
<option value="bike">bike</option>
<option value="Other">Other</option>
</select>
<input type='text' id='other' name='other' style="display:none" value='other:'/>

<script type="text/javascript">
function showfield(name){
if(name=='Other')document.getElementById('div1').innerHTML='Other: <input type="text" name="other" />';
else document.getElementById('div1').innerHTML='';
}
</script>
<select name="drop" id="drop" onchange="showfield(this.options[this.selectedIndex].value)">
<option selected="selected">Please select ...</option>
<option value="car">car</option>
<option value="bike">bike</option>
<option value="Other">Other</option>
</select>
<div id="div1"></div>

you could go the other way and make all options accessible by the text field - but giving an autocomplete option as the user types. This can be done with jQuery autocomplete plugins etc or the new html5 datalist. This ties a predetermined set of options to the textfield - allowing the user to select from it if theinput value matches the value, but also allows for alternative text to be entered if there are no matches. Just note though that Safari (and possible other browsers) do not support this feature yet. But its very cool when it is supported.
<input id="transportOptions" list="transport">
<datalist id="transport">
<option value="Car">
<option value="Bike">
<option value="Scooter">
<option value="Taxi">
<option value="Bus">
</datalist>

How can a visitor add options to a menu through text fields?

I have the following drop down menu.
<select id="MySelectMenu">
<option value="#">-*-*- Main Accounts -*-*-</option>
<option value="http://www.google.com">Google</option>
<option value="http://www.yahoo.com">Yahoo</option>
<option value="http://www.example.com">Example</option>
</select>
Is it possible for me to add two text input fields where the visitor can populate the menu options themselves?
For example, in text field one they input the url for the option, and text field two, they input the name of the option.
So...
Text field one: http://www.randomwebsite.com
Text field two: Random Website
Then an 'Add' button, which would result in this...
<select id="MySelectMenu">
<option value="#">-*-*- Main Accounts -*-*-</option>
<option value="http://www.google.com">Google</option>
<option value="http://www.yahoo.com">Yahoo</option>
<option value="http://www.example.com">Example</option>
<option value="http://www.randomwebsite.com">Random Website</option>
</select>
This is the javascript for the current menu, if this helps.
<script type="text/javascript">
function newSrc() {
var e = document.getElementById("MySelectMenu");
var newSrc = e.options[e.selectedIndex].value;
document.getElementById("MyFrame").src=newSrc;
}
</script>
Thanks in advance.

Yes Create two textboxes and Add id's to them and also create a button with a onclick function "Add", Then use the following javascript which is nothing but creating the option and appending to selectbox
function Add()
{
var x = document.getElementById("MySelectMenu");
var opt = document.createElement("option");
opt.value= document.getElementById("url").value;
opt.innerHTML = document.getElementById("name").value; // whatever property it has
x.add(opt);
}
<select id="MySelectMenu">
<option value="#">-*-*- Main Accounts -*-*-</option>
<option value="http://www.google.com">Google</option>
<option value="http://www.yahoo.com">Yahoo</option>
<option value="http://www.example.com">Example</option>
</select>
<input type="text" name="name" id="name">
<input type="url" name="url" id="url">
<button onclick="Add()">ADD</button>

Try below code
var url=$("#txtUrl").val();
var textValue = $("#txtDisplay").val();
$('#MySelectMenu').append("<option value='"+url+"'>"+textValue+"</option>);
use this code on OnClick event of Add button.

Link two combo boxes Javascript/HTML

I'm new to Javascript and I'm trying to link two comboboxes ! In the first combo box I have the names of some states in greece and in the other the cities ! In the second I have all the cities in Greece and I want when I select a state from the first combo box only certain cities to appear on the second ! For example if I select Attikis , then I want to be shown in dropdown menu only Agias Paraskeuis and not Agias Varvaras and Agiou Dimitriou and vice versa !
My code is this :
<form action="?" method="get">
<div class="jtype">
<label for="nomos"> Νομός </label>
<form name="nomoi_poleis" action="">
<select id="combo_nomoi" name="combo_nomoi" onchange="cityChange()" >
<option value="attikis"> Attikis</option>
<option value="thessalonikis"> Thessalonikis</option>
</select>
<br></br>
<label for="poli">Πόλη</label>
<select id="poleis" name="poleis">
<option value="agias varvaras"> Agias Varvara</option>
<option value="agias paraskeuis">Agias Paraskeuis</option>
<option value="agiou dimitriou"> Agiou Dimitriou</option>
</select>
</form>
</div>
</form>
Ana my JS :
<script type="text/javascript">
function changeCity(){
var nomos = document.getElementById("combo_nomoi");
if (nomos.value == "attikis"){
document.getElementById("attikis");
}
else{
document.getElementById("thessalonikis");
}
}
</script>

0The easiest way is to have a set of <select> menus, all but one of which has its display property set to none, with the one you want to display set to inline. Then in your onchange handler you run through your list of selects in a loop, setting the display property accordingly. Note inline event handlers like that are not very good practice; better to set them up via JavaScript in your page initialisation code. It misght look something like:
(HTML)
<select id="states">
<option value="0" selected="selected">State 1</option>
<option value="1">State 2</option>
...
</select>
<select id="cities_0" style="display: inline;">
<option value="...">Name 1</option>
<option value="...">Name 2</option>
...
</select>
<select id="cities_1" style="display: none;">
<option value="...">Name 1</option>
<option value="...">Name 2</option>
...
</select>
JavaScript
function change_city(evt)
{
var states=document.getElementById('states'),whichstate;
whichstate=states.options[state.selectedIndex].value;
for(var i=0;i<states.options.length;i++)
document.getElementById('cities_'+i).style.display=(i==whichstate ? 'inline' : 'none');
}

The following is a crude example(using only JS) to get this working:
http://jsfiddle.net/FMZ2H/
HTML
<form action="?" method="get">
<div class="jtype">
<label for="nomos">Νομός</label>
<form name="nomoi_poleis" action="">
<select id="combo_nomoi" name="combo_nomoi">
<option value="attikis">Attikis</option>
<option value="thessalonikis">Thessalonikis</option>
</select>
<br></br>
<label for="poli">Πόλη</label>
<select id="poleis" name="poleis">
<option id="option1" value="agias varvaras">Agias Varvara</option>
<option id="option2" value="agias paraskeuis">Agias Paraskeuis</option>
<option id="option3" value="agiou dimitriou">Agiou Dimitriou</option>
</select>
</form>
Javascript:
document.getElementById("combo_nomoi").onchange = cityChange
function cityChange() {
var elem = document.getElementById("combo_nomoi");
if (elem.options[elem.selectedIndex].text == "Attikis") {
document.getElementById("option1").disabled = true;
document.getElementById("option2").disabled = false;
document.getElementById("option3").disabled = false;
}
if (elem.options[elem.selectedIndex].text == "Thessalonikis") {
document.getElementById("option1").disabled = false;
document.getElementById("option2").disabled = true;
document.getElementById("option3").disabled = true;
}
}
As shown above, you could disable the options you don't want your user to select. I'll leave it to you to do it an better way than selecting each option by their id.