Develop Reference

Select datalist value on input change and populate the form using jQuery javascript

I am trying to do autocomplete, when input is changed and an option is selected from the datalist, then I want the form and text field to be populated with selected value/text from the datalist.
I tried many options from similar questions here on stackexchange, but not able to make it work.
Help!
$(document).ready(function() {
$('#UserCity').on('input', function() {
var str = "";
console.log($(this).val());
$("#UserCitySelect").on('select', function() {
str += $(this).text() + " ";
});
str = $("#UserCitySelect option:selected").text()
console.log(str);
document.getElementById("selected").text = str;
document.getElementById("selecteddiv").innerHTML = str;
console.log($(this).val());
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" name="UserCity" id="UserCity" label="User City" max_length="25" list="UserCitySelect" required="">
<p id="selected"><p>
<div id="selecteddiv"><div>
<datalist id="UserCitySelect">
<option value="Los Angeles">Los Angeles</option>
<option value="New York">New York</option>
<option value="Chicago">Chicago</option>
</datalist>

:selected does not work on datalist options, as one datalist can provide suggestions for multiple inputs. If two different inputs contain two different suggestions from the list, which would be the selected one?
you can check the value of the input on change with event of input text and assign the value in div with the id.
$(document).ready(function() {
$("input[name='UserCity']").on('input', function(e){
var selectedVal = $(this).val();
document.getElementById("selected").innerHTML = selectedVal ;
document.getElementById("selecteddiv").innerHTML = selectedVal ;
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" name="UserCity" id="UserCity" label="User City" max_length="25" list="UserCitySelect" required="">
<datalist id="UserCitySelect">
<option value="Los Angeles">Los Angeles</option>
<option value="New York">New York</option>
<option value="Chicago">Chicago</option>
</datalist>
<p id="selected"></p>
<div id="selecteddiv"><div>

How can I pass a value from input field to a select option using jquery?

I'm using the following code to pass a value from a select option to a given input field.
$(".itemconditionmenu").change(function() {
var conditionofitem = $(this).val();
$("#meta_itemcondition").val(conditionofitem);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<select id="itemcondition" class="itemconditionmenu">
<option value="">Choose Condition</option>
<option value="New">New</option>
<option value="Used">Used</option>
</select>
<input id="meta_itemcondition" type="text" value="New">
But how can I pass the value of the input field back to the select option value using jQuery?

I am not sure what you are exactly looking, however, as per my understanding I have modifed your code samples.. You can check below snippet.
$( document ).ready(function() {
var conditionofitem = $("#meta_itemcondition").val();
$(".itemconditionmenu").val(conditionofitem);
});
$(".itemconditionmenu").change(function() {
var conditionofitem = $(this).val();
if(conditionofitem == '') {
$("#meta_itemcondition").val('Choose Condition');
} else {
$("#meta_itemcondition").val(conditionofitem);
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<select id="itemcondition" class="itemconditionmenu">
<option value="">Choose Condition</option>
<option value="New">New</option>
<option value="Used">Used</option>
</select>
<input id="meta_itemcondition" type="text" value="New">
Please check and let me know if you have any further queries.

Try this
$("#addOption").click(function(){
$("#itemconditionmenu").append('<option value="'+$("#meta_itemcondition").val()+'" selected="selected">'+$("#meta_itemcondition").val()+'</option>');
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="itemconditionmenu">
<option value="1">1</option>
<option value="2">2</option>
</select>
<input id="meta_itemcondition" type="text" value=""></input>
<button id="addOption">ADD</button>

Example for the same: Blur out your input and value option will be added to select dropdown
$(".itemconditionmenu").change(function() {
var conditionofitem = $(this).val();
$("#meta_itemcondition").val(conditionofitem);
});
$("#meta_itemcondition").blur(function() {
var inputValue = $(this).val();
var o = new Option(inputValue, inputValue);
$(o).html(inputValue);
$("#itemcondition").append(o);
$("#itemcondition").val(inputValue);
});
$( document ).ready(function() {
var value = $("#meta_itemcondition").val();
console.log(value)
var alreadyOption = false;
$("#itemcondition option").each(function()
{
alreadyOption = $(this).val() === value;
if(alreadyOption) {
$("#itemcondition").val(value);
}
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<select id="itemcondition" class="itemconditionmenu">
<option value="">Choose Condition</option>
<option value="New">New</option>
<option value="Used">Used</option>
</select>
<input id="meta_itemcondition" type="text" value="New"/>

Here you can find inline functionality
if you enter a value in textbox value append in drop-down
if you select drop-down value auto set in textbox.
Note: add value in textbox change just input focus
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select class="jsSelect" onchange="$('.jsTextBox').val($(this).val())">
<option value="1">1</option>
<option value="2">2</option>
</select>
<input class="jsTextBox" onchange="if($(this).val()!=''){$('.jsSelect').append($('<option></option>').attr('value',$(this).val()).text($(this).val()));$('.jsSelect').val($(this).val());}" type="text" value="">

How to send a value from a select to an input text in html using javascript?

I am trying to send a value to an based on a selection from a dropdown list such as . I want to fetch the value of possiblePhone.id and send it to .
<script>
function copyTextValue() {
var text1 = document.getElementById("source").value;
document.getElementById("destination").value = text1;
}
</script>
<div>
<select th:field="${possiblePhones}">
<option value="0">select phone</option>
<option id="source" onselect="copyTextValue()"
th:each="possiblePhone : ${possiblePhones}"
th:value="${possiblePhone.id}"
th:text="${possiblePhone.model}"></option>
</select>
</div>
<td><input type="text" id="destination"> </td>
For example, if "Samsung" is selected then "1" should be send to the input field and so on. Actually, i do not get any output.

<select id="source" onchange="copyTextValue()">
<option value="0">select phone</option>
<option value="1">samsung</option>
<option value="2">something</option>
</select>
The id="source" attribute should be in <select> element, also change onselect to onchange and move it to <select> element too.
Codepen: https://codepen.io/anon/pen/WVxLpz

You can achieve this by setting the listener to the select element and then query the selected option value.
I made a minimal example with two brands:
<script>
function copyTextValue() {
var e = document.getElementById("select");
var val = e.options[e.selectedIndex].value;
document.getElementById("destination").value = val;
}
</script>
<div>
<select onchange="copyTextValue()" id="select">
<option value="0">select phone</option>
<option value="1">Brand 1</option>
<option value="2">Brand 2</option>
</select>
</div>
<td><input type="text" id="destination"> </td>

one of the simple thing you have to observe here is that you have to capture the event when the dropdown is selected, and pass the current dropdown reference to your method.
<script>
function copyTextValue(selectedOption) {
if(selectedOption.selectedIndex <= 0){
document.getElementById("destination").value = '';
return;
}
var selectedOptionValue = selectedOption.value;
document.getElementById("destination").value = selectedOptionValue;
}
</script>
<div>
<select onChange="copyTextValue(this);">
<option value="0">select phone</option>
<option value="1">select first phone</option>
<option value="2">select second phone</option>
<option value="3">select third phone</option>
<option value="4">select fourth phone</option>
</select>
</div>
<td><input type="text" id="destination"> </td>
here you are also trying to avoid to pass any value to the textbox when the first element is selected. #kryptur's answer is also correct, but this is simpler.

You're using Thymeleaf. For these you to create a form to send you data to the server.
Follow this link for documentation for your exact problems.
https://www.thymeleaf.org/doc/tutorials/2.1/thymeleafspring.html#creating-a-form
As Frameworks like Thymeleaf usually store state on the server which means you update server first - and then your UI gets updated.

what value return is the value of the select field what you need to do is get the text of selected option i.e
function copyTextValue() {
var selectNode = document.getElementById("source");
enter code here
document.getElementById("destination").value =
selectNode .options[selectNode .selectedIndex].textContent;
}

Javascript change input value when select option is selected

I am very new to javascript. So i have a select option and an input field. What i want to achieve is to have the value of the input field change when i select a particular option. This is what i have tried:
First Name: <input type="text" value="colors">
<select name="">
<option>Choose Database Type</option>
<option onclick="myFunction(g)>green</option>
<option onclick="myFunction(r)>red</option>
<option onclick="myFunction(o)>orange</option>
<option onclick="myFunction(b)>black</option>
</select>
<script>
function myFunction(g) {
document.getElementById("myText").value = "green";
}
function myFunction(r) {
document.getElementById("myText").value = "red";
}
function myFunction(o) {
document.getElementById("myText").value = "orange";
}
function myFunction(b) {
document.getElementById("myText").value = "black";
}
</script>

A few things:
You should use the onchange function, rather than onclick on each individual option.
Use a value attribute on each option to store the data, and use an instance of this to assign the change (or event.target)
You have no ID on your text field
You're missing the end quote for your onclick function
<select name="" onchange="myFunction(event)">
<option disabled selected>Choose Database Type</option>
<option value="Green">green</option>
<option value="Red">red</option>
<option value="Orange">orange</option>
<option value="Black">black</option>
</select>
And the function:
function myFunction(e) {
document.getElementById("myText").value = e.target.value
}
And add the ID
<input id="myText" type="text" value="colors">
Fiddle: https://jsfiddle.net/gasjv4hs/

More proper way is to put your JS code in a different .js file and use Jquery as when you go further with your programming this is the proper way.
Your HTML
<input type="text" id="color" name="color">
<select name="" id="changeData">
<option>Choose Database Type</option>
<option data-value="green">green</option>
<option data-value="red">red</option>
<option data-value="orange">orange</option>
<option data-value="black">black</option>
</select>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
</script>
Your JS
$(document).ready(function () {
$('#changeData').change(function(){
var color = $(this).val();
$('#color').val(color);
})
});
Also make sure that you have added Jquery Library to your Project. You can either download Jquery and add in your project folder OR also you can use CDN. in this example CDN is used.

I came up with a similar problem. In my case i was trying to change the minimum value of an input based on the value of an option in a select list. I tried to apply the above solutions but nothing worked. So i came with this, which can be applied to problems similar to this
HTML
<input id="colors" type="text" value="">
<select id="select-colors" name="" onchange="myFunction()">
<option disabled selected>Choose Colour</option>
<option value="green">green</option>
<option value="red">red</option>
<option value="orange">orange</option>
<option value="black">black</option>
</select>
JS
function myFunction() {
var x = document.getElementById("select-colors").value;
document.getElementById("colors").value = x;
}
This works by getting the value of the select with id "select-colors" on every change, assigning it into a variable "x" and inserting it into the input value with id "colors". This can be implemented in anyway based on your problem

You create functions with same name multiple times.
Only last one will work.
the variables you pass g,r,o,b are undefined.
Don't add onclick to option add onchange to select.
Make use of HTML5 data-* attribute
function myFunction(element) {
document.getElementById("myText").value = element;
}
First Name: <input type="text" id="myText" value="colors">
<select name="" onchange="myFunction(this.value);">
<option>Choose Database Type</option>
<option data-value="green">green</option>
<option data-value="red">red</option>
<option data-value="orange">orange</option>
<option data-value="black">black</option>
</select>

You can resolve it this way.
` First Name:
<select name="" onchange="myFunction()" id="selectID">
<option>Choose Database Type</option>
<option >green</option>
<option >red</option>
<option >orange</option>
<option >black</option>
</select>
<script>
function myFunction() {
var selectItem = document.getElementByID('selectID').value;
document.getElementByID('yourId').value = sekectItem;
}
</script>

Here's a way to achieve that:
var select = document.getElementById('colorName');
function myFunction(event) {
var color = 'No color selected';
if (select.selectedIndex > 0) {
color = select.item(select.selectedIndex).textContent;
}
document.getElementById('myText').value = color;
}
select.addEventListener('click', myFunction);
myFunction();
First Name: <input type="text" id="myText">
<select id="colorName">
<option>Choose Database Type</option>
<option>green</option>
<option>red</option>
<option>orange</option>
<option>black</option>
</select>

Your code should be like following.
<input type="text" name="color" id="color">
<select name="" id="change_color">
<option>Choose Database Type</option>
<option >green</option>
<option >red</option>
<option >orange</option>
<option >black</option>
</select>
<script type="text/javascript" src="jquery.js"></script>
<script>
$(document).ready(function () {
$('#change_color').change(function(){
var color = ($(this).val());
$('#color').val(color);
})
});
</script>

Here is JS Code that worked for me
var selectYear = document.getElementById('select-year');
selectYear.addEventListener('change', function() {
var selectedYear = document.getElementById('selected-year');
selectedYear.innerHTML = selectYear.value;
});
Select Input ID: select-year
Text ID: selected-year
Code generated from Codex AI :)

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