onchange javascript and adding elements

onchange javascript and adding elements - javascript

I am having an issue with javascript while trying to add a textfield to my form with "onchange", this is the code:
<!DOCTYPE html>
<html>
<body>
<form id="formdemo">
</form>
<p>Select a new car from the list.</p>
<select id="mySelect" onchange="myFunction()">
<option value="Volvo">33
<option value="1">1
<option value="Audi">Audi
<option value="BMW">BMW
<option value="Mercedes">Mercedes
<option value="Volvo">Volvo
</select>
<script>
function myFunction() {
if (document.getElementById("mySelect").value == "1") {
document.getElementById("formdemo").innerHTML = " First name: <input type = "text" name ="firstname">"
}
}
</script>
</body>
</html>
As you can see, I want to generate a text field when the user chose "1", but The problem is that when I choose the "1" value the text field does not appear.
But when I remove the "input type" code from javascript, code looks like this:
<script>
function myFunction() {
if (document.getElementById("mySelect").value == "1") {
document.getElementById("formdemo").innerHTML = " First name:"
}
}
</script>
It works!!, it shows the "First name:" to site.
Is this method that I am using just for strings or just for adding paragraphs and I should use another method to add forms, or I am using wrong syntax?
Thank you for reading this, have a good day.

Your code is fine, just in the innterHTML your have a little mistake.
document.getElementById("formdemo").innerHTML = " First name: <input type = "text" name ="firstname">"
and should be like
document.getElementById("formdemo").innerHTML = " First name: <input type='text' name='firstname'>"

You're wrong in String input :
<form id="formdemo">
</form>
<p>Select a new car from the list.</p>
<script>
function myFunction() {
if (document.getElementById("mySelect").value == "1") {
document.getElementById("formdemo").innerHTML =
"First name: <input type=\"text\" name=\"firstname\">";
}
}
</script>
<select id="mySelect" onchange="myFunction()">
<option value="Volvo">33</option>
<option value="1">1</option>
<option value="Audi">Audi</option>
<option value="BMW">BMW</option>
<option value="Mercedes">Mercedes</option>
<option value="Volvo">Volvo</option>
</select>
the input should be like "First name: <input type=\"text\" name=\"firstname\">";
here is a fiddle :> Fiddle

You can try like this way
var input = document.createElement("textarea");
div.appendChild(input);

Related

How to change select's option based on a selected option's value?

I have select tag below:
<select name="selID" id="selID" data-mini="true"">
<option value="1" selected="selected">Tithes</option>
<option value="2">Offering</option>
<option value="3">Designated</option>
<option class="selOptAddMore" value="0">Add More...</option>
</select>
I want to change value when one of the options is selected except for "Add More..."
Sorry I'm a newbie. Thanks in advance.

You can try this:
The HTML:
<body>
Result: <p id="result"></p>
<select name="selID" id="selID" data-mini="true" onchange="test()">
<option value="1" selected="selected">Tithes</option>
<option value="2">Offering</option>
<option value="3">Designated</option>
<option class="selOptAddMore" value="0">Add More...</option>
</select>
<script src="test.js"></script>
</body>
test.js:
function test() {
let listVal = document.getElementById("selID").value;
if (listVal != "0") {
document.getElementById("result").innerHTML = listVal;
}
else {
listVal = 1; // this is value for "Tithes"
document.getElementById("selID").value = listVal;
document.getElementById("result").innerHTML = listVal;
}
}

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 :)

How to change the Input Name based on the dropdown selection in html form?

I have a HTML form which changes its form action based on the drop down selection but input name remains same.
Here is my HTML:
<form action="car.php" method="GET">
Select Your Option :
<select onChange="this.form.action=this.options[this.selectedIndex].value;">
<option value='car.php'>Car Name</option>
<option value='bike.php'>Bike Name</option>
<option value='laptop.php'>Laptop Name</option>
<option value='place.php'>Place Name</option>
<option value='mobile.php'>Mobile Name</option>
</select>
Enter your query // I want to change this also
<input id="Value" name="Value" type="text">
<button id="submit" type="submit" value="Submit">Submit Query</button>
If I select Car Name and enter Maruti then value is passed like this:
http://www.mywebsite.com/car.php?Value=Maruti
If I select Bike Name and enter Honda then value is passed like this :
http://www.mywebsite.com/bike.php?Value=Honda
My problem is I have to name the column as "Value" in all the 5 database which stores all the information regarding all this, which I want to avoid.
I want, If I select Car Name and enter Maruti then value should pass like this
http://www.mywebsite.com/car.php?car=Maruti
If I select Bike Name and enter Honda then value should pass like this
http://www.mywebsite.com/bike.php?bike=Honda
What changes should be made in the code to achieve this goal?
If this can also happen then its very nice otherwise no problem.
In the form it is written Enter your query. I want the same change to happen here. If I select Car Name then it should be Enter you car. If I select Bike Name then it should be Enter your bike... and so on.
UPDATE
Little modification I need. When selecting car, the input name is changing to car, the form action is changing to car.php and query to Enter your car. But If I want to change the name like this then what should I do? When I will select anything say bike then form action will be changed to bike.php, But I want input name to be different say USY and Enter your bike to Enter your Serial No. What should I do ?

I have updated the code now and got ur exact requirement now and i hope this will help you
<script type="text/javascript" src="http://code.jquery.com/jquery-1.11.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("select").change(function(){
var str=$(this).val(); // On Change get the option value
$("form").attr("action",str);
var res=str.split(".");
$("#input1").attr("name",res[0]);
$(".title").html("Enter your "+res[0]+" Name."); // Add this below $("input").attr("name",res[0]);
if(res[0]=='bike')
{
var title2="XYZ";
var title3="Serial No";
}
else if(res[0]=='laptop')
{
var title2="ABC";
var title3="Model No";
}
else if(res[0]=='place')
{
var title2="KLM";
var title3="Area";
}
else if(res[0]=='mobile')
{
var title2="FGH";
var title3="Brand";
}
$("#input2").attr("name",title2);
$("#input3").attr("name",title3);
$(".title2").html("Enter your "+title3);
});
});
</script>
<form action="car.php" method="GET">
Select Your Option :
<select value="car.php">
<option value='car.php'>Car Name</option>
<option value='bike.php'>Bike Name</option>
<option value='laptop.php'>Laptop Name</option>
<option value='place.php'>Place Name</option>
<option value='mobile.php'>Mobile Name</option>
</select>
<span class="title2">Enter your Color</span>
<input name="WER" id="input2" type="text">
<button id="submit" type="submit" value="Submit">Submit Query</button>
</form>

I advise you to not use JavaScript embedded into HTML attributes. Other than that, you can change the name attribute in the same change handler where you're modifying the action.
document.getElementById('Type').addEventListener('change', function(evt) {
var type = this.selectedOptions[0].value;
console.dir(this);
document.getElementById('Value').setAttribute('name', type);
document.getElementById('QueryName').textContent = type;
this.form.action = type + ".php";
});
<form action="car.php" method="GET">
Select Your Option :
<select id="Type">
<option value='car' selected>Car Name</option>
<option value='bike'>Bike Name</option>
<option value='laptop'>Laptop Name</option>
<option value='place'>Place Name</option>
<option value='mobile'>Mobile Name</option>
</select>
Enter your <span id="QueryName">car</span>
<input id="Value" name="car" type="text">
<button id="submit" type="submit" value="Submit">Submit Query</button>
EDIT: If you want everything to be different as said in comments, you can use an object to hold the values. For example,
var setup = {
car: {
action: 'mycar.php',
param: 'DFS',
query: 'color'
},
...
};
and then instead of directly using the option's value, pull from this object based on the selected option.

<script type="text/javascript" src="http://code.jquery.com/jquery-1.11.2.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$("select").change(function(){
var str=$(this).val(); // On Change get the option value
$("form").attr("action",str);
var res=str.split(".");
$("input").attr("name",res[0]);
});
});
</script>
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<form action="car.php" method="GET">
Select Your Option :
<select value="car.php">
<option value='car.php'>Car Name</option>
<option value='bike.php'>Bike Name</option>
<option value='laptop.php'>Laptop Name</option>
<option value='place.php'>Place Name</option>
<option value='mobile.php'>Mobile Name</option>
</select>
Enter your query // I want to change this also
<input id="Value" name="car" type="text">
<button id="submit" type="submit" value="Submit">Submit Query</button>
</form>
</html>
I have used jquery here some few changes in html try it out this one
<form action="car.php" method="GET">
Select Your Option :
<select value="car.php">
<option value='car.php'>Car Name</option>
<option value='bike.php'>Bike Name</option>
<option value='laptop.php'>Laptop Name</option>
<option value='place.php'>Place Name</option>
<option value='mobile.php'>Mobile Name</option>
</select>
Enter your query // I want to change this also
<input id="Value" name="car" type="text">
<button id="submit" type="submit" value="Submit">Submit Query</button>
</form>
And for Jquery you can use this one
<script type="text/javascript">
$(document).ready(function(){
$("select").change(function(){
var str=$(this).val(); // On Change get the option value
$("form").attr("action",str);
var res=str.split(".");
$("input").attr("name",res[0]);
});
});
</script>
This works perfectly for me Enjoy :)

how to activate a textbox if I select an other option in drop down box

suppose I've a 3 options in a drop down box say red , blue, others.
If a user select option as an others then below a text box should be visible to wrtie his own favourite color.
I can populate the drop down box with colors but do not know how to bring textbox visible on selection of others in the
drop-down box. I know that using javascript it is possible to do but I am quite new to javascript. can anybody please help me
out??
This is the select option I am implementing in my html form
<select name="color"> // color
<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" /></td> // this textbox should be hidden //until unless others is selected in the drop down box

Below is the core JavaScript you need to write:
<html>
<head>
<script type="text/javascript">
function CheckColors(val){
var element=document.getElementById('color');
if(val=='pick a color'||val=='others')
element.style.display='block';
else
element.style.display='none';
}
</script>
</head>
<body>
<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" style='display:none;'/>
</body>
</html>

Coded an example at http://jsbin.com/orisuv
HTML
<select name="color" onchange='checkvalue(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" style='display:none'/>
Javascript
function checkvalue(val)
{
if(val==="others")
document.getElementById('color').style.display='block';
else
document.getElementById('color').style.display='none';
}

Inline:
<select
onchange="var val = this.options[this.selectedIndex].value;
this.form.color[1].style.display=(val=='others')?'block':'none'">
I used to do this
In the head (give the select an ID):
window.onload=function() {
var sel = document.getElementById('color');
sel.onchange=function() {
var val = this.options[this.selectedIndex].value;
if (val == 'others') {
var newOption = prompt('Your own color','');
if (newOption) {
this.options[this.options.length-1].text = newOption;
this.options[this.options.length-1].value = newOption;
this.options[this.options.length] = new Option('other','other');
}
}
}
}

As Umesh Patil answer have comment say that there is problem.
I try to edit answer and get reject. And get suggest to post new answer.
This code should solve problem they have (Shashi Roy, Gaven, John Higgins).
<html>
<head>
<script type="text/javascript">
function CheckColors(val){
var element=document.getElementById('othercolor');
if(val=='others')
element.style.display='block';
else
element.style.display='none';
}
</script>
</head>
<body>
<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="othercolor" style='display:none;'/>
</body>
</html>

Simply
<select id = 'color2'
name = 'color'
onchange = "if ($('#color2').val() == 'others') {
$('#color').show();
} else {
$('#color').hide();
}">
<option value="red">RED</option>
<option value="blue">BLUE</option>
<option value="others">others</option>
</select>
<input type = 'text'
name = 'color'
id = 'color' />
edit: requires JQuery plugin

This will submit the right form response (i.e. Select value most of the time, and Input value when the Select box is set to "others"). Uses jQuery:
$("select[name="color"]").change(function(){
new_value = $(this).val();
if (new_value == "others") {
$('input[name="color"]').show();
} else {
$('input[name="color"]').val(new_value);
$('input[name="color"]').hide();
}
});

JavaScript Populating an input Field Using an Html combo Box

i am trying to find a way to allow a user to click items in a combo box and have its value populate an input field and also alert "work stop" or "work start" message when appropriate option is selected. But my code is not working. Please Help!
Here is my code:
<html>
<head>
</head>
<body>
<form>
<select name="sel1" onChange="populateField(this.form)" >
<option value="">---Select---</option>
<option value="stop" >Stop</option>
<option value="start">Start</option>
</select>
<input type="text" id="eStop" name="eStop" />
</form>
<script type="text/javascript">
function populateField(frm){
test = frm.stop.value;
alert('work' test);
frm.eStop.value = test;
}
</script>
</body>
</html>
Thanks in Advance

http://jsfiddle.net/snHQY/
<form>
<select name="sel1" id="select" onchange="populateField();" >
<option value="">---Select---</option>
<option name="stop" value="stop" >Stop</option>
<option name="start" value="start">Start</option>
</select>
<input type="text" id="eStop" name="eStop" />
</form>
<script>
function populateField() {
test = document.getElementById('select').value;
alert(test);
document.getElementById('eStop').value = test;
}
</script>

You can do it using the selectedIndex if you want as well,
<form>
<select name="sel1" id="select" onchange="populateField(this);" >
<option value="">---Select---</option>
<option name="stop" value="stop" >Stop</option>
<option name="start" value="start">Start</option>
</select>
<input type="text" id="eStop" name="eStop" />
</form>
<script>
function populateField(sel) {
sel.form.eStop.value = 'work ' + (sel.selectedIndex == 1 ? 'Stop' : 'Start');
}
</script>
http://jsfiddle.net/cnpuM/

Your code has two errors. You can not reference an element by its value like this test = frm.stop.value; instead use test = frm.sel1.value; . Another error is in this line alert('work' test);. Here you are joining a string "work" with a variable "test". In java script where ever you join two or more variables or strings and variables you alway have to join them with + sign like this:alert('work ' + test);. Remaining code is ok:
<html>
<head>
</head>
<body>
<form>
<select name="sel1" onChange="populateField(this.form)" >
<option value="">---Select---</option>
<option value="stop" >Stop</option>
<option value="start">Start</option>
</select>
<input type="text" id="eStop" name="eStop" />
</form>
<script type="text/javascript">
function populateField(frm){
var test = frm.sel1.value;
alert('work '+ test);
frm.eStop.value = test;
}
</script>
</body>
</html>
You can also use selectedIndex property of "sel1" to do the same.

in your select you can add to onchange's and onkeypress to the populateField's function this as the objects reference.
<select name="sel1" onchange="populateField(this)" onkeypress="populateField(this)">
Now you can reference the select from o. to pass the selected value to the alert dialog and the input field.
function populateField(o){
alert("work " + o.value);
// use regular W3C DOM syntax for element referencing the input and populate it with the select objects selected options value
document.getElementById("eStop").value = o.value;
}

Develop Reference

JavaScript is the programming language of the Web.

onchange javascript and adding elements - javascript

Your code is fine, just in the innterHTML your have a little mistake. document.getElementById("formdemo").innerHTML = " First name: <input type = "text" name ="firstname">" and should be like document.getElementById("formdemo").innerHTML = " First name: <input type='text' name='firstname'>"

You can try like this way var input = document.createElement("textarea"); div.appendChild(input);

Related

How to change select's option based on a selected option's value?

Javascript change input value when select option is selected

How to change the Input Name based on the dropdown selection in html form?

how to activate a textbox if I select an other option in drop down box

JavaScript Populating an input Field Using an Html combo Box

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