First question here so please go easy on me ! Trying to get this form select working but after hours still struggling. Code works fine when just one option has an id, but will not work with multiple id's. Have a feeling the right approach would be to assign each select option with a class but still can't figure it out.
Any assistance would be gratefully appreciated !
<form>
<p align="center">Size :
<input type="hidden" value="1" name="qty1" />
<select name="productpr1" id="getFname" onchange="showdiv(this);">
<option selected value="ERROR - Please select finish">please select</option>
<option id="show" value="product 1:5:0:105805">product 1</option>
<option id="" value="product 2:10:0:105205">product 2</option>
<option id="show" value="product 3:15:0:105605">product 3</option>
</select>
</p>
<div id="admDivCheck" style="display:none;text-align:center;">Choose delivery date</div>
<p><input type="submit" class="button" value="ADD TO BASKET" /></p>
</form>
<script>
function showdiv(nameSelect)
{
console.log(nameSelect);
if(nameSelect){
admOptionValue = document.getElementById("show").value;
if(admOptionValue == nameSelect.value){
document.getElementById("admDivCheck").style.display = "block";
}
else{
document.getElementById("admDivCheck").style.display = "none";
}
}
else{
document.getElementById("admDivCheck").style.display = "none";
}
}
</script>
Edit
Thanks for the assistance on here - the final version which works as I need :
<input type="hidden" value="1" name="qty1" />
<select name="productpr1" id="getFname" onchange="showdiv();">
<option selected value="ERROR - Please select finish">please select</option>
<option class="show" value="product 1:5:0:105805">product 1</option>
<option class="" value="product 2:10:0:105205">product 2</option>
<option class="show" value="product 3:15:0:105605">product 3</option>
</select>
<div id="admDivCheck" style="display:none">Choose delivery date</div>
<p><input type="submit" class="button" value="ADD TO BASKET" /></p>
<script>
function showdiv() {
var getFname= document.getElementById("getFname");
var askForDelivery = getFname.options[getFname.selectedIndex].classList;
if(askForDelivery.contains('show')){
document.getElementById('admDivCheck').style.display = 'block';
}
else{document.getElementById('admDivCheck').style.display = 'none';
}}
</script>
the id property is for the object document model and should be unique, just use 1,2,3 for it
In your script admOptionValue == nameSelect.value This value checking will always same, because selected option only the value of select tag.....
function showdiv(nameSelect)
{
console.log('choosed option',nameSelect.value);
if(nameSelect.value !="") document.getElementById("admDivCheck").style.display = "block";
else document.getElementById("admDivCheck").style.display = "none";
}
<form>
<p align="center">Size :
<input type="hidden" value="1" name="qty1" />
<select name="productpr1" id="getFname" onchange="showdiv(this);">
<option selected value="">please select</option>
<option value="product 1:5:0:105805">product 1</option>
<option value="product 2:10:0:105205">product 2</option>
<option value="product 3:15:0:105605">product 3</option>
</select>
</p>
<div id="admDivCheck" style="display:none;text-align:center;">Choose delivery date</div>
<p><input type="submit" class="button" value="ADD TO BASKET" /></p>
</form>
The reason that it is not working when having multiple id's is this line here:
admOptionValue = document.getElementById("show").value;
That is always going to return the first element with id show.
You should be able to get the selected value like this:
function showdiv() {
var getFname= document.getElementById("getFname");
var selectedValue = getFname.options[getFname.selectedIndex].value;
alert(selectedValue);
}
<select name="productpr1" id="getFname" onchange="showdiv();">
<option selected value="ERROR - Please select finish">please select</option>
<option value="product 1:5:0:105805">product 1</option>
<option value="product 2:10:0:105205">product 2</option>
<option value="product 3:15:0:105605">product 3</option>
</select>
So All I did was get the selectedIndex of the select box, rather than getting the individual option by id. All the options should have a unique id, and trying to get all of them would be a huge waste of time
EDIT
As mentioned earlier, you wanted to add a class to a specific item to determine if it should show or hide another div.
All you would do is check for classList instead of value to determine if it is true.
All you would have to do is get the classList of the selected item. If it contains the desired class, show your hidden div.
function showdiv() {
var getFname= document.getElementById("getFname");
var askForDelivery = getFname.options[getFname.selectedIndex].classList;
if(askForDelivery.contains('show')){
document.getElementById('admDivCheck').style.display = 'block';
}
}
I made a fiddle to demonstrate:
https://jsfiddle.net/k68nuams/
i'm using the code below to display an input field when "other" option is selected.
It works perfectly when "other" is selected.
However, i am unable to post to database when any other option apart from "other" is selected.
The problem is the text input negates the select options.
Any idea how to go about this?
There's a question that attempts to solve the problem but i don't have enough reputation to comment Stackoverflow.com/questions/9634783/how-to-activate-a-textbox-if-i-select-an-other-option-in-drop-down-box
<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>
the problem is, that you have multiple form elements with the same name. This might work in some cases, but generally is a bad practice. Name them differently and let the code that processes the input handle the data.
If you really need an input with the name 'color' that holds the current color, here is a solution that should work:
function checkColors(val) {
var element = document.getElementById('color');
if (val == 'pick a color' || val == 'others') {
element.style.display = 'block';
} else {
element.value = val; //make sure element always has the right value;
element.style.display = 'none';
}
}
<html>
<head>
</head>
<body>
<select name="colorSelect" 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>
I have a button that pass the value of input box to my select. The problem is when the value of my input box are didn't have in my select it show empty. But I want to show OTHERS if it's empty or shows the given value and put asterisk, e.g. POTATO* .
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="text" name="fruitname" id="fruitname" placeholder="Fruit Name"></input>
<button name="findfruit" id="findfruit" onclick="findfruit()">Find Fruit in Select</button>
<select name="fruitcontainer" id="fruitcontainer">
<option value="Apple">Apple</option>
<option value="Banana">Banana</option>
<option value="Coconut">Coconut</option>
<option value="Durian">Durian</option>
<option value="Others">Others</option>
</select>
</body>
</html>
<script type="text/javascript">
function findfruit(){
document.getElementById('fruitcontainer').value = document.getElementById('fruitname').value;
}
</script>
Test if the text input one of the possible values of the <select>.
function findfruit() {
var value = document.getElementById('fruitname').value;
if (value == '') {
value = "Others";
} else if (!document.querySelector("#fruitcontainer option[value='" + value + "']")) {
value += '*';
var newOption = document.createElement('option');
newOption.value = value;
newOption.textContent = value;
document.getElementById('fruitcontainer').appendChild(newOption);
}
document.getElementById('fruitcontainer').value = value;
}
<input type="text" name="fruitname" id="fruitname" placeholder="Fruit Name"></input>
<button name="findfruit" id="findfruit" onclick="findfruit()">Find Fruit in Select</button>
<select name="fruitcontainer" id="fruitcontainer">
<option value="Apple">Apple</option>
<option value="Banana">Banana</option>
<option value="Coconut">Coconut</option>
<option value="Durian">Durian</option>
<option value="Others">Others</option>
</select>
I need to alert if you haven't selected anything and couldn't get it to work. It needs to show what is where wrong and alert with a window.
<!DOCTYPE html>
<html>
<head>
<select id="ddlView">
<option value="0">Select</option>
<option value="1">test1</option>
<option value="2">test2</option>
<option value="3">test3</option>
</select>
<input type="button" onclick="myFunction()" value="select" />
<script>
function Validate()
{
var e = document.getElementById("ddlView");
var strUser = e.options[e.selectedIndex].value;
var strUser1 = e.options[e.selectedIndex].text;
if(strUser==0)
{
alert("Please select a user");
}
}
</td></head>
</html>
I think you have multiple problems here.
You need to add a body tag
Set the correct function name in your button.
you need a closing script tag
Give this a try:
<!DOCTYPE html>
<html>
<body>
<select id="ddlView">
<option value="0">Select</option>
<option value="1">test1</option>
<option value="2">test2</option>
<option value="3">test3</option>
</select>
<input type="button" onclick="Validate()" value="select" />
<script type="text/javascript">
function Validate()
{
var e = document.getElementById("ddlView");
var strUser = e.options[e.selectedIndex].value;
var strUser1 = e.options[e.selectedIndex].text;
if(strUser==0)
{
alert("Please select a user");
}
}
</script>
</body>
</html>
This is not you asked for but you can still consider what i did.
Have an option with value 0 which is going to be the default option of the dropdown and add required attribute to the select element.
Once this select element is in a form and is submitted ,HTML is automatically going to take over the validation part.
<select required>
<option value="">Select</option>
<option value="1">Option1</option>
</select>
<body>
<div>
<span>Select the course : </span>
<select id="ddlView">
<option value="0">Select</option>
<option value="1">Java Script</option>
<option value="2">CSS</option>
<option value="3">JQuery</option>
<option value="3">HTML</option>
<option value="3">C#</option>
</select>
</div>
<br >
<input type="button" class="btn" value="Submit" id="btnSubmit" onclick="ddlValidate();" />
<script type="text/javascript">
function ddlValidate() {
var e = document.getElementById("ddlView");
var optionSelIndex = e.options[e.selectedIndex].value;
var optionSelectedText = e.options[e.selectedIndex].text;
if (optionSelIndex == 0) {
alert("Please select a Course");
}
else {
alert("Success !! You have selected Course : " + optionSelectedText); ;
}
}
</script>
That has to be in your form processing script, you can just add it to the top of your code and check if it has been submitted.
// Place this atop of your script.
if(isset($_POST)) {
if($_POST['member_id']) {
// Your codes here
}
}
call this function at a button click(OnClientClick=" return Validate()") you have to list an item for the 0'th positions(ddlView.Items.Insert(0, new ListItem("Select...", "0"));)
function Validate(){
var region = document.getElementById('<%=ddlView.ClientID%>').value;
if (region == 0) {
alert("Please select a user");
return false;
}
}
How to use onClick() or onSelect() with option tag? Below is my code in which I tried to implement that, but it is not working as expected.
Note: where listCustomer domain object list getting in JSP page.
<td align="right">
<select name="singleSelect" ">
<c:forEach var="Customer" items="${listCustomer}" >
<option value="" onClick="javascript:onSelect(this);> <c:out value="${Customer}" /></option>
</c:forEach>
</select>
</td>
How do I modify it to detect that an option is selected?
Neither the onSelect() nor onClick() events are supported by the <option> tag. The former refers to selecting text (i.e. by clicking + dragging across a text field) so can only be used with the <text> and <textarea> tags. The onClick() event can be used with <select> tags - however, you probably are looking for functionality where it would be best to use the onChange() event, not onClick().
Furthermore, by the look of your <c:...> tags, you are also trying to use JSP syntax in a plain HTML document. That's just... incorrect.
In response to your comment to this answer - I can barely understand it. However, it sounds like what you want to do is get the value of the <option> tag that the user has just selected whenever they select one. In that case, you want to have something like:
<html>
<head>
<script type="text/javascript">
function changeFunc() {
var selectBox = document.getElementById("selectBox");
var selectedValue = selectBox.options[selectBox.selectedIndex].value;
alert(selectedValue);
}
</script>
</head>
<body>
<select id="selectBox" onchange="changeFunc();">
<option value="1">Option #1</option>
<option value="2">Option #2</option>
</select>
</body>
</html>
Even more simplified: You can pass the value attribute directly!
<html>
<head>
<script type="text/javascript">
function changeFunc(i) {
alert(i);
}
</script>
</head>
<body>
<select id="selectBox" onchange="changeFunc(value);">
<option value="1">Option #1</option>
<option value="2">Option #2</option>
</select>
</body>
</html>
The alert will either return 1 or 2.
The answer you gave above works but it is confusing because you have used two names twice and you have an unnecessary line of code. you are doing a process that is not necessary.
it's a good idea when debugging code to get pen and paper and draw little boxes to represent memory spaces (i.e variables being stored) and then to draw arrows to indicate when a variable goes into a little box and when it comes out, if it gets overwritten or is a copy made etc.
if you do this with the code below you will see that
var selectBox = document.getElementById("selectBox");
gets put in a box and stays there you don't do anything with it afterwards.
and
var selectBox = document.getElementById("selectBox");
is hard to debug and is confusing when you have a select id of selectBox for the options list . ---- which selectBox do you want to manipulate / query / etc is it the local var selectBox that will disappear or is it the selectBox id you have assigned to the select tag
your code works until you add to it or modify it then you can easily loose track and get all mixed up
<html>
<head>
<script type="text/javascript">
function changeFunc() {
var selectBox = document.getElementById("selectBox");
var selectedValue = selectBox.options[selectBox.selectedIndex].value;
alert(selectedValue);
}
</script>
</head>
<body>
<select id="selectBox" onchange="changeFunc();">
<option value="1">Option #1</option>
<option value="2">Option #2</option>
</select>
</body>
</html>
a leaner way that works also is:
<html>
<head>
<script type="text/javascript">
function changeFunc() {
var selectedValue = selectBox.options[selectBox.selectedIndex].value;
alert(selectedValue);
}
</script>
</head>
<body>
<select id="selectBox" onchange="changeFunc();">
<option value="1">Option #1</option>
<option value="2">Option #2</option>
</select>
</body>
</html>
and it's a good idea to use descriptive names that match the program and task you are working on am currently writing a similar program to accept and process postcodes using your code and modifying it with descriptive names the object is to make computer language as close to natural language as possible.
<script type="text/javascript">
function Mapit(){
var actualPostcode=getPostcodes.options[getPostcodes.selectedIndex].value;
alert(actualPostcode);
// alert is for debugging only next we go on to process and do something
// in this developing program it will placing markers on a map
}
</script>
<select id="getPostcodes" onchange="Mapit();">
<option>London North Inner</option>
<option>N1</option>
<option>London North Outer</option>
<option>N2</option>
<option>N3</option>
<option>N4</option>
// a lot more options follow
// with text in options to divide into areas and nothing will happen
// if visitor clicks on the text function Mapit() will ignore
// all clicks on the divider text inserted into option boxes
</select>
in this example de select tag is named as: aula_clase_cb
<select class="form-control" id="aula_clase_cb" >
</select>
document.getElementById("aula_clase_cb").onchange = function(e){
id = document.getElementById('aula_clase_cb').value;
alert("id: "+id);
};
<div class="form-group">
<script type="text/javascript">
function activa(){
if(v==0)
document.formulario.vr_negativo.disabled = true;
else if(v==1)
document.formulario.vr_negativo.disabled = true;
else if(v==2)
document.formulario.vr_negativo.disabled = true;
else if(v==3)
document.formulario.vr_negativo.disabled = true;
else if(v==4)
document.formulario.vr_negativo.disabled = true;
else if(v==5)
document.formulario.vr_negativo.disabled = true;
else if(v==6)
document.formulario.vr_negativo.disabled = false;}
</script>
<label>¿Qué tipo de vehículo está buscando?</label>
<form name="formulario" id="formulario">
<select name="lista" id="lista" onclick="activa(this.value)">
<option value="0">Vehiculo para la familia</option>
<option value="1">Vehiculo para el trabajo</option>
<option value="2">Camioneta Familiar</option>
<option value="3">Camioneta de Carga</option>
<option value="4">Vehiculo servicio Publico</option>
<option value="5">Vehiculo servicio Privado</option>
<option value="6">Otro</option>
</select>
<br />
<input type="text" id="form vr_negativo" class="form-control input-xlarge" name="vr_negativo"/>
</form>
</div>
You can change selection in the function
window.onload = function () {
var selectBox = document.getElementById("selectBox");
selectBox.addEventListener('change', changeFunc);
function changeFunc() {
alert(this.value);
}
}
<!DOCTYPE html>
<html>
<head>
<title>Selection</title>
</head>
<body>
<select id="selectBox" onChange="changeFunc();">
<option> select</option>
<option value="1">Option #1</option>
<option value="2">Option #2</option>
</select>
</body>
</html>
<html>
<head>
<title>Cars</title>
</head>
<body >
<h1>Cars</h1>
<p>Name </p>
<select id="selectBox" onchange="myFunction(value);">
<option value="volvo" >Volvo</option>
<option value="saab" >Saab</option>
<option value="mercedes">Mercedes</option>
</select>
<p id="result"> Price : </p>
<script>
function myFunction($value)
{
if($value=="volvo")
{document.getElementById("result").innerHTML = "30L";}
else if($value=="saab")
{document.getElementById("result").innerHTML = "40L";}
else if($value=="mercedes")
{document.getElementById("result").innerHTML = "50L";}
}
</script>
</body>
</html>```
Other option, for similar example but with anidated selects, think that you have two select, the name of the first is "ea_pub_dest" and the name of the second is "ea_pub_dest_2", ok, now take the event click of the first and display the second.
<script>
function test()
{
value = document.getElementById("ea_pub_dest").value;
if ( valor == "value_1" )
document.getElementById("ea_pub_dest_nivel").style.display = "block";
}
</script>
Change onClick() from with onChange() in the . You can send the option value to a javascript function.
<select id="selector" onChange="doSomething(document.getElementById(this).options[document.getElementById(this).selectedIndex].value);">
<option value="option1"> Option1 </option>
<option value="option2"> Option2 </option>
<option value="optionN"> OptionN </option>
</select>
If you need to change the value of another field, you can use this:
<input type="hidden" id="mainvalue" name="mainvalue" value="0">
<select onChange="document.getElementById('mainvalue').value = this.value;">
<option value="0">option 1</option>
<option value="1">option 2</option>
</select>
example dom onchange usage:
<select name="app_id" onchange="onAppSelection(this);">
<option name="1" value="1">space.ecoins.beta.v3</option>
<option name="2" value="2">fun.rotator.beta.v1</option>
<option name="3" value="3">fun.impactor.beta.v1</option>
<option name="4" value="4">fun.colorotator.beta.v1</option>
<option name="5" value="5">fun.rotator.v1</option>
<option name="6" value="6">fun.impactor.v1</option>
<option name="7" value="7">fun.colorotator.v1</option>
<option name="8" value="8">fun.deluxetor.v1</option>
<option name="9" value="9">fun.winterotator.v1</option>
<option name="10" value="10">fun.eastertor.v1</option>
<option name="11" value="11">info.locatizator.v3</option>
<option name="12" value="12">market.apks.ecoins.v2</option>
<option name="13" value="13">fun.ecoins.v1b</option>
<option name="14" value="14">place.sin.v2b</option>
<option name="15" value="15">cool.poczta.v1b</option>
<option name="16" value="16" id="app_id" selected="">systems.ecoins.launch.v1b</option>
<option name="17" value="17">fun.eastertor.v2</option>
<option name="18" value="18">space.ecoins.v4b</option>
<option name="19" value="19">services.devcode.v1b</option>
<option name="20" value="20">space.bonoloto.v1b</option>
<option name="21" value="21">software.devcode.vpnfree.uk.v1</option>
<option name="22" value="22">software.devcode.smsfree.v1b</option>
<option name="23" value="23">services.devcode.smsfree.v1b</option>
<option name="24" value="24">services.devcode.smsfree.v1</option>
<option name="25" value="25">software.devcode.smsfree.v1</option>
<option name="26" value="26">software.devcode.vpnfree.v1b</option>
<option name="27" value="27">software.devcode.vpnfree.v1</option>
<option name="28" value="28">software.devcode.locatizator.v1</option>
<option name="29" value="29">software.devcode.netinfo.v1b</option>
<option name="-1" value="-1">none</option>
</select>
<script type="text/javascript">
function onAppSelection(selectBox) {
// clear selection
for(var i=0;i<=selectBox.length;i++) {
var selectedNode = selectBox.options[i];
if(selectedNode!=null) {
selectedNode.removeAttribute("id");
selectedNode.removeAttribute("selected");
}
}
// assign id and selected
var selectedNode = selectBox.options[selectBox.selectedIndex];
if(selectedNode!=null) {
selectedNode.setAttribute("id","app_id");
selectedNode.setAttribute("selected","");
}
}
</script>
In my case:
<html>
<head>
<script type="text/javascript">
function changeFunction(val) {
//Show option value
console.log(val.value);
}
</script>
</head>
<body>
<select id="selectBox" onchange="changeFunction(this)">
<option value="1">Option #1</option>
<option value="2">Option #2</option>
</select>
</body>
</html>
focus clears value, so select any value is a change and fires myFunc(this) and blur defocus for reselect
<html>
<head>
<script type="text/javascript">
function myFunc(el) {
//Show option value
console.log(el.value);
}
</script>
</head>
<body>
<select id="selectBox" onchange="myFunc(this);this.blur();" onfocus="this.selectedIndex = -1;">
<option value="1">Option #1</option>
<option value="2">Option #2</option>
</select>
</body>
</html>