I have a HTML form in my script with some drop-down lists. For example:
<select name="1">
<option value="a">a</option>
<option value="b">b</option>
<option value="c">c</option>
</select>
<select name="2">
<option value="a">a</option>
<option value="b">b</option>
<option value="c">c</option>
</select>
As you can see, the options in the both lists are identical. What I should do, to stop the user selecting the same option? For example, if the user selects option "b" from list "1", and then tries to select option "b" from list "2", I want the selected option from list "1" to disappear, so the user can't submit the same values...
Sorry for my english. I hope I made myself clear...
You can validate the form to do this.
Tested Working Code:
<html>
<head>
<script>
//put this javascript function in the header. this validates the from one you click the submit button
function validateForm() {
var x = document.forms["myForm"]["box1"].value;//this is the selection of dropdown box 1
var y = document.forms["myForm"]["box2"].value;//this is the selection of dropdown box 2
if (x == y) {//use the if statement to check if the selection are the same
alert("Selection Cannot Be the Same");//error message
return false;
}
}
</script>
</head>
<body>
<form name="myForm" action=""
onsubmit="return validateForm()" method="">
<!--onsubmit calls the function once the submit button is clicked-->
<select name="box1">
<option value="a">a</option>
<option value="b">b</option>
<option value="c">c</option>
</select>
<select name="box2">
<option value="a">a</option>
<option value="b">b</option>
<option value="c">c</option>
</select>
<input type="submit" value="Submit">
</form>
</body>
</html>
You could submit the form when one list option is selected and redisplay with the reduced list of options.
Related
I have a drop-down list which POSTs to express and then redirects to same page.
Now, I want the one valid option to be selected before submitting, hence I added required property in <select> tag.
But, I also want a value to be Selected in the list when page renders
If first time render, then first option
If after submitting, the submitted option to be selected by default
Here is the skeleton code
<select required data-style="btn-info" name="selectpicker">
<optgroup label="Select Map">
<option name="table1" value="Station">Station</option>
<option name="table2" value="Station2">Station2</option>
</optgroup>
</select>
and the things I tried
<option value="" selected disabled>Select station</option>
<option name="table1" value="Station" selected>Station</option>
but none of them fulfills my requirements.
if you are using javascript for handling the form just add event.preventDefault() in your onsubmit function so when you submit it won't revert back to default
The problems were solved by
<form action="any" method="any" onSubmit="return fieldCheck();">
<select required id="collec" data-style="btn-info" name="selectpicker">
<option value="Select Station" selected disabled hidden>Select City</option>
<option name="table1" value="Vice City">Vice City</option>
<option name="table2" value="Delhi City">Delhi City</option>
and script
function fieldCheck() {
var collec = document.querySelector('#collec');
if(collec.value != "Select Station") {
return true;
}
else {
alert("Select a city first!!");
return false;
}
}
I have a html form which has a dropdown consisting of a few values. If the user does not select an option and moves to the next field, I need to give an error message. I have used the required attribute but it does not fire in Chrome and Firefox.
This is my code :
<select name="gender" id="gender" style="max-width:100%" required>
<option value="">Select Gender</option>
<option value="Male">Male</option>
<option value="Female">Female</option>
<option value="Other">Other</option>
</select>
The required attribute does not work on Chrome and Firefox. A JavaScript solution would also be good. At the time of submitting the data I am checking for empty fields but I would like to display an error message if the user does not select a value from the dropdown and moves to the next field.
Use below code, not need any script, use form tag
<!DOCTYPE html>
<html>
<body>
<form>
<select required>
<option value="">None</option>
<option value="demo">demo</option>
<option value="demo1">demo1</option>
<option value="demo2">demo2</option>
<option value="demo3">demo3</option>
</select>
<input type="submit">
</form>
</body>
</html>
Try using the onfocusout option on your select paired with some Javascript.
HTML
<select name="gender" id="gender" onfocusout="check()" style="max-width:100%" required>
<option value="">Select Gender</option>
<option value="Male">Male</option>
<option value="Female">Female</option>
<option value="Other">Other</option>
</select>
JS
function check(){
var x = document.getElementById("gender").selectedOptions[0].label;
if(x == "Select Gender"){
alert("Please select an option.");
}
}
CodePen.io: https://codepen.io/anon/pen/XQxQgw
There's undoubtedly a more efficient way of doing this and you would need to tweak the JS to check if all fields have been completed etc. but that's my two cents in a pinch!
I have a form in which I have added "Please Select" option for the drop-down.
The form should work in a way that if users doesn't select values 1, 2-5, 6-15, 16-30 etc then the form should not submit.
In my form, if I select "Please Select" then the form gets submit as it being treated as 1, 2-5, 6-15, 16-30, etc.
The HTML codes for the form generated at run time are:
<select name="input_12" id="input_37_12" class="medium gfield_select" tabindex="5" aria-required="true" aria-invalid="false">
<option value="Please Select" selected="selected">Please Select</option>
<option value="1">1</option>
<option value="2-5">2-5</option>
<option value="6-15">6-15</option>
<option value="16-30">16-30</option>
<option value="31-100">31-100</option>
<option value="101-250">101-250</option>
<option value="251-1000">251-1000</option>
<option value="1001-2500">1001-2500</option>
<option value="2501 +">2501 +</option>
</select>
Problem Statement:
I am wondering what changes I should make in the HTML code above so that "Please Select" option is not treated as other drop-down values (1, 2-5, 6-15, 16-30 etc ) in the HTML.
To force form validation on a select input, you need to use the required attribute on your select form and set the value of the initial option to "".
Note: aria-required="true" works fine as well, especially for browsers that don't yet support HTML5, I just prefer the shorter HTML5 alternative. This also applies to selected="selected" vs selected.
<form>
<select name="input_12" id="input_37_12" class="medium gfield_select" tabindex="5" required aria-invalid="false">
<option value="" selected>Please Select</option>
<option value="1">1</option>
<option value="2-5">2-5</option>
<option value="6-15">6-15</option>
<option value="16-30">16-30</option>
<option value="31-100">31-100</option>
<option value="101-250">101-250</option>
<option value="251-1000">251-1000</option>
<option value="1001-2500">1001-2500</option>
<option value="2501 +">2501 +</option>
</select>
<button type="submit">Submit</button>
</form>
Edit: This can also be done via Javascript.
// Obtain our form via its ID
var form = document.querySelector('form');
// Add a listener to our form to wait for its submission
if (form.addEventListener) {
form.addEventListener("submit", validate, false); //Modern browsers
} else if (form.attachEvent) {
form.attachEvent('onsubmit', validate); //Old IE
}
function validate(e) {
var select = e.target.querySelector("select");
// Get the value of our selected option
var selectedOption = select.options[select.selectedIndex].value;
// Compare the value of the default option to the selected option
if (selectedOption === "Please Select") {
// Trigger Error and prevent the form submission
alert("Please select an option!")
e.preventDefault();
}
}
<form>
<select name="input_12" id="input_37_12" class="medium gfield_select" tabindex="5" aria-required="true" aria-invalid="false">
<option value="Please Select" selected="selected">Please Select</option>
<option value="1">1</option>
<option value="2-5">2-5</option>
<option value="6-15">6-15</option>
<option value="16-30">16-30</option>
<option value="31-100">31-100</option>
<option value="101-250">101-250</option>
<option value="251-1000">251-1000</option>
<option value="1001-2500">1001-2500</option>
<option value="2501 +">2501 +</option>
</select>
<button type="submit">Button</button>
</form>
To simply prevent the users from selecting an option just add disabled in the html for the option (as pointed out in the question from the comment marking this as a possible duplicate, #csmckelvey).
However, you can also simply add a display:none to the option:
select option:first-of-type{
display:none;
}
At least works on android, and yet show the text of the first option (even though it Should be hidden - dont Know why).
Anyways it's important to Remember to validate the form as the other answer suggests.
I've checked a few pages online on how to disable a submit button of a dropdown box unless an option has been selected. But can't find one that works for me.
Any help on how to do that would be great!
Edit: I don't want <option value="not_valid">-- select an option --</option> to be considered as an option
<form action="action_page.php">
<select name="attacks" id="attacks">
<option value="not_valid">-- select an option --</option>
<option value="attack1">1</option>
<option value="attack2">2</option>
<option value="attack3">3</option>
<option value="attack4">4</option>
<option value="attack5">5</option>
</select>
<br>
<input type="button" id="battle" onclick="game()" value="Battle">
</form>
use onChange event
<html>
<head>
</head>
<body>
<form action="action_page.php">
<select name="attacks" id="attacks" onchange="selectChanged()">
<option value="not_valid">-- select an option --</option>
<option value="attack1">1</option>
<option value="attack2">2</option>
<option value="attack3">3</option>
<option value="attack4">4</option>
<option value="attack5">5</option>
</select>
<br>
<input type="button" id="battle" onclick="game()" value="Battle">
</form>
<script>
function selectChanged(){
attacks = document.getElementById("attacks");
if(attacks.value =="not_valid"){//or whatever th unwanted value is
document.getElementById("battle").disabled = true;
} else{
document.getElementById("battle").disabled = false;
}
}
</script>
</body>
</html>
<form action="getDepartmentID" method="post">
<div id=main>
<select id="depList"name="depList"style="width:190px;"class="selListBox">
<option value="0">[Please Select]</option>
<option value="43">Information Technology</option>
<option value="44">Costing and Budgeting</option>
<option value="45">Supply Chain</option>
<option value="61">Marketing</option>
<option value="62">Financial</option>
<option value="63">HR</option>
</select>
</div>
</form>
on submit , query string contain parameter with value i.e. ?depList=43
When I populate this list using jquery .load(); function i.e.
$('#main').load('ajax/Options.jsp');
Options.jsp
<select id="depList"name="depList"style="width:190px;"class="selListBox">
<option value="0">[Please Select]</option>
<option value="43">Information Technology</option>
<option value="44">Costing and Budgeting</option>
<option value="45">Supply Chain</option>
<option value="61">Marketing</option>
<option value="62">Financial</option>
<option value="63">HR</option>
</select>
it successfully populate but when I press submit after selecting an options, it does not send any parameter, even I use the following
$("#depList").change(function() {
$('#depList option:selected').attr('checked', 'checked');
});
How to resolve this situation?
If you want the form information in the query string upon submit you need to be using GET not POST
<form action="getDepartmentID" method="get">