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>
Related
I have a form with two datalist and I would like to generate a link based on the user's selection.
<form>
<input list="Cars">
<datalist id="Cars">
<option value="Honda" selected>Honda</option>
<option value="Mazda">Mazda</option>
<option value="Ford">Ford</option>
<option value="Nissan">Nissan</option>
<option value="Subaru">Subaru</option>
</datalist>
<input list="Years">
<datalist id="Years">
<option value="2017">2017</option>
<option value="2016">2016</option>
<option value="2015">2015</option>
</datalist>
<input type="reset">
</form>
For an example, if user chooses Honda and 2017, then the link appears and the address is Honda/2017.net. If the user chooses Subaru and 2015 then the address is Subaru/2015.net and etc.
I can input the different href manually in the code but I am not sure how you make one link change based on selection?
You need Javascript for the so called dynamic html or DHTML. Could be done like this:
<!DOCTYPE html>
<script type="text/javascript">
function generateLink()
{
var brand = document.getElementById('carBrand').value;
var year = document.getElementById('carYear').value;
document.leform.action =brand + '/' + year + '.html';
return true;
}
</script>
<form name="leform" onsubmit="return generateLink();">
<input list="Cars" id='carBrand'>
<datalist id="Cars">
<option value="Honda" selected>Honda</option>
<option value="Mazda">Mazda</option>
<option value="Ford">Ford</option>
<option value="Nissan">Nissan</option>
<option value="Subaru">Subaru</option>
</datalist>
<input list="Years" id='carYear'>
<datalist id="Years">
<option value="2017">2017</option>
<option value="2016">2016</option>
<option value="2015">2015</option>
</datalist>
<input type="reset">
<input type="submit">
</form>
What happens?
If the submit Button is clicked, the generateLink() function is called. onsubmit="return generateLink();"
In the generateLink() function the value of the selected option for the car/brand and the year are read from html using the getElementById function.
Then the extracted values for the brand and the year are used to generate the corresponding link via concatenation of car, a slash, the year and finally the string '.html'.
The link the form will redirect to is set in the forms action attribute. document.leform.action
To process data submitted by the form you will need some kind of CGI mechanism: https://en.wikipedia.org/wiki/Common_Gateway_Interface
You could use PHP to pass data further to a database for example.
Hope this helps ^^-d
PS: You could also want to implement the page that follows the form (action=) in PHP as dynamic content. Using a HTTP GET Request this could look like /show.php?car=Subaru&Year=2016 which would save you from creating an html file per option (car X year = 15 files!). URLs of HTTP GET Requests can be bookmarked like Honda/2017.net. More info on this here: http://php.net/manual/en/reserved.variables.request.php
use below snippet as a boilerplate.
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<form>
<input list="Cars" onchange="generateUrl()">
<datalist id="Cars">
<option value="Honda" selected>Honda</option>
<option value="Mazda">Mazda</option>
<option value="Ford">Ford</option>
<option value="Nissan">Nissan</option>
<option value="Subaru">Subaru</option>
</datalist>
<input list="Years" onchange="generateUrl()">
<datalist id="Years">
<option value="2017">2017</option>
<option value="2016">2016</option>
<option value="2015">2015</option>
</datalist>
<input type="reset">
</form>
<p id="generated">
</p>
<script type="text/javascript">
function generateUrl(){
var x = document.querySelector("[list='Cars']").value;
var y = document.querySelector("[list='Years']").value;
document.getElementById('generated').innerHTML = (x+y);
}
</script>
</body>
</html>
You can grab the values of the <datalist> using the onchange event; store them in a variable somewhere, then write it out to your link.
var car = '';
var year = '';
$("input[name=car-list]").on('change', function(){
car = $(this).val();
});
$("input[name=yr-list]").on('change', function(){
year = $(this).val();
});
$("input[name=submit]").on('click', function(){
$("#mylink").attr('href', car + '/' + year);
$("#mylink").html(car + '/' + year);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<input list="Cars" name="car-list">
<datalist id="Cars">
<option value="Honda" selected>Honda</option>
<option value="Mazda">Mazda</option>
<option value="Ford">Ford</option>
<option value="Nissan">Nissan</option>
<option value="Subaru">Subaru</option>
</datalist>
<input list="Years" name="yr-list">
<datalist id="Years">
<option value="2017">2017</option>
<option value="2016">2016</option>
<option value="2015">2015</option>
</datalist>
<input type="button" name="submit" value="Submit">
<input type="reset">
</form>
<a id="mylink" href="">My Link</a>
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.
Given an HTML form like:
<html>
<body>
<form method="GET">
Select:
<select id="param" name="param">
<option></option>
<option value="Value 1">Value 1</option>
<option value="Value 2">Value 2</option>
<option value="Value 3">Value 3</option>
</select>
<button type="submit">Submit</button>
</form>
</body>
</html>
How can I omit the parameter entirely from the form submission if the blank option is selected?
If you wanted a pure JavaScript approach, something like this would remove the name attribute of the select element if the selected option value was empty before the form is submitted.
Just give the form element a name..
<form name="formName" method="GET"></form>
JS - EXAMPLE HERE
document.forms["formName"].addEventListener('submit', function(){
var el = this.querySelector('select[name="param"]');
if(!el.value){
el.removeAttribute('name');
}
});
Alternatively, here is a jQuery version.. not much different.
EXAMPLE HERE
$('form[name="formName"]').submit(function(e){
var el = $(this).find('select[name="param"]');
if(!el.val()){
el.removeAttr("name");
}
});
This is what I came up with (JQuery):
$("form").submit(function(e) {
if ($("#param").val() === "")
$("#param").removeAttr("name");
});
It has the advantage that it doesn't visibly change the DOM immediately after clicking submit.
Use below code, you need Jquery
<script type="text/javascript">
function checkForm()
{
var paramVal = $('#param').val();
if(paramVal == "0"){ return false;}
}
</script>
<select name="param" id="param">
<option value="0"></option>
<option value="Value 1">Value 1</option>
<option value="Value 2">Value 2</option>
<option value="Value 3">Value 3</option>
</select>
<button type="submit" onclick="return checkForm();">Submit</button>
<script type="text/javascript">
function validate()
{
if ($("#param").val() == "")
$("#param").removeAttr("name");
}
</script>
<form action="" method="post" onsubmit="return validate()">
<select name="param" id="param">
<option value=""></option>
<option value="Value 1">Value 1</option>
<option value="Value 2">Value 2</option>
<option value="Value 3">Value 3</option>
</select>
<button type="submit">Submit</button>
</form>
I have a dropdown form, and when the user clicks on an element I want them to go to the url I have in the code without hitting a submit button. Here is the code I have so far
<select name="mydropdown" class="styled" onChange="location=document.jump.menu.options[document.jump.menu.selectedIndex].value;" value="GO">
<option value="http://www.cats.com">Select Your Compliance Center</option>
<option value="http://www.funcats.com">Fresh Milk</option>
<option value="http://cutecats.com">Old Cheese</option>
<option value="http://lolcats.com">Hot Bread</option>
</select>
but it doesn't seem to be working.
Any help would be greatly appreciated.
Use this:
<select name="mydropdown" class="styled" onChange="document.location = this.value" value="GO">
<option value="http://www.cats.com">Select Your Compliance Center</option>
<option value="http://cutecats.com">Old Cheese</option>
<option value="http://lolcats.com">Hot Bread</option>
</select>
More or less the same as the other answer, but this one goes through a form.
<form name="linkForm" method="POST" action="" id="form">
<select name="mydropdown" class="styled" onchange="document.getElementById('form').setAttribute('action', this.value); document.linkForm.submit(); ">
<option value="http://www.cats.com">Select Your Compliance Center</option>
<option value="http://www.funcats.com">Fresh Milk</option>
<option value="http://cutecats.com">Old Cheese</option>
<option value="http://lolcats.com">Hot Bread</option>
</select>
</form>
i see there is a disabled property on a specific item in the dropdown list but is there an enabled property on the whole html dropdown itself?
any suggestions?
According to the HTML 4 spec a select element has a disabled attribute.
So
<select disabled>
<option>Something</option>
</select>
should work
disabled="disabled"
This will disable a value within the combo box (it will still show up, but it will not have the ability to be selected):
<select>
<option disabled="disabled" value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
This will disable the whole combo box:
<select disabled="disabled">
<option value="volvo">Volvo</option>
<option value="saab">Saab</option>
<option value="mercedes">Mercedes</option>
<option value="audi">Audi</option>
</select>
may this will help
is same as :
<html>
<head>
<script type="text/javascript">
function makeDisable(){
var x=document.getElementById("mySelect")
x.disabled=true
}
function makeEnable(){
var x=document.getElementById("mySelect")
x.disabled=false
}</script></head><body><form>
<select id="mySelect"><option>Apple</option><option>Banana</option>
<option>Orange</option>
</select>
<input type="button" onclick="makeDisable()" value="Disable list">
<input type="button" onclick="makeEnable()" value="Enable list">
</form>
</body>
</html>