I'm trying to create a simple HTML page that presents a user with several options via checkboxes. I need to generate a string, stored in a variable that I can use on the page when a button is clicked, which will vary based on which boxes are checked.
The string will be a URL ("http://example.com/index.htm&term=") and will need to have additional text appended to it for each checkbox that is checked.
For example, if only a single box, say box1, is checked the string "box1" should be appended to the URL variable to look like "http://example.com/index.htm&term=box1"
If, however more than one box is checked, say box2 and box3 are checked, then the string "box2%20OR%20box3" should be appended to the URL string.
I'm pretty sure this can be done with JavaScript but I have no experience with it and would appreciate some guidance/examples.
Instead of storing it in a variable, I would recommend calling a function that builds the link when the button is pressed. If you really wanted to put it in a variable though, you would set up an event listener for the change event for each checkbox, and call the function to update the variable each time one of the checkboxes is checked or unchecked.
function checkboxUrl(checkboxes) {
const
url = `http://example.com/index.html`,
checkedArray = [];
for (let checkbox of checkboxes) {
if (checkbox.checked) checkedArray.push(checkbox);
};
const checkboxString = checkedArray.map(checkbox => checkbox.value).join(`%20OR%20`);
return url + (checkboxString ? `?term=` + checkboxString : ``);
}
let checkboxes = document.querySelectorAll(`input[type='checkbox']`);
label {
display: block;
}
<label><input type='checkbox' value='box1'>box1</label>
<label><input type='checkbox' value='box2'>box2</label>
<label><input type='checkbox' value='box3'>box3</label>
<button onclick='console.log(checkboxUrl(checkboxes))'>Get URL</button>
If you use Jquery you can do something like this:
<input type="checkbox" id="box1">
<input type="checkbox" id="box2">
<button type="button" id="myButton">Submit</button>
<script>
$(document).ready(function(){
$('#myButton').click(function(){
var url = 'www.myurl.com/index.html&term=';
var checkboxList = [];
var params = '';
$(':checkbox:checked').each(function(){
checkboxList.push($(this).attr('id'));
});
params = checkboxList.join('%'); //will output "box1%box2"
url += params //www.myurl.com/index.html&term=box1%box2
window.location.href = url;
});
});
</script>
Related
I am trying to select some radio button on a webpage using Javascript inside Tampermonkey. For this particular button, there is no element ID, so I'm not really sure how to select them.
There's really no other identifying elements for these buttons that I can see.
Note: There's several radio buttons on this page, and the only unique identifier between them is the "value." There are 12 other buttons, but I want these 3 selected by default after the page loads.
<input name="Offense" type="radio" value="Indifferent">
<input name="Likelihood" type="radio" value="Indifferent">
<input name="Humor" type="radio" value="Indifferent">
So, I tried to catch them all at once with this:
document.getElementByValue("Indifferent").checked = true;
but it's not doing anything, I'm sure I'm missing something.
Thank you!
Using querySelector/querySelectorAll from Selectors API returns a NodeList of matching DOM Nodes. Since it is not an Array, a for-loop is used:
var inputs = document.querySelectorAll('input[value="Indifferent"]');
for (var i = 0; i < inputs.length; i++) {
inputs[i].checked = true;
}
The same in jQuery:
$('input[value="Indifferent"]').attr('checked', true);
// list will contain all the radio buttons
var list = $('input[value="Indifferent"]')
$.each(list, function(index, value) {
alert( index + ": " + value );
});
All the data you need will be in the value object
https://jsfiddle.net/o46rhpwL/
And if you are looking for the checked value in the list
https://jsfiddle.net/z73ah82b/
I have the following code which adds together checkboxes when they are selected and produces a total at the bottom of the page. This function uses the following code:
<script type="text/javascript">
function checkTotal() {
document.listForm.total.value = '';
var sum = 68.50;
for (i=0;i<document.listForm.choice.length;i++) {
if (document.listForm.choice[i].checked) {
sum = sum + parseFloat(document.listForm.choice[i].value);
}
}
document.listForm.total.value = sum.toFixed(2);
}
</script>
These checkboxes are within a form, and I need the form to send through to an email account. At the moment because all the checkboxes share the same input name 'choice' the PHP will only send the last checked box value.
I need to change the checkboxes input name code to name the different checkboxes 'choice1' 'choice2' 'choice3'. What would I have to change in the javascript to in order for the function to calculate all the checkboxes names 'choice1' 'choice2' 'choice3' etc rather than just adding together all checkboxes named'choice'? I have little Javascript and PHP knowledge so any help would be grateful. Thanks.
Rather than make the checkbox names unique, it would be better to append "[]" to their name. This will cause PHP to convert the values into an array, rather than just keep the last value.
So you would want a name of choice[] rather than choice.
You can also find some sample code in this answer.
The code below works ok (a self contained web page). The problem is how to get the array (group) of checkboxes when they're called different names. If you use jquery you could give them all the same class, then get hold of them by that class, but if you're using bare javascript then you can get the elements by Tag name ("input" in the case of the checkbox), and check each one has a name attribute that starts with "choice", inoring those that don't start with "choice", like buttons (also an input) or maybe other checkboxes with different names. It's a bit inefficient if the page is huge, unless you group the checkboxes some way.
To group them, you cold put them in a tag like
`<div id="checkboxes"> (checkboxes go here) </div>`
then use
`var cb = document.getElementById("checkboxes");`
`var arrInputs =cb.getElementsByTagName("input");`
for the line to get the arrInputs array. This would just get input type elements from within the Div. Hwever I dind't want to assume the page layout allows your checkboxes to be put in one div
Hope this helps
Doug
<script type="text/javascript">
function checkTotal() {
document.forms.listForm.total.value = '';
var sum = 68.50;
var frm=document.forms.listForm; // wasnt sure what your original listForm element was so I've put this form into a variable, frm
frm.total.value = '';
var arrInputs =document.getElementsByTagName("input"); // get all Input type elements on the form
for (i=0; i < arrInputs .length;i++) {
if (arrInputs[i].name.substr(0,6) == "choice") { // if the name starts with "choice"
if (arrInputs[i].checked) {
sum = sum + parseFloat(arrInputs[i].value);
}
}
}
frm.total.value = sum.toFixed(2);
}
</script>
</head>
<body>
<form name="listForm">
<a href='javascript:checkTotal()'>check</a><br>
<input type=checkbox name="choice1" value="1"><br>
<input type=checkbox name="choice2" value="2"><br>
<input type=checkbox name="choice3" value="3"><br>
<input type=checkbox name="choice4" value="4"><br>
<input type=checkbox name="choice5" value="5"><br>
<input type=checkbox name="choice6" value="6"><br>
<br>
<input type=text name=total value=""><br>
</form>
</body>
</html>
Am able to store one text box to local storage via a button. How would I go about allowing it to take in all the text boxes I have in my 'survey'? Create id's for each text box then listing them all out within the get/set of my js?
<label for="serveri"> Server: </label> <input type='text' name="server" id="saveServer"/> <button onclick="saveData()" type="button" value="Save" id="Save">Save</button>
var save_button = document.getElementById('Save')
save_button.onclick = saveData;
function saveData(){
var input = document.getElementById("saveServer");
localStorage.setItem("server", input.value);
var storedValue = localStorage.getItem("server");
}
To get a better understanding(all text boxes), here is the whole in JSfiddle:http://jsfiddle.net/BDutb/
If you use a library like jQuery you can get the elements and loop through the values very easily. If you want the localStorage variables names to make sense then assign the input fields names and you can do:
See my example here:
http://jsfiddle.net/spacebean/BDutb/11/
$('form').submit(function() {
$('input, select, textarea').each(function() {
var value = $(this).val(),
name = $(this).attr('name');
localStorage[name] = value;
});
});
I shortened the form for demo sake, but you should be able to take it from there.
Edit: updated fixed jsFiddle link.
I wanna implement this using jquery instead of inline but Its not working, inline works fine. The other reason I wanna use jquery is if user selects more than one checkbox, the url should be appended with whatever is already there + OR '2nd CheckBox Value' like this:
"http://mysite/sites/dev/contact-us/Pages/LocationSearchTestPage.aspx?s=bcs_locations&k=Office OR Hospital"
The space infront and following OR is fine..
How can I achieve this? Can someone help me out?
Offices<input name="LocType" type="checkbox"
value="Office" onclick="window.location='http://mysite/sites/dev/contact-us/Pages/LocationSearchTestPage.aspx?s=bcs_locations&k=Office'; return true;">
Hospitals<input name="LocType" type="checkbox"
value="Hospital" onclick="window.location='http://mysite/sites/dev/contact-us/Pages/LocationSearchTestPage.aspx?s=bcs_locations&k=Hospital'; return true;">
Facilities<input name="LocType" type="checkbox"
value="Facility" onclick="window.location='http://mysite/sites/dev/contact-us/Pages/LocationSearchTestPage.aspx?s=bcs_locations&k=Facility'; return true;">
Bind to the change event on the checkboxes. When clicked read the current checkbox value and then all other relative checkboxes. Append your base url with your custom query string and go crazy. :)
This isn't tested but hopefully it's a good starting point.
var baseUrl = 'http://mysite/sites/dev/contact-us/Pages/LocationSearchTestPage.aspx?s=bcs_locations&k=';
$(document).ready(function () {
// listen to change event (customize selector to your needs)
$('input[type=checkbox]').change(function (e) {
e.preventDefault();
if ($(this).is(':checked')) {
// read in value
var queryString = $(this).val();
// loop through siblings (customize selector to your needs)
var s = $(this).siblings();
$.each(s, function () {
// see if checked
if ($(this).is(':checked')) {
// append value
queryString += ' OR ' + $(this).val();
}
});
// jump to url
window.location = baseUrl + queryString;
}
});
});
You can try this.
HTML
<input name="LocType" type="checkbox" value="Office" />
<input name="LocType" type="checkbox" value="Hospital" />
<input name="LocType" type="checkbox" value="Facility" />
JS
Assuming you have a button or something on click of which you want to create a url with all the checked LocType checkbox values appended to the url seperated by OR
var url = "http://mysite/sites/dev/contact-us/Pages/LocationSearchTestPage.aspx?s=bcs_locations";
$('button').click(function(){
//This will get the array containing values of checked LocType checkboxes
var checkedLocTypeValues = $('input[name=LocType]:checked').map(function(){
return this.value;
});
//Use Array.join() method to join the array elements by " OR "
url = url + "&k=" + checkedLocTypeValues.join(" OR ");
//Now you can use url variable which has all the checked LocType checkboxes value
}
jQuery map() reference - http://api.jquery.com/jQuery.map/
I have N number of radio button groups in the page with auto generated names.
I want to call a javascript function as the value of the checked property. THIS LINE EXCLUDED AFTER EDIT ( Depending on the return value, the radio button needs to be checked or unchecked.)
<input type="radio" name="auto_generated_name" value="some_value" checked="test_check(args);" />
and the javascript function is
function test_check(params) {
if(conditions){
return true;
}
else
return false;
}
But that does not work. Whatever value I assign to 'checked' property, be it any javascript function or any string etc, the radio button becomes checked.
How can I achieve my goal?
EDIT:
<input type="radio" name="auto_generated_name" value="somevalue" onclick="test_check(args)"/>
4 radio buttons make a group. such N radio groups have html class names in this way : button_group_1, button_group_2, button_group_3, button_group_4 etc.
The 'args' need to be these class (i.e. radio button group) names and the corresponding values (from value="1", value="2", value="3" and value="4" ).
Cookies with the class names and values will be created inside the javascript function.
On page refresh, cookies matching with the class names will be checked and depending on the existence of the corresponding cookies, the radio button will be checked or unchecked.
How to achieve the goals/
Assuming you are using jQuery, use the change event: http://api.jquery.com/change/
The checked attribute is simply a boolean value to indicate whether the radio button should be checked, it cannot contain script, or a reference to a scripting function. Any value in the attribute will cause the radio button to be checked.
Without knowing what mechanism you are using to check each radio button - I can see an args variable but don't know what type this is - it's going to be tricky to write some code for you.
If you can make args into an array of values, then something along the lines of the following should work for you:
var args = new Array(true,false,true)
$.each(args, function(index, value) {
$("INPUT[type=radio]").eq(index).attr("checked", value)
});
Here's a fiddle to show what I mean more clearly
check this output, valid args is 'aa'.
http://jsfiddle.net/X7rcC/1
html:
<input type="radio" name="auto_generated_name" value="some_value1" checked="bb" />
js:
$(function() {
var radios = $("input[type='radio']");
$.each(radios, function(index, value){
var args = value.attributes[1].nodeValue;
test_check(args, value);
})
});
function test_check(params, value){
if(params == "aa"){
$(value).attr("checked",true);
}else
$(value).attr("checked",false);
}
try this:
Here I user a custom attribute to input named groupname. In OP's case groupname="<?php echo $radio_button_group_name; ?>". Then checking the value of this attribute OP can assign checked attribute value.
<input type="radio" name="r1" groupname="gr1"/>
<input type="radio" name="r2" groupname="gr2"/>
$('input:radio').each(function() {
if ($(this).attr('groupname') == 'gr1') {
$(this).attr('checked', true);
} else {
$(this).attr('checked', false);
}
});
Your question really boils down to:
How can I set the value of a checkbox when the page first loads? (Using a parameter stored with the checkbox)
The key insights are:
you can't store a function inside a parameter and expect it to automatically evaluate on load
you can store the data about an object inside data- properties
you can set the value of objects on page load in jQuery using the $(document).ready() event
.
<script type="text/javascript">
$(document).ready( function() { // this code runs when the page is first loaded
var radios = $("input[type='radio']"); // find all of your radio buttons
$.each(radios, function(){
var radio = $(this);
var param = radio.attr('data-param'); // retrieve the param from the object
radio.attr('checked', test_check(param) ); // set the value of the radio button
})
});
function test_check(params) {
if(conditions){
return 'checked';
}
else
return '';
}
</script>
You cannot use a checked attribute this way, because anything as the value will be the same as checked=true Even just checked checks a radio button. What you should do is use a custom attribute which will create the checked attribute:
<input type="radio" name="auto_generated_name" value="some_value" needs_check="param">
<script>
// Do test_check on param for each input
$('input:radio').each(function()
{
var radio = $(this);
var param = radio.attr('needs_check');
var condition = test_check(param);
radio.attr('checked', condition);
});
function test_check(param)
{
return true or false based on param
}
</script>
I was facing same problem and my conclusion is that don't use " " to contain a function.
Correct:
<input type="radio" name="im" id="b1" onclick=alert("hello"); />
Incorrect:
<input type="radio" name="im" id="b1" onclick="alert("hello");" />