I want to get the answers to a form upon submission and parse them to JSON.
This works quite good but I want some validation before sending the data.
I tried a lot of variations of the snippet down below but am still stuck.
Steps:
Prevent default event on "send"
Get Form
Iterate through the elements of the form
Eliminate empty items and their value
If checkbox is checked: value = true
Store correct items in data
Return data
Somehow I can't get to work steps 4 and 5 work at the same time, every time I get one of them to work I screw over the other one.
In this snippet, the checkbox works as intented but the textfield doesn't:
If anybody can point me in the right direction with the if/else statements or something like that it would be greatly appreciated.
document.addEventListener('DOMContentLoaded', function(){
var data = {};
var formToJSON = function formToJSON(form) {
var data = {};
for (var i = 0; i < form.length; i++) {
var item = form[i];
//looking for checkbox
if (item.value =="") {
continue;
}
else {
if (item.checked == false) {
data[item.name] = false;
}
else {
data[item.name] = item.value;
}
}
}
return data; };
var dataContainer = document.getElementsByClassName('results__display')[0];
form = document.getElementById('formular').querySelectorAll('input,select,textarea');
butt = document.getElementById('knopfabsenden');
butt.addEventListener('click', function (event) {
event.preventDefault();
handleFormSubmit(form = form);
});
var handleFormSubmit = function handleFormSubmit(event) {
var data = formToJSON(form);
dataContainer.textContent = JSON.stringify(data, null, " ");
}
}, false);
<div id="formular">
<label class="formular__label" for="machineName">Textfield Test</label>
<input class="formular__input formular__input--text" id="machineNumber" name="machineNumber" type="text"/>
<br>
<input class="formular__input formular__input--checkbox" id="checkTest" name="checkTest" type="checkbox" value="true"/>
<label class="formular__label formular__label--checkbox" for="checkTest">Checkbox Test</label>
<br>
<button class="formular__button" id="knopfabsenden" type="submit">Submit</button>
</div>
<div class="results">
<h2 class="results__heading">Form Data</h2>
<pre class="results__display-wrapper"><code class="results__display"></code></pre>
</div>
The problem is .checked will always be false if it doesn't exist. So the text field gets the value false.
for (var i = 0; i < form.length; i++) {
var item = form[i];
//looking for checkbox
if (item.value ==="") {
continue;
}
else {
if (item.type === "text") {
data[item.name] = item.value;
}
else if (item.type === "checkbox"){
data[item.name] = item.checked;
}
}
}
In this code snippet I check the type of the input and handle it accordingly. also notice I use the === operator and not the == operator as a best practice (Difference between == and === in JavaScript)
I have a form with multiple checkboxes and I want to use JavaScript to make sure at least one is checked. This is what I have right now but no matter what is chosen an alert pops up.
JS (wrong)
function valthis(){
if (document.FC.c1.checked) {
alert ("thank you for checking a checkbox")
} else {
alert ("please check a checkbox")
}
}
HTML
<p>Please select at least one Checkbox</p>
<br>
<br>
<form name = "FC">
<input type = "checkbox" name = "c1" value = "c1"/> C1
<br>
<input type = "checkbox" name = "c1" value = "c2"/> C2
<br>
<input type = "checkbox" name = "c1" value = "c3"/> C3
<br>
<input type = "checkbox" name = "c1" value = "c4"/> C4
<br>
</form>
<br>
<br>
<input type = "button" value = "Edit and Report" onClick = "valthisform();">
So what I ended up doing in JS was this:
function valthisform(){
var chkd = document.FC.c1.checked || document.FC.c2.checked||document.FC.c3.checked|| document.FC.c4.checked
if (chkd == true){
} else {
alert ("please check a checkbox")
}
}
I decided to drop the "Thank you" part to fit in with the rest of the assignment. Thank you so much, every ones advice really helped out.
You should avoid having two checkboxes with the same name if you plan to reference them like document.FC.c1. If you have multiple checkboxes named c1 how will the browser know which you are referring to?
Here's a non-jQuery solution to check if any checkboxes on the page are checked.
var checkboxes = document.querySelectorAll('input[type="checkbox"]');
var checkedOne = Array.prototype.slice.call(checkboxes).some(x => x.checked);
You need the Array.prototype.slice.call part to convert the NodeList returned by document.querySelectorAll into an array that you can call some on.
This should work:
function valthisform()
{
var checkboxs=document.getElementsByName("c1");
var okay=false;
for(var i=0,l=checkboxs.length;i<l;i++)
{
if(checkboxs[i].checked)
{
okay=true;
break;
}
}
if(okay)alert("Thank you for checking a checkbox");
else alert("Please check a checkbox");
}
If you have a question about the code, just comment.
I use l=checkboxs.length to improve the performance. See http://www.erichynds.com/javascript/javascript-loop-performance-caching-the-length-property-of-an-array/
I would opt for a more functional approach. Since ES6 we have been given such nice tools to solve our problems, so why not use them.
Let's begin with giving the checkboxes a class so we can round them up very nicely.
I prefer to use a class instead of input[type="checkbox"] because now the solution is more generic and can be used also when you have more groups of checkboxes in your document.
HTML
<input type="checkbox" class="checkbox" value=ck1 /> ck1<br />
<input type="checkbox" class="checkbox" value=ck2 /> ck2<br />
JavaScript
function atLeastOneCheckboxIsChecked(){
const checkboxes = Array.from(document.querySelectorAll(".checkbox"));
return checkboxes.reduce((acc, curr) => acc || curr.checked, false);
}
When called, the function will return false if no checkbox has been checked and true if one or both is.
It works as follows, the reducer function has two arguments, the accumulator (acc) and the current value (curr). For every iteration over the array, the reducer will return true if either the accumulator or the current value is true.
the return value of the previous iteration is the accumulator of the current iteration, therefore, if it ever is true, it will stay true until the end.
Check this.
You can't access form inputs via their name. Use document.getElements methods instead.
Vanilla JS:
var checkboxes = document.getElementsByClassName('activityCheckbox'); // puts all your checkboxes in a variable
function activitiesReset() {
var checkboxesChecked = function () { // if a checkbox is checked, function ends and returns true. If all checkboxes have been iterated through (which means they are all unchecked), returns false.
for (var i = 0; i < checkboxes.length; i++) {
if (checkboxes[i].checked) {
return true;
}
}
return false;
}
error[2].style.display = 'none'; // an array item specific to my project - it's a red label which says 'Please check a checkbox!'. Here its display is set to none, so the initial non-error label is visible instead.
if (submitCounter > 0 && checkboxesChecked() === false) { // if a form submit has been attempted, and if all checkboxes are unchecked
error[2].style.display = 'block'; // red error label is now visible.
}
}
for (var i=0; i<checkboxes.length; i++) { // whenever a checkbox is checked or unchecked, activitiesReset runs.
checkboxes[i].addEventListener('change', activitiesReset);
}
Explanation:
Once a form submit has been attempted, this will update your checkbox section's label to notify the user to check a checkbox if he/she hasn't yet. If no checkboxes are checked, a hidden 'error' label is revealed prompting the user to 'Please check a checkbox!'. If the user checks at least one checkbox, the red label is instantaneously hidden again, revealing the original label. If the user again un-checks all checkboxes, the red label returns in real-time. This is made possible by JavaScript's onchange event (written as .addEventListener('change', function(){});
You can check that atleast one checkbox is checked or not using this simple code. You can also drop your message.
Reference Link
<label class="control-label col-sm-4">Check Box 2</label>
<input type="checkbox" name="checkbox2" id="checkbox2" value=ck1 /> ck1<br />
<input type="checkbox" name="checkbox2" id="checkbox2" value=ck2 /> ck2<br />
<script>
function checkFormData() {
if (!$('input[name=checkbox2]:checked').length > 0) {
document.getElementById("errMessage").innerHTML = "Check Box 2 can not be null";
return false;
}
alert("Success");
return true;
}
</script>
< script type = "text/javascript" src = "js/jquery-1.6.4.min.js" > < / script >
< script type = "text/javascript" >
function checkSelectedAtleastOne(clsName) {
if (selectedValue == "select")
return false;
var i = 0;
$("." + clsName).each(function () {
if ($(this).is(':checked')) {
i = 1;
}
});
if (i == 0) {
alert("Please select atleast one users");
return false;
} else if (i == 1) {
return true;
}
return true;
}
$(document).ready(function () {
$('#chkSearchAll').click(function () {
var checked = $(this).is(':checked');
$('.clsChkSearch').each(function () {
var checkBox = $(this);
if (checked) {
checkBox.prop('checked', true);
} else {
checkBox.prop('checked', false);
}
});
});
//for select and deselect 'select all' check box when clicking individual check boxes
$(".clsChkSearch").click(function () {
var i = 0;
$(".clsChkSearch").each(function () {
if ($(this).is(':checked')) {}
else {
i = 1; //unchecked
}
});
if (i == 0) {
$("#chkSearchAll").attr("checked", true)
} else if (i == 1) {
$("#chkSearchAll").attr("checked", false)
}
});
});
< / script >
Prevent user from deselecting last checked checkbox.
jQuery (original answer).
$('input[type="checkbox"][name="chkBx"]').on('change',function(){
var getArrVal = $('input[type="checkbox"][name="chkBx"]:checked').map(function(){
return this.value;
}).toArray();
if(getArrVal.length){
//execute the code
$('#msg').html(getArrVal.toString());
} else {
$(this).prop("checked",true);
$('#msg').html("At least one value must be checked!");
return false;
}
});
UPDATED ANSWER 2019-05-31
Plain JS
let i,
el = document.querySelectorAll('input[type="checkbox"][name="chkBx"]'),
msg = document.getElementById('msg'),
onChange = function(ev){
ev.preventDefault();
let _this = this,
arrVal = Array.prototype.slice.call(
document.querySelectorAll('input[type="checkbox"][name="chkBx"]:checked'))
.map(function(cur){return cur.value});
if(arrVal.length){
msg.innerHTML = JSON.stringify(arrVal);
} else {
_this.checked=true;
msg.innerHTML = "At least one value must be checked!";
}
};
for(i=el.length;i--;){el[i].addEventListener('change',onChange,false);}
<label><input type="checkbox" name="chkBx" value="value1" checked> Value1</label>
<label><input type="checkbox" name="chkBx" value="value2"> Value2</label>
<label><input type="checkbox" name="chkBx" value="value3"> Value3</label>
<div id="msg"></div>
$('input:checkbox[type=checkbox]').on('change',function(){
if($('input:checkbox[type=checkbox]').is(":checked") == true){
$('.removedisable').removeClass('disabled');
}else{
$('.removedisable').addClass('disabled');
});
if(($("#checkboxid1").is(":checked")) || ($("#checkboxid2").is(":checked"))
|| ($("#checkboxid3").is(":checked"))) {
//Your Code here
}
You can use this code to verify that checkbox is checked at least one.
Thanks!!
I have two radio buttons on the top (YES/NO) If yes the javascript function showhideform shows another text box(certificate). This form is in a loop as you see with all my outputs.If yes is chosen and loop is 1 everything works fine onsubmit. If Yes and I submit when loop is 2 it only validates certificate textbox 2 and forgets about certificate textbox 1. I need it to validate both if yes is chosen twice.
Radio Buttons:
<input
type="radio"
value="No"
name="abc_<cfoutput>#BAdd#</cfoutput>"
id="noabc_<cfoutput>#BAdd#</cfoutput>"
onchange="showhideForm_<cfoutput>#BAdd#</cfoutput>(this.value);"/>
<label for="noabc_<cfoutput>#BAdd#</cfoutput>">No</label>
<input
type="radio"
value="Yes"
name="abc_<cfoutput>#BAdd#</cfoutput>"
id="abc_<cfoutput>#BAdd#</cfoutput>"
required="yes"
onchange="showhideForm_<cfoutput>#BAdd#</cfoutput>(this.value);"/>
<label for="abc_<cfoutput>#BAdd#</cfoutput>">Yes</label>
Show / Hide Radio Buttons:
function showhideForm_<cfoutput>#BAdd#</cfoutput>(abc_<cfoutput>#BAdd#</cfoutput>) {
if (abc_<cfoutput>#BAdd#</cfoutput> == "Yes") {
document.getElementById("div1_<cfoutput>#BAdd#</cfoutput>").style.display = 'block';
document.getElementById("div2_<cfoutput>#BAdd#</cfoutput>").style.display = 'none';
}
else if (abc_<cfoutput>#BAdd#</cfoutput> == "No") {
document.getElementById("div2_<cfoutput>#BAdd#</cfoutput>").style.display = 'block';
document.getElementById("div1_<cfoutput>#BAdd#</cfoutput>").style.display = 'none';
}
}
Validating through loop:
function doSubmit(n) {
var QnoText = ['abc_<cfoutput>#BAdd#</cfoutput>']; // add IDs here for questions with optional text input
var ids = '';
flag = true;
for (i=0; i<QnoText.length; i++) {
CkStatus = document.getElementById(QnoText[i]).checked;
ids = QnoText[i]+'Certificate_<cfoutput>#BAdd#</cfoutput>' + n;
if (CkStatus && document.getElementById(ids).value == '') {
alert('Please enter certificate number ' + n + '.');
document.getElementById(ids).focus();
flag = false;
}
}
return flag;
}
Certificate textbox:
<input
type="text"
name="abc_<cfoutput>#BAdd#</cfoutput>Certificate_<cfoutput>#BAdd#</cfoutput>"
validateat="onSubmit"
validate="maxlength"
id="abc_<cfoutput>#BAdd#</cfoutput>Certificate_<cfoutput>#BAdd#</cfoutput>"
size="54"
maxlength="120"
value="">
submit button:
//return doSubmit(1);
It looks like the n is just a numbering/index to the id of the input textbox it is validating.
Looking at your code, CKStatus seems to me is a checkbox. If it is checked, it will validate the certificate input text box according to the parameter n.
After days of working on it I have finally figured it out!! I just wanted to say thanks to everyone that has helped and this is the code for anyone who was interested!
<script type="text/javascript">
function doSubmit() {
var count =<cfoutput>#BAdd#</cfoutput>;
flag = true;
for (i=1; i<=count; i++){
var ids = 'abc_'+i +'Certificate_'+i;
var Radio = 'abc_'+i
CkStatus = document.getElementById(Radio).checked;
if (CkStatus && document.getElementById(ids).value == '') {
alert('Please enter certificate number ' +i);
document.getElementById(ids).focus();
flag = false;
}
}
return flag;
}
</script>
I have drop-down and Textbox inside a Gridview so I want to check the followings on a button click:
(1) Check if NOTHING is selected from the drop down first (the drop-down options are either YES, NO or NA) . If nothing is selected, I want to show message that reads like this “Please make selection from the drop-down”
(2) If the selection from the drop-down is NO and the Textbox is blank or empty then I want to show message that says: “Please provide comments”
The first code checks if the text-box is blank and it works and the 2nd code checks if no selection is made from the drop down and that one works fine too so how can i combine between those 2 codes? I want to execute both codes on button click, right now it is only calling the first code. please help. Thanks.
here is my code that checks if the textbox is blank:
<script type ="text/javascript">
function Validate() {
var flag = false;
var gridView = document.getElementById('<%= GridView1.ClientID %>');
for (var i = 1; i < gridView.rows.length; i++) {
var selects = gridView.rows[i].getElementsByTagName('select');
var areas = gridView.rows[i].getElementsByTagName('textarea');
if (selects != null && areas != null) {
if (areas[0].type == "textarea") {
var txtval = areas[0].value;
var selectval = selects[0].value;
if (selectval == "No" && (txtval == "" || txtval == null)) {
flag = false;
break;
}
else {
flag = true;
document.getElementById('<%=btnSubmit.ClientID%>').style.visibility = 'visible';
}
}
}
}
if (!flag) {
alert('Please note that comments are required if you select "No" from the dropdown box. Thanks');
document.getElementById('<%=btnSubmit.ClientID%>').style.visibility = 'hidden';
}
return flag;
}
</script>
and here is the code that checks the drop-down
<script type="text/javascript">
function validate_DD() {
var flag = true;
var dropdowns = new Array(); //Create array to hold all the dropdown lists.
var gridview = document.getElementById('<%=GridView1.ClientID%>'); //GridView1 is the id of ur gridview.
dropdowns = gridview.getElementsByTagName('Select'); //Get all dropdown lists contained in GridView1.
for (var i = 0; i < dropdowns.length; i++) {
if (dropdowns.item(i).value == 'Select') //If dropdown has no selected value
{
flag = false;
break; //break the loop as there is no need to check further.
}
}
if (!flag) {
alert('Please select either Yes, No or NA in each dropdown and click the Save button again. Thanks');
document.getElementById('<%=btnSubmit.ClientID%>').style.visibility = 'hidden';
}
return flag;
}
</script>
Try this:
<select id="ddlCars">
<option value="1">Honda</option>
<option value="2" selected="selected">Toyota</option>
<option value="3">BMW</option>
</select>
Accessing dropdown:
To get the value:
var el = document.getElementById("ddlCars");
var val = el.options[el.selectedIndex].value; // val will be 2
To get the text:
var el = document.getElementById("ddlCars");
var car = el.options[el.selectedIndex].text; //car will be Toyota
I want to slide some jquery into a piece of another programmers javascript code that I have to work worth. Can I do this? Look at the code for the 'radio'.
function blank(field) {
if ((field.type == "text" || field.type == "textarea") && (field.value == " " || field.value == ""))
{
return true;
}
else if field.type = "radio"
{
$('input[type='radio', **name=passField.NameHere**]:checked').size() > 0);
}
}
so in the above I want to use jquery to see if anything in a radio group has been checked.
Example of radio code:
<input type="radio" name="2074" id="2074" value="Yes" class="valuetext>Yes
<input type="radio" name="2074" id="2074" value="No" class="valuetext>No
I want to pass the field.name which has already been captured in another function, into the jquery call. Is this possible? If so, how?
Below is the function that gathers the fields that need to be exampled:
var field = [], blankFields = [],
listText = [], listItem = [], fieldId = [], label = [];
function checkRequired(fieldList) {
for (var i = 0; i < fieldList.length; i++)
{
listText = fieldList[i];
listText = listText.substring(1, listText.length - 1);
listItem = listText.split("||");
fieldId = listItem[0];
label = listItem[1];
field = document.getElementById(fieldId);
if (visible(field) && blank(field)){
blankFields.push(label);
}
}
//return blankFields;
if (blankFields.length > 0) {
displayError(blankFields);
}
}
Any help would be appreciated.
Yes, it looks like field is the actual DOM object, so:
$('input[type="radio"][name="' + field.name + '"]:checked').size() > 0);
Note that you have several syntax errors in the code other than the obvious place you were calling out a placeholder. For instance:
else if field.type = "radio"
You need parens around the condition, and = should be == or ===.
Also note that I changed ' to " in a couple of places, because originally you had:
$('input[type='radio']...
...which ends the string just after type=, since the string started with ' and therefore ends with '.