Develop Reference

How to make a function with multi-condition if-function work?

I have a form which consists of some elements such as a select-input and a checkbox.
The submit-button is disabled and I want to enable the button only if two conditions are fulfilled. An initial version works well, but only if clicking on the checkbox is the last step. But it should be a function that reacts on both, clicks/changes in the select and the checkbox.
The following code is working but with the problem explained above.
$('#toscheck').click(function() {
if ($(this).is(':checked') && $("#ctry").val().length > 0) {
$('#pjo').removeAttr('disabled');
$('#sjo').removeAttr('disabled');
} else {
$('#pjo').attr('disabled', 'disabled');
$('#sjo').attr('disabled', 'disabled');
}
});
The following solution doesn't work:
$('document').ready(function() {
if ($('#toscheck').is(':checked') && $("#ctry").val().length > 0) {
$('#pjo').removeAttr('disabled');
$('#sjo').removeAttr('disabled');
} else {
$('#pjo').attr('disabled', 'disabled');
$('#sjo').attr('disabled', 'disabled');
}
});
But how can I solve this? What I have found on SO wasn't really helpful.
Again: it should work as following; if the checkbox is selected AND the selected option has a value, the button would be enabled.
Thanks in advance.

First, store you element in variables:
let $toscheck = $('#toscheck'),
$ctry = $("#ctry"),
$pjo = $('#pjo'),
$sjo = $('#sjo');
Then, create your validation function with the stored variables. Note that I replace attr and removeAttr with .prop, it is better:
function checkThings(){
if ($toscheck.is(':checked') && $ctry.val().length > 0) {
$pjo.prop('disabled', false);
$sjo.prop('disabled', false);
} else {
$pjo.prop('disabled', true);
$sjo.prop('disabled', true);
}
}
Then, bind the events:
$toscheck.add($ctry).on( 'change', checkThings );
Note that I used change on both elements since it does work with inputs and checkboxes.
Final code :
let $toscheck = $('#toscheck'),
$ctry = $("#ctry"),
$pjo = $('#pjo'),
$sjo = $('#sjo');
function checkThings(){
if ($toscheck.is(':checked') && $ctry.val().length > 0) {
$pjo.prop('disabled', false);
$sjo.prop('disabled', false);
} else {
$pjo.prop('disabled', true);
$sjo.prop('disabled', true);
}
}
$toscheck.add($ctry).on( 'change', checkThings );

$(document).ready(function() {
$('#toscheck,#ctry').change(function() {
if ($('#toscheck').is(':checked') && $("#ctry").val().length > 0) {
$('#pjo').removeAttr('disabled');
$('#sjo').removeAttr('disabled');
} else {
$('#pjo').attr('disabled', 'disabled');
$('#sjo').attr('disabled', 'disabled');
}
});
});
use this code
.change function detects change and then on call check whether your AND condition is met or not
and add #toscheck in quotes i.e. '#toscheck'
$('#toscheck,#xyz,#abc').change()
for detecting change for multiple elements

How to show and hide something in jQuery using if's

Hello everyone so I want to show and hide a button using jQuery, but only if a variable is true for example.
Ex:
var st1wch1 = false;
$(document).ready(function(){
$("#choice1").click(function(){
var st1wch1 = true
state1_1warrior()
});
});
$(document).ready(function(){
if(st1wch1 == false){
$("button#choice1").show()
}
else if(st1wch1 == true){
$("button#choice1").hide()
}
})
But for some reason it never hides, any ideas??? Thanks in Advance.

The most simple way to do it may be this:
$(document).ready(function(){
$("#choice1").click(function(){
$("button#choice1").toggle()
});
});

The logic you've implemented to show or hide the element is defined within the document ready event, which is raised before the user has a chance to click on the button and raise the event handler which toggles your global variable.

You probably wanted to hide and show when the element is clicked?
$("#choice1").click(function(){
$(this).toggle();
});

After changing the variable, you code does not go through the if else conditions. Put that show and hide condition inside a function like below
function toggleButton(){
if(st1wch1 == false){
$("button#choice1").show()
}
else if(st1wch1 == true){
$("button#choice1").hide()
}
}
and then call this function everytime you change the variable's value.

You must place your code inside the click handler.
I think you want to add at least 2 buttons later, and you want to toggle just a part of them or something like this.
var st1wch1 = false;
$(document).ready(function(){
$("#choice1").click(function(){
if(st1wch1 == false){
st1wch1 = true;
$("button#choice1").show()
}
else if(st1wch1 == true){
st1wch1 = false;
$("button#choice1").hide()
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id="choice1">choice1</button>

You can use toggle:
var st1wch1 = true;
$('#choice1').toggle(condition);
Side note: Don't use things like
if (st1wch1 === true)
Do:
if (st1wch1)
and (for the == false / === false case):
if (!st1wch1)

document.ready() is only called when the page initially loads, so it evaluates the if/else statement when you load the page and then never again. Clicking the element doesn't rerun the if else statement.
To get the behavior you want you can either do
$("#choice1").click(function(){
$(this).toggle();
});
or
$("#choice1").click(function(){
evaluateBoolean();
});
function evaluateBoolean(){
if(st1wch1 == false){
$("button#choice1").show()
}
else if(st1wch1 == true){
$("button#choice1").hide()
}
}

You can use toggleClass.
$('#button').toggleClass('hidden', condition);
Created css class with display: none;

Remove option with value = MRW if I checkbox if checked

I'm trying to remove a option with value equal to MRW if #natural_person_lives_in_ccs_0 is checked but if I unchecked the checkbox then the SELECT should be as it was by default meaning same options. This is what I did:
$(document).ready(function(){
var lives_in_css = $('#natural_person_lives_in_ccs_0').is(':checked');
if (lives_in_css) {
$(".shipping_from option[value='MRW']").remove();
} else {
$(".shipping_from").append('<option value="MRW">Option1</option>');
}
});
But it's not working since Option1 is added by default and I don't know how to write this. I think to use .toggle() but don't know if it's the right one. I leave a Plunker here for testing. Any help on this?
Steps:
Check Yes option value=MRW should be removed
Remove the check from Yes option value=MRW as by default (same position)

Try to use the .change() function to accomplish your task here,
$('#natural_person_lives_in_ccs_0').click(function () {
var elem = $(".shipping_from option[value='MRW']");
if (this.checked) {
elem.remove();
} else if (elem.length == 0) {
$(".shipping_from").prepend('<option value="MRW">Option1</option>');
}
});
DEMO
The best way would be,
$('#natural_person_lives_in_ccs_0').click(function () {
$(".shipping_from option[value='MRW']").toggle(!this.checked);
$(".shipping_from option:eq(" + ((this.checked) ? 1 : 0) + ")").prop('selected', true);
});
DEMO

Write your script like bellow.
var showOptionsAcorrdingCheckbox = function(){
var lives_in_css = $('#natural_person_lives_in_ccs_0').is(':checked');
if (lives_in_css) {
$(".shipping_from option[value='MRW']").remove();
} else {
$(".shipping_from").append('<option value="MRW">Option1</option>');
}
}
$(document).ready(function(){
$(':checkbox').change(showOptionsAcorrdingCheckbox);
});

DEMO
code:
$(document).ready(function(){
$(document).on('change', '#natural_person_lives_in_ccs_0', function(){
if($(this).is(':checked'))
{
$(".shipping_from option[value='MRW']").remove();
}
else
{
$(".shipping_from").append('<option value="MRW">Option1</option>');
}
});
});

Trying to execute a if/else statement in JQuery

I'm trying to execute a simple JQuery code a.k.a an if/else statement. Here's my code:
$('#butt_click, #pary').click(function() {
if ($(this).attr('id').val() == "butt_click") {
alert("You clicked button");
} else {
alert("You clicked pary");
}
});
The code above doesn't work AT ALL. Can't seem to find the problem... Help would be appreciated. Thanks..

This doesn’t look right:
$(this).attr('id').val()
Try using $(this).attr('id') or simply this.id instead (if you are trying to access the id property from the clicked element).

You have wrong code.
code must be as below.
if ($(this).val() == "butt_click")
OR
if ($(this).attr('id') == "butt_click")
not
if ($(this).attr('id').val() == "butt_click")

Remove val(). $(this).attr('id') already returns value
if ($(this).attr('id') == "butt_click") {

Remove .val() from if statement
Change your if statement to
if ($(this).attr('id') == "butt_click") {
alert("You clicked button");
} else {
alert("You clicked pary");
}

Checking if the input is checked always returns true

i am trying like this:
if($('input:checkbox:checked').length > 0 == false){
but this will allways return true, doesn't matter if is checked or not
note: there is only one checkbox in the DOM.

Try:
if(!$("input:checkbox").is(":checked")){
//not checked
}

if(!$('input:checkbox').prop('checked')){ //do stuff
Note: jquery version > 1.6 required for prop()

if($('input[type="checkbox"]:checked').length ==0){

Try this
if($("input:checkbox").is(":checked")){
alert('checkbox is checked')
}
else
{
alert('checkbox is not checked')
}
if you have multiple check boxes in your form than iterate each like this
$('input:checkbox:checked').each(function () {
var value = $(this).attr('value');
alert(value);// it returns on or off, depends on checked or unchecked
});

$.extend($.expr[':'], {
unchecked: function (obj) {
return ((obj.type == 'checkbox' || obj.type == 'radio') && !$(obj).is(':checked'));
}
});
if(($('input:unchecked').length > 0)=== false)