Why is .every() not a function?
Solution 1
jQuery does not have a .every()
method. .every
is defined at Array.prototype
.
You can use .toArray()
to convert jQuery object to an Array
, within .every()
callback function pass current DOM
element to jQuery()
to get jQuery object representation of element where .hasClass()
can be chained.
function submitEnabler(inputs) {
console.log(inputs.toArray().every(isValid));
}
function isValid(input) {
return $(input).hasClass('is_glowing_success');
}
Solution 2
Because jQuery objects have no every
method, and formInputs
is a jQuery object.
If you want an array instead, call get()
to get one.
I've gathered an Array (I think) of required form elements...
No, it's just jQuery object. jQuery objects are very array-like, but they aren't arrays. Worse, they have some array-like methods (such as filter
and map
) that call their callbacks with different arguments than the equivalent Array.prototype
methods.
In isValid
, you'd need to handle the fact you're now dealing with a raw DOM element, which means either wrapping it with a jQuery object and using hasClass
:
function isValid(input) {
return $(input).hasClass('is_glowing_success');
}
or using the DOM's classList
:
function isValid(input) {
return input.classList.contains('is_glowing_success');
}
That latter works on all modern browsers, but not all older ones. However, it can be polyfilled on older browsers. More about that on MDN.
CodeFinity
BY DAY: Consulting/freelance projects for responsive websites and e-commerce - unless I'm teaching Web Development at the local college or boot camp. FOR FUN: Watch WWE with my kids, Blacklist, Read Reader's Digest or books on WW2 or self-improvement - maybe some Stephen King or even some classics.
Updated on June 07, 2022Comments
-
CodeFinity almost 2 years
I've gathered an Array (I think) of required form elements, and have added 'blur' listener.
var formInputs = $(':input').filter('[required]'); formInputs.each(function(i) { $(this).on('blur', function() { // Each time we leave a 'required' field, check to see if we can activate the 'submit' button. submitEnabler(formInputs); }); });
So, once someone has left one of these fields, I want to run through this array using .every() and check if the fields are valid - that is if they have a 'success' class that I have defined.
function isValid(input) { return input.hasClass('is_glowing_success'); } function submitEnabler(inputs) { console.log(inputs.every(isValid)); }
I keep getting back:
Uncaught TypeError: inputs.every is not a function at submitEnabler
Now, I could do something like this...
for (var i = 0; i < inputs.length; i++) { if ($(inputs[i]).hasClass('is_glowing_success')) { console.log('yes'); } else { console.log('no'); } }
But, why can't I just use: Array.Prototype.every() ?