Checkbox always returns false when I do .is (": checked");

Question

Checkbox always returns false when I do .is (": checked");

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#1 by (2 votes)

-2

Code is this:

<script>
$(document).ready(function () {
    alert("funfo");
    $("#segunda").click(function () {
        var check = $("#segunda").is(":checked");
        if (check == "true") {
            alert("true");
        } else {
            alert("false");
        }
        alert(check);
    });
});
</script>

Problem is, the guy selects the checkbox, returns false , it unchecks, returns false .. being true returns when the box is selected, and false when deselected ..

I've used alert(check); and it returns true , and false , for checked and unchecked, exactly as it was to do, but in checking IF it always returns an option, which in this case is false ..

javascript

asked by anonymous 03.11.2014 / 01:14

1 answer

How can I download PDF from a web page automatically Someone help me something is wrong here has 3 mistakes and I do not know how to get them! C # [closed]

score 2 · Accepted Answer

$(document).ready(function () {
    alert("funfo");
    $("#segunda").click(function () {
        var check = this.checked;
        if (check) alert("true");
        else alert("false");
        alert('O valor do check é: ' + check);
    });
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script><inputtype="checkbox" id="segunda" />

When you use .is(":checked") this will return a Boolean. That is true or false . In your comparison you compare with "true" . When using quotes it is using the String type and not Boolean. So the comparison should be if (check == true){ . In fact this comparison is unnecessary, just make if (check){ .

Another thing that can change (and I changed the code in the response example) is that it does not need $("#segunda").is(":checked") , you can use pure JavaScript without jQuery, (this.checked) since it is looking for checked of the element that was clicked. (The less jQuery the better ...).