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Start your free trialAshley Campbell
Front End Web Development Techdegree Graduate 21,004 PointsThe :checkbox If statement
Was thinking about the condition of the 'if' statement in this video that Treasure uses which was...
if ($(':checked').length === 0) { event.preventDefault(); alert('please check the box!') }
Rather than comparing :checked.length to 0, would there be a way of comparing the value of the checkbox instead? as in something like....
if ($(':checked').val() === 'false')....... ??
Was thinking this would be more reliable than comparing the length of 2 arrays?
Thanks for any feedback!
1 Answer
Steven Parker
231,236 PointsI don't know what you mean by "2 arrays", but the original test determines if there are no checked elements on the page. And in that state, the result of "val" on the empty list would be undefined, not 'false'.
The method shown is perfectly reliable when there is only one checkbox on the page. But to improve it to work even if there are others (in various checked states), I might do something like this:
if (!$(event.target).prop("checked")) // test if this specific element is not checked
Ashley Campbell
Front End Web Development Techdegree Graduate 21,004 PointsAshley Campbell
Front End Web Development Techdegree Graduate 21,004 PointsOh so checkboxes don't have values!? So when a checkbox is 'checked' it's property changes to 'checked' rather than it's value changing to true?
Thanks again Steven
Steven Parker
231,236 PointsSteven Parker
231,236 PointsThe checkbox has a property named "checked" that will be either true or false. That's what my sample code is testing.