如何覆盖javascript库函数？

Question

I am using Bootstrap datepicker library inside my Symfony application. I would like to overwrite the function updateNavArrows inside bootstrap-datepicker.js by removing/commenting line 1132 and 1142 so the prev cursor which currently disappears(when I am on the page with the startDate as today) will always be present. Is there a better way of achieving this without having to modify the original source code?

PS: I tried to implement the changes using this answer but it doesn't seem to work.

Answer 1

as you can see in the source code here they just remove or add a disabled class to the next and prev buttons

this.picker.find('.prev').toggleClass('disabled', prevState);
this.picker.find('.next').toggleClass('disabled', nextState);

this disabled class just puts the visibility of the button to hidden as you can see here

.prev, .next {
    &.disabled {
        visibility: hidden;
    }
}

so overriding the css style to set visibility:visible should work

Answer 2

I have seen something like this before, hope this will help you.

var RealupdateNavArrows = updateNavArrows;
    updateNavArrows = function() {
         alert("function overrided");
         return RealupdateNavArrows();
    }