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The issue of substituting one’s own ‘alert’ by contriving a jQuery dialog has been debated previously, for instance here :

Custom alert and confirm box in jquery

In that thread Hemant Malpote objected rightly: « But it [the proposed jQuery dialog-based solution] doesn't block the code. [where]As statement[s] after [a Javascript] alert get execute[d] only when 'Ok' [is] press[ed] ». (Letters or words inside brackets were added by me for the sake of clarity.) I should add that this can wholly change the behaviour of a chunk of code.

How can I design a jQuery dialog so that it behaves the way the Javascript alert does, i.e. stops executing until a dismissal button gets pressed ?

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    think differently and wrap whatever you need to execute in a promise callback and resolve that promise with dialog button Commented May 15, 2016 at 14:38
  • You can use sweet alert at here limonte.github.io/sweetalert2 Commented May 15, 2016 at 14:40
  • Thanks to charlietfl and Fil. I have heard about SweetAlert and am going to give it a go. Commented May 15, 2016 at 15:08
  • @Fil — I have just tested SweetAlert, not thourougly, I confess. Implementing their test code junk —swal({ title: "Error!", text: "Here's my error message!", type: "error", confirmButtonText: "Cool" });— in my own code shows that their 'alert' behaves exactly as a jQuery dialog. Am I missing something? Any clue? Commented May 15, 2016 at 15:34
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    @charlietfl — I think that is the right thing to do —and I did so—, at least as far as my specific problem needed to be solved: the deferring device works smoothly, is easy to implement and apparently sports many extended possibilities. Cheers ! Commented May 17, 2016 at 4:50

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You can't.

The closest you can come is to cancel whatever triggered it entirely, and then start something new (but similar to what you canceled) when the button is clicked.

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Please see my reply to charlietfl. Though you are quite right, the deferring device is a good workaround.
@BriceCoustillas — That's more or less what this answer is suggesting.

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