creating the alert() method without the display - javascript

Question

is there a way that I can duplicate what the alert() function does, without the popup?? This might seem mad but there is good cause for this.

EDIT

Here is my code:

var navActive;
var pageID;
var maxNav;
var popWidth = $(window).width();
var popHeight = $(window).height();

function thread_start(callback) {

   setTimeout(callback, 1);
   return true;
}

(function($){

$.fn.foneySlide = function ( options ) {

    $(window).resize(function(){
        popWidth = $(window).width() - 40;
        popHeight = $(window).height() - 40;
    })

    opt = $.extend ({ popOnTransition : true }, options);

    // firstly give all navigation items a position reference for continous slide
    $('[data-role=page]').each(function(i){
        $(this).attr('navpos', i );
        if( typeof $('[data-role=page]')[i+1] == 'undefined' ) {
            maxNav = i;
        }
    });

    // get the current active page and the default navigation position
    pageID = $('.ui-page-active').attr('id');
    navActive = $('#' + pageID).attr('navpos');

    // change page on swipe left       
    $('body').bind('swipeleft', function(e){
        if( navActive == maxNav ) {
            navActive = 0;
            alert();
            thread_start("$.mobile.changePage($('[navpos=0]'), 'slide', false, true)");
        }else{
            navActive = Number(navActive + 1);
            alert();
            thread_start("$.mobile.changePage($('[navpos=' + navActive  + ']'), 'slide', false, true)");
        }
    });

    // change page on swipe right                
    $('body').bind('swiperight', function(e){
        if( navActive == 0 ) {
            navActive = maxNav;
            alert();
            thread_start("$.mobile.changePage($('[navpos=' + navActive + ']'), 'slide', true, true)");
        }else{
            navActive = Number(navActive - 1);
            alert();
            thread_start("$.mobile.changePage($('[navpos=' + navActive  + ']'), 'slide', true, true)");
        }
    }); 
}

})(jQuery);

remove the alerts and it starts to freeze.

Assuming that all an alert does is display a popup, I wonder what would be the expected result if you don't want the popup. It's like taking the sun away from a summer holiday. You are left with, nothing :-) — Darin Dimitrov, Jun 09 '11 at 11:31
Thats a good question. I'm creating a mobile page slider plugin for small websites on mobile devices that do not need a navigation (because of space) so they can siomply slide finger across to go to next page. The jqueryMobile $.mobile.ChangePage() function freezes on most devices and does not work once the user has scrolled down (from what I have tested). If I stick alert() beforehande after the slideLeft event is triggered and I close the alert box everything slides nicely. — Phil Jackson, Jun 09 '11 at 11:34
So I wonder what the alert() function does behind the scenes. — Phil Jackson, Jun 09 '11 at 11:36
@Phil, that is using a sideeffect of something completely unrelated to hack something not working in your app. You should a) fix the script and b) tell jQuery mobile if you are certain you found a bug — mplungjan, Jun 09 '11 at 11:39
So we now understand that Phil just wants to block the script for a millisecond. — mplungjan, Jun 09 '11 at 11:48
This is a good question, I would really like to know what window.alert() does behind the scenes. — ModusPwnens, Sep 16 '16 at 14:30

score 0 · Answer 1 · edited May 23 '17 at 10:33

0

There is only one single use for alert, and that is showing a popup, so I wonder what that cause is. .. :)

But it is possible, as demonstrated here on SO.

function alert(msg)
{
  // Ignore
}

edited May 23 '17 at 10:33

Community

1
1

answered Jun 09 '11 at 11:30

GolezTrol

114,394
18
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I think it is as easy as the sample I've just added. The global context in javascript is actually inside the window object, so redeclaring the alert function will override it. – GolezTrol Jun 09 '11 at 12:49
But if you get specific errors it would be helpful if you posted your code and the errors you're getting. – GolezTrol Jun 09 '11 at 12:49

score 0 · Answer 2 · answered Jun 09 '11 at 11:44

I don't know if this is what you are after but I use firebug and the console.log call a lot to get information about what the javascript is doing without interfering with the site flow.

remember however to bypass the console.log method if it is a live site as anyone without firebug will receive errors.

if(typeof console == 'undefined') {
    console = function(){}
    console.log = function(txt){}
    console.warn = function(txt){}
} else console.log('Console Active');

Get Firebug site

score 0 · Answer 3 · answered Jun 09 '11 at 11:50

Reading your comments but not knowing your code, is this what you are trying to achieve?

before:

function something() {
  a();
  b(); // needs a pause before executing c()
  c();
}

after:

function something() {
  a();
  b(); // needs a pause before executing c()
  setTimeout(c,10);
}

score -1 · Answer 4 · answered Jun 09 '11 at 11:38

-1

window.alert = function(text) { }

answered Jun 09 '11 at 11:38

J.C. Inacio

4,442
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creating the alert() method without the display - javascript

4 Answers4