alert not working in Chrome

Question

nuff said  I have absolutely no clue why using alert   there wouldn t work  It works perfectly in Firefox  but gives that error in Chrome

User · Answer

Here is a snippet that does not need ajQuery and will enable alerts in a disabled iframe (like on codepen)

for (var i = 0; i < document.getElementsByTagName('iframe').length; i++) {
    document.getElementsByTagName('iframe')[i].setAttribute('sandbox','allow-modals');
}

Here is a codepen demo working with an alert() after this fix as well: http://codepen.io/nicholasabrams/pen/vNpoBr?editors=001

User · Answer

I had the same issue recently on my test server   After searching for reasons this might be happening and testing the solutions I found here  I recalled that I had clicked the  Stop this page from creating pop-ups  option a few hours before when the script I was working on was wildly popping up alerts     The solution was as simple as closing the tab and opening a fresh one

User · Answer

put this line at the end of the body  May be the DOM is not ready yet at the moment this line is read by compiler    lt script type  text javascript  src  script js  gt  lt  script gt

User · Answer

Take a look at this thread  http   code google com p chromium issues detail id 4158     The problem is caused by javascript   method  window open URL  windowName      windowFeatures      If the 3rd   parameter windowFeatures is specified    then alert box doesn t work in the    popup constrained window in Chrome    here is a simplified reduction       http   go reductions 4158 test-home-constrained html      If the 3rd parameter windowFeatures is   ignored  then alert box works in the   popup in  Chrome the popup is actually   opened as a new tab in Chrome   like   this       http   go reductions 4158 test-home-newtab html      it doesn t happen in IE7  Firefox3 or   Safari3  it s a chrome specific issue       See also attachments for simplified   reductions

User · Answer

window alert   null  alert  test       fail delete window alert     true alert  test       win   window is an instance of DOMWindow  and by setting something to window alert  the correct implementation is being  shadowed   i e  when accessing alert it is first looking for it on the window object  Usually this is not found  and it then goes up the prototype chain to find the native implementation  However  when manually adding the alert property to window it finds it straight away and does not need to go up the prototype chain  Using delete window alert you can remove the window own property and again expose the prototype implementation of alert  This may help explain   window hasOwnProperty  alert       false window alert   null  window hasOwnProperty  alert       true delete window alert  window hasOwnProperty  alert       false

[javascript] alert() not working in Chrome

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