Bypass popup blocker on window.open when JQuery event.preventDefault() is set

问题

I want to show a JQuery dialog conditionally on click event of an hyperlink .

I have a requirement like on condition1 open a JQuery dialogue and if condition1 is not satisfied, navigate to the page as referenced by \'href\' tag of whose click event is in question.

I am able to call a function on link\'s click event. This function now checks the said condition by executing another URL (that executes my Spring controller and returns response).

All works perfect with only window.open being blocked by popup blocker.

$(\'a[href*=/viewpage?number]\').live(\'click\', function(e) {
    e.preventDefault();
    redirectionURL = this.href;
    pageId= getUrlVars(redirectionURL)[\"number\"];
    $.getJSON(\"redirect/\" + pageId, {}, function(status) {
        if (status == null) {
            alert(\"Error in verifying the status.\");
        } else if(!status) {
            $(\"#agreement\").dialog(\"open\");
        } else {
            window.open(redirectionURL);
        }
    });
});

If I remove e.preventDefault(); from code, popoup blocker doesn\'t block the page, however for condition1 it then opens the dialogue as well as opens the \'href\' page.

If I solve one, it creates issue for another. I am not able to give justice to both conditions simultaneously.

Could you help me solve this issue please?

Once this is solved I have another issue to solve i.e. navigation on dialogue\'s OK event :)

回答1:

Popup blockers will typically only allow window.open if used during the processing of a user event (like a click). In your case, you're calling window.open later, not during the event, because $.getJSON is asynchronous.

You have two options:

Do something else, rather than window.open.

Make the ajax call synchronous, which is something you should normally avoid like the plague as it locks up the UI of the browser. $.getJSON is equivalent to:

$.ajax({
  url: url,
  dataType: 'json',
  data: data,
  success: callback
});

...and so you can make your $.getJSON call synchronous by mapping your params to the above and adding async: false:

$.ajax({
    url:      "redirect/" + pageId,
    async:    false,
    dataType: "json",
    data:     {},
    success:  function(status) {
        if (status == null) {
            alert("Error in verifying the status.");
        } else if(!status) {
            $("#agreement").dialog("open");
        } else {
            window.open(redirectionURL);
        }
    }
});

Again, I don't advocate synchronous ajax calls if you can find any other way to achieve your goal. But if you can't, there you go.

Here's an example of code that fails the test because of the asynchronous call:

~~Live example | Live source~~ (The live links no longer work because of changes to JSBin)

jQuery(function($) {
  // This version doesn't work, because the window.open is
  // not during the event processing
  $("#theButton").click(function(e) {
    e.preventDefault();
    $.getJSON("http://jsbin.com/uriyip", function() {
      window.open("http://jsbin.com/ubiqev");
    });
  });
});

And here's an example that does work, using a synchronous call:

~~Live example | Live source~~ (The live links no longer work because of changes to JSBin)

jQuery(function($) {
  // This version does work, because the window.open is
  // during the event processing. But it uses a synchronous
  // ajax call, locking up the browser UI while the call is
  // in progress.
  $("#theButton").click(function(e) {
    e.preventDefault();
    $.ajax({
      url:      "http://jsbin.com/uriyip",
      async:    false,
      dataType: "json",
      success:  function() {
        window.open("http://jsbin.com/ubiqev");
      }
    });
  });
});

回答2:

you can call window.open without browser blocking only if user does directly some action. Browser send some flag and determine that window opened by user action.

So, you can try this scenario:

var myWindow = window.open('')

draw any loading message in this window

when request done, just call myWindow.location = 'http://google.com'

回答3:

I had this problem and I didn't have my url ready untill the callback would return some data. The solution was to open blank window before starting the callback and then just set the location when the callback returns.

$scope.testCode = function () {
    var newWin = $window.open('', '_blank');
    service.testCode().then(function (data) {
        $scope.testing = true;
        newWin.location = '/Tests/' + data.url.replace(/["]/g, "");
    });
};

回答4:

try this, it works for me,

$('#myButton').click(function () {
    var redirectWindow = window.open('http://google.com', '_blank');
    $.ajax({
        type: 'POST',
        url: '/echo/json/',
        success: function (data) {
            redirectWindow.location;
        }
    });
});

Is fiddle for this http://jsfiddle.net/safeeronline/70kdacL4/1/

回答5:

Windows must be created on the same stack (aka microtask) as the user-initiated event, e.g. a click callback--so they can't be created later, asynchronously.

However, you can create a window without a URL and you can then change that window's URL once you do know it, even asynchronously!

window.onclick = () => {
  // You MUST create the window on the same event
  // tick/stack as the user-initiated event (e.g. click callback)
  const googleWindow = window.open();

  // Do your async work
  fakeAjax(response => {
    // Change the URL of the window you created once you
    // know what the full URL is!
    googleWindow.location.replace(`https://google.com?q=${response}`);
  });
};

function fakeAjax(callback) {
  setTimeout(() => {
    callback('example');
  }, 1000);
}

Modern browsers will open the window with a blank page (often called about:blank), and assuming your async task to get the URL is fairly quick, the resulting UX is mostly fine. If you instead want to render a loading message (or anything) into the window while the user waits, you can use Data URIs.

window.open('data:text/html,<h1>Loading...<%2Fh1>');

回答6:

This code help me. Hope this help some people

$('formSelector').submit( function( event ) {

    event.preventDefault();

    var newWindow = window.open('', '_blank', 'width=750,height=500');

    $.ajax({

        url: ajaxurl,
        type: "POST",
        data: { data },

    }).done( function( response ) {

        if ( ! response ) newWindow.close();
        else newWindow.location = '/url';

    });
});

回答7:

Try using an a link element and click it with javascriipt

<a id="SimulateOpenLink" href="#" target="_blank" rel="noopener noreferrer"></a>

and the script

function openURL(url) {
    document.getElementById("SimulateOpenLink").href = url
    document.getElementById("SimulateOpenLink").click()
}

Use it like this

//do stuff
var id = 123123141;
openURL("/api/user/" + id + "/print") //this open webpage bypassing pop-up blocker
openURL("https://www.google.com") //Another link

回答8:

The observation that the event had to be initiated by the user helped me to figure out the first part of this, but even after that Chrome and Firefox still blocked the new window. The second part was adding target="_blank" to the link, which was mentioned in one comment.

In summary: you need to call window.open from an event initiated by the user, in this case clicking on a link, and that link needs to have target="_blank".

In the example below the link is using class="button-twitter".

$('.button-twitter').click(function(e) {
  e.preventDefault();
  var href = $(this).attr('href');
  var tweet_popup = window.open(href, 'tweet_popup', 'width=500,height=300');
});

回答9:

var url = window.open("", "_blank");
url.location = "url";

this worked for me.

回答10:

I am using this method to avoid the popup blocker in my React code. it will work in all other javascript codes also.

When you are making an async call on click event, just open a blank window first and then write the URL in that later when an async call will complete.

const popupWindow = window.open("", "_blank");
popupWindow.document.write("<div>Loading, Plesae wait...</div>")

on async call's success, write the following

popupWindow.document.write(resonse.url)

来源：https://stackoverflow.com/questions/9514698/bypass-popup-blocker-on-window-open-when-jquery-event-preventdefault-is-set

标签

jquery

window.open

jquery-callback

popup-blocker