检测用HTML格式target ="_ blank"和不同域打开的窗口关闭

Question

出于某些原因,我需要使用本机HTML表单属性target="_blank"在新窗口中显示表单响应.

我有以下HTML表单myDomain.com:

<form target="_blank" method="POST" action="http://www.anotherDomain.com/somePage">
  <input name="someFieldName" value="someValue"/>
  <button type="submit">Submit</button>
</form>

当用户单击时Submit,浏览器中将出现一个窗口/选项卡,我对表单响应没有访问控制权anotherDomain.com.

如何检测_blank窗户何时关闭？

window如果使用window.open(),我可以得到孩子的参考,但它不适合,因为它window.open()会被浏览器阻止.

Answer 1

这是我的解决方案：

<!-- set form target to a specific name -->
<form target="windowName" method="POST" action="http://www.anotherDomain.com/somePage">
  <input name="someFieldName" value="someValue"/>
  <button type="submit">Submit</button>
</form>

<script>
var childWindow;

$('form').get(0).onsubmit = function () {
  // I think why window.open() here would not be blocked by browser because the function is attached to the HTML DOM and the event is triggered by user (mouse click)
  childWindow = window.open('', 'windowName');
};

var checkWindowClose = setInterval(function () {
  if (childWindow.closed) {
    alert('Window is closed');
    clearInterval(checkWindowClose);
  } else {
    // check the URL if childWindow has been redirected to somewhere
    try {
      // cross-origin exception will occur if the URL is in different domain
      if (childWindow.document.URL == 'something') {
        // ...
        clearInterval(checkWindowClose);
      }
    } catch (err) {
      // just ignore the error and do nothing
    }
  }
}, 1000);
</script>