How can the automatic selection of the window that opened a JavaScript popup be utilized in PHP for passing variables?

To utilize the automatic selection of the window that opened a JavaScript popup in PHP for passing variables, you can use the window.opener property in JavaScript to pass data from the popup window back to the parent window. This can be achieved by setting a variable in the parent window using window.opener.variableName = value in the popup window. 

// Parent window
<script>
function openPopup() {
    var myVar = 'Hello from parent window';
    var popup = window.open('popup.html', 'Popup', 'width=200,height=200');
}
function receiveData(data) {
    alert(data);
}
</script>

// Popup window
<script>
window.opener.receiveData('Data from popup window');
</script>

Keywords

JavaScript popup window selection PHP passing variables automatic detection

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