How I enable popup in firefox version 51

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I used this javascript function to show popup window but it is working on firefox version 27 but when i update firefox to version 51 it is not working

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java script code
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function ShowDialog() {

var rtvalue = showModalDialog("AdmissionRegPopup.aspx", "sss", "dialogWidth:800px; dialogHeight:550px; dialogLeft:250px;");
document.getElementById("ctl00_ContentPlaceHolder1_txtreg").value = rtvalue.NameValue;

}

What I have tried:

function ShowDialog() {

var rtvalue = showModalDialog("AdmissionRegPopup.aspx", "sss", "dialogWidth:800px; dialogHeight:550px; dialogLeft:250px;");
document.getElementById("ctl00_ContentPlaceHolder1_txtreg").value = rtvalue.NameValue;

}

Posted 8-Feb-17 1:33am

Sankar Prosad Roy

Updated 8-Feb-17 2:08am

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Jochen Arndt · Accepted Answer · 2017-02-08T02:08:00

That is because that function is deprecated and has been removed for recent browsers. See Window.showModalDialog() - Web APIs | MDN[^].

For alternatives read the "See Also" section at the above link and search for "javascript showmodaldialog replacement" or "javascript showmodaldialog alternative".