Introduction to usage examples of confirm pop-up box in JSF_javascript skills

Copy code The code is as follows:

function checkInput(objectSource) {
if(objectSource.onclick) {
objectSource.oldOnClick = objectSource.onclick;
objectSource.onclick = null;
}

var attachfile = $('#attachment').val();
if (content.indexOf("Attachment") != -1 && attachfile == undefined) {
if(!confirm( 'Your email content mentions attachments, but you may have forgotten to add them.')){
return false;
}
}
objectSource.oldOnClick();
}