Allow field validation in ajax.

Friends,

The ajax codes below successfully save the records in the database without page loading. But what I want is to validate the fields first before saving. The codes do not validate the empty field. How can I include that validation ? please help

<script>

$(".submit_btn").click(function(){

var form=new FormData($("#ReportForm")[0]);

//AJAX CODE

var xhr=new XMLHttpRequest();

xhr.onreadystatechange=function(){

if(xhr.status==200){

console.log(xhr.responseText);

}

}

xhr.open("POST","{% url 'report_create' %}",true);

$("#progressbar").show();

//UPDATING PROGRESS BAR

xhr.upload.addEventListener("progress",function(ev){

if(ev.lengthComputable){

var percentage=(ev.loaded/ev.total*100|0);

$("#progressbar").css({"width":""+percentage+"%"}).text("Uploading .."+percentage+"%");

console.log(percentage);

if(percentage>=100){

location.reload()

}

}

});

xhr.send(form);

})

</script>

Regards,

Eugene

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