Error in Sending form data to Django views through AJAX - json

Question

I have a HTML form, which takes in input from the user. On clicking the submit button, form data needs to be sent to the views.py in a JSON format, through AJAX. I tried out something, but I am getting an error the JSON object must be str, not 'NoneType' . The JSON data is being loaded in the views.py through:
form = json.loads(request.POST.get('form'))
The data is returned in form of a dictionary called 'searchdata'.
The form:
<form method="POST" id="inputForm">
<div class="container" style="margin-bottom: 50px;width:100%">
<div class="container-fluid mt-3">
<div class="card" id="statform">
<div class="card-header">
<div class="card-title">
<div style="font-size: 25px">Filter</div>
</div>
</div>
<br>
<div class="card-body">
<div class="row">
<div class="col-xs-6">
<div class="col-xs-6">
<label name="start_date" class="control-label" style="width:35%">Start date</label>
<input type="date" id="start_date" style="color:black;width:100px" ></input>
</div>
</div>
<div class="col-xs-6">
<label name="end_date" class="control-label" style="width:35%">End Date(Default: Current Date)</label>
<input style="color:black;width:100px" id="end_date" type="date"></input>
</div>
</div>
<br>
<div class="row">
<div class="col-xs-6">
<label name="fruit_name" class="control-label" style="width:35%; padding-left:15px">Select a Fruit</label>
<select class="js-example-placeholder-single1 js-example-basic-multiple form-control" id="fruit_name" placeholder="Select" style="width:210px" multiple="multiple">
</select>
</div>
<div class="col-xs-6">
<label name="vendor_test" class="control-label" style="width:35%">Select Vendor_TEST</label>
<select class="js-example-placeholder-single2 js-example-basic-multiple form-control" style="width:210px" id="vendor_test" multiple="multiple">
</select>
</div>
</div>
<div class="row">
<div class="col-xs-6">
<label name="release_version" class="control-label" style="width:35%; padding-left:15px">Select Release version</label>
<select class="js-example-placeholder-single3 js-example-basic-multiple form-control" style="width:210px" id="release_version" multiple="multiple">
</select>
</div>
<div class="col-xs-6">
<label class="control-label" style="width:35%">Error Message</label>
<input type="text" placeholder="Type message here" style="width:210px">
</div>
</div>
<div class="row">
<div class="col-xs-6">
<label class="control-label" style="width:35%; padding-left:15px">Error Message List</label>
<select class="js-example-placeholder-single4 js-example-basic-multiple form-control" style="width:210px" id = "error_message" multiple="multiple">
</select>
</div>
</div>
<div class="text-center">
<button class="btn btn-md btn-default" type="submit" name="search" value="search" onclick="loadResults()">
<i class="fa fa-arrow-circle-right"></i> Submit
</button>
<button class="btn btn-md btn-default" type="reset" name="searchreset" value="reset">
<i class="fa fa-arrow-circle-right"></i> Reset
</button>
</div>
</div>
</div> <!--form-->
</div> <!-- row -->
</div> <!--container main-->
</form>
The AJAX call I have written:
$.ajax({
url : window.location.href,
type : 'POST',
cache : false,
data:{form:JSON.stringify(formdata)},
success:function(res){
if(typeof res.searchdata != 'undefined'){
self.$dispatch('searchdataevent',res.searchdata);
}
if(typeof res.message != 'undefined'){
self.message = res.message;
}
self.loading = false;
},
error : function(err){
self.message = 'Error communicating with server';
self.loading = false;
}
});
Where am I going wrong? Any help is appreciated.