Scrapy - Javascript website

Asp.net websites are notoriously hard to crawl because it relies on viewsessions, being extremely strict with requests and loads of other nonsense.

Luckily your case seems to be pretty straightforward. Your scrapy approach should look something like:

import scrapy
from scrapy import FormRequest

class MxindiaSpider(scrapy.Spider):
    name = "mxindia"
    allowed_domains = ["mcxindia.com"]
    start_urls = ('http://www.mcxindia.com/SitePages/BhavCopyDateWiseArchive.aspx',)

    def parse(self, response):
        yield FormRequest.from_response(response,
                                        formdata={
                                            'mTbdate': '02/13/2015',  # your date here
                                            'ScriptManager1': 'MupdPnl|mImgBtnGo',
                                            '__EVENTARGUMENT': '',
                                            '__EVENTTARGET': '',
                                            'mImgBtnGo.x': '12',
                                            'mImgBtnGo.y': '9'
                                        },
                                        callback=self.parse_cal, )

    def parse_cal(self, response):
        inspect_response(response, self)  # everything is there!

What we do here is create FormRequest from the response object we already have. It's mart enough to find the <input> and <form> fields and generates formdata. However some input fields that don't have defaults or we need to override the defaults need to be overriden with formdata argument. So we provide formdata argument with updated form values. When you inspect the request you can see all of the form values you need to make a successful request:

So just copy all of them over to your formdata. Asp is really anal about the formdata so it takes some time experimenting what is required and what is not.

I'll leave you to figure out how to get to the next page yourself, usually it just adds aditional key to formadata like 'page': '2'.