python - Detecing forms (and filling them in) with Scrapy -


i'm struggling find generic approach detecting form in html , submitting it. when page structure know in advance given page, of course have several options:

-- selenium/webdriver (by filling in fields , 'clicking' button)

-- determining form of post query manually, reconstructing urllib2 directly:

import urllib2 import urllib import lxml.html lh  url = "http://apply.ovoenergycareers.co.uk/vacancies/#results" params = urllib.urlencode([('field_36[]', 73), ('field_37[]', 76),    ('field_32[]', 82)]) response = urllib2.urlopen(url, params)

or requests:

import requests r = requests.post("http://apply.ovoenergycareers.co.uk/vacancies/#results", data = 'manager') r.text

but although forms involve post request, input fields , submit button, vary in implementation under hood. when number of pages scraped gets hundreds, it's not feasible define custom form-filling approach each.

my understanding scrapy's main added value ability follow links. presume include links arrived @ via form submission. can ability used build generic approach "following" form submission?

clarification: in case of form several dropdown menus, typically leaving these @ default value, , filling in search term input field. locating field , 'filling in' main challenge here.

link extractors cannot follow form submissions in scrapy. there mechanism called formrequest designed ease submitting forms.

note formrequests cannot handle forms when javascript involved in submission.


Comments

Post a Comment

Popular posts from this blog

javascript - jQuery: Add class depending on URL in the best way -

i have html progress meter: <div class="col-md-3" style="margin-left: -20px;"> <div class="progress-pos active" id="progess-1"> <div class="progress-pos-inner"> login </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-2"> <div class="progress-pos-inner"> scan items </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-3"> <div class="progress-pos-inner"> confirm address </div> </div> </div> <div class="col-md-3 progress-pos-container"> <div class="progress-pos" id="progess-4"> <div class="progress-pos-in...
Read more

caching - How to check if a url path exists in the service worker cache -

i need check if particular url path exists in service worker cache. example, suppose url is: /myserviceworker/service?a=110&b=70 this url exists in cache, there many of them different values of , b. now, suppose want refresh of these urls, how can that? i want know how access key values service worker cache. if know key, plan follows: var url = new url(key); if(url.pathname === "\/myserviceworker/service") refetch key but not sure how cache key , in format is. mean, string or url? cache api has match() method returns promise resolving in response object if match or undefined if no match exists. second parameter object can specify ignoresearch not take account url parameters. the ignoresearch option supported firefox ( chrome status here ). in other hand, retrieve cache entries, can use keys() method.
Read more

Redirect to a HTTPS version using .htaccess -

i need modify .htaccess file redirect urls https version without "www". http://example.com --> https://example.com http://www.example.com --> https://example.com https://www.example.com --> https://example.com this how .htaccess file looks like: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^(.*)$ redirect.php?id=$1&page=$2 [qsa,l] what modifications need make .htaccess in order forward https without "www"? it depends on doing current code. looks file called redirect trying display php page seo friendly url. think might confusing people. anyway, need , force https without www, need 1 more rule above. also second rule needs two capture groups in rewriterule test string because wanting 2 different values using $1 , $2 references. rewriteengine on #rediect www non www and/or http https --- combinations. rewritecond %{http_host} !^example\.com [nc,or] rewritecond %{https} !^...
Read more