javascript - Why do developers write these type of scripts for embedding when a simple tag would do? -

-

i wanted ask question practice have seen quite lot regarding jquery/javascript plugins/widgets written other developers.

i maintain number of sites , asked add new scripts various things such chat widgets, marketing tools etc etc code sent majority of these looks this.

<script type="text/javascript">  (function() {  var hm = document.createelement('script'); hm.type ='text/javascript';     hm.async = true;  hm.src = ('++www-widget-org+widget-js').replace(/[+]/g,'/').replace(/-/g,'.');  var s = document.getelementsbytagname('script')[0];     s.parentnode.insertbefore(hm, s);  })();  </script>

now question why go trouble of writing above script when need this?

<script src="//www.widget.org/widget.js" type="text/javascript" async></script>

i have seen number of times , beginning wonder benefit of approach is? if there one?

according steve souders, method used load scripts in non-blocking fashion. makes sense given these scripts supplemental page , not directly related function (why make site slow because added google analytics, etc.).

there's other scripts use opportunity initialize basic data (e.g. googleanalytics uses _setaccount). i've seen scripts aggregate user statistics (screen size, agent, , other client data) , pass them off remote script (in query parameters can later review/analyze gain detail demographic).


Comments

Post a Comment

Popular posts from this blog

html - Firefox flex bug applied to buttons? -

-
i'm trying apply flex button on firefox i'm having problem on chrome doesn't happens. this css: .button { display: inline-flex; align-items: center; } as can see in fiddle, "caret" word moved new line, happens if element <button> tag, <div> works expected. http://codepen.io/anon/pen/xblmgx is firefox bug or there css i'm missing? nevermind, looks "mr firefox" doesn't idea... <button> not implementable (by browsers) in pure css, bit of black box, perspective of css. means don't react in same way e.g. <div> would. this isn't specific flexbox -- e.g. don't render scrollbars if put "overflow:scroll" on button, , don't render table if put "display:table" on it. stepping further, isn't specific <button> . consider <fieldset> , <table> have special rendering behavior: data:text/html,<fieldset style="d...
Read more

html - Missing border-right in select on Firefox -

-
Image
when put select div width , padding-left, options have no border on right. more, happend if select have width 118px , parent have 15px of padding left! have idea, going on? my code: <!doctype html> <html> <head lang="en"> </head> <body> <div style="width: 1000px; padding-left: 15px;"> <select style="width: 118px;"> <option>a</option> <option>b</option> <option>c</option> </select> </div> </body> </html> and result: here plunker: click it happend on firefox on windows. tested on 40.0.2 version -webkit-box-sizing: border-box; -moz-box-sizing: border-box; -ms-box-sizing: border-box; box-sizing: border-box; source: https://stackoverflow.com/a/11390432/4431269 source of problem: https://bugzilla.mozilla.org/show_bug.cgi?id=924068 and use of google ! edit: (source of problem, explained) after rea...
Read more

python - build a suggestions list using fuzzywuzzy -

-
i building suggestion engine database. i'm using fuzzywuzzy module match user input string existing database shown below. if request.method == "get": display_dict = {} user_input = request.get["user_input"] # user input match_dict = {} food_items_obj = food_items.objects.all() # fetch objects table items in food_items_obj : match = fuzz.ratio(user_input.lower(),items.name.lower()) # try match user input existing names match_dict[match] = items.name # put 1 dictionary matched_dict = ordereddict(sorted(match_dict.items(),reverse = true)) # sort dictionary if max(matched_dict.keys()) == 100: # if exact match put in dict , return display_dict[100] = matched_dict[100] else : # if not found try best matching words.. ###########this part need help! ############# k,v in matched_dict.items(): if user_input in v : display_dict[k]...
Read more