javascript - How to store and update a localStorage key object which has properties of different data types? -


this first time using localstorage , store localstorage key object has properties of different data types ,for example key "localstor" ,it object containing 2 properties : 

localstor= { usermsg : string , userinfo : (object) { id: string , username: string , pwd :string } }

the property usermsg of type string while property userinfo of type object.

i know how set , item containing objects based on this question , in case don't know how set , kind of key? , espacially if want update object userinfo in localstor how that?

any appreciated.

i don't know if understood question, , if did, please tell me can correct answer, think trying manipulate item kept in cache localstorage, , data, instance, object contains data of multiple types.

lets have object localstor (i added tabs it's easier see , debug);

var localstor = {   usermsg : "message",   userinfo :{               id: "someid",               username: "someusername",               pwd : "somepassword"             } }

putting localstorage super easy (as pointed out know how do) need choose key. here, chose "obj" key:

localstorage.setitem("obj", json.stringify(localstor));

as might have noticed, used function json.stringify(). did because since have object objects inside, need convert string store it. javascript has function built-in don't need install anything.

how retrieve , update localstor object now?

very easy. retrieve object localstorage.getitem() function, passing "obj" have setted before, , result need convert object type (since stored string before, remember?) using json.parse() function. after that, can edit properties of object other object:

localstor = json.parse(localstorage.getitem("obj")); localstor.userinfo.username = "anotherusername";

i can set new object localstorage:

localstorage.setitem("obj", json.stringify(localstor));

and that's it! when retrieve again, new value username there.

full code here:

var localstor = {       usermsg : "message",       userinfo :{                   id: "someid",                   username: "someusername",                   pwd : "somepassword"                 }     }      //put localstor object cache     localstorage.setitem("obj", json.stringify(localstor));       //retrieve object     localstor = json.parse(localstorage.getitem("obj"));     //change username property     localstor.userinfo.username = "anotherusername";      //and put editted object cache     localstorage.setitem("obj", json.stringify(localstor));

if have doubts yet, please tell me can answer in better way!


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer ...
Read more

c# - Asp.net web api : redirect unauthorized requst to forbidden page -

im trying redirect unauthorized request forbidden page instead i'm getting forbidden page in response body , how can fix ? here's startup class : app.createperowincontext(storecontext.create); app.createperowincontext<applicationusermanager>(applicationusermanager.create); app.createperowincontext<applicationsigninmanager>(applicationsigninmanager.create); app.usecookieauthentication(new cookieauthenticationoptions { authenticationtype = defaultauthenticationtypes.applicationcookie, expiretimespan = timespan.fromdays(30), }); app.useexternalsignincookie(defaultauthenticationtypes.externalcookie); app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5)); app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie); the method im trying reach : [httpget] [authorize(roles = "admin")] public string getcurrentusername() { return userman...
Read more