javascript - How update html img src from spring controllers method? -

-

i add capcha jsp page (kaptcha library). this

@requestmapping(value = "/captcha.jpg", method = requestmethod.get)     public void captcha(httpservletrequest req, httpservletresponse resp) throws servletexception, ioexception {         super.captcha(req, resp);     }

and in page

<img src="captcha.jpg"/>

now need create button update captcha.(or when clik captcha image)

i tried this

<a href="captcha.jpg">             <img src="captcha.jpg"/>             </a>

but when click image open singly. need refresh captcha image after click.

maybe javascript, maybe else? how it?

update

i create 

<script>                 function update() {                     document.getelementbyid('my-image').setattribute('src', "captcha.jpg");                 }             </script>             <a href="" onclick="update()">                 <img src="captcha.jpg" id="my-image"/>             </a>

it work after img update page scroll up. how can fix it?

your page scrolling because default behavior of anchor tag scroll top unless give url, element scroll to, or javascript: statement.

to fix it, either put javascript: inside the href of anchor tag, or remove anchor tag , put onclick event on image this:

<img src="captcha.jpg" id="my-image" onclick="update()" />

Comments

Post a Comment

Popular posts from this blog

Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

-
i have following viewset: class artistprofileviewset(viewsets.modelviewset): queryset = artistprofile.objects.all() serializer_class = artistprofileserializer def perform_create(self, serializer): if serializer.is_valid(): serializer.save() with following serializers: class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer): class meta: model = artisttrack fields = (...my fields...) class artistprofileserializer(serializers.hyperlinkedmodelserializer): owners = userserializer(many=true, required=false) tracks = simpleartisttrackserializer(many=true, required=false) class meta: model = artistprofile fields = (...my fields...) i getting following error: assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead. i don't see editing serializer.data object. th...
Read more

Why does Go error when trying to marshal this JSON? -

-
i'm trying rather simple example of trying decode json file structs using golang. however, when attempting error that json: cannot unmarshal object go value of type []main.track which don't understand. here's code in question, , json can found here . package main import ( "encoding/json" "fmt" "net/http" "os" ) // tracks group of track types type tracks struct { tracks []track } // track represents singular track type track struct { name string url string artist artist } // artist represents single artist type artist struct { name string mbid string url string } func main() { url := "http://ws.audioscrobbler.com/2.0/?method=geo.gettoptracks&api_key=c1572082105bd40d247836b5c1819623&format=json&country=netherlands" response, err := http.get(url) if err != nil { fmt.printf("%s\n", err) os.exit(1) } de...
Read more