GWT JSNI - Java To Javascript Back To Java Results in undefined params -


i have racked brain on better part of 2 days. i've read through documentation on jsni here few different blog posts on jsni , passing variables this one , nothing indicates i'm doing wrong. i'm trying call gwt client side class javascript method i'm exporting javascript class loads. method takes params js method , stores them on instance of java class passed. seems work. but, once reference methods in java code, they're undefined. believe happening java class instance getting lost somehow after js finishes. here's code explain workflow...

i have java class named profilewidgee. class has method set local variables location, lattitude, , longitude. method name is...

public void handletargetpicked(string mloc, string mlat, string mlng)  {     loc = mloc.equalsignorecase("undefined") ? "" : mloc;     lat = mlat.equalsignorecase("undefined") ? "" : mlat;     lng = mlng.equalsignorecase("undefined") ? "" : mlng;     window.alert("setting on js side" + loc + lat + lng); }

that method gets exported js function using jsni method called exportmyfunction...

public static native void exportmyfunction(profilewidgee instance)/*-{    $wnd.handletargetpicked = $entry(       instance.@com.n.j.client.widgees.profile.profilewidgee::handletargetpicked(ljava/lang/string;ljava/lang/string;ljava/lang/string;));  }-*/;

that seems go fine. exports , i'm able call handletargetpicked in js follows... 

handletargetpicked(encodeuricomponent(place.formatted_address),      encodeuricomponent(place.geometry.location.lat()),     encodeuricomponent(place.geometry.location.lng()));

all of seems work , window.alert() displays correct values. leads me believe has appropriate instance of class , setting variables appropriately. later on though i'm in java class, try , reference variables , come 'undefined.' 

window.alert("reading on java side" + pw.getloc() + pw.getlat() + pw.getlng());

this results in 'undefined' 3 values. big question ... possible set value in java class js side , use value later in class?

i ran similar situation , happened see post. couldn't see solutions suggested anywhere, tried debug myself.

what saw was, 'this' variable pointing window rather object instance.

so rather calling method directly e.g. handletargetpicked(arg1, arg2), used method.call() passing context e.g. handletargetpicked.call(instance, arg1, arg2). kind of approach solved issue me. hope helps.


-

Comments

Post a Comment

Popular posts from this blog

angular - Is it possible to get native element for formControl? -

i've got angular2 reactive form . created formcontrol s , assigned input fields by [formcontrol]=... . understand creates nativeelement <-> formcontrol link. my question: possible nativeelement formcontrol ? wanna myformcontrol.nativeelement.focus() i can share 1 terrible solution works me. in reactive forms can use either 1) formcontroldirective ts mycontrol = new formcontrol('') template <input type="text" [formcontrol]="mycontrol"> or 2) formcontrolname ts myform: formgroup; constructor(private fb: formbuilder) {} ngoninit() { this.myform = this.fb.group({ foo: '' }); } template <form [formgroup]="myform"> <input type="text" formcontrolname="foo"> </form> so these directives write patch like 1) formcontroldirective const originformcontrolngonchanges = formcontroldirective.prototype.ngonchanges; formcontroldirective.proto
Read more

unity3d - Rotate an object to face an opposite direction -

i have object , b. when click on object b, rotates object b (a faces b). b doesn't face a. need following : when faces b, need face opposite direction. have code rotating @ b. how rotate face opposite direction after that? vector3 targetdirection = target - transform.position; float step = speed * time.deltatime; vector3 newdirection = vector3.rotatetowards (turretdome.transform.forward, targetdirection, step, 0.0f); turretdome.transform.rotation = quaternion.lookrotation (newdirection); you object facing object b, want inverse direction of object after that? objecta.transform.rotation = quaternion.inverse(objecta.transform.rotation) but lets assume example turretdome object a, (negate direction): turretdome.transform.rotation = quaternion.lookrotation (-newdirection); naturally, both of these snippets not show how smoothen rotation, seem know how use time.deltatime. just incase unsure, quaternion.lerp this
Read more

javascript - Why jQuery Select box change event is now working? -

i working on product filters user select select box according his/her preference not getting selected value user in jquery. html code:- <select name="product_filter" id="product_filter"> <option value="price_low_first">price : low high</option> <option value="price_high_first">price : high low</option> <option value="latest">latest</option> <option value="popular">most popular</option> </select> jquery code: $(function () { $("#product_filter").change(function () { alert("hi") var selectedtext = $(this).find("option:selected").text(); var selectedvalue = $(this).val(); alert("selected text: " + selectedtext + " value: " + selectedvalue); }); }); hi believe code perfect. once please check jquery.min.js
Read more