We don't have any need to support any IE at this point.
On Thursday, June 11, 2020 at 2:08:48 PM UTC-4, stockiNail wrote:
>
> Hi all,
>
> I was facing an annoying issue about the hashcode *$N* property, stored
> inside the java script object.
>
> I'm using GWT 2.8.2 but no JSNI implementation, only JSInterop objects.
>
> I'm writing an object (JsType native) in order to configure a chart for
> Chart.js.
>
> @JsType(isNative = true, name = "Object", namespace = JsPackage.GLOBAL)
>
> Every property is the ID of another object.
>
> But unfortunately I got an error from Chart.js because it is scanning all
> properties keys to get the objects but it does not recognize the value of
> *$H*, being a number and not a object.
>
> scales: {
> $H: 135,
> x: {id: "x", _charbaId: 2, type: "category", axis: "x", display: true, …},
> y: {id: "y", _charbaId: 3, type: "linear", axis: "y", display: true, …}
> }
>
> It's clear that a hashcode must be stored therefore there is no way to remove
> it.
>
> Searching for a solution, I have found the *javaemul.internal.ObjectHashing*
> class which is managing the H$ property, I guess:
>
> public static native int getHashCode(Object o) /*-{
> return o.$H || (o.$H = @ObjectHashing::getNextHashId()());
> }-*/;
>
> I think the definition of H$ property must be changed, in order to define the
> property "not enumerable" (currently is writable, enumerable and
> configurable) using *Object.defineProperty()*, as it is reported
> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty.
>
> The *Object.defineProperty()* method is not supported into Internet Explorer
> 8 therefore if going to manage the hascode in this way, GWT will drop the
> support on IE8 as well.
>
> In the J2CL implementation, it looks like already aligned with my proposal:
>
>
> /**
> * Utility functions for setting and retrieving system level hashcodes.
> */
> class Hashing {
> /**
> * Gets a hash code on the passed-in object.
> *
> * @param {*} obj
> * @return {number}
> * @public
> */
> static $getHashCode(obj) {
> let o = /** @type {Object} */ (obj);
> return o.$systemHashCode || (Object.defineProperties(o, {
> $systemHashCode: {value: Hashing.$getNextHashId(), enumerable: false} }),
> o.$systemHashCode);
> }
>
> Anyway, as workaround, I'm rewriting the hashcode property for this object,
> maintaining the same value but setting the property as not enumerale and it
> seems working.
>
>
>
>
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