Related: https://groups.google.com/forum/#!topic/google-web-toolkit/k_o1fYjETY4 
(tl;dr: it *is* possible, it just needs a bit more work on your part; JSNI 
or JsInterop/elemental2 are also an option)

On Tuesday, June 6, 2017 at 4:49:28 PM UTC+2, Maciek Smolczewski wrote:
>
> I'm trying to impement range input widget (slider) used in conjunction 
> with textbox. I want the textbox to display value chosen by the slider 
> while the mouse is dragging. This would be very easy if I could register on 
> ONINPUT events. Unfortunately it's not an option currently..
>
> W dniu poniedziałek, 27 grudnia 2010 20:08:14 UTC+1 użytkownik Robert 
> Staats napisał:
>>
>> Reviewers: ,
>>
>> Description:
>> I used Issue 51810 as my template for this
>> (http://gwt-code-reviews.appspot.com/51810).
>>
>> I use sinkEvents to catch onPaste events to a TextBox so I can react to
>> changes on TextBoxes without waiting for it to loose focus. This works 
>> well
>> for IE and Firefox but Opera does not support onPaste.
>>
>> Opera has an onInput event that provides a way to detect a TextBox change.
>> This patch allows the onInput event to be detected in GWT.
>>
>> Please review this at http://gwt-code-reviews.appspot.com/1248801/show
>>
>> Affected files:
>>    user/src/com/google/gwt/user/client/Event.java
>>    user/src/com/google/gwt/user/client/impl/DOMImpl.java
>>    user/src/com/google/gwt/user/client/impl/DOMImplOpera.java
>>    user/src/com/google/gwt/user/client/impl/DOMImplStandard.java
>>    user/src/com/google/gwt/user/client/impl/DOMImplTrident.java
>>
>>
>> Index: user/src/com/google/gwt/user/client/impl/DOMImpl.java
>> ===================================================================
>> --- user/src/com/google/gwt/user/client/impl/DOMImpl.java        (revision
>> 9483)
>> +++ user/src/com/google/gwt/user/client/impl/DOMImpl.java        (working
>> copy)
>> @@ -92,6 +92,7 @@
>>       case "gesturestart": return 0x1000000;
>>       case "gesturechange": return 0x2000000;
>>       case "gestureend": return 0x4000000;
>> +        case "input": return 0x8000000;
>>       default: return -1;
>>       }
>>     }-*/;
>> Index: user/src/com/google/gwt/user/client/impl/DOMImplStandard.java
>> ===================================================================
>> --- user/src/com/google/gwt/user/client/impl/DOMImplStandard.java
>> (revision  
>> 9483)
>> +++ user/src/com/google/gwt/user/client/impl/DOMImplStandard.java
>> (working  
>> copy)
>> @@ -271,6 +271,8 @@
>>           @com.google.gwt.user.client.impl.DOMImplStandard::dispatchEvent 
>> :
>>
>> null;
>>       if (chMask & 0x4000000) elem.ongestureend    = (bits & 0x4000000) ?
>>           @com.google.gwt.user.client.impl.DOMImplStandard::dispatchEvent 
>> :
>>
>> null;
>> +        if (chMask & 0x8000000) elem.oninput       = (bits & 0x8000000) ?
>> +        @com.google.gwt.user.client.impl.DOMImplStandard::dispatchEvent 
>> :  
>> null;
>>     }-*/;
>>
>>     private native void releaseCaptureImpl(Element elem) /*-{
>> Index: user/src/com/google/gwt/user/client/impl/DOMImplOpera.java
>> ===================================================================
>> --- 
>> user/src/com/google/gwt/user/client/impl/DOMImplOpera.java        (revision 
>>  
>> 9483)
>> +++ 
>> user/src/com/google/gwt/user/client/impl/DOMImplOpera.java        (working  
>> copy)
>> @@ -68,5 +68,7 @@
>>           @com.google.gwt.user.client.impl.DOMImplStandard::dispatchEvent 
>> :
>>
>> null;
>>       elem.onpaste       = (bits & 0x80000) ?
>>           @com.google.gwt.user.client.impl.DOMImplStandard::dispatchEvent 
>> :
>>
>> null;
>> +        elem.oninput       = (bits & 0x8000000) ?
>> +        @com.google.gwt.user.client.impl.DOMImplStandard::dispatchEvent 
>> :  
>> null;
>>     }-*/;
>>   }
>> Index: user/src/com/google/gwt/user/client/impl/DOMImplTrident.java
>> ===================================================================
>> --- user/src/com/google/gwt/user/client/impl/DOMImplTrident.java
>> (revision  
>> 9483)
>> +++ user/src/com/google/gwt/user/client/impl/DOMImplTrident.java
>> (working  
>> copy)
>> @@ -278,5 +278,7 @@
>>            
>> @com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
>>       if (chMask & 0x80000) elem.onpaste       = (bits & 0x80000) ?
>>            
>> @com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
>> +        if (chMask & 0x8000000) elem.oninput       = (bits & 0x8000000) ?
>> +         
>> @com.google.gwt.user.client.impl.DOMImplTrident::callDispatchEvent : null;
>>     }-*/;
>>   }
>> Index: user/src/com/google/gwt/user/client/Event.java
>> ===================================================================
>> --- user/src/com/google/gwt/user/client/Event.java        (revision 9483)
>> +++ user/src/com/google/gwt/user/client/Event.java        (working copy)
>> @@ -272,6 +272,15 @@
>>      */
>>     public static final int ONGESTURESTART = 0x1000000;
>>
>> +   /**
>> +   * Fired when the contents of a textarea, input:text, input:password or
>> +   * input:search element have changed, because the onchange event on 
>> these
>> +   * elements fires when the element loses focus, not immediately after
>> the modification.
>> +   *
>> +   * Note: This event is <em>not</em> supported on Internet Explorer.
>> +   */
>> +  public static final int ONINPUT = 0x8000000;
>> +
>>     /**
>>      * Fired when the user depresses a key.
>>      */
>>
>>

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