Google Web Toolkit: August 2018

Friday, August 31, 2018

Re: How to write RPC services that don't inherit RemoteService?

I figured there wasn't something ready for this out of the box but if the effort isn't so big I'd considered implementing.

I think there should be a way to avoid extending RemoteInterface, which pollutes pure Java code. I think where would be benefits with or without Spring. GWT.create() is on the client side, right? Why does the original interface matter if it uses the async version?

There's a verification in the method RPC.decodeRequest (GWT 2.7) which I think serves only to avoid a client making a request to a random not RPC-exposed service at the server. It checks if the class "isAssignableFrom" RemoteService.class. I believe this verification could be changed to a method like "is registered as an RPC service" and given some flexibility over what to expose (not only classes implementing RemoteService interface).

I'll probably write my own code for this but I feel this is something desirable to the community because it keeps the original interface untouched.

Douglas

Em sex, 31 de ago de 2018 às 12:07, Thomas Broyer <t.broyer@gmail.com> escreveu:

Your interfaces need to extend RemoteService, otherwise the GWT.create() will fail; so I don't think what you're trying to do would be possible…

It might be possible to create those proxies programmatically though using java.lang.reflect.Proxy, binding everything together through reflection and Spring BeanFactory/ApplicationContext, and even generating the GWT interfaces automatically from the non-GWT ones (public interface ExampleService implements ExampleServiceStub, RemoteService {})
You'd have to somehow dig into RPC "internals" though, to replace the RemoteServiceServlet behavior to load your beans (there used to be a project named spring4gwt that did this years ago)

(disclaimer: I'm not a Spring user –I don't like Spring–, so I can't help further)

On Friday, August 31, 2018 at 3:13:56 PM UTC+2, Douglas de Oliveira Mendes wrote:
Hi,

I have a bunch of service interfaces in a jar. They don't extend RemoteService interface. Their server side implementations are currently spring remoting stubs (HttpInvokerProxyFactoryBean).

[browser side] <---RPC---> [server side] <---Spring remoting (http invoker)---> [actual service implementations with business rules and all]

I wish to use these interfaces (or their async versions) client side on GWT enabling compile time verifications. Currently I have dumb server side implementations that delegate all the calls. Like this:

public class ExampleServiceImpl implements ExampleService { @Resource private ExampleServiceStub exampleServiceStub; int doSomething() { return exampleServiceStub.doSomething(); }

I would like to get rid of the above class. Ideas? Something better than overriding RPC.decodeRequest method? Maybe it's something that has already been done...

Thanks!
Douglas

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Re: Call async js method from GWT via j2cl?

GWT won't generate async functions, so there's no way to async/await in GWT with JsInterop (currently, might come in the future… possibly only in J2Cl:GWT3 though…)

You'll have to use promises (I'd suggest elemental2.promise.Promise, with Java 8 lambdas for readability)

On Friday, August 31, 2018 at 8:33:46 AM UTC+2, Anders Forsell wrote:

Hello,

Can I call an async JS method from GWT using J2CL?

The JS code is nicer to write using async/await than with callbacks, but not sure how to handle that from GWT side...

Thanks,

Re: How to write RPC services that don't inherit RemoteService?

Your interfaces need to extend RemoteService, otherwise the GWT.create() will fail; so I don't think what you're trying to do would be possible…

It might be possible to create those proxies programmatically though using java.lang.reflect.Proxy, binding everything together through reflection and Spring BeanFactory/ApplicationContext, and even generating the GWT interfaces automatically from the non-GWT ones (public interface ExampleService implements ExampleServiceStub, RemoteService {})

You'd have to somehow dig into RPC "internals" though, to replace the RemoteServiceServlet behavior to load your beans (there used to be a project named spring4gwt that did this years ago)

(disclaimer: I'm not a Spring user –I don't like Spring–, so I can't help further)

On Friday, August 31, 2018 at 3:13:56 PM UTC+2, Douglas de Oliveira Mendes wrote:

Hi,

I have a bunch of service interfaces in a jar. They don't extend RemoteService interface. Their server side implementations are currently spring remoting stubs (HttpInvokerProxyFactoryBean).

[browser side] <---RPC---> [server side] <---Spring remoting (http invoker)---> [actual service implementations with business rules and all]

I wish to use these interfaces (or their async versions) client side on GWT enabling compile time verifications. Currently I have dumb server side implementations that delegate all the calls. Like this:

public class ExampleServiceImpl implements ExampleService { @Resource private ExampleServiceStub exampleServiceStub; int doSomething() { return exampleServiceStub.doSomething(); }

I would like to get rid of the above class. Ideas? Something better than overriding RPC.decodeRequest method? Maybe it's something that has already been done...

Thanks!
Douglas

How to write RPC services that don't inherit RemoteService?

Hi,

I have a bunch of service interfaces in a jar. They don't extend RemoteService interface. Their server side implementations are currently spring remoting stubs (HttpInvokerProxyFactoryBean).

[browser side] <---RPC---> [server side] <---Spring remoting (http invoker)---> [actual service implementations with business rules and all]

I wish to use these interfaces (or their async versions) client side on GWT enabling compile time verifications. Currently I have dumb server side implementations that delegate all the calls. Like this:

public class ExampleServiceImpl implements ExampleService {
@Resource
private ExampleServiceStub exampleServiceStub;
int doSomething() {
  return exampleServiceStub.doSomething();
}

I would like to get rid of the above class. Ideas? Something better than overriding RPC.decodeRequest method? Maybe it's something that has already been done...

Thanks!
Douglas

Thursday, August 30, 2018

Re: Call async js method from GWT via j2cl?

Sry, i meant Jsinterop not J2CL...

On Friday, August 31, 2018 at 8:33:46 AM UTC+2, Anders Forsell wrote:

Hello,

Can I call an async JS method from GWT using J2CL?

The JS code is nicer to write using async/await than with callbacks, but not sure how to handle that from GWT side...

Thanks,

Call async js method from GWT via j2cl?

Hello,

Can I call an async JS method from GWT using J2CL?

The JS code is nicer to write using async/await than with callbacks, but not sure how to handle that from GWT side...

Thanks,

Why the GWT complier used so much memory?

When i was compiling the GWT application,the CPU usage is showing below

How can i reduce the memory footprint of my application

Re: how to create an anchor column in a celltable

Problem solved, thank you everyone,

a special thank to hy

On Tuesday, August 28, 2018 at 6:00:00 PM UTC+2, Ousti Driss wrote:

Hey everyone,

I'm writing the code of a simple web app using gwt, I have a Celltable all its columns are String type,
one of the columns is a url column , I want to make this column clickable, which means once you click on a cell
of this column, you are redicted to the url shown, is that possible?
i tried to add an anchor column to the table, but I got error messages while defining this column when I call the getValue method, the type of return should be a string!!
Is there a way to do such a thing?

Thank you :)

Re: how to create an anchor column in a celltable

Problem solved, thank you everyone,

a special thank to hy

On Wednesday, August 29, 2018 at 6:52:36 PM UTC+2, hy wrote:

Create a class that renders anchor like below:
public class CustomAnchorCell extends ClickableTextCell { private String itsHref = ""; private boolean isEnabled = true; public CustomAnchorCell(String inHref) { super(); itsHref = inHref; } public CustomAnchorCell() { super(); itsHref = ""; } public CustomAnchorCell(String inHref, boolean inEnabled) { this(inHref); isEnabled = inEnabled; } @Override protected void render(Context context, SafeHtml value, SafeHtmlBuilder sb) { if (value != null) { String theElementStart = ""; String theElementEnd = ""; if (isEnabled) { theElementStart = "<a href='" + itsHref + "'"; theElementEnd = "</a>"; } else { theElementStart = "<span"; theElementEnd = "</span>"; } sb.appendHtmlConstant(theElementStart + " class='" + itsClassName + "'>") .append(value) .appendHtmlConstant(theElementEnd); } } public void setHref(String inHref) { itsHref = inHref; } public void setEnabled(boolean inEnabled) { isEnabled = inEnabled; } public void setClassName(String inClassName) { itsClassName = inClassName; } }
Use it like this:
Column<Report, String> theReport = new Column< Report, String>(new CustomAnchorCell()) { @Override public String getValue(Report object) { return "Hello New Tab"; } @Override public void render(Cell.Context context, Report object, SafeHtmlBuilder sb) { CustomAnchorCell theCustomAnchorCell = (CustomAnchorCell) getCell(); theCustomAnchorCell.setHref("_your new tab url_"); theCustomAnchorCell.setClassName("_your custom css class name_"); super.render(context, object, sb); } };
On Wednesday, August 29, 2018 at 10:50:25 AM UTC-4, Ousti Driss wrote:
What I want is when you click on the cell a new tab opens with the url you clicked,
my string url column is filled with the response I get from the servlet
can you please give me more details on the alternative response.

On Wednesday, August 29, 2018 at 3:45:27 PM UTC+2, Thomas Broyer wrote:
If you want to display text as-is (e.g. not a link), then you can use a ClickableTextCell (see it live, with source code, in http://samples.gwtproject.org/samples/Showcase/Showcase.html#!CwCellSampler), the FieldUpdater will be called when the cell is clicked.
Alternatively, you could use a TextCell with a custom SafeHtmlRenderer that would wrap the URL in a link (easiest would probably be to implement this using a SafeHtmlTemplates: pass the URL as input –you'll want to pass it as a SafeUri, constructed using UriUtils.fromString()–, use it to construct something like <a href="{0}" target="_blank">{0}</a>)

On Tuesday, August 28, 2018 at 6:00:00 PM UTC+2, Ousti Driss wrote:
Hey everyone,

I'm writing the code of a simple web app using gwt, I have a Celltable all its columns are String type,
one of the columns is a url column , I want to make this column clickable, which means once you click on a cell
of this column, you are redicted to the url shown, is that possible?
i tried to add an anchor column to the table, but I got error messages while defining this column when I call the getValue method, the type of return should be a string!!
Is there a way to do such a thing?

Thank you :)

Wednesday, August 29, 2018

Re: how to create an anchor column in a celltable

Create a class that renders anchor like below:

public class CustomAnchorCell
        extends ClickableTextCell {

    private String itsHref = "";
    private boolean isEnabled = true;

    public CustomAnchorCell(String inHref) {
        super();
        itsHref = inHref;
    }

    public CustomAnchorCell() {
        super();
        itsHref = "";
    }

    public CustomAnchorCell(String inHref, boolean inEnabled) {
        this(inHref);
        isEnabled = inEnabled;
    }

    @Override
    protected void render(Context context, SafeHtml value, SafeHtmlBuilder sb) {
        if (value != null) {
            String theElementStart = "";
            String theElementEnd = "";
            if (isEnabled) {
                theElementStart = "<a href='" + itsHref + "'";
                theElementEnd = "</a>";
            } else {
                theElementStart = "<span";
                theElementEnd = "</span>";
            }
            sb.appendHtmlConstant(theElementStart + " class='" + itsClassName + "'>")
                    .append(value)
                    .appendHtmlConstant(theElementEnd);
        }
    }

    public void setHref(String inHref) {
        itsHref = inHref;
    }

    public void setEnabled(boolean inEnabled) {
        isEnabled = inEnabled;
    }

    public void setClassName(String inClassName) {
        itsClassName = inClassName;
    }
}

Use it like this:

Column<Report, String> theReport = new Column< Report, String>(new CustomAnchorCell()) {
    @Override
    public String getValue(Report object) {
        return "Hello New Tab";
    }

    @Override
    public void render(Cell.Context context, Report object, SafeHtmlBuilder sb) {
        CustomAnchorCell theCustomAnchorCell = (CustomAnchorCell) getCell();
        theCustomAnchorCell.setHref("_your new tab url_");
        theCustomAnchorCell.setClassName("_your custom css class name_");

        super.render(context, object, sb);
    }
};

On Wednesday, August 29, 2018 at 10:50:25 AM UTC-4, Ousti Driss wrote:

What I want is when you click on the cell a new tab opens with the url you clicked,
my string url column is filled with the response I get from the servlet
can you please give me more details on the alternative response.

On Wednesday, August 29, 2018 at 3:45:27 PM UTC+2, Thomas Broyer wrote:
If you want to display text as-is (e.g. not a link), then you can use a ClickableTextCell (see it live, with source code, in http://samples.gwtproject.org/samples/Showcase/Showcase.html#!CwCellSampler), the FieldUpdater will be called when the cell is clicked.
Alternatively, you could use a TextCell with a custom SafeHtmlRenderer that would wrap the URL in a link (easiest would probably be to implement this using a SafeHtmlTemplates: pass the URL as input –you'll want to pass it as a SafeUri, constructed using UriUtils.fromString()–, use it to construct something like <a href="{0}" target="_blank">{0}</a>)

On Tuesday, August 28, 2018 at 6:00:00 PM UTC+2, Ousti Driss wrote:
Hey everyone,

I'm writing the code of a simple web app using gwt, I have a Celltable all its columns are String type,
one of the columns is a url column , I want to make this column clickable, which means once you click on a cell
of this column, you are redicted to the url shown, is that possible?
i tried to add an anchor column to the table, but I got error messages while defining this column when I call the getValue method, the type of return should be a string!!
Is there a way to do such a thing?

Thank you :)

Re: how to create an anchor column in a celltable

What I want is when you click on the cell a new tab opens with the url you clicked,

my string url column is filled with the response I get from the servlet

can you please give me more details on the alternative response.

On Wednesday, August 29, 2018 at 3:45:27 PM UTC+2, Thomas Broyer wrote:

If you want to display text as-is (e.g. not a link), then you can use a ClickableTextCell (see it live, with source code, in http://samples.gwtproject.org/samples/Showcase/Showcase.html#!CwCellSampler), the FieldUpdater will be called when the cell is clicked.
Alternatively, you could use a TextCell with a custom SafeHtmlRenderer that would wrap the URL in a link (easiest would probably be to implement this using a SafeHtmlTemplates: pass the URL as input –you'll want to pass it as a SafeUri, constructed using UriUtils.fromString()–, use it to construct something like <a href="{0}" target="_blank">{0}</a>)

On Tuesday, August 28, 2018 at 6:00:00 PM UTC+2, Ousti Driss wrote:
Hey everyone,

I'm writing the code of a simple web app using gwt, I have a Celltable all its columns are String type,
one of the columns is a url column , I want to make this column clickable, which means once you click on a cell
of this column, you are redicted to the url shown, is that possible?
i tried to add an anchor column to the table, but I got error messages while defining this column when I call the getValue method, the type of return should be a string!!
Is there a way to do such a thing?

Thank you :)

Re: how to create an anchor column in a celltable

If you want to display text as-is (e.g. not a link), then you can use a ClickableTextCell (see it live, with source code, in http://samples.gwtproject.org/samples/Showcase/Showcase.html#!CwCellSampler), the FieldUpdater will be called when the cell is clicked.

Alternatively, you could use a TextCell with a custom SafeHtmlRenderer that would wrap the URL in a link (easiest would probably be to implement this using a SafeHtmlTemplates: pass the URL as input –you'll want to pass it as a SafeUri, constructed using UriUtils.fromString()–, use it to construct something like <a href="{0}" target="_blank">{0}</a>)

On Tuesday, August 28, 2018 at 6:00:00 PM UTC+2, Ousti Driss wrote:

Hey everyone,

I'm writing the code of a simple web app using gwt, I have a Celltable all its columns are String type,
one of the columns is a url column , I want to make this column clickable, which means once you click on a cell
of this column, you are redicted to the url shown, is that possible?
i tried to add an anchor column to the table, but I got error messages while defining this column when I call the getValue method, the type of return should be a string!!
Is there a way to do such a thing?

Thank you :)

Re: how to create an anchor column in a celltable

Hi,

You can use a custom cell to do what you want.

You can look at the ButtonCell class for exemple

The render() method is called for each row of the cell table, you can make your <a href=""> link there

@see com.google.gwt.cell.client.ButtonCell

Le mar. 28 août 2018 à 18:00, Ousti Driss <ousti.driss@gmail.com> a écrit :

Hey everyone,

I'm writing the code of a simple web app using gwt, I have a Celltable all its columns are String type,
one of the columns is a url column , I want to make this column clickable, which means once you click on a cell
of this column, you are redicted to the url shown, is that possible?
i tried to add an anchor column to the table, but I got error messages while defining this column when I call the getValue method, the type of return should be a string!!
Is there a way to do such a thing?

Thank you :)

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Tuesday, August 28, 2018

GWT app and Chrome Lighthouse

I've got a GWT 2.7 app. The index.html is fairly standard:

<script type="text/javascript" language="javascript" src="xxx/xxx.nocache.js"></script>

<body>
    <!-- RECOMMENDED if your web app will not function without JavaScript enabled -->
    <noscript>
        <div
            style="width: 22em; position: absolute; left: 50%; margin-left: -11em; color: red; background-color: white; border: 1px solid red; padding: 4px; font-family: sans-serif">
            Your web browser must have JavaScript enabled in order for this
            application to display correctly.</div>
    </noscript>
</body>

Lighthouse doesn't give a SEO result and displays the error message about JS not enabled.

When I run Lighthouse on an Angular app it has no problem.

Anyone know why ?

Re: hwo to get the server working?

Oh please don't confuse things further! "embedded" as is "running within the same process as DevMode", not a "small hardware device"

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how to create an anchor column in a celltable

Hey everyone,

I'm writing the code of a simple web app using gwt, I have a Celltable all its columns are String type,

one of the columns is a url column , I want to make this column clickable, which means once you click on a cell

of this column, you are redicted to the url shown, is that possible?

i tried to add an anchor column to the table, but I got error messages while defining this column when I call the getValue method, the type of return should be a string!!

Is there a way to do such a thing?

Thank you :)

Re: hwo to get the server working?

Correct, the code server is the only component I'm using.

On Monday, August 27, 2018 at 7:53:36 PM UTC-3, Thomas Broyer wrote:

Sorry if I wasn't clear: DevMode with -noserver is basically the same as CodeServer. The embedded server is discouraged, not CodeServer (or DevMode with -noserver).

Monday, August 27, 2018

Re: hwo to get the server working?

If possible, you should use Super dev mode.

If you install tomcat on the embedded server, you can use it without problems.

I am using Raspberry pi

2018年8月28日(火) 7:53 Thomas Broyer <t.broyer@gmail.com>:

Sorry if I wasn't clear: DevMode with -noserver is basically the same as CodeServer. The embedded server is discouraged, not CodeServer (or DevMode with -noserver).

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