How to get storybook to pick up custom events - storybook

I have an input web component utilizing ShadowDOM, that internally has a simple structure:
<custom-input id="foobar">
::shadow
<div id="input-root" class="label-north">
<label for="input">Labeltext</label>
<input id="input" type="text" />
</div>
::endshadow
</custom-input>
Whenever the native change event occurs, I am replacing this native change event with a custom state-changed event that reports the component state in the event.detail payload. This event has composed: true and bubbles: true.
How do I get this custom event object to show up in the actions section in Storybook?
I have tried like this:
parameters: {
actions: {
handles: ['state-changed'],
},
},
But nothing shows up in actions when I change the value of the input.

I finally found the cause for the issue:
My web component would check if it has an id, as that is a core part of the event.detail payload. If none was present, I stopped emitting the state-change and instead issued a console.warn("Component cannot meaningfully report its state change as no id is present.", this).
As this warning didn't show up in the console (maybe because it's issued in an iframe?), I wasn't aware of the problem.
Once I gave all components an id it did work as described in the question.

Related

Google tag manager does not register click event

I'm trying to set up a click event for a certain button in GA4 Analytics in GTM, but the event does not fire in the preview.
The button has a specific ID. I can see the ID in the DOM, I can see that the gtm.element contains the ID in the API call, but the debug information shows that the Click ID does not match.
I've tested with my front-end developers that the event click events are propagated through the DOM. On a simple image where I've set up the click event in the same way the click event is properly registered.
Any insight in how to solve this is greatly appreciated.
From you screenshots. Looks like GTM detect the click is fired on the <span> inside the button you want.
For this kind of case. I would suggest to use click element as your trigger.
Here is the selector
button#ga_welcome_start_print_job, button#ga_welcome_start_print_job *
This means we want to track the click for the button and all the element inside it.
TLDR; wrap text in an attribute that has id property. Make a custom variable in GTM, of type 'Auto Event Variable' -> Variable Type = Element ID. Then assign to tag.
I had a similar situation. I was using React MUI's Button and I noticed that the id attribute wasn't actually being assigned to GA4's elementId. My guess is the id attribute wasn't 'bubbling' up or it was being processed somehow in MUI which conflicts with GA4. Anyways, I literally just started using analytics, so here's what I did to get it working.
I had a MUI button with the following setup
<Button
id='location-filter-tag'
className='reco-filter-button'
variant={searchState === 'cumulative' ? "contained" : "text"}
size="small"
onClick={() => {
setQueryType('cumulative');
}}
>
<h6 className="some-class">
Location
</h6>
</Button>
Checking the the push event gtm.click below, you can see the id='location-filter-tag' is concatenated into one big string. under gtm.element.
At the time, the gtm.elementId was an empty string (image is of working instance)
I tried to hook into gtm.element and trigger the tag using contains = location-filter-tag but that didn't work. So I moved the id property to the child attribute to get it to register with GA4's gtm.elementId
<h6
id='location-filter-tag'
className="text-overflow reco-filter-text"
>
Then in google tag manager, I setup a variable like so:
Then I assigned it as a trigger. This is my location trigger
hope that helps.

Todo App Example: Console doesn't show errors yet app doesn't work

Link to the git repo: https://github.com/todonoshow
I suspect the issue is related to the connection between the reducer and the container. In dir: src/containers/TodoList.js, I called:
mapStateToProps = state => ({ state: state.todos })
and
export default connect(mapStateToProps)(TodoList)
But I'm not sure if this is the right way to go about passing what the todos reducer returns to the container.
App's behavior: Layout shows up but nothing happens when I click 'Add Todo' after filling the input field.
Expected behavior: Input from the input field to show up as a list item part of an unordered list.
Your <button> must be wrapped within <form> as children, otherwise onSubmit will not even be called.
<form ...>
<button ... />
</form>
p.s. using ref and direct DOM manipulation is discouraged in React.

CommandButton action is not invoked [duplicate]

Sometimes, when using <h:commandLink>, <h:commandButton> or <f:ajax>, the action, actionListener or listener method associated with the tag are simply not being invoked. Or, the bean properties are not updated with submitted UIInput values.
What are the possible causes and solutions for this?
Introduction
Whenever an UICommand component (<h:commandXxx>, <p:commandXxx>, etc) fails to invoke the associated action method, or an UIInput component (<h:inputXxx>, <p:inputXxxx>, etc) fails to process the submitted values and/or update the model values, and you aren't seeing any googlable exceptions and/or warnings in the server log, also not when you configure an ajax exception handler as per Exception handling in JSF ajax requests, nor when you set below context parameter in web.xml,
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
and you are also not seeing any googlable errors and/or warnings in browser's JavaScript console (press F12 in Chrome/Firefox23+/IE9+ to open the web developer toolset and then open the Console tab), then work through below list of possible causes.
Possible causes
UICommand and UIInput components must be placed inside an UIForm component, e.g. <h:form> (and thus not plain HTML <form>), otherwise nothing can be sent to the server. UICommand components must also not have type="button" attribute, otherwise it will be a dead button which is only useful for JavaScript onclick. See also How to send form input values and invoke a method in JSF bean and <h:commandButton> does not initiate a postback.
You cannot nest multiple UIForm components in each other. This is illegal in HTML. The browser behavior is unspecified. Watch out with include files! You can use UIForm components in parallel, but they won't process each other during submit. You should also watch out with "God Form" antipattern; make sure that you don't unintentionally process/validate all other (invisible) inputs in the very same form (e.g. having a hidden dialog with required inputs in the very same form). See also How to use <h:form> in JSF page? Single form? Multiple forms? Nested forms?.
No UIInput value validation/conversion error should have occurred. You can use <h:messages> to show any messages which are not shown by any input-specific <h:message> components. Don't forget to include the id of <h:messages> in the <f:ajax render>, if any, so that it will be updated as well on ajax requests. See also h:messages does not display messages when p:commandButton is pressed.
If UICommand or UIInput components are placed inside an iterating component like <h:dataTable>, <ui:repeat>, etc, then you need to ensure that exactly the same value of the iterating component is been preserved during the apply request values phase of the form submit request. JSF will reiterate over it to find the clicked link/button and submitted input values. Putting the bean in the view scope and/or making sure that you load the data model in #PostConstruct of the bean (and thus not in a getter method!) should fix it. See also How and when should I load the model from database for h:dataTable.
If UICommand or UIInput components are included by a dynamic source such as <ui:include src="#{bean.include}">, then you need to ensure that exactly the same #{bean.include} value is preserved during the view build time of the form submit request. JSF will reexecute it during building the component tree. Putting the bean in the view scope and/or making sure that you load the data model in #PostConstruct of the bean (and thus not in a getter method!) should fix it. See also How to ajax-refresh dynamic include content by navigation menu? (JSF SPA).
The rendered attribute of the component and all of its parents and the test attribute of any parent <c:if>/<c:when> should not evaluate to false during the apply request values phase of the form submit request. JSF will recheck it as part of safeguard against tampered/hacked requests. Storing the variables responsible for the condition in a #ViewScoped bean or making sure that you're properly preinitializing the condition in #PostConstruct of a #RequestScoped bean should fix it. The same applies to the disabled and readonly attributes of the component, which should not evaluate to true during apply request values phase. See also JSF CommandButton action not invoked, Form submit in conditionally rendered component is not processed, h:commandButton is not working once I wrap it in a <h:panelGroup rendered> and Force JSF to process, validate and update readonly/disabled input components anyway
The onclick attribute of the UICommand component and the onsubmit attribute of the UIForm component should not return false or cause a JavaScript error. There should in case of <h:commandLink> or <f:ajax> also be no JS errors visible in the browser's JS console. Usually googling the exact error message will already give you the answer. See also Manually adding / loading jQuery with PrimeFaces results in Uncaught TypeErrors.
If you're using Ajax via JSF 2.x <f:ajax> or e.g. PrimeFaces <p:commandXxx>, make sure that you have a <h:head> in the master template instead of the <head>. Otherwise JSF won't be able to auto-include the necessary JavaScript files which contains the Ajax functions. This would result in a JavaScript error like "mojarra is not defined" or "PrimeFaces is not defined" in browser's JS console. See also h:commandLink actionlistener is not invoked when used with f:ajax and ui:repeat.
If you're using Ajax, and the submitted values end up being null, then make sure that the UIInput and UICommand components of interest are covered by the <f:ajax execute> or e.g. <p:commandXxx process>, otherwise they won't be executed/processed. See also Submitted form values not updated in model when adding <f:ajax> to <h:commandButton> and Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes.
If the submitted values still end up being null, and you're using CDI to manage beans, then make sure that you import the scope annotation from the correct package, else CDI will default to #Dependent which effectively recreates the bean on every single evaluation of the EL expression. See also #SessionScoped bean looses scope and gets recreated all the time, fields become null and What is the default Managed Bean Scope in a JSF 2 application?
If a parent of the <h:form> with the UICommand button is beforehand been rendered/updated by an ajax request coming from another form in the same page, then the first action will always fail in JSF 2.2 or older. The second and subsequent actions will work. This is caused by a bug in view state handling which is reported as JSF spec issue 790 and currently fixed in JSF 2.3. For older JSF versions, you need to explicitly specify the ID of the <h:form> in the render of the <f:ajax>. See also h:commandButton/h:commandLink does not work on first click, works only on second click.
If the <h:form> has enctype="multipart/form-data" set in order to support file uploading, then you need to make sure that you're using at least JSF 2.2, or that the servlet filter who is responsible for parsing multipart/form-data requests is properly configured, otherwise the FacesServlet will end up getting no request parameters at all and thus not be able to apply the request values. How to configure such a filter depends on the file upload component being used. For Tomahawk <t:inputFileUpload>, check this answer and for PrimeFaces <p:fileUpload>, check this answer. Or, if you're actually not uploading a file at all, then remove the attribute altogether.
Make sure that the ActionEvent argument of actionListener is an javax.faces.event.ActionEvent and thus not java.awt.event.ActionEvent, which is what most IDEs suggest as 1st autocomplete option. Having no argument is wrong as well if you use actionListener="#{bean.method}". If you don't want an argument in your method, use actionListener="#{bean.method()}". Or perhaps you actually want to use action instead of actionListener. See also Differences between action and actionListener.
Make sure that no PhaseListener or any EventListener in the request-response chain has changed the JSF lifecycle to skip the invoke action phase by for example calling FacesContext#renderResponse() or FacesContext#responseComplete().
Make sure that no Filter or Servlet in the same request-response chain has blocked the request fo the FacesServlet somehow. For example, login/security filters such as Spring Security. Particularly in ajax requests that would by default end up with no UI feedback at all. See also Spring Security 4 and PrimeFaces 5 AJAX request handling.
If you are using a PrimeFaces <p:dialog> or a <p:overlayPanel>, then make sure that they have their own <h:form>. Because, these components are by default by JavaScript relocated to end of HTML <body>. So, if they were originally sitting inside a <form>, then they would now not anymore sit in a <form>. See also p:commandbutton action doesn't work inside p:dialog
Bug in the framework. For example, RichFaces has a "conversion error" when using a rich:calendar UI element with a defaultLabel attribute (or, in some cases, a rich:placeholder sub-element). This bug prevents the bean method from being invoked when no value is set for the calendar date. Tracing framework bugs can be accomplished by starting with a simple working example and building the page back up until the bug is discovered.
Debugging hints
In case you still stucks, it's time to debug. In the client side, press F12 in webbrowser to open the web developer toolset. Click the Console tab so see the JavaScript conosle. It should be free of any JavaScript errors. Below screenshot is an example from Chrome which demonstrates the case of submitting an <f:ajax> enabled button while not having <h:head> declared (as described in point 7 above).
Click the Network tab to see the HTTP traffic monitor. Submit the form and investigate if the request headers and form data and the response body are as per expectations. Below screenshot is an example from Chrome which demonstrates a successful ajax submit of a simple form with a single <h:inputText> and a single <h:commandButton> with <f:ajax execute="#form" render="#form">.
(warning: when you post screenshots from HTTP request headers like above from a production environment, then make sure you scramble/obfuscate any session cookies in the screenshot to avoid session hijacking attacks!)
In the server side, make sure that server is started in debug mode. Put a debug breakpoint in a method of the JSF component of interest which you expect to be called during processing the form submit. E.g. in case of UICommand component, that would be UICommand#queueEvent() and in case of UIInput component, that would be UIInput#validate(). Just step through the code execution and inspect if the flow and variables are as per expectations. Below screenshot is an example from Eclipse's debugger.
If your h:commandLink is inside a h:dataTable there is another reason why the h:commandLink might not work:
The underlying data-source which is bound to the h:dataTable must also be available in the second JSF-Lifecycle that is triggered when the link is clicked.
So if the underlying data-source is request scoped, the h:commandLink does not work!
While my answer isn't 100% applicable, but most search engines find this as the first hit, I decided to post it nontheless:
If you're using PrimeFaces (or some similar API) p:commandButton or p:commandLink, chances are that you have forgotten to explicitly add process="#this" to your command components.
As the PrimeFaces User's Guide states in section 3.18, the defaults for process and update are both #form, which pretty much opposes the defaults you might expect from plain JSF f:ajax or RichFaces, which are execute="#this" and render="#none" respectively.
Just took me a looong time to find out. (... and I think it's rather unclever to use defaults that are different from JSF!)
I would mention one more thing that concerns Primefaces's p:commandButton!
When you use a p:commandButton for the action that needs to be done on the server, you can not use type="button" because that is for Push buttons which are used to execute custom javascript without causing an ajax/non-ajax request to the server.
For this purpose, you can dispense the type attribute (default value is "submit") or you can explicitly use type="submit".
Hope this will help someone!
Got stuck with this issue myself and found one more cause for this problem.
If you don't have setter methods in your backing bean for the properties used in your *.xhtml , then the action is simply not invoked.
I recently ran into a problem with a UICommand not invoking in a JSF 1.2 application using IBM Extended Faces Components.
I had a command button on a row of a datatable (the extended version, so <hx:datatable>) and the UICommand would not fire from certain rows from the table (the rows that would not fire were the rows greater than the default row display size).
I had a drop-down component for selecting number of rows to display. The value backing this field was in RequestScope. The data backing the table itself was in a sort of ViewScope (in reality, temporarily in SessionScope).
If the row display was increased via the control which value was also bound to the datatable's rows attribute, none of the rows displayed as a result of this change could fire the UICommand when clicked.
Placing this attribute in the same scope as the table data itself fixed the problem.
I think this is alluded to in BalusC #4 above, but not only did the table value need to be View or Session scoped but also the attribute controlling the number of rows to display on that table.
I had this problem as well and only really started to hone in on the root cause after opening up the browser's web console. Until that, I was unable to get any error messages (even with <p:messages>). The web console showed an HTTP 405 status code coming back from the <h:commandButton type="submit" action="#{myBean.submit}">.
In my case, I have a mix of vanilla HttpServlet's providing OAuth authentication via Auth0 and JSF facelets and beans carrying out my application views and business logic.
Once I refactored my web.xml, and removed a middle-man-servlet, it then "magically" worked.
Bottom line, the problem was that the middle-man-servlet was using RequestDispatcher.forward(...) to redirect from the HttpServlet environment to the JSF environment whereas the servlet being called prior to it was redirecting with HttpServletResponse.sendRedirect(...).
Basically, using sendRedirect() allowed the JSF "container" to take control whereas RequestDispatcher.forward() was obviously not.
What I don't know is why the facelet was able to access the bean properties but could not set them, and this clearly screams for doing away with the mix of servlets and JSF, but I hope this helps someone avoid many hours of head-to-table-banging.
I had lots of fun debugging an issue where a <h:commandLink>'s action in richfaces datatable refused to fire. The table used to work at some point but stopped for no apparent reason. I left no stone unturned, only to find out that my rich:datatable was using the wrong rowKeyConverter which returned nulls that richfaces happily used as row keys. This prevented my <h:commandLink> action from getting called.
One more possibility: if the symptom is that the first invocation works, but subsequent ones do not, you may be using PrimeFaces 3.x with JSF 2.2, as detailed here: No ViewState is sent.
I fixed my problem with placing the:
<h:commandButton class="btn btn-danger" value = "Remove" action="#{deleteEmployeeBean.delete}"></h:commandButton>
In:
<h:form>
<h:commandButton class="btn btn-danger" value = "Remove" action="#{deleteEmployeeBean.delete}"></h:commandButton>
</h:form>
This is the solution, which is worked for me.
<p:commandButton id="b1" value="Save" process="userGroupSetupForm"
actionListener="#{userGroupSetupController.saveData()}"
update="growl userGroupList userGroupSetupForm" />
Here, process="userGroupSetupForm" atrribute is mandatory for Ajax call. actionListener is calling a method from #ViewScope Bean. Also updating growl message, Datatable: userGroupList and Form: userGroupSetupForm.
<ui:composition>
<h:form id="form1">
<p:dialog id="dialog1">
<p:commandButton value="Save" action="#{bean.method1}" /> <!--Working-->
</p:dialog>
</h:form>
<h:form id="form2">
<p:dialog id="dialog2">
<p:commandButton value="Save" action="#{bean.method2}" /> <!--Not Working-->
</p:dialog>
</h:form>
</ui:composition>
To solve;
<ui:composition>
<h:form id="form1">
<p:dialog id="dialog1">
<p:commandButton value="Save" action="#{bean.method1}" /> <!-- Working -->
</p:dialog>
<p:dialog id="dialog2">
<p:commandButton value="Save" action="#{bean.method2}" /> <!--Working -->
</p:dialog>
</h:form>
<h:form id="form2">
<!-- .......... -->
</h:form>
</ui:composition>

Responding Globally to a 401 in Polymer

Using Polymer 1.0, I am looking for the best approach to showing a login to a user when the app receives a 401 from the app services.
Using Angular I would be looking at using a httpInterceptor to do this, is there an equivalent in Polymer?
Here's an approach which explicitly routes errors from a service element (using iron-ajax)
<template is="dom-bind" id="app">
<values-service values="{{items}}" on-error="onError"></values-service>
<h1>Items <span>{{items}}</span></h1>
<template is="dom-repeat" items="{{items}}">
<p>{{item}}</p>
</template>
</template>
<script src="app.js"></script>
and my app script
(function (document) {
'use strict';
var app = document.querySelector('#app');
app.onError = function (e) {
console.log('app.onError ' + e.detail.request.status);
};
app.addEventListener('error', app.onError);
})(document);
this works, but as the login is something I want to happen without having to wire up elements specifically
To solve this, I created a component that was used for all my Ajax requests. In that component, listened for 401s from the service calls, and called this.fire('401-found') when found.
Then in my other components, I listened for such an event - in my case, in the main document, popping up a dialog asking the user to log in again.
A slightly better approach would be to have the Ajax component take in parameters to say 'yes fire a 401 event' and 'do not give it the standard 401 event, name call it this' then in each component you could listen for such events and react accordingly.
The answer is catching the error on an outermost element as the events bubble up through the dom
<div on-error="onError">
<values-service values="{{items}}"></values-service>
<other-service></other-service>
...
</div>
and some script (as above)
app.onError = function (e) {
console.log('app.onError ' + e.detail.request.status);
};
when any of the contained services, or any contained elements containing services fire an error, the handler will trigger - I do the relevant checks for a request and a 401 and show my login dialog
I recently made a PR to iron-ajax (which was merged a few days ago) that adds an optional bubbles attribute to accomplish exactly this. When the bubbles attribute is present, iron-ajax's request, response, and error events bubble to window. This means you can have global event listeners on window and handle 401s however you want without any more code duplication that adding bubbles to your iron-ajax calls.
What's more, because it's part of iron-ajax, it is officially supported by the Polymer team.
Here's the official docs.

How can I react to DOM events that Meteor Templates don't support?

Currently meteor supports a limited number of events that we can react to from our template definitions. I would like a way to react to events beyond this predefined list. I want the freedom to add any event, even custom events, to the list of possible events in a template.
One idea I had would be to set up a jquery event handler somewhere that listens for the unsupported event and have it set a session variable:
$(form).submit( ->
Session.set('formSubmitted', true)
And then use that session variable when rendering a template:
Template.confirmation.submitted = ->
return Session.get('formSubmitted')
<template name="confirmation">
{{#if submitted}}
<!-- do whatever -->
{{/if}}
</template>
But this is just a workaround and doesn't really address the issue. Is there a real Meteor-way of doing this? Is this something I can do with the new Spark implementations?
NOTE: Please ignore the fact that I'm using the submit event here. I know I can just bind a click event to the submit button, but that's beside the point.
NOTE 2: The accepted answer to this question is also just a workaround.
The rendered callback is what I use to do this.
http://docs.meteor.com/#template_rendered
The callback gives you template instance you should use to find the dom elements you need: http://docs.meteor.com/#template_inst
Untested example below ;)
Template.foo.rendered = ->
$(this.find("form")).submit ->
Session.set 'formSubmitted', true
Using a Session variable than to switch the view is a matter of taste I think.
I have an app State stored in the Session, that toggles Templates. Additionally the backbone package is very useful to provide some meaningful urls.

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