Events

app:render

The event is triggered before each view of an app is rendered.

Parameters:

• view - the view for which the event is called

• url - an array of objects: the URL as an array of URL elements (each element object has such properties as page, params, and index)

• result - a wrapper object for UI; it's created in case you want to change the UI (e.g. to put it into some other view). result has only one property - ui.

You can use app:render to change the initial UI config and add properties to UI controls:

// myapp.js
...
app.attachEvent("app:render", function(view,url,result){
    if (result.ui.view === "button")
        result.ui.disabled = true;
});

app:route

Handling the app:route event resembles redefining the urlChange() of a class view. The event fires after navigation to a view.

Parameters:

• url - the URL as an array of URL elements (objects with three properties: page, params, and index).

app:route can be used to send notifications or messages to a log:

// myapp.js
...
app.attachEvent("app:route", function(url){
    webix.ajax("log.php", url);
});

app:route is used by the Menu plugin to highlight menu options according to the URL.

app:urlchange

The event fires when the app URL changes.

Parameters:

• view - the view for which the event is called

• url - the URL segment of the view

app:guard

The app:guard event is triggered before navigation to another view.

Parameters:

• url - a string with the attempted URL

• view - the parent view that contains a subview that will be blocked

• nav - an object that defines navigation to the next view

nav has three properties:

• redirect is the new URL; in the example above, it's used for redirection

• url is the URL split into an array of element objects (each has three properties: page, params, and index)

• confirm is a promise that is resolved when the app:guard event is called

One of the typical cases to use app:guard is to create a guard: block some views and redirect users somewhere else.

// myapp.js
...
app.attachEvent("app:guard", function(url, view, nav){
    if (url.indexOf("/blocked") !== -1){
        nav.redirect = "/top/allowed";
    }
});

View demo on GitHub >>

The app:guard event is used by the UnloadGuard plugin.

app:user:login

The app:user:login event is called by the User plugin when a user logs in.

Parameters:

• user - an object with user data.

// myapp.js
...
app.attachEvent("app:user:login",function(user){
    webix.ajax("log.php", user);
})

app:user:logout

The app:user:logout event is called by the User plugin when a user logs out.

// myapp.js
...
app.attachEvent("app:user:logout",function(){
    app.show("loginform");  //load "views/loginform.js"
});

app:error

This is a common event for all errors.

Parameters:

• err - the error object.

// myapp.js
...
app.attachEvent("app:error", function(err){
    alert("Error");
});

app:error:resolve

app:error:resolve fires when Jet can't find a module by its name.

Parameters:

• err - an error object

• url - the URL

If this error happens, it would be useful to redirect users somewhere else instead of showing them an empty screen:

// myapp.js
...
app.attachEvent("app:error:resolve", function(err, url) {
    webix.delay(() => app.show("/some"));
});

app:error:render

This event is triggered on errors during view rendering, mostly Webix UI related. It means that some view UI config has been written incorrectly.

Parameters:

• err - the error object.

// myapp.js
...
app.attachEvent("app:error:render", function(err){
    alert("Check UI config");
});

app:error:initview

This event is triggered in the case of an error during view rendering, mostly Webix Jet related. It means that Jet, while rendering Webix UIs, was unable to render the app UI correctly.

Parameters:

• err - the error object

• view - the view that caused the error

// myapp.js
...
app.attachEvent("app:error:initview", function(err,view){
    alert("Unable to render");
});

app:error:server

The event is called by the Status plugin when there is an error while setting a status.

Parameters:

• err - the error message or error object