Setting a default action for an Ext.Ajax.request error situation

In my application, I frequently make ajax requests using the Ext.Ajax.request method. Often, I find myself skipping error handling for failed requests due to time constraints or lack of interest in implementing fancy error handling. As a result, my code usually looks like this:

    Ext.Ajax.request({
        url: 'requesturl',
        success: function (response) {
            //perform actions with response data
        },
        failure: function () {
            Ext.Msg.alert('Unknown Error', 'Please notify an administrator.');
        }

Is there a way to set a default failure function for all Ajax requests so that I don't have to specify it for each request individually?

javascriptajaxextjsextjs5

Answer №1

An alternative approach is to implement a global handler. However, as Drew pointed out, this could impact every single call made. It may be more straightforward to modify the existing code if you want this behavior to apply to all Ext.Ajax.request calls. 

Ext.Ajax.on('beforerequest', function( conn, options, eOpts ) {
    if (!options.failure) {
        options.failure = function() {...} 
    }
});

Answer №2

There are many paths to Rome, but in my opinion, the most elegant route is through utilizing "Ext.app.EventDomain".

// connect Ext.Ajax enent to Bus
Ext.define('MyApp.domain.Ajax', {
extend: 'Ext.app.EventDomain',
singleton: true,
type: 'extAjax',
idProperty: 'myRequest',
constructor: function() {
var me = this;
me.callParent();
me.monitor(Ext.Ajax);
}
});

Ext.define('Myapp.controller.Workspace', {
extend: 'Ext.app.Controller',

init: function() {
var me = this;
// use this controller to deal with event from Ext.ajax
me.listen({
extAjax: {
'*': {

requestexception: function(conn, response, options) {
console.log('exception', response.status, response);
if (response.status == 403) {
// open a window to ask login
popLoginWin();
}
}
}
}
});
}
});

This method is used for handling Session expiration, and it can also be applied to other scenarios effectively.

Answer №3

If you wish to maintain the integrity of the Ext object, consider creating a custom method on Ext.Ajax with a default failure handler as shown in the example below:

//Placeholder for the actual Ext object for the purposes of demonstration
var Ext = {
  Ajax: {
    request: function (r) {
      //Simulate a failure
      r.failure();
    }
  },
  Msg: {
    alert: function (title, message) {
      var el = document.createElement('div');
      
      el.innerHTML = title + ' - ' + message;
      document.body.appendChild(el);
    }
  }
}

//Add a custom method to Ext.Ajax
Ext.Ajax.requestWithDefaultFailure = function (r) {
  r.failure || (r.failure = function () {
    Ext.Msg.alert('Unknown Error', 'Please alert an administrator.');
  });
  
  Ext.Ajax.request(r);
};

//Now make your calls with the new method
Ext.Ajax.requestWithDefaultFailure({
  url: 'requesturl',
  success: function (response) {
    //request successful. do stuff with response
  }
});

Ext.Ajax.requestWithDefaultFailure({
  url: 'anotherUrl',
  success: function (response) {
    //request successful. do stuff with response
  },
  failure: function () {
    Ext.Msg.alert('Error', 'I specified a failure handler, so make sure to use that one instead of the default.')
  }
});

Alternatively, if you prefer not to modify Ext, you could create your own module for helper methods like this:

var ExtHelpers = {  
  ajaxRequestWithDefaultFailure: function (r) {
    r.failure || (r.failure = function () {
      Ext.Msg.alert('Unknown Error', 'Please alert an administrator.');
    });

    Ext.Ajax.request(r);
  };
};

Answer №4

To achieve this, you have the option to create an override or develop your own ajax class by extending from Ext.ajax in the context of MVC. This will allow you to incorporate effective error handling and logging.

For ExtJS 4:

Ext.define('Ext.overrides.Ajax', {
    override : 'Ext.data.Connection',
    listeners : {
        requestexception : function(response) {
            var error = response.status + ' - ' + response.statusText;
            
            if (response.status == 202) {
                Ext.Msg.show({
                    title : 'REST Warning message',
                    msg : 'Ajax Request Exception! ' + error,
                    cls : 'msg-wrap',
                    buttons : Ext.Msg.OK,
                    icon : Ext.Msg.WARNING
                });
            }

            if (response.status > 400) {
                var errorData = Ext.JSON.decode(response.responseText);

                Ext.Msg.show({
                    title : 'REST Error message',
                    msg : 'Ajax Request Exception! ' + errorData,
                    cls : 'msg-wrap',
                    buttons : Ext.Msg.OK,
                    icon : Ext.Msg.ERROR
                });
            }
        }
    }
});

For ExtJS 5:

Ext.define('Ext.override.AjaxOverride', {
    override: 'Ext.Ajax'
    // additional overridden properties...

}, function() {
    var me = this;

    me.setExtraParams({
        foo: "bar" 
    });

    me.setUrl('MyUrl');
    me.setTimeout(600000);

    me.on({
        scope: me,
        requestexception : function(response) {
            var error = response.status + ' - ' + response.statusText;
            
            if (response.status == 202) {
                Ext.Msg.show({
                    title : 'REST Warning message',
                    msg : 'Ajax Request Exception! ' + error,
                    cls : 'msg-wrap',
                    buttons : Ext.Msg.OK,
                    icon : Ext.Msg.WARNING
                });
            }

            if (response.status > 400) {
                var errorData = Ext.JSON.decode(response.responseText);

                Ext.Msg.show({
                    title : 'REST Error message',
                    msg : 'Ajax Request Exception! ' + errorData,
                    cls : 'msg-wrap',
                    buttons : Ext.Msg.OK,
                    icon : Ext.Msg.ERROR
                });
            }
        }
    });
});

Alternatively, it's recommended to extend from Ext.ajax like so:

Ext.define('APP.ux.Ajax', {
    extend: 'Ext.data.Connection',

    requires: [
        'APP.ux.Msg'
    ],

    singleton : true,
    autoAbort : false,

    request: function(config) {
        var cfg = config;

        Ext.apply(cfg, {
            success: function(form, action) {
                APP.ux.Msg.alert('Success', action.result.msg);
                //TODO: Add more logic here
            },
            failure: function(form, action) {
                switch (action.failureType) {
                    case Ext.form.action.Action.CLIENT_INVALID:
                        APP.ux.Msg.alert('Failure', 'Form fields may not be submitted with invalid values');
                        break;
                    case Ext.form.action.Action.CONNECT_FAILURE:
                        APP.ux.Msg.alert('Failure', 'Ajax communication failed');
                        break;
                    case Ext.form.action.Action.SERVER_INVALID:
                        APP.ux.Msg.alert('Failure', action.result.msg);
                        break;
                }
            }
        });
        this.callParent(cfg);
    }
});

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