This is one of the main reaons I prefer to write my code in Coffeescript. You don't have to do the this/that dance thing. You just use the => notation to define functions.
On Tuesday, August 13, 2013 1:34:57 AM UTC-7, bodo wrote: > > Thank you guy > > On Tuesday, August 13, 2013 2:46:55 AM UTC+2, Rick Waldron wrote: >> >> `this.collection` doesn't yet exist, so the `else` path in `saveData` is >> being taken, which is sent to `connectDB` which calls >> `MongoClient.connect`, but does not bind `this` to the callback. >> >> This change should work: >> >> this.connectDB(this.saveData.bind(this)); >> >> >> >> >> >> On Mon, Aug 12, 2013 at 7:22 PM, bodo <[email protected]> wrote: >> >>> I did a pretty code: >>> >>> var Square = function(id,order,color,state) { >>> >>> this.id = id; >>> this.order = order; >>> this.color = color; >>> this.state = state; >>> this.connected = false; >>> >>> MongoClient.connect(config.mongoURL, (function(err, db) { >>> this.connected = true; >>> this.db = db; //db >>> this.collection = db.collection("squares"); //collection >>> }).bind(this)); >>> } >>> >>> Square.prototype.connectDB = function(callback){ >>> >>> (function(that){ >>> MongoClient.connect(config.mongoURL, function(err, db) { >>> console.log("connected"); >>> this.connected = true; >>> this.db = db; //db >>> this.collection = db.collection("squares"); //collection >>> >>> //callback(that); >>> callback(); >>> >>> }); >>> >>> })(this); >>> } >>> >>> >>> Square.prototype.test = function(){ >>> console.log("test"); >>> } >>> >>> //export data >>> Square.prototype.exportData = function(){ >>> >>> var rtArr = { >>> id:this.id, >>> order:this.order, >>> color:this.color, >>> state:this.state >>> }; >>> >>> return rtArr; >>> } >>> >>> //save datas to mongo >>> Square.prototype.saveData = function () { >>> >>> if (this.collection){ >>> >>> *var doc = this.exportData();* >>> this.collection.insert(doc,function() { >>> console.log('inserted'); >>> }); >>> }else{ >>> this.connectDB(this.saveData); >>> } >>> } >>> >>> var square = new Square(6,1,'red',1); >>> square.saveData(); >>> >>> When I run this code, that display: >>> >>> throw err >>> ^ >>> TypeError: Object #<Object> has no method 'exportData' >>> >>> Why it can not understand *var doc = this.exportData(); ?* >>> * >>> * >>> Someone can help me ? Thank you very much >>> >>> -- >>> -- >>> Job Board: http://jobs.nodejs.org/ >>> Posting guidelines: >>> https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines >>> You received this message because you are subscribed to the Google >>> Groups "nodejs" group. >>> To post to this group, send email to [email protected] >>> To unsubscribe from this group, send email to >>> [email protected] >>> For more options, visit this group at >>> http://groups.google.com/group/nodejs?hl=en?hl=en >>> >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "nodejs" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >>> >> >> -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
