You can do two things. Use
bind<https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Function/bind>
:
DescriptorValue.prototype.parse = function() {
var currentModuleName = GLOBALS.PARSERSDIR+this.parameters.name+'.js';
fs.exists(currentModuleName, function(exists) {
if (exists) {
var currentparser = require(currentModuleName);
currentparser.parse(this);
} else {
//getValue();
}
}.bind(this));
}
or declare a new variable and store the value of this:
DescriptorValue.prototype.parse = function() {
var currentModuleName = GLOBALS.PARSERSDIR+this.parameters.name+'.js';
var self = this;
fs.exists(currentModuleName, function(exists) {
if (exists) {
var currentparser = require(currentModuleName);
currentparser.parse(self);
} else {
//getValue();
}
});
};
either approach is okay for this case.
2013/3/28 Perrier <[email protected]>
> Hi,
>
> I have a class (DescriptorValue) and its following function:
>
> DescriptorValue.prototype.parse = function() {
> var currentModuleName = GLOBALS.PARSERSDIR+this.parameters.name+'.js';
> fs.exists(currentModuleName, function(exists) {
> if (exists) {
> var currentparser = require(currentModuleName);
> * currentparser.parse(this);*
> } else {
> //getValue();
> }
> });
> }
>
> I'd like to pass the DescriptorValue object itself to the parse method of
> the loaded module (currentparser) in the line with bold. I've seen several
> examples but can not solve this. Should I change this structure thus
> DescriptorValue's parse method shouldn't exist? This way the task of this
> method could be done from a function outside. But still, how can I pass a
> local variable into fs.exists' callback?
> Could you please help me?
>
> Thanks, Peter
>
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