I want to do something like this:
var build= (function(){
//my function body
})();
function test(){
//somthing then call build
build() //i want to call build function again in my code
}
How can I do this?
I tried this in angular:
var buildRoot = (() => {
$SubNode.get({
TypeID: vendorAdminService.NodeType.Category
}, function(data: vendorAdminService.IGetNodeParameters) {
$scope.ProductTree = data.TreeNodeModelItem;
$scope.AjaxLoading = false;
}, function(err) {
// alert(err)
})
})();
$mdDialog.show(confirm).then(function() {
$Category.Remove(node.ID)
buildRoot
}, function() {
});
but it does not work.
Anybody can guide me??
You need to return a function in your IIFE.
If you IIF is not trivial and has many functionalities you could also consider using Reveal Module Pattern.
var build = (function() {
var f = function() {
console.log('hello');
};
f();
return f;
})();
function test() {
build();
}
test();
Just use a named function.
Your IIFE needs to return a function, for later calling. But then is no need for an anonymous function.
function build() {
//my function body
}
or
var build = function () {
//my function body
};
var build = (function() {
var init = function() {
// magic code
};
return {
init: init
}
}());
function test() {
build.init()
}
test();
You include all your functionalities inside your build object, and you'll be able to call them as soon as you return them from inside that object. This effectively is called the revealing module pattern
For more information, read this
I see that there are missing semi-colons ";"
$mdDialog.show(confirm).then(function() {
$Category.Remove(node.ID);
buildRoot();
}, function() {
});
Related
This is the question:
Define a function named print which just print out the parameters it gets.
But it will not print out anything if it's called normally.
Only in a setTimeout callback will become effective.
e.g:
setTimeout(function() {
print('123'); //===> 123
});
print('456'); //===> nothing output
I have one solution but I don't think it's a good way, I rewrite the setTimeout.
I want a better solution curiously.
var print = function() {
'use strict';
var __origSetTimeout = window.setTimeout;
window.setTimeout = function(fn, delay) {
var _fn = new Function(`(${fn.toString().replace(/print\(/g, 'print.call(this,')}).call(this);`);
return __origSetTimeout.call(window, _fn.bind({
isFromSetTimeout: true
}), delay);
};
return function print(word) {
if (!this || !!this && !this.isFromSetTimeout) return;
console.log(word);
};
}.call(null);
You can use scope to solve this, for example
function A(){
let print = function(str){
console.log(str);
}
this.setTimeout = function(){
setTimeout(function(){
print('123');
}, 1000);
}
}
let a = new A();
a.setTimeout();
You could use a monkey patch for an extension of the print function with an additional check for a this object and a property for printing.
// simple function with output
function print(s) {
console.log(s);
}
// apply monkey patch
void function () {
var p = print;
print = function () {
if (this && this.timeout) {
p.apply(this, arguments);
}
}
}();
// bind additional information
setTimeout(print.bind({ timeout: true }, '123'));
print('456');
I have an AngularJS factory that has multiple functions.
I want to call one of the functions inside the other function as shown below:
.factory("AppStart", function($cordovaSQLite) {
return {
init: function() {
var res = "hello";
console.log("in load start up page");
},
create_table: function() {
AppStart.init();
}
}
});
But I get the following error:
AppStart is not defined.
So how do I call the init() function in the create_table() function? I have tried just calling init(), but it doesn't work either.
To accomplish this, I recommend defining your functions with names, and then creating a service object with properties that refer to them, as I did below:
.factory("AppStart", function($cordovaSQLite) {
function init() {
var res = "hello";
console.log("in load start up page");
}
function create_table() {
init();
}
return {
init: init,
create_table: create_table
};
});
I have a function which calls itself recursively on a setTimeout. Problem is it loses its scope along the way.
So this is what I have...
var module = function () {
function init() {
if (notYetReadySoTryAgain) {
setTimeout(this.init,100);
return
}
}
}
The second time through I get an error that init cannot be found (on Window object).
What is the canonical way to deal with maintaining a reference to a module across a setTimeout?
Enclose the scope using self-execution; remove this as well.
var module = function () {
(function init() {
if (notYetReadySoTryAgain) {
setTimeout(init,100);
return
}
})(notYetReadySoTryAgain);
}
Remove this. and it will work.
var module = function () {
function init() {
if (notYetReadySoTryAgain) {
setTimeout(init,100);
return
}
}
}
Using setInterval can also be option for you.
try this:
var module = (function () {
(function init() {
if (notYetReadySoTryAgain) {
setTimeout(init,100);
return
}
})()
})()
I have written the following function.
function obj()
{
this.a;
}
obj.prototype.catch = function()
{
alert('Catched')
}
obj.prototype.do = function()
{
alert('called');
}
What i need is, to call obj::catch() after obj::do() is called and the call must be performed from inside obj::do()
So how to pass the local function of obj to setTimeout
i have tried
obj.prototype.do = function()
{
window.setTimeout('"'+this.catch+'()"',1000);
alert('called');
}
It does not worked
Then i tried
obj.prototype.do = function()
{
window.setTimeout('"'+this+'.catch()"',1000);
alert('called');
}
which gave me the following error on Chrome console
Uncaught SyntaxError: Unexpected token ILLEGAL
So i tried the following dirty method(is it really dirty ?)
obj.prototype.do = function()
{
this.pid = randomVal(100);
window['temp'+this.pid] = this;
window.setTimeout("temp"+this.pid+".catch();",1000);
alert('called');
}
function randomVal(bound)//returns a random number between 0 and <bound>
{
return (Math.floor(Math.random()*(bound)));
}
That worked.
so why the first two methods not worked.Is there any other way to do the same thing without global variables..
The second method and last method are almost similar .But why am i gettng the error in second method..?
The worked code can be found here
http://jsfiddle.net/jXhAs/
Don't pass strings to setTimeout … ever.
var self = this; // Because the scope will change
setTimeout(function () { self.catch() },1000);
Or if you are using JS 1.8.5:
setTimeout(this.catch.bind(this),1000);
You can read more about bind
You should pass a function to setTimeout (not a string):
Example:
var self = this;
setTimeout(function(){
self.catch();
},1000);
use a closure
obj.prototype.do = function()
{
window.setTimeout((function(that){
return function(){
that.catch();
};
})(this),1000);
alert('called');
}
Why go through all of this effort, just pass the function.
function obj() {
this.a;
}
obj.prototype.
catch = function() {
alert('Catched')
}
obj.prototype.do = function() {
setTimeout(this.
catch, 1000);
}
var test = new obj();
test.do();
var Test = (function() {
return {
useSub: function () {
this.Sub.sayHi();
},
init: function () {
$(document).ready(this.useSub);
}
};
})();
Test.Sub = (function () {
return {
sayHi: function () {
alert('hi');
}
};
})();
Test.useSub(); // works
Test.init(); // explodes
Above I am trying to create a Test namespace and add an object Sub to it. I was doing fine until I tried using the object in jQuery. The error is "Uncaught TypeError: Cannot call method 'sayHi' of undefined". If there is a better way to do this, I am open to it.
Edit:
Obviously this was demo code. In my real application the solution that I went with because I think it is the most clear is this one:
var Namespace (function () {
return {
init: function () {
$(document).ready(function() {
Namespace.onReady();
}
},
onReady: function() {
alert('Now I am back in the Namespace scope. Proceed as planned');
}
};
})();
Edit2: All jQuery callbacks seem to require they are used in this manner or else the scoping is screwed up.
I think it is a scope problem. If you do
$(document).ready(this.useSub);
then this.useSub will be executed in the window scope (so inside the function, this refers to the window object) and there doesn't exist a Sub attribute.
Try:
init: function () {
var obj = this;
$(function(){obj.useSub()});
}
For some reason it does not work using $(document).ready(function(){obj.useSub()}); but it works with the $() shortcut.
Here is one way
var Test = {
useSub : function () {
Test.Sub.sayHi();
},
init: function () {
$(document).ready(Test.useSub);
},
Sub: {
sayHi: function () {
alert('hi');
}
}
};
in this line:
$(document).ready(this.useSub);
you're passing a reference to a function and the scope is lost- when the function runs, this no longer means Test.