I have a function to clear the user text,but the clearText function is inside the function and variable.
I find some information on Internet,but some solutions are only solve the function in variable and have not two function.
Can anyone tell me how I would call the function in function and variable,please?
And I am sorry about grammar ,English is not my mother language.I am hard to translate using google translate.
Calling a JavaScript function named in a variable
I try it but got undefined.
<script>
var testing = (function(){
function clearText(){
/* call other function in this testing function */
}
/* other function */
})();
function resetInput() {
/* I call clearText() function here */
}
</script>
Unless your first function returns clearText (or makes it accessible outside of that function in some other way), you cannot use it in resetInput.
If it does return clearText, then you can use it via testing:
var testing = (function(){
function clearText(){
console.log('clearText() triggered');
/* some code*/
}
/* some function */
return clearText; // ****
})();
function resetInput() {
testing(); // ****
}
resetInput();
If it makes clearText available in some other way (a global variable, etc.), how you'd use it would depend on what that other way is.
What you are using is IIFE (immediately Invoked Function Expression). What you do in the following code is inserting the return of nothing into the variable testing.
Execute the following :
var testing = (function() {
function clearText() {
console.log('clearText execution');
}
})();
console.log(testing);
Now what if we return something :
var testing = (function() {
function clearText() {
console.log('clearText execution');
}
return 'try';
})();
console.log(testing);
If you want to execute the function clearText outside of the IIFE, you have to return a pointer to it, like :
var testing = (function() {
function clearText() {
console.log('clearText execution');
return 'done';
}
return clearText;
})();
console.log(testing);
console.log(testing());
Now, there is no need for IIFE, you could just store the function inside of object and use the reference :
var testing = {
clearText: () => {
console.log('clearText execution');
return 'done';
}
};
function resetInput() {
testing.clearText()
}
resetInput();
Related
I'm trying to call a function inside a function outside the main one:
var myFunction = function myFunct(element) {
function tryIt(){
alert("hello");
};
return{
tryIt: tryIt
}
}
And I'm try to call "tryIt" function outside myFunct with
myFunction.tryIt
But it doesnt work.
how can I do this?
First, you need is to call the function and then call the function of the returned object of the property tryIt.
var myFunction = function myFunct(element) {
function tryIt(){
alert("hello");
}
return {
tryIt: tryIt
};
};
myFunction().tryIt();
// ^^ calls myFunction
// ^^^^^^^^^ returns object with function tryIt
// ^^ calls tryIt
function myFunct() {
function tryIt() {
console.log("hi");
}
return {
tryIt: tryIt
};
}
var foo = myFunct();
foo.tryIt();
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() {
});
I am trying to create a function that can then return many functions based on an input. Here is an example of the problem I am facing.
var giveFunction = function(text) {
return function(text) {
console.log(text)
}
}
var test = giveFunction('this is a test');
test()
Running test() at the end prints undefined instead of 'this is a test.' Is there any way around this problem?
The inner function should not contain any parameter,
var giveFunction = function(text) {
return function() {
console.log(text)
}
}
Let it create a closure. If it has a parameter then that would be read during execution and undefined would be printed as you are not calling that function with any arguments.
If you want your code to be working then you have to use bind for that,
var giveFunction = function(text) {
return function(text) {
console.log(text)
}.bind(null, text)
}
var test = giveFunction('this is a test');
test(); //'this is a test'
Lets go one step further and ask why?
var outerFunction = function(outerParameter) {
return innerFunction function(innerParameter) {
// in here we have access to anything in this function and the outer function
// all the way to out the the global scope
// therefore, we dont need to pass innerParameter in again as a parameter! ( in your case we 'next')
}
/// now over here, outside of innerFunction, we do NOT have access to innerParameter!
}
So applying the above principles to your code we have:
var giveFunction = function(text) {
return function() {
console.log(text)
}
}
var test = giveFunction('this is a test');
test()
which now works!
Finally, checkout the most upvoted post under the javascript tag:
How do JavaScript closures work?
I just can't reach the function inside function using only HTML.
How to call setLayout() using only HTML or is it able to call only in Javascript?
<button onclick="customize.setLayout('b.html');">Click Please</button>
Javascript:
function customize() {
function setLayout(text) {
var selectedLayout = text;
layout += selectedLayout;
$.get(layout, function (data) {
$("#layout-grid").html(data);
});
}
}
It isn't possible to call setLayout at all.
Functions defined in other functions are scoped to that function. They can only be called by other code from within that scope.
If you want to to be able to call customize.setLayout then you must first create customize (which can be a function, but doesn't need to be) then you need to make setLayout a property of that object.
customize.setLayout = function setLayout(text) { /* yada yada */ };
Multiple ways to call a function within a function. First of all, the inner function isn't visible to the outside until you explicitly expose it Just one way would be:
function outerobj() {
this.innerfunc = function () { alert("hello world"); }
}
This defines an object but currently has no instance. You need to create one first:
var o = new outerobj();
o.innerfunc();
Another approach:
var outerobj = {
innerfunc : function () { alert("hello world"); }
};
This would define an object outerobj which can be used immediately:
outerobj.innerfunc();
if you insist to do it this way, maybe define setLayout and then call it,
something like this:
<script>
function customize(text, CallSetLayout) {
if (CallSetLayout) {
(function setLayout(text) {
//do something
alert(text);
})(text);
}
}
</script>
<button onclick="customize('sometext',true);">Click Please</button>
then you can decide if you even want to define and call setLayout from outside
Simple answer: You can't call setLayout() with this setup anywhere!
The reason being, setLayout() will not be visible outside of customize() not even from other JavaScript code because it is defined locally inside customize() so it has local scope which is only available inside customize(). Like others have mentioned there are other ways possible... (^__^)
You can return the response of setLayout() by returning it as a method of customize() and use it in your HTML like customize().setLayout('b.html'); e.g.
<button onclick="customize().setLayout('b.html');">Click Please</button>
JavaScript:
function customize() {
var setLayout = function (text) {
var selectedLayout = text;
layout += selectedLayout;
$.get(layout, function (data) {
$("#layout-grid").html(data);
});
};
return {
setLayout: setLayout
};
}
Another Approach
You can also define your main function i.e. customize as Immediately-Invoked Function Expression (IIFE). This way you can omit the parenthesis while calling its method in HTML section.
<button onclick="customize.setLayout('b.html');">Click Please</button>
JavaScript
var customize = (function () {
var setLayout = function (text) {
var selectedLayout = text;
layout += selectedLayout;
$.get(layout, function (data) {
$("#layout-grid").html(data);
});
};
return {
setLayout: setLayout
};
})();
You need to treat it as object and method
<button onclick="customize().setLayout('b.html');">Click Please</button>
Sorry I had to edit this code for more clarification
function customize() {
this.setLayout = function setLayout(text) {
var selectedLayout = text;
layout += selectedLayout;
$.get(layout, function (data) {
$("#layout-grid").html(data);
});
}
return this;
}
I'm self-teaching myself JavaScript and out of curiosity I'm wondering what is the proper way of returning a value from one function to be used in another function. For example:
function firstFunction() {
// do something;
return somevalue
}
So how do I set up the second function to use somevalue? Thanks.
Call the function and save the return value of that very call.
function firstFunction() {
// do something
return "testing 123";
}
var test = firstFunction(); // this will grab you the return value from firstFunction();
alert(test);
You can make this call from another function too, as long as both functions have same scope.
For example:
function testCase() {
var test = firstFunction();
alert(test);
}
Demo
You could call firstFunction from secondFunction :
function secondFunction() {
alert(firstFunction());
}
Or use a global variable to host the result of firstFunction :
var v = firstFunction();
function secondFunction() { alert(v); }
Or pass the result of firstFunction as a parameter to secondFunction :
function secondFunction(v) { alert(v); }
secondFunction(firstFunction());
Or pass firstFunction as a parameter to secondFunction :
function secondFunction(fn) { alert(fn()); }
secondFunction(firstFunction);
Here is a demo : http://jsfiddle.net/wared/RK6X7/.
Call function within other function :
function abc(){
var a = firstFunction();
}
function firstFunction() {
Do something;
return somevalue
}
You can do this for sure. Have a look below
function fnOne(){
// do something
return value;
}
function fnTwo(){
var strVal= fnOne();
//use strValhere
alert(strVal);
}
var captcha = '';
//function name one
function one(captcha){
var captcha = captcha;
//call another function and pass variable data
var captcha = firstFunction(captcha);
};
// second function name
function firstFunction(captcha){
alert(captcha);
}
To copy the return value of any javascript(in chrome console), we can use inbuilt copy() method.
you can use any expression, function, etc
find some examples below
using expresseion
a = 245;
copy(a);
using function
a = function() {
return "Hello world!"
}
copy(a());
Official Doc for reference