Javascript dynamically invoke object method from string
JavascriptOopDynamicMethodsInvokeJavascript Problem Overview
Can I dynamically call an object method having the method name as a string? I would imagine it like this:
var FooClass = function() {
this.smile = function() {};
}
var method = "smile";
var foo = new FooClass();
// I want to run smile on the foo instance.
foo.{mysterious code}(); // being executed as foo.smile();
Javascript Solutions
Solution 1 - Javascript
if the name of the property is stored in a variable, use []
foo[method]();
Solution 2 - Javascript
Properties of objects can be accessed through the array notation:
var method = "smile";
foo[method](); // will execute the method "smile"
Solution 3 - Javascript
When we call a function inside an object, we need provide the name of the function as a String.
var obj = {talk: function(){ console.log('Hi') }};
obj['talk'](); //prints "Hi"
obj[talk]()// Does not work
Solution 4 - Javascript
method can be call with eval
eval("foo." + method + "()");
might not be very good way.
Solution 5 - Javascript
I would like to leave an example here for this. For example; i want to call a dynamically check method while submitting the form.
<form data-before-submit="MyObject.myMethod">
<button type="submit">Submit</button>
</form>
$('form').on('submit', function(e){
var beforeSubmit = $(this).attr('data-before-submit');
if( beforeSubmit ){
params = beforeSubmit.split(".");
objectName = params[0];
methodName = params[1];
result = window[objectName][methodName]($(this));
if( result !== true ){
e.preventDefault();
}
}
});
var MyObject = {
myMethod = function(form){
console.log('worked');
return true;
}
};