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The problem is next: Assume that we have a select. Onchange event we need to call some function, but name of this function kept in variable. How to call this function ?
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Variables and functions share the same namespace in JavaScript, so they override each other. if function name and variable name are same then JS Engine ignores the variable. With var a you create a new variable. The declaration is actually hoisted to the start of the current scope (before the function definition).
Variables and functions have separate name spaces, which means a variable and a function can have the same name, such as value and value(), and Mata will not confuse them.
There are two methods to call a function from string stored in a variable. The first one is by using the window object method and the second one is by using eval() method. The eval() method is older and it is deprecated.
Define a function named "myFunction", and make it display "Hello World!" in the <p> element. Hint: Use the function keyword to define the function (followed by a name, followed by parentheses). Place the code you want executed by the function, inside curly brackets. Then, call the function.
window[name]()
You can call functions by name reference by selecting them as a property of window and executing them
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have you tried variableName(); ?
We often pass around callback functions, which might look something like this
function doSomething(callbackFunction){
// some happy code
callbackFunction()
}
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