How to Execute a Function Call from a String in JavaScript?

Invoking a Function Call from a String

In JavaScript, it is possible to convert a string representing a function call into an actual function call. Consider the case where we have a string like:

"clickedOnItem(" + t.parentNode.id + ")"

which we want to translate into the function call:

clickedOnItem(IdofParent);

To achieve this, we can utilize the following approach:

<code class="javascript">var fn = window[settings.functionName];
if(typeof fn === 'function') {
    fn(t.parentNode.id);
}</code>

In this snippet, we first retrieve the function reference from the window object using the string stored in settings.functionName. If the function exists, we proceed to invoke it with the desired arguments.

For example, if settings.functionName is set to "clickedOnItem", executing the code would result in:

<code class="javascript">var fn = window["clickedOnItem"]; // Fetch the function reference
fn(t.parentNode.id); // Invoke the function</code>

This effectively mimics the manual function invocation we aimed for. Remember that this approach is generally frowned upon due to potential security and maintainability concerns. Consider exploring safer alternatives, such as using the Function constructor or arrow functions, for dynamically constructing function calls.

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