Trigger functions by clicking or bind click events by calling a function?

Question

Trigger functions by clicking or bind click events by calling a function?

I need help comparing two similar code snippets:

myFunc();

function myFunc() {
    var e = document.getElementByClassName("link"),
        i = e.length;
    while (i--) {
        e[i].addEventListener("click", function() {
            //do stuff for each a.link
        }, false);
    }
}

And

function myFunc() {
    //do stuff for each a.link
}

var e = document.getElementByClassName("link"),
    i = e.length;

while (i--) {
    e[i].addEventListener("click", function() {
        myFunc()
    }, false);
}

The first one allows me to use this like

var c = this.getAttribute("href")

to get the attribute of a.link.

However, the second one seems to have better performance since it calls myFunc() only when a.link is clicked

Which approach would be more efficient in terms of page speed?

EDIT
myFunc will be utilized multiple times during ajax calls.

javascript

Answer 1

Answer №1

It is essential for web developers to heed the advice from browser vendors regarding benchmarks. While vendors work on optimizing common processes, it's important not to overlook alternative methods that may gain popularity and become efficient in the future.

Upon reviewing your initial code snippet, I find it somewhat unconventional. It's best to prioritize simplicity over sacrificing readability and maintainability in pursuit of performance enhancements.

The original code snippet can be simplified as follows:

function handleClick() {
    console.log(this.href);
}

(function initListener() {
    var element = document.getElementById("link");
    element.addEventListener("click", handleClick, false);
})(); // immediate invocation

In this scenario, there isn't much benefit derived from enclosing the function within an immediately executed function. This approach might actually decrease performance.

f

The revision doesn't introduce significant changes. There is no hindrance preventing both examples from using the same click callback function. By adjusting how the click callback is invoked, you can retain the context of 'this' as needed.

Answer 2

It is essential for web developers to heed the advice from browser vendors regarding benchmarks. While vendors work on optimizing common processes, it's important not to overlook alternative methods that may gain popularity and become efficient in the future.

Upon reviewing your initial code snippet, I find it somewhat unconventional. It's best to prioritize simplicity over sacrificing readability and maintainability in pursuit of performance enhancements.

The original code snippet can be simplified as follows:

function handleClick() {
    console.log(this.href);
}

(function initListener() {
    var element = document.getElementById("link");
    element.addEventListener("click", handleClick, false);
})(); // immediate invocation

In this scenario, there isn't much benefit derived from enclosing the function within an immediately executed function. This approach might actually decrease performance.

f

The revision doesn't introduce significant changes. There is no hindrance preventing both examples from using the same click callback function. By adjusting how the click callback is invoked, you can retain the context of 'this' as needed.

Answer 3

Answer №2

When utilizing the event delegation model, the second approach proves to be the most effective. It not only enhances performance by eliminating an extra function call required in the first approach (where myFunc() is called for setup), but it also simplifies the handler code.

If you do not need to use myFunc() elsewhere in your code, you can streamline the handler like this:

var e = document.getElementById("link");
e.addEventListener("click", function() {
    // Perform all actions of myFunc here. The 'this' keyword will refer to the <a> tag
}, false);

Alternatively, you can keep myFunc() separate and skip the redundant function definition within the handler:

function myFunc() {
   // Execute necessary steps. When triggered by a click on the <a> tag,
   // 'this' refers to the <a> tag due to direct invocation by the handler.
   // Calling myFunc() outside this context will not assign 'this' to the <a> tag.
};

var e = document.getElementById("link");
e.addEventListener("click", myFunc, false);

Answer 4

When utilizing the event delegation model, the second approach proves to be the most effective. It not only enhances performance by eliminating an extra function call required in the first approach (where myFunc() is called for setup), but it also simplifies the handler code.

If you do not need to use myFunc() elsewhere in your code, you can streamline the handler like this:

var e = document.getElementById("link");
e.addEventListener("click", function() {
    // Perform all actions of myFunc here. The 'this' keyword will refer to the <a> tag
}, false);

Alternatively, you can keep myFunc() separate and skip the redundant function definition within the handler:

function myFunc() {
   // Execute necessary steps. When triggered by a click on the <a> tag,
   // 'this' refers to the <a> tag due to direct invocation by the handler.
   // Calling myFunc() outside this context will not assign 'this' to the <a> tag.
};

var e = document.getElementById("link");
e.addEventListener("click", myFunc, false);

Trigger functions by clicking or bind click events by calling a function?

Answer №1

Answer №2

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