jQuery break out of a foreach loop

Use jQuery's .each() function, when the target value is found, the foreach loop can be easily terminated without traversing the remaining results. Here is a simple jQuery code snippet:

let selectedIndex = -1; // 初始化为 -1，表示未找到

// 遍历列表中的项。如果找到选定项，则返回 false 以终止循环
$('ul#mylist li').each(function(index) {
  if ($(this).hasClass('selected')) {
    selectedIndex = index;
    return false; // 终止循环
  }
});

console.debug('Selected position is: ' + selectedIndex);

jQuery Terminate foreach loop FAQ (FAQ)

jQuery .each() What is the purpose of the function?

jQuery .each() Function is a powerful tool that allows you to iterate over jQuery objects. This function is used to loop through the attributes of an array's elements or objects. It is especially useful when you want to do the same for all elements in a collection or array.

How to terminate jQuery .each() loop?

To terminate the jQuery .each() loop, you can use the return false statement. This will immediately terminate the loop and prevent it from iterating over the remaining elements. However, it should be noted that this does not stop the execution of the function containing the loop.

Can I use the break statement to exit jQuery .each() loop?

No, you cannot use the break statement to exit the jQuery .each() loop. The break statement is used to exit the traditional for or while loop. In the context of a jQuery .each() loop, using return false is the correct way to exit the loop.

How to continue with the next iteration in a jQuery .each() loop?

To continue with the next iteration in the jQuery .each() loop, you can use the return true statement. This will skip the current iteration and continue with the next iteration.

How to terminate jQuery .each() loop at a specific index value?

Yes. Check the index value within the loop and use return false when the index matches the value to exit the loop.

Is it possible to use .each() statements in jQuery continue loops?

No, you cannot use the .each() statement in the jQuery continue loop. The continue statement is used in the traditional for or while loop. In the context of a jQuery .each() loop, use return true equivalent to the continue statement.

How to access the current element in jQuery .each() loop?

In the jQuery .each() loop, the current element can be accessed using the this keyword. This keyword refers to the current element in the loop.

Can a jQuery .each() loop be used with an object?

Yes. The loop will iterate over the object's properties, where you can access the current property name and value.

How to use jQuery .each() loop with array?

To use a jQuery .each() loop with an array, just pass the array as the first parameter to the .each() function. Within the loop, you can access the current index and value.

Can I nest jQuery .each() loop?

Yes. This is useful when you want to iterate over multidimensional arrays or objects. However, be aware that nested loops can cause code complexity, difficult to understand and maintain.

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