jQuery get numbers only from element id

Extract numbers from element ID: Detailed explanation of jQuery method

Assuming that the item ID is stored in the ID attribute of the element container, we only need to extract the number from it. It is easy to implement with simple JavaScript regular expression replacement statements.

<code class="language-javascript">$(this).attr('id').replace(/[^d]/g, '');</code>

For example: container1 will become 1.

If the ID attribute contains both letters and numbers, and we are only interested in numbers, such as getting numbers from the div container ID, this is very useful when getting the ID of the parent container element:

<code class="language-javascript">//元素...
//带有绑定点击事件的按钮...
//元素...
//带有绑定点击事件的按钮...
//元素...
//带有绑定点击事件的按钮...</code>

When clicking on any element, we can get its container ID.

<code class="language-javascript">//仅从元素获取容器ID数字
function getIdNum(elem) {
    if (elem.attr('id')) {
        return elem.attr('id').replace(/[^d]/g, '');
    } else {
        return elem.parents('.widget').attr('id').replace(/[^d]/g, '');
    }
}

//示例调用
var containerId = getIdNum($('some button'));</code>

jQuery Number and Element ID FAQ

How to use jQuery to select elements by ID?

Use jQuery to select an element by ID, and use the "#" symbol followed by the element's ID. For example, if the element ID is "myElement", the method to select it in jQuery is: $("#myElement"). This will return a jQuery object that you can use to manipulate elements.

Can element ID use numbers?

Yes, element IDs can use numbers, but IDs cannot start with numbers. For compatibility with CSS and JavaScript, it should start with letters. For example, "id1" is a valid ID, but "1id" is invalid.

How to use jQuery to get the value of element ID?

You can use the attr() method in jQuery to get the value of the element ID. For example, if the element ID is "myElement", the method to obtain its ID is: $("#myElement").attr("id"). This will return the string "myElement".

What is the difference between ID and class in jQuery?

In jQuery, ID is the unique identifier of an element, and class can be used to identify multiple elements. You can use the "#" symbol to select elements by ID, and use the "." symbol to select elements by class. For example, $("#myElement") selects an element with ID "myElement", and $(".myClass") selects all elements with class "myClass".

Can special characters be used in element IDs?

Yes, element IDs can use special characters, but in jQuery you must use two backslashes for escape. For example, if the element ID is "my:Element", the method to select it in jQuery is: $("#my\:Element").

How to change the ID of an element using jQuery?

The element's ID can be changed using the attr() method in jQuery. For example, if you want to change the element's ID from "oldID" to "newID", the method is: $("#oldID").attr("id", "newID").

How to use jQuery to select multiple elements with the same ID?

In HTML, the ID should be unique within a page. Therefore, there should not be multiple elements with the same ID. If so, jQuery will only choose the first one. If you want to select multiple elements, you should use class.

Can I use jQuery to select elements by attribute?

Yes, you can use jQuery to select elements by attribute. For example, to select all elements with a specific data attribute, you can use: $("[data-myAttribute]"). This will select all elements with the "data-myAttribute" attribute.

How to select elements by ID using pure JavaScript?

In pure JavaScript, you can use the document.getElementById() method to select elements by ID. For example, if the element ID is "myElement", the method to select it is: document.getElementById("myElement").

Can I use jQuery to select elements by tag name?

Yes, you can use jQuery to select elements by tag name. For example, to select all div elements, you can use: $("div"). This will select all div elements on the page.

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