How to get id with jquery-Front-end Q&A-php.cn

How jQuery gets the ID of an element

In web development, jQuery is a widely used Javascript library for simplifying DOM manipulation and event handling. Getting the ID of an HTML element is one of the most basic tasks in jQuery. Fortunately, jQuery provides many flexible methods to easily obtain IDs.

1. Use the $() method

The core function of jQuery is "$()", also known as the "selector function". We can pass a string parameter to find matching HTML elements. If we want to get the ID of an element, we only need to wrap the ID with the "#" symbol. For example:

var myElement = $("#my-div").get(0);

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In this example, we first use the "#" symbol to wrap the ID of the target element, and then use jQuery's "get()" method to get the HTML element corresponding to the ID. Please note that since jQuery's selectors are based on CSS, we can use CSS selectors to implement more complex selection operations.

2. Use the attr() method

Another way to get the element ID is to use jQuery's "attr()" method. This method can be used to get the value of an HTML attribute and can be used with other selector methods. For example:

var myElement = $("div").attr("id", "my-div");

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In this example, we use jQuery's selector method to find all

elements, and use the "attr()" method to set the ID attribute of the first matching element to "my- div". Next, we can use the "get()" method to get a reference to the element.

3. Use the prop() method

If we want to get the "id" attribute of the element, we can also use jQuery's "prop()" method to complete it. Similar to " attr() ", we can use the selector to get the matching element and the " prop() " method to get its " id " attribute. For example:

var myElementID = $("div").prop("id");

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In this example, we use the selector to find all

elements and use the "prop()" method to get the ID attribute of the first matching element. Note that this method returns a string type.

4. Use the get() method

Finally, we can also use jQuery’s “get()” method to get a reference to an HTML element. This method accepts an index parameter and returns the matching element. For example:

var myElement = $("div").get(0);
var myElementID = myElement.id;

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In this example, we first use the selector to find all

elements, and then use the "get()" method to get the reference of the first matching element. Next, we can use Javascript's "id" attribute to get the ID attribute value of the element.

To sum up, by using the selector, attribute search, DOM access and other methods provided by jQuery, you can easily obtain the ID of the HTML element. These methods not only provide convenient access to element IDs, but also expand the application scope of jQuery, making it one of the most popular web development tools.

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