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This article mainly introduces jquery how to judge whether it contains a certain id element, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Methods: 1, use the attr () method to get the id attribute value of the specified element, the syntax is "$(element). Attr ('id')"; 2, use the if statement and the "= =" operator to determine whether it contains an id or not, and the syntax is "if (id attribute value object = = specified id value) {contains code} else {does not contain code}".

The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.

How does jquery determine whether it contains an id element?

In jquery, you can determine whether an element has an id by getting the element object and using the attr () method to get the attribute value of the id. The following editor gives an example of jquery to determine whether an element has a certain id.

Examples are as follows:

Create a new html file, named test.html, which is used to explain jquery to determine whether the element has an id. Use the div tag to create a line of text, and set the id of the div to tsdiv, which is used to determine whether the id exists using the jquery method below. Use the button tag to create a button named "judgment element id". Bind the onclick click event to the button button, and execute the panduan () function when the button is clicked.

In the js tag, create the panduan () function. Within the function, get the div object through the element name (div), use the attr () method to get the attribute value of id, and save the value in the id variable.

In the panduan () function, use the if statement to determine whether the id obtained in the previous step is equal to tsdiv, and if so, it prompts "there is an id,id attribute whose value is: xxx", otherwise, it prompts "there is no id attribute".

Output result:

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