How to determine whether jquery contains an id element

Method: 1. Use the attr() method to obtain the id attribute value of the specified element, the syntax is "$(element).attr('id')"; 2. Use the if statement and the "==" operation Just use the symbol to determine whether it contains an id. 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 jquery determines whether it contains an id element

In jquery, you can obtain the element object and use the attr() method to obtain the id attribute value to determine whether the element has a certain id. The following is an example of how jquery determines whether an element has a certain id.

The example is as follows:

Create a new html file and name it test.html, which is used to explain jquery's judgment of whether an element has a certain id. Use the div tag to create a line of text, and set the div's id to tsdiv, which will be used to determine whether the id exists using the jquery method below. Use the button tag to create a button with the button name "Judge element id". Bind the onclick click event to the button button. When the button is clicked, the panduan() function is executed.

In the js tag, create the panduan() function. Within the function, obtain the div object through the element name (div), and use the attr() method to obtain the attribute value of the id. , 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. If they are equal, it will prompt "id exists, and the id attribute value is: xxx". Otherwise, it will prompt "id does not exist." Attributes".

Output results:

Recommended related video tutorials: jQuery video tutorial

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