How to implement validating numbers in jquery
This article focuses on "how to achieve verification numbers in jquery". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "how to achieve verification numbers in jquery".
Method: 1, declare a regular expression to validate numbers, syntax for "var numbers / ^ [1-9] [0-9] + $/ gi;"; 2, in if statements to verify numbers using the test () method, syntax is "if (a.test (specified content)) {is a numeric code;} else {is not a numeric code;}".
The operating environment of this tutorial: windows10 system, jquery3.2.1 version, Dell G3 computer.
How to implement validating numbers in jquery
The function of judging numbers can be realized by writing regular expressions to validate numbers, using regular expressions to verify through the test () method in jquery, and then using if statements to judge. Here is an example of how to use jquery to determine whether it is a number or not.
Examples are as follows:
1. Create a new html file, named test.html, to explain how to use jquery to judge whether it is a number or not. Use the input tag to create an input box and set its id to myinput, which is mainly used to get the input object through this id below.
Use the button tag to create a button named "determine if it is a number". Bind the onclick click event to the button button, and execute the isnum () function when the button is clicked.
Within the js tag, create the isnum () function, within which you get the input object through the id value of input (myinput), then use the val () method to get the input, and write the regular expression "/ ^ [1-9] [0-9] + $/ gi" that validates the number.
2, in the isnum () function, use the if statement, through the test () method to determine whether the input is a number, if it is a number, then prompt "input correctly", otherwise, prompt "Please enter a number".
Open the test.html file in the browser, enter the contents in the text box, and click the button to see the effect of the implementation.
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