Java Forms validation

Java Forms validation

1. Thinking: Through the form selector, the form attribute filter extracts the value of each form submission for validation
2. Implementation: JavaScript through OnSubmit () event, judge, return value false not commit, return true commit, jquery through the Submit () event
3. Forms validation common methods and events
A: Event onblur loses focus, onfocus gets focus
B: Method Blur () Move the Focus trigger method parameter focus () set the Focus trigger method parameter in the Text field select () Select the content trigger method parameter in the Text field
4. Regular Expressions:
A: define var reg =/^ expression format $/;
B: Match reg.test (str) returns a Boolean value
C: String method: Match () find match () matches search () retrieves the value of the domain regular expression match replace () replace the value of the match Expression split () split by expression
D: Common symbols for regular expressions: Refer to the help documentation.

Java Forms validation