username validation in javascript

-bit number: ^\d{n}$ Verify at least n digits: ^\d{n,}$ Verify the number of m-n bits: ^\d{m,n}$ Verify numbers beginning with 0 and non 0: ^ (0|[ 1-9][0-9]*) $ Verify positive real number with two decimal digits: ^[0-9]+ (. [ 0-9]{2})? $ Verify positive real number with 1-3 decimal digits: ^[0-9]+ (. [ 0-9]{1,3})? $ To validate a Non-zero positive integer: ^\+? [1-9] [0-9]*$ Validation of nonzero negative integers: ^\-[1-9][0-9]*$ Verify nonn

Example: Verify that the input is a number, whether to meet the number of digits, if the error, and a friendly reminder. Effect Chart: This example above contains many commonly used forms validation code, which is shared below: 1, verify the form 2. Verify Nickname 3. Calculate Nickname length 4. Verify that the nickname is present 5, verify the mobile phone number 6, verify the password 7, verify the mailbox 8. Verify the v

For new or new import projects that have no project settings Get rid of Eclipse's JS validation: Will Windows->preference->java script->validator->errors/warnings-> Enable Javascript sematic Validation The front of the hook to remove; For an existing project:To modify a. Project file:Locate the project directory and delete the following sections in the. proje

The CheckBox control, because its value is selected and not selected. Therefore, when submitting the data, want to let the user must choose CheckBox, under normal circumstances, not to do validation. But we can use Asp:customvalidator to verify, but we have to write custom validation JavaScript code, can refer to the following: Copy Code code as follows:

constructor.The above example should be well understood, constructor.prototype.publicName is changing the properties in the template, Object1.publicname just changes the properties in the Object1 object's copy.5. Static attribute AnalysisIt also explains the principle of static property, which is actually a property of the MyClass template, and the object does not contain this attribute except in the template. objects that want to access static properties can only be passed constructor.1 functi

original filled all emptied, then the crazy.According to the principle of graceful degradation of JavaScript, the page should be disabled in the case of JS can still be used normally. Although the user experience may be poor, some effects, but the basic functions are still achievable, so, do not rely too much on JS, the service side of the verification has to be verified.Write server program, give you a reminder: Do not trust any client data, JS is o

First step:Get rid of Eclipse's JS validation:Will Windows->preference->java script->validator->errors/warnings->Enable Javascript sematic Validation The front of the hook to remove; Step Two:Right-key Item-> Properties-> Builders Remove the hook in front of JavaScript ValidatorIf there is no JavaScript validator this

JavaScript Tutorial User Name VerificationThe following check function if the user enters any user name in all fields. If it is not empty, we check the length of the string and allow a unique username of 5 to 15 characters. Next, we use JavaScript regular expressions/tiles/disallow the illegal characters that appear in the user name. We want to allow only letters

Form validation is essential for almost every website that needs to be registered or logged in. Some of the validation is very complex, it can be said that a variety of requirements for you, but this chapter only describes the simplest form of validation, is to determine whether the empty, some of the requirements of the lower Web site has been satisfied with the

JavaScript forms verify Chinese capital letters, and determine whether an input is in Chinese or uppercase letters, and is implemented by regular expressions.Check if it is a valid real name and can only contain Chinese or uppercase English lettersfunction Isvalidtruename (strName) {var str = Trim (strName); Determines whether it is a full English capital or full Chinese, and can contain spacesvar reg =/^[a-z u4e00-u9fa5]+$/;http://rl.82676666.comif (