Validation Types

How many different ways or types of validation can we carry out.

• → Scenarios: When to Validation
• → Required Inputs
• → Min-Length Validation
• → Data Type Validation
• → Custom Expression Validation

Custom Expression Validation

Whether a field is required or not, a field can be checked against a number of custom expressions. If a field is not required, the custom expression validation is checked only if the input has value.

The input attribute data-val-checkAgainst is used to specify a number pre-defined type of expressions.

You can test for the following types of custom expressions:

Equal To | Another Input | An Array | Numeric Operators | String Operators | Date Operators | RegEx Expression

RegEX

Supply a RegEx expression in the data-val-checkAgainst attribute to test the value against. RegEx expressions start with a prefix (regex: ), then a space and then the expression such as [4-9].

Example:

<input type="text" name="regex1"  data-val-required="1"  data-val-checkAgainst="regex: [4-9]"  />
<input type="text" name="regex2"  data-val-required="1"  data-val-checkAgainst="regex: ^[4-9]$"  />
<input type="text" name="regex3"  data-val-required="1"  data-val-checkAgainst="regex: ^New( )(York|Hampshire|Mexico)$"  />

Regex Must have a number between 4 and 9 in the value Regex The value must be between the numbers 4 and 9 Regex Must be New York, New Hampshire or New Mexico