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

An Array

Supply an array in the data-val-checkAgainst attribute. The input field's value must match one of the array values.

Example:

<input type="text" name="array"  data-val-required="1"  data-val-checkAgainst="['United States', 'Japan', 'Bangladesh']"  />

Country Will only accept - 'United States', 'Japan', 'Bangladesh'