Validating textbox using javascript


07-Dec-2019 14:27

x,y and z (word) – find the “word” specified in the round brackets [abc|xyz] – find either the characters a,b,c or x,y,z We’ll start first with validating a textbox that accepts only numbers.So the condition is we check whether the textbox contains anything ELSE other than numbers and display a message As you can see the function validate() checks if the entered string contains characters that does NOT (notice the ^ symbol) match the numbers 0 to 9 including white spaces and special characters.Reg Exp for basic javascript validation read Javascript Validation – Textbox Combobox Radiobutton Checkbox.Using regular expressions the entered content can be validated with advanced conditions like the string entered shouldn’t contain spaces, special characters, numbers, uppercase or lowercase etc.To find out which value (if any) has been selected, you need to loop through the array until you find which one has been selected: defines a locally scoped variable.If you're working with arrays of checkboxes to submit data to a server-side script then you might already have some grey hairs from trying to figure out how to validate the input using Java Script.

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User-submitted data should also be verified using a secure server-side script.

Otherwise a browser with Java Script disabled, or a hacker trying to compromise your site, can easily by-pass client-side validation.



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