Javascript validating numeric input

Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.For a more detailed introduction to HTML5 form validation you can find some great articles linked under References below.Because the code is stored on the server, server-side validation requires a roundtrip to the server.Numeric validation becomes important if multiple numeric fields are required on a page, especially if their values are to be summed or used in some mathematical function.by Christopher Heng, Many websites, like thesitewizard.com, have a feedback form of some sort so that visitors can make comments to the webmasters.If you have such a form on your site, I'm sure that from time to time, you would have received the results of your form with some essential field (like the email address or the visitor's name, or even the feedback itself) omitted. One way around it is to validate the essential fields with a simple Java Script.(For more information on how to create form validation using the Front Page form feature, see About creating forms in Front Page 2003.) However, if the form validation provided in Front Page does not suit your needs or the site on which you are working is hosted on a server that does not have Front Page Server Extensions from Microsoft installed, you may need to create custom form validation.Note Front Page Server Extensions are a set of programs that provide access to special Front Page features, such as database processing, form processing, hit counters, and other built-in Front Page components that require server-side processing.

(16 printed pages) Introduction Getting Started Writing the Validation Script Connecting the Form to the Script Associating Form Fields with Custom Script Code Listing Conclusion When you create forms, providing form validation is useful to ensure that your customers enter valid and complete data.

To make the web browser check that a field is not empty, you will need to add a call to your validation function when the form is submitted.

The option of using pure HTML, sometimes with a touch of CSS, to complement Java Script form validation was until recently unthinkable.

If non numeric values are added, multiplied, etc, then the answer becomes nonsense.

ASP can perform numeric validation, but only once all the data has been submitted to the server, then the user must correct any invalid fields and resubmit the page.

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The purpose of a form validation script is to return a boolean value ('s to reference form fields, but that can lead to namespace conflicts and why make things more complicated than necessary.

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