I have a form that I would like all fields to be filled in. If a field is clicked into and then not filled out, I would like to display a red background. And you don't necessarily need. If you're sure it will always operate on a textfield element then you can just use this. Doing it on blur is too limited.

It assumes there was focus on the form field, so I prefer to do it on submit, and map through the input.

After years of dealing with fancy blur, focus, etc. Consider using the jQuery validation plugin instead. It may be slightly overkill for simple required fields, but it mature enough that it handles edge cases you haven't even thought of yet nor would any of us until we ran into them.

It's even hosted on the Microsoft CDN too, for speedy delivery: There is one other thing you might want to think about, Currently it can only add the warning class if it is empty, how about removing the class again when the form is not empty anymore.

Here is an example using keyup for the selected input. It uses a trim as well to make sure that a sequence of just white space characters doesn't trigger a truthy response.

This is an example that can be used to begin a search box or something related to that type of functionality. With HTML 5 we can use a new feature "required" the just input value jquery empty it to the tag which you hedging in the foreign exchange market refers to to be required like:.

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Trying to set input values to empty string ("") results in setting them to "undefined" · Issue #53 · mathiasbynens/jquery-placeholder · GitHub

Here is my code: What am I doing wrong? Keith Donegan 9, 25 80 Only element nodes and text including whitespace are considered. Comments or processing instructions do not affect whether an element is considered empty or not. I validate length of fields so infrequently that I completely overlooked. Everybody has the right idea, but I like to be a little more explicit and trim the values.

jQuery Function to All Clear Form Data — SitePoint

Alex Sexton 9, 1 20 Trimming is necessary, especially when using finicky WYSIWYG editors like jWYSIWYG, for example. Kilian Lindberg Mar 20 '14 at Jamie Pate 9 I believe that only tests whether the field started out with a value attribute. It doesn't test the actual form field value like you'd need for validation. Zigri 3 CMS k Frankie Loscavio 4 Mauro 6 You can try something like this: Kote 1, 17 Maher 1, 1 6 You probably need to trim the whitespace as well.

With HTML 5 we can use a new feature "required" the just add it to the tag which you want to be required like: And all browser don't support this Stack Overflow works best with JavaScript enabled.

I think that it will work better if you change from: This doesn't work in jQuery 1. MathOverflow Mathematics Cross Validated stats Theoretical Computer Science Physics Chemistry Biology Computer Science Philosophy more 3. Meta Stack Exchange Stack Apps Area 51 Stack Overflow Talent.