Using modulus will work: num % 1 != 0 // 23 % 1 = 0 // 23.5 % 1 = 0.5 Note that this is based on the numerical value of the number, regardless of format. It treats numerical strings containing whole numbers with a fixed decimal point the same as integers: ‘10.0’ % 1; … Read more
This will do: /^(apple|banana)$/ to exclude from captured strings (e.g. $1,$2): (?:apple|banana) Or, if you use a standalone pattern: apple|banana
If “validation failure” means that there is some client error in the request, then use HTTP 400 (Bad Request). For instance if the URI is supposed to have an ISO-8601 date and you find that it’s in the wrong format or refers to February 31st, then you would return an HTTP 400. Ditto if you … Read more
If you want to disable client side validation for a form in HTML5 add a novalidate attribute to the form element. Ex: <form method=”post” action=”/foo” novalidate>…</form> See https://www.w3.org/TR/html5/sec-forms.html#element-attrdef-form-novalidate
$(‘#apply-form input’).blur(function() { if( !$(this).val() ) { $(this).parents(‘p’).addClass(‘warning’); } }); And you don’t necessarily need .length or see if it’s >0 since an empty string evaluates to false anyway but if you’d like to for readability purposes: $(‘#apply-form input’).blur(function() { if( $(this).val().length === 0 ) { $(this).parents(‘p’).addClass(‘warning’); } }); If you’re sure it will always … Read more
In general URIs as defined by RFC 3986 (see Section 2: Characters) may contain any of the following 84 characters: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-._~:/?#[]@!$&'()*+,;= Note that this list doesn’t state where in the URI these characters may occur. Any other character needs to be encoded with the percent-encoding (%hh). Each part of the URI has further restrictions about … Read more
The simplest way to accomplish this is to put the input method in a while loop. Use continue when you get bad input, and break out of the loop when you’re satisfied. When Your Input Might Raise an Exception Use try and except to detect when the user enters data that can’t be parsed. while … Read more
This issue occurs on Chrome if a form field fails validation, but due to the respective invalid control not being focusable the browser’s attempt to display the message “Please fill out this field” next to it fails as well. A form control may not be focusable at the time validation is triggered for several reasons. … Read more
Note: This is an updated answer. Comments below refer to an old version which messed around with keycodes. jQuery Try it yourself on JSFiddle. There is no native jQuery implementation for this, but you can filter the input values of a text <input> with the following inputFilter plugin (supports Copy+Paste, Drag+Drop, keyboard shortcuts, context menu … Read more
Better option… just strip all non-digit characters on input (except ‘x’ and leading ‘+’ signs), taking care because of the British tendency to write numbers in the non-standard form +44 (0) … when asked to use the international prefix (in that specific case, you should discard the (0) entirely). Then, you end up with values … Read more