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For example, a form input element could be accessed as either document.myForm.myInput or document.forms[0].elements[0]. The Legacy DOM enabled client-side form validation and simple interface interactivity like creating tooltips.
"Do not make any assumptions": Defensive programming techniques should allow for the possibilities that JavaScript may not run, the browser may not support expected methods, the HTML may have changed, unexpected input devices may be in use and other scripts may either not be present or may be encroaching on the global namespace.
The jQuery function is a factory for creating a jQuery object that represents one or more DOM nodes. jQuery objects have methods to manipulate these nodes. These methods (sometimes called commands) , are chainable as each method also returns a jQuery object.
Setting or clearing ("unclicking") a checkbox changes the checkbox's state with no other side-effects.Violating this guideline by associating additional actions with the change of state frequently confuses users, because they are used to configuring data in entry controls such as text boxes, radio buttons, and checkboxes and then invoking an action control such as a push button to initiate the ...
Use a form to capture user input, and then process, verify and respond to that data without having to send data back to the server. Include rollover buttons or drop-down menus. A less common use is to create browser-based action games.
RFC 1867 also introduced the accept attribute for the input element. This would enable file-type filtering based on MIME type for the file-select control. In addition, it is proposed that the INPUT tag have an ACCEPT attribute, which is a list of comma-separated media types.
We will be writing a user script by modifying your common.js. For the purpose of this tutorial, we will write a simple version of the Quick wikify module, which adds the {{Wikify}} maintenance template to the top of an article when you click a link called "Wikify" in the "More" menu.
In July 2005, George Jempty suggested an optional variable assignment be prepended to JSON. [19] [20] The original proposal for JSONP, where the padding is a callback function, appears to have been made by Bob Ippolito in December 2005 [21] and is now used by many Web 2.0 applications such as Dojo Toolkit and Google Web Toolkit.