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A checkbox (check box, tickbox, tick box) is a graphical widget that allows the user to make a binary choice, i.e. a choice between one of two possible mutually exclusive options. For example, the user may have to answer 'yes' (checked) or 'no' (not checked) on a simple yes/no question .
Implementations of these interface elements are available through JavaScript libraries such as jQuery. HTML 4 introduced the <label> tag, which is intended to represent a caption in a user interface, and can be associated with a specific form control by specifying the id attribute of the control in the label tag's for attribute. [ 1 ]
Lastly, we use jQuery's .click() to listen for clicks on this link, and when that happens, execute a function. After we call doQwikify() , it says event.preventDefault() . Since we clicked on a link, we need to tell the browser to prevent its default behavior (going to the URL, '#' ).
For example, jQuery can be used for finding an element in the document with a certain property (e.g. all elements with the h1 tag), changing one or more of its attributes (e.g. color, visibility), or making it respond to an event (e.g. a mouse click).
Later, JavaScript libraries such as jQuery abstracted away many of the day-to-day difficulties in cross-browser DOM manipulation, though better standards compliance among browsers has reduced the need for this.
Ext JS is a composition of classes that has many capabilities. Some examples: an abstract layer for browsers (e.g. Ext.isArray that can be used as a replacement for Array.isArray)
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This is for checkboxes --> Comments: <!-- This is a comment --> Comments can help in the understanding of the markup and do not display in the webpage.