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What is ID selector?

Posted By :Prasanti Prusty     Posted Date :January 22, 2010    Points :10   Category :ASP.Net 
ID selector is an individually identified (named) selector to which a specific style is declared. Using the ID attribute the declared style can then be associated with one and only one HTML element per document as to differentiate it from all other elements. ID selectors are created by a character # followed by the selector's name. The name can contain characters a-z, A-Z, digits 0-9, period, hyphen, escaped characters, Unicode characters 161-255, as well as any Unicode character as a numeric code, however, they cannot start with a dash or a digit.

#abc123 {color: red; background: black}

<P ID=abc123>This and only this element can be identified as abc123 </P>

You can also find related Interview Question to What is ID selector?  below: 

What is contextual selector?

  
Contextual selector is a selector that addresses specific occurrence of an element. It is a string of individual selectors separated by white space, a search pattern, where only the last element in the pattern is addressed providing it matches the specified context.

TD P CODE {color: red}

The element CODE will be displayed in red but only if it occurs in the context of the element P which must occur in the context of the element TD.

TD P CODE, H1 EM {color: red}

The element CODE will be displayed in red as described above AND the element EM will also be red but only if it occurs in the context of H1

P .footnote {color: red}

Any element with CLASS footnote will be red but only if it occurs in the context of P

P .footnote [lang]{color: red}

Any element with attribute LANG will be red but only if it is classed as "footnote" and occurs in the context of P (More...)

Can I attach more than one declaration to a selector?

  
Yes. If more than one declaration is attached to a selector they must appear in a semi colon separated list. (More...)

Why element selector is used inJQuery ?

  
Element selector inJQuery selects elements based on their tag name.e.g. Syntax: $("h1") (More...)

Why #id selector is used in JQuery ?

  
#id selector in JQuery is used to select #id from html document and apply some jquery on it.
e.g. Syntax: $("#idname") (More...)

Why .Class selector is used in JQuery?

  
.Class selector in JQuery is used to select .Class from html document and apply some jquery on it.
e.g. Syntax: $(".Classname") (More...)

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