For a webbased application:- what should be code in expert veiw, for retrieving a single column name "username" from a server and checking whether exported "username" from datatable doesn't exist in server. suppose i have saved in excelsheet a username="gayatri" , which is exported, then checked for whether this username "gayatri" exist in server database or not ? if exist then allow to enter new username, which should be again checked for in loop , or else come out of loop and enter a distinct "username". plz let me have this answer in my id gayatrisahooin@hotmail.com

2196

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How can javascript make a web site easier to use? That is, are there certain javascript techniques that make it easier for people to use a web site?

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783

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1012

List out the components which can be used in AngularJS modules?

801

Why are callback functions used?

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887

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821

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776