How can data be retrieved from a database or XML file in ASP.NET and then added to a JavaScript array?
How can data be retrieved from a database or XML file in ASP.NET and then added to a JavaScript array?
Both AJAX and Literals are effective methods for 'retrieving data'.
In my experience, I prefer using literals when passing 'configuration' in a generated page, and utilizing AJAX requests (returning JSON) to fetch data. However, with small data sets, embedding literals directly into the page can be more efficient. When including JS files, it's recommended to use AJAX calls.
For example, an object literal could look like this:
var myConfig =
{
AnArray: <%= mySerializedArrayFromTheServer%>,
ASerializedObject : <%=mySerializedObjectFromTheServer%>,
DataUri : 'http://someweburi/ThatReturns.json/',
SomeHardCodedValue : 'This is a message',
IdsUsedInPage: {
GridContainer: 'uxGridContainerId',
FormContainer: 'uxFormContainerId'
}
};
It's worth noting that you can also serialize to XML and use a parser in your JavaScript, although this approach is less common and may impact performance.
Are you working with JavaScript in the browser? If so, a common approach is to utilize JSON, whether it's included as part of the page or sent back in response to an AJAX request (excluding the X part, of course).
In my own experience, I've found Json.NET to be quite user-friendly and easy to work with.
Assuming you're already familiar with retrieving data from a database, I recommend dividing your tasks - first, focus on extracting the data from the database and testing that code. Then, separately concentrate on transferring this data to the browser using JSON or another method. You can start by creating hard-coded data in the same format as what will eventually come from the database. Once you have both components functioning independently, you can combine them together seamlessly.
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