Jquery – Conditionally selecting a version of jquery depending on environment

intellisensejqueryvisual-studio-2008

I have 2 references to jQuery in my master page which is currently configured for production release:

<script type="text/javascript"
 src="http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js">
</script>
<%--<script type="text/javascript" src="../Scripts/jquery-vsdoc.js"></script>--%>

When I'm developing, I uncomment the vsdoc version so that I get intellisense in VS2008 and then switch it back before deploying it – except for the times that I forget. Is there a way to have intellisense in dev and use the Google CDN in prod that doesn't require an edit to deploy? i.e. a conditional inclusion dependent on environment…

EDIT:
If I specify this file: http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js as my JavaScript file then VS2008 (with patch) will look for this file: http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min-vsdoc.js (with -vsdoc just before the .js) to use for intellisense. The problem is that Google does not provide the second named file in that location.

Another acceptable answer would be the answer to this question: "How do I get Google to put a jquery.min-vsdoc.js file at http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/ ?"

Best Answer

The suggested workaround (since Google doesn't host the documentation) is to reference the documentation script in a way that will never be included, for example

<% if (false) { %>
    <script type="text/javascript" src="../Scripts/jquery-vsdoc.js"></script>
<% } %>

<asp:PlaceHolder runat="server" Visible="False">
    <script type="text/javascript" src="../Scripts/jquery-vsdoc.js"></script>
</asp:PlaceHolder>

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In JavaScript, everything is 'truthy' or 'falsy', and for numbers 0 means false, everything else true. So you could write:

if ($(selector).length)

You don't need that >0 part.

Javascript – Add table row in jQuery

The approach you suggest is not guaranteed to give you the result you're looking for - what if you had a tbody for example:

<table id="myTable">
  <tbody>
    <tr>...</tr>
    <tr>...</tr>
  </tbody>
</table>

You would end up with the following:

<table id="myTable">
  <tbody>
    <tr>...</tr>
    <tr>...</tr>
  </tbody>
  <tr>...</tr>
</table>

I would therefore recommend this approach instead:

$('#myTable tr:last').after('<tr>...</tr><tr>...</tr>');

You can include anything within the after() method as long as it's valid HTML, including multiple rows as per the example above.

Update: Revisiting this answer following recent activity with this question. eyelidlessness makes a good comment that there will always be a tbody in the DOM; this is true, but only if there is at least one row. If you have no rows, there will be no tbody unless you have specified one yourself.

DaRKoN_ suggests appending to the tbody rather than adding content after the last tr. This gets around the issue of having no rows, but still isn't bulletproof as you could theoretically have multiple tbody elements and the row would get added to each of them.

Weighing everything up, I'm not sure there is a single one-line solution that accounts for every single possible scenario. You will need to make sure the jQuery code tallies with your markup.

I think the safest solution is probably to ensure your table always includes at least one tbody in your markup, even if it has no rows. On this basis, you can use the following which will work however many rows you have (and also account for multiple tbody elements):

$('#myTable > tbody:last-child').append('<tr>...</tr><tr>...</tr>');

Best Answer

Related Solutions

Javascript – n “exists” function for jQuery

Javascript – Add table row in jQuery

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