useWithBlock explanation

[Redsquare]

I have seen a few blog posts from Todd refer to the speed of templates especially when you set the useWithBlock to false. However without explanation this is set to true by default. Can you show me examples of when I do and do not need this. The docs do not even mention this setting which seems an odd omission due to the speed hype built via the blog posts.

Thanks

 

[Atanas Korchev]

Hello,

 I created a jsFiddle demo which shows the difference in the generated code:

 
By default a with(data) block is created which allows the developer to use only the field name in the template expressions:   "#= foo# instead of "#= data.foo#". The with block removes the hassle to type in "data." every time but would cause a performance decrease if the template is used a lot (a few hundred times).

Regards,
Atanas Korchev
the Telerik team

[Redsquare]

Makes sense. Thanks for the quick response.

[Joel]

Great question and equally good response.

[David]

Is there a way to set the template to disable useWithBlock outside of javascript?

I would like to do something like 
<script type="text/x-kendo-template" id="sampleTemplate" data-use-with-block="false">
 #: data.someValue #
</script>

or perhaps with 1 line of javascript make it so templates default to useWithBlock  set to false instead of true, instead of being forced to write javascript to do:

var tmp = kendo.template($("#sampleTemplate").html(), { useWithBlock: false});

[Atanas Korchev]

Hello David,

 There is an undocumented way to globally set the useWithBlock setting. However this may break some widgets. Still you can try it to see if it would work in your case. Here is a demo showing how to do that: http://jsbin.com/evicef/1/edit

Regards,
Atanas Korchev
the Telerik team