Here’s all the details from the E4X spec:
Expressions may be used to compute parts of an XML initialiser. Expressions are
delimited by curly braces and may appear inside tags or element content. Inside
a tag, expressions may be used to compute a tag name, attribute name, or
attribute value. Inside an element, expressions may be used to compute element
content. For example,
for (var i = 0; i < 10; i++)
e[i] = <employee id={i}> // compute id value
<name>{names[i].toUpperCase()}</name> // compute name value
<age>{ages[i]}</age> // compute age value
</employee>;
Each expression is evaluated and replaced by its value prior to parsing the
literal XML value. For example the following expression,
var tagname = "name";
var attributename = "id";
var attributevalue = 5;
var content = "Fred";
var x = <{tagname} {attributename}={attributevalue}>{content}</{tagname}>;
would assign the following XML value to the variable x.
<name id="5">Fred</name>
I’m pretty sure that the only place a curly brace literal is legal is in a
CDATA block.
On Jan 4, 2016, at 7:27 PM, Alex Harui <[email protected]> wrote:
>
>
> On 1/4/16, 8:17 AM, "Harbs" <[email protected]> wrote:
>
>> For literals, yes, we’d for the most part just pass the whole thing as a
>> string to the constructor. The only exception I can think of is bracket
>> notation:
>>
>> var foo:XML = <node><subnode attr={myAttr}>foo</subnode></node>;
>> would have to become:
>> var foo:XML = new XML('<node><subnode
>> attr="‘+myAttr+’">foo</subnode></node>’);
>
> Wow, didn't know about that capability. I'll have to see what the parser
> knows about that.
>
> -Alex
>
