evaluate function 1

[Naug]

Is there an evaluate function that would allow to xsl transforming e.g. 8*4 into 32?

 

[JontyMC]

XPath allows you to do calculation:

http://www.w3schools.com/xpath/default.asp

For instance:

<xsl:value-of select="8 * 4"/>

Would give you 32.

 

[Naug]

What if I need an atribute and not text tag? I better give example I suppose. I have a node

<float>47*4</float>

what I want in output is

<float value="188">188</float>

 

[JontyMC]

<float value="{7 * 4}"><xsl:value-of select="7 * 4"/></float>

 

[Naug]

value="{7 * 4}"

well how do I do that? I am trying value="{normalize-space(text())}"

but as result I simply get value="47*4" rather then the evaluation of the expression

 

[JontyMC]

Ah, OK. I see what you mean now.

As far as I know, there's no XPath function that will evaluate an expression, but I'm looking into it.

Here's a way you could do it:

<float value="{substring-before(float, '*') * substring-after(float, '*')}"><xsl:value-of select="substring-before(float, '*') * substring-after(float, '*')"/></float>

 

[Naug]

Works. Xept I swaped "form" for "text()" in the expressions but thats prolly cause tag-name in result isnt float (I left it as float to simplify the example)

 

[Naug]

Any idea how do I do if Im not sure what action "*/-+" will be required if any at all? Only thing I can figure is to myself make some sort of "math" node which will have relevant attribute

 

[JontyMC]

Could there be a combination of these, eg:

<float>47*8+3</float>

or is there always only 1 operator?

 

[Naug]

Could be anything and brackets and all... Or no operator at all which also needs separate case. Do you think parameters can be used? I never used em.

 

[JontyMC]

You could create a template that will parse the string and calculate the expression using different cases for *, +, /, - and ()'s etc but it would be a lot easier to do this in ASP or something. Are you creating the XML or processing from an outside source?

 

[Naug]

Ya I actually rewrote this to do the calc in database