Conditional content in Mandrill template

问题

I am handing over dictionary keys (key value pair) to a service which in turn utilizes the api to send the email via Mandrill.

Now, if my key is blank then i dont want it to be included in the email. Like in the following scenario, i only want the link text to display if my key has some value.

<a href="|UPDATE_PROFILE|" target="_blank" >change subscription preferences</a>

How can i write it some thing like or even is this possible?

if *|UPDATE_PROFILE|* IS NOT EMPTY
BEGIN
<a href="*|UPDATE_PROFILE|*" target="_blank">change subscription preferences</a> 
END

回答1:

I have found the answer here: http://help.mandrill.com/entries/28427818-Can-I-use-dynamic-or-conditional-merge-tags-

Here is the info from the page:

Conditional merge tags support traditional IF, ELSE, and ELSEIF logic as well as IFNOT negative conditions.

Use IF conditions to display content only when the condition evaluates as true.

*|IF:MERGE|*
content to display if a value for MERGE is provided
*|END:IF|*


*|IF:MERGE=x|*
    content to display if the value for MERGE is x
*|END:IF|*

When using a condition like |IF:MERGE=x|, and no value for MERGE is provided, the condition will evaluate as false.

Use IF and ELSE conditions to display content when a condition is true, but alternate content when the condition evaluates as false.

*|IF:MERGE|*
    content to display
*|ELSE:|*
    alternative content
*|END:IF|*

The ELSEIF condition

Use ELSEIF to display one of several possible options. Only the content following the first condition evaluated as true will be displayed—other conditions will be skipped.

*|IF:MERGE=x|*
    <p>content to display if the value for MERGE is x</p>
*|ELSEIF:MERGE=y|*
    <p>content to display if the value for MERGE is not x, but is y</p>
*|ELSEIF:MERGE=z|*
    <p>content to display if the value for MERGE is not x or y, but is z</p>
*|ELSE:|*
    <p>alternate content to display if the value for MERGE is not x, y, or z</p>
*|END:IF|*

Nested conditions

*|IF:MERGE1=x|*
    *|IF:MERGE2=y|*
          <div mc:edit="main"> 
                <p>content to display if both conditions are true</p>
           </div>
    *|END:IF|*
*|END:IF|*

Negative conditions

*|IF:MERGE!=x|*
    content to display if the value for MERGE is not x
*|ELSE:|*
    content to display if the value for MERGE is x
*|END:IF|*


*|IFNOT:MERGE|*
    content to display if MERGE is not provided
*|ELSE:|*
    content to display if MERGE is provided
*|END:IF|*

Use in mycase

*|IF:UPDATE_PROFILE|*
                    <p>IMPORTANT NOTE: *|LAYOUTYEAR|*  
                        available for review at: http://www.somesite.org/SomePage.</p>
                *|ELSE:|*
                    <p>
                        <a href="http://www.somesite.org/SomePage" target="_blank">Click here</a>
                        to view the detailed specs.
                    </p>
                *|END:IF|*

回答2:

Mandrill supports conditional tags

Basic IF condition

*|IF:UPDATE_PROFILE|*
    content to display if a value for UPDATE_PROFILE is provided
*|END:IF|*

*|IF:UPDATE_PROFILE=x|*
    content to display if the value for UPDATE_PROFILE is x
*|END:IF|*

Basic IF-ELSE condition

*|IF:UPDATE_PROFILE|*
    content to display
*|ELSE:|*
    alternative content
*|END:IF|*

ELSEIF condition

*|IF:UPDATE_PROFILE=x|*
    <p>content to display if the value for UPDATE_PROFILE is x</p>
*|ELSEIF:UPDATE_PROFILE=y|*
    <p>content to display if the value for UPDATE_PROFILE is not x, but is y</p>
*|ELSEIF:UPDATE_PROFILE=z|*
    <p>content to display if the value for UPDATE_PROFILE is not x or y, but is z</p>
*|ELSE:|*
    <p>alternate content to display</p>
*|END:IF|*

Negative conditions

*|IF:UPDATE_PROFILE!=x|*
    content to display if the value for UPDATE_PROFILE is not x
*|ELSE:|*
    content to display if the value for UPDATE_PROFILE is x
*|END:IF|*

*|IFNOT:UPDATE_PROFILE|*
    content to display if UPDATE_PROFILE is not provided
*|ELSE:|*
    content to display if UPDATE_PROFILE is provided
*|END:IF|*

来源：https://stackoverflow.com/questions/25088996/conditional-content-in-mandrill-template

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