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Bsaidus

Member

From: Algeria

Registered: 2018-12-16

Posts: 50

SynMustache and logical conditions.

Hello.
I wonder if there is a possibility in SynMustache to do some controls based on condition to display the wanted value.
Ex:
  I have to render an html page that containe a <Select> tag with 3 <Option>, but I want to make one <option selected > for a given one depending on value in .json.
is it possible to do this on SynMustache.
The Mustache engine comming from Freepascal trunk is buggy

EX: from the fcl-mustache.

// json 
{
  "host":{
    "name"     : "uc1.uccenos.net",
    "ip"       : "123.33.32.1",
    "mask"     : "222.222.222.0",
    "gateway"  : "123.33.23.3" 
  }
}

//template 
// depending on the mask value from json & make the adequate <Option> selected
<br/>
<ul>
  <li>hostnam : {{host.name}}</li>
  <li>ip      : {{host.ip}}</li>
  <li>mask    : {{host.mask}}</li>
  <li>gateway : {{host.gateway}}</li>
 <select name="themask">
    <option value="111.222.333.111" {{[IF(mask='111.222.333.111', 'selected','')]}}> 111.222.333.111 </option>
    <option value="222.222.222.0"   {{[IF(mask='222.222.222.0', 'selected','')]}}> 222.222.222.0   </option>  
    <option value="333.222.333.111" {{[IF(mask='333.222.333.111', 'selected','')]}}> 333.222.333.111 </option>
</select>

Thanks  you.

igors233

Member

Registered: 2012-09-10

Posts: 241

Re: SynMustache and logical conditions.

Use:
<option value="111.222.333.111" {{#if host.mask="111.222.333.111"}} selected {{/if}}> 111.222.333.111 </option>
<option value="222.222.222.0" {{#if host.mask="222.222.222.0"}} selected {{/if}}>222.222.222.0</option>

Bsaidus

Member

From: Algeria

Registered: 2018-12-16

Posts: 50

Re: SynMustache and logical conditions.

Use:
<option value="111.222.333.111" {{#if host.mask="111.222.333.111"}} selected {{/if}}> 111.222.333.111 </option>
<option value="222.222.222.0" {{#if host.mask="222.222.222.0"}} selected {{/if}}>222.222.222.0</option>

Thanks igor for help, but it do not work for me.

// lazarus code 
procedure TForm1.Button2Click(Sender: TObject);
var
  Template,
  Context,
  Result: RawUTF8;
  mustache: TSynMustache;
begin

  Template := StringToUTF8(mmTemp.Text);            // mmTemp = memo for template
  Context := StringToUTF8(mmJson.Text);               // mmJson = memo for json
  mmRes.Append( UTF8ToString(Context) );            // mmRes = memo for resulting rendring

  mustache := TSynMustache.Parse(Template);

  mmRes.Append('-----------------------------------------------------------');

  mmRes.Append(mustache.RenderJSON(Context));

end;  

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,649

Website

Re: SynMustache and logical conditions.

Try to use the debugger to find out why it did not work.
For instance, put a breakpoint into the "if" helper, i.e. TSynMustache.If_().

You will learn a lot about how it works.

Bsaidus

Member

From: Algeria

Registered: 2018-12-16

Posts: 50

Re: SynMustache and logical conditions.

Try to use the debugger to find out why it did not work.
For instance, put a breakpoint into the "if" helper, i.e. TSynMustache.If_().

You will learn a lot about how it works.

I did, but it do not even enter there.

tbo

Member

Registered: 2015-04-20

Posts: 353

Re: SynMustache and logical conditions.

Thanks igor for help, but it do not work for me.

You do not register the default helper, so "IF" is not available to you. You have to write it like this:

mustache.RenderJSON(Context, Nil, TSynMustache.HelpersGetStandardList)

All in all, I would not solve this during generation, but calculate it outside and then pass it. How to use Mustache is described in this article with source code.

With best regards
Thomas

Bsaidus

Member

From: Algeria

Registered: 2018-12-16

Posts: 50

Re: SynMustache and logical conditions.

Thanks igor for help, but it do not work for me.

You do not register the default helper, so "IF" is not available to you. You have to write it like this:

mustache.RenderJSON(Context, Nil, TSynMustache.HelpersGetStandardList)

All in all, I would not solve this during generation, but calculate it outside and then pass it. How to use Mustache is described in this article with source code.

With best regards
Thomas

Thank you Thomas, I'll read.

EloisePalmer

Member

From: mexico

Registered: 2023-05-13

Posts: 1

Website

Re: SynMustache and logical conditions.

I was searching and came across the line you shared here. Thank you so much, it really helped me a lot

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Canva Pro Modilimitado

ShelleyBarton

Member

From: Mexico

Registered: 2023-06-14

Posts: 1

Website

Re: SynMustache and logical conditions.

Thanks Thomas, I have read and applied them, it really works well. descargar tonos para celular

Last edited by ShelleyBarton (2024-04-22 12:59:55)