I am trying to figure out how to pass a parameter into a sub-template that is in an each block and use the parameter in the sub-template as well as sub-template helper. Here is what I tried so far:
template:
<template name="parent"> {{#each nodes }} {{> child myParam}} {{/each}} </template> <template name="child"> {{ paramName }} </template>
js:
Template.parent.nodes = function() { //return a list }; Template.parent.myParam = function() { return {"paramName" : "paramValue"}; }; Template.child.someOtherHelper = function() { //How do I get access to the "paramName" parameter? }
So far, it hasn't been working, and it seems somehow mess up my input node list also.
Thanks for help.
When you use {{> child myParam}}, it's calling the child template and associates myParam as current template data context, meaning that in the template you can reference {{paramName}}.
In someOtherHelper you could use this.paramName to retrieve "paramValue". However, when you're using {{#each nodes}}{{> child}}{{/each}}, it means that you pass the content of the current list item (fetched from a LocalCursor or directly an array item) as the template data of child, and you can reference the list item properties using {{field}} in html or this.field in js.
What's happening here is when you call {{> child myParam}}, the myParam helper content OVERWRITES the current node item as template data, that's why it's messing your node list.
A quick (dirty) trick would be to simply extend the myParam helper so that it also contains the template data from the {{#each}} block.
Template.parent.helpers({ nodes:function(){ // simulate typical collection cursor fetch result return [{_id:"A"},{_id:"B"},{_id:"C"}]; }, myParam:function(){ // here, this equals the current node item // so we _.extend our param with it return _.extend({paramName:"paramValue"},this); } }); Template.child.helpers({ someOtherHelper:function(){ return "_id : "+this._id+" ; paramName : "+this.paramName; } }); <template name="parent"> {{#each nodes}} {{> child myParam}} {{/each}} </template> <template name="child"> {{! this is going to output the same stuff}} <div>_id : {{_id}} ; paramName : {{paramName}}</div> <div>{{someOtherHelper}}</div> </template>
Depending on what you're precisely trying to achieve, there might be a better approach but this one gets the job done at least.
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