How can one make spacebars react when the set key does not exist in the template?
Example:
//JavaScript
Template.foo.helpers({
//"zaz" : "hello",
"bar" : 1
});
...
<!-- Template -->
<template name="foo">
{{bar}}
{{#ifExist zaz}}
{{zaz}}
{{else}}
"fill-me"
{{/ifExist}}
</template>
You can just check if your helper is defined by using a simple if statement followed by the helper or value you want to check:
<template name="foo">
{{bar}}
{{#if zaz}}
{{zaz}}
{{else}}
fill-me
{{/if}}
</template>
Related
I'd like to access a parameter template while I'm on a {{#each}} already. Something like:
<template name="overview">
{{> userList users=users level=0}}
</template>
<template name="userList">
{{#each users}}
<div class="level{{../something}}">
<!-- not working, how can i access {{something}} here ? -->
{{>userList users=users level=subLevel}}
{{name}}
{{/each}}
</template>
Template.userList.helpers({
subLevel: function() {
return this + 1;
}
});
but it's not working, do you have any idea ?
Technically, I'm calling recursively a template, and I'd like to know at what level my template is.
I'm not sure what you're trying to do but this doesn't look right. A template calling itself leads to an infinite loop. For example, create a new meteor project and try to call {{> hello}} inside "hello" template. It doesn't work.
<head>
<title>test</title>
</head>
<body>
<h1>Welcome to Meteor!</h1>
{{> hello}}
</body>
<template name="hello">
<button>Click Me</button>
<p>You've pressed the button {{counter}} times.</p>
{{> hello}}
</template>
There must be another way to do what you're trying to do...
<template name="overview">
{{> userList users=users level=0}}
</template>
<template name="userList">
{{#each users}}
<div class=level>
{{>userList users=users level=subLevel}}
{{name}}
{{/each}}
</template>
Because you have enclosed level variable in double quotes that will not be evaluated.
Ok, I finally found that the best way to achieve that was to add a level key in my array of users instead of passing it with a parameter. Spacebars seems to no be able to achieve what I wanted initially.
Say I have a Meteor application which displays widgets. A widget can have one of several forms:
<template name="textWidget">
<h1>{{myTitle}}</h1>
<p>{{myTextContent}}</p>
</template>
<template name="imgWidget">
<h1>{{myTitle}}</h1>
<img src="{{myImagePath}}" />
</template>
<template name="listWidget">
<h1>{{myTitle}}</h1>
<ul>
{{#each items}}
{{> listWidgetItem}}
{{/each}}
</ul>
</template>
Is there a good pattern for rendering a specific template given a record type?
Naively, I can do something like:
<template name="masterTemplate">
{{#each widgets}}
{{#if widgetType "text"}}
{{> textWidget}}
{{else}}
{{#if widgetType "img"}}
{{> imgWidget}}
{{else}}
{{if ... }} ... {{/if}}
{{/if}}
{{#/if}}
{{/each}}
</template>
With a helper like:
Template.masterTemplate.widgetType = function(cmp) {
return cmp === this.data.type;
};
This seems like a very clunky and unflexible way to operate though. Am I missing an obvious library or design pattern for this use case?
You can try something like this:
UI.registerHelper('widget', function () {
var templateName = this.data.type + 'Widget';
return Template[templateName].extend({ data: this });
});
and you can use it as follows:
{{> widget context}}
or
{{#with context}}
{{> widget}}
{{/with}}
Using data of the form:
users =
_id: 'foo'
books: [
{name: 'book1'}
{name: 'book2'}
]
<template name="user">
{{#each get_users}}
{{> shelf}}
{{/each}}
</template>
<template name="shelf">
{{#each books}}
{{> book}}
{{/each}}
</template>
<template name="book">
<div contenteditable="true" data-id="{{_id}}">{{name}}</div>
</template>
I want _id in the book template to refer to the _id of the user, but _id is not in scope inside the book template. I'd like to be able to do something like {{> book _id}}, but that doesn't work, I think because book can only have one argument, and that is each {name: 'book1'} doc.
Use a custom block helper. It would be nicer if Meteor allowed multiple arguments for custom block helpers (this is supported in Handlebars). Since it doesn't (see the the wiki), this is the best I came up with, passing a modified this to the subtemplate book.
<template name="shelf">
{{#my_iterator}}
{{> book}}
{{/each}}
</template>
Templates.shelf.my_iterator = (options) ->
html = "
for book in this.books
this.name = book.name
html += options.fn this
html
Say we have a parent template and a child template:
<template name="parent">
{{> child }}
</template>
<template name="child">
{{#if show}}
//Do something
{{/if}}
</template>
If we assign 'show' to the parent template:
if (Meteor.isClient){
Template.parent.show = function(){
return Session.get('isShowing');
}
}
Is there any way for the child template to have access to it?
Edit
You could make a universal handlebars helper so you could use Sessions values anywhere in your html:
Client js
Handlebars.registerHelper('session', function(key) {
return Session.get(key);
});
Client HTML
<template name="child">
{{#if session "show"}}
//Do something
{{/if}}
</template>
Similarly, you could also use {{session "show"}} / {{#if session "show"}} in your parent template and not have to use the Template.parent.show helper anymore.
Regarding the use of ../ notation. There are certain scenarios it may not work: https://github.com/meteor/meteor/issues/563. Basically it works within {{#block helpers}} but not with templates, but it would work in a block helper if it contains a subtemplate.
<template name="child">
{{#if ../show}}
Do something
{{/if}}
</template>
You can also register a common helper :
Template.registerHelper('isTrue', function(boolean) {
return boolean == "true";
});
And call it just like that in your html:
<input type="checkbox" checked="{{isTrue attr}}"/>
I have three simple Templates in Meteor, and a Collection on the server with any combination of their names. I want to be able to render these templates dynamically based on which of their names are in the Collection.
Currently I am trying to accomplish this by using the client to subscribe to the Collection, and access the names through a template function. Unfortunately, if I try to run ">" on the names, Meteor attempts to render the variable name instead of the Template pointed to by its value.
So instead of rendering the html in template1, template2, and template3, the output is merely their names on the page: "template1 template2 template3".
Here is the code I've been using, I hope there's a way to solve my issue without having to run Meteor.render manually.
Server js:
TemplatesToRender = new Meteor.Collection("templatesToRender");
TemplatesToRender.insert({templateName: "template3"});
TemplatesToRender.insert({templateName: "template2"});
Client html:
<body>
{{#each templatesToRender}}
{{> templateName}} // meteor trying to render a template
// called "templateName" instead of the
// variable inside templateName.
{{/each}}
</body>
<template name="template1">
<span>Template 1</span>
</template>
<template name="template2">
<span>Template 2</span>
</template>
<template name="template3">
<span>Template 3</span>
</template>
You can make a render helper:
Handlebars.registerHelper('render', function(name, options) {
if (Template[name])
return new Handlebars.SafeString(Template[name]());
});
And use it with
{{render templateName}}
You might want to try this
in your html
<body>
{{> templateToRender}}
</body>
<template name="templateToRender">
{{! use below to detect which template to render}}
{{#if templateName "template1"}}
{{> template1}}
{{/if}}
{{#if templateName "template2"}}
{{> template3}}
{{/if}}
{{#if templateName "template3"}}
{{> template3}}
{{/if}}
</template
<template name="template1">
<p>this is template1</p>
</template>
<template name="template2">
<p>this is template2</p>
</template>
<template name="template3">
<p>this is template3</p>
</template>
in your script
Template.templateToRender.templateName = (which) ->
# if user have a field like templateName you can do things like
tmplName = Meteor.user().templateName
# Session.equals will cause a template render if condition is true.
Session.equals which, tmplName
Meteor 1.0 just came out today, and I just want to update this for 2014 :)
https://docs.meteor.com/#/full/template_dynamic
{{> Template.dynamic template=template [data=data] }}
Sample Usage:
{{#each kitten}}
{{> Template.dynamic template=kitten_type data=this }}
{{/each}}