如何获取模板中Meteor.call函数的结果 [英] How to get the result of a Meteor.call function in a template
问题描述
我试图做一个分页函数用于Meteor客户端。
因此我需要知道服务器上的记录数。
在服务器上(在server / bootstrap.coffee中)我有这个代码:
Meteor.methods
ContactsCount: - >
Contacts.find()。count()
console.log(Totalrecords:+ Contacts.find()。count())
服务器部分被调用(在控制台上显示正确的数字 - 40)
我有:
$。extend Template.pager,
GetRecordCount: - >
Meteor.call(ContactsCount,(error,result) - >
console.log('r',result)
从浏览器控制台Template.pager.RecordCount()返回
undefined
r 30
我理解'undefined'是Template.pager.RecordCount()的返回
>但是如何获得结果的值在我的寻呼机模板?
我正在搜索java回调几个小时, ,我无法让它工作。
请帮助。
这是更新。
我查看了无效的文档
但是这个例子没有帮助我在客户端设置了一个参数在函数调用,所以没有回调使用。回调是我的问题。
我这样解决:
调用(ContactsCount,myFunc)
###这是当服务器
函数'Meteor.call(ContactsCount,myFunc)'被调用时的回调函数
当返回服务器调用的结果时,将执行此命令###
myFunc =(error,result) - >
if!error
pages = result / Session.get(page_size)
Session.settotal_pages,Number(pages.toFixed(0)+ 1)
Session .settotal_records,result
如果错误
console.log(错误)
这样工作。我仍然想知道这是否是最好的解决方案。
我有很多Session.set()调用,也许有太多的触发。
##此函数将设置css类
以启用或禁用寻呼机按钮
在pager模板中的myapp.html ###
SetPagerButtons = - >
Meteor.call(ContactsCount,myFunc)
如果Session.get(current_page)<= 1
Session.setnextEnabled,
Session。设置lastEnabled,
Session.setfirstEnabled,disabled
Session.setpreviousEnabled,disabled
Session.setlast_record,false
else if Session.get(last_record)或Session.equals(current_page,Session.get(total_pages))
Session.setnextEnabled,disabled
Session.set lastEnabled,disabled
Session.setfirstEnabled,
Session.setpreviousEnabled,
else
Session.setnextEnabled
Session.setlastEnabled,
Session.setfirstEnabled,
Session.setpreviousEnabled,
Session.setlast_record ,false
您需要使模板无效,通过使用模板帮助器中的会话,使用集合或使用无效上下文来完成:
http://docs.meteor。 com /#invalidate
更新:
说实话,你所拥有的是正确的,你说,我只是最小化会话的数量。基本上有三种方法使模板无效:使用context.invalidate()强制失效,更新客户端集合或更新会话。
所以,你可以使用代码(我不使用咖啡脚本的Sudo乱码)
//客户端服务器调用
total_records = 0
page_numbers_context = null
Meteor.call(ContactsCount,contactsCountCallback)
contactsCountCallback =(error,result) - >
if!error
total_records = result
如果page_numbers_context
page_numbers_context.invalidate();
如果错误
console.log(错误)
//添加模板处理程序
Handlebars.registerHelper('page_numbers',pageNumberCallback );
pageNumberCallback =(options) - >
page_numbers
var context = Meteor.deps.Context.current;
if context&&& !page_numbers_context
page_numbers_context = context
context.on_invalidate - >
page_numbers_context = null
pages = total_records / page_size
total_pages = Number(pages.toFixed(0)+ 1)
//使用ifs创建的HTML代码
//在模板中:
{{#page_numbers}} {{/ page_numbers}}
I'm trying to make a pagination function for use in a Meteor client. Therefore I need to know the record count on the server.
On the server (in server/bootstrap.coffee) I have this code:
Meteor.methods
ContactsCount: ->
Contacts.find().count()
console.log("Totalrecords: " + Contacts.find().count())
The server part is called (it displays the correct number on the console - 40)
On the client I have:
$.extend Template.pager,
GetRecordCount: ->
Meteor.call("ContactsCount", (error,result) ->
console.log('r', result)
From the browser console Template.pager.RecordCount() returns
undefined
r 30
I understand the 'undefined' is the return from Template.pager.RecordCount() and it is returned first.
When the result comes available it is displayed to the console.
But how do I get the value of result in my pager template?
I'm searching java callbacks for a few hours now, but whatever I try, I cant get it to work.
Please help.
Here is an update.
I looked at the documentation for invalidate. But the example doesn't help me much. The temperature is set in the client with a paramater in the function call. So there is no callback used. The callback was my problem.
I solved it like this:
Meteor.call("ContactsCount", myFunc)
### This is the call back function when the server
function 'Meteor.call("ContactsCount", myFunc)' is called
When the result from the server call is returned, this will be executed ###
myFunc = (error, result) ->
if !error
pages = result / Session.get("page_size")
Session.set "total_pages", Number(pages.toFixed(0) + 1)
Session.set "total_records", result
if error
console.log(error)
This works. I'm still wondering if this is the best solution. I have a lot of Session.set() calls and maybe there is too much triggering going on.
### This function will set the css classes
for enabling or disabling the pager buttons
in the Pager Template in myapp.html ###
SetPagerButtons = ->
Meteor.call("ContactsCount", myFunc)
if Session.get("current_page") <= 1
Session.set "nextEnabled", ""
Session.set "lastEnabled", ""
Session.set "firstEnabled", "disabled"
Session.set "previousEnabled", "disabled"
Session.set "last_record", false
else if Session.get("last_record") or Session.equals("current_page", Session.get("total_pages"))
Session.set "nextEnabled", "disabled"
Session.set "lastEnabled", "disabled"
Session.set "firstEnabled", ""
Session.set "previousEnabled", ""
else
Session.set "nextEnabled", ""
Session.set "lastEnabled", ""
Session.set "firstEnabled", ""
Session.set "previousEnabled", ""
Session.set "last_record", false
You need to invalidate the template, this can be done by using sessions in your template helper, using collections or using the invalidate context:
http://docs.meteor.com/#invalidate
Update:
To be honest what you have is correct as you say, I would just minimise the number of sessions. Basically there are three ways to invalidate a template: force an invalidation with context.invalidate(), Update a client collection or update a session.
So yeah you could use this code (Sudo messy as I don't use coffee script)
//client server call
total_records = 0
page_numbers_context = null
Meteor.call("ContactsCount", contactsCountCallback)
contactsCountCallback = (error, result) ->
if !error
total_records = result
if page_numbers_context
page_numbers_context.invalidate();
if error
console.log(error)
//Add template handler
Handlebars.registerHelper('page_numbers', pageNumberCallback);
pageNumberCallback = (options) ->
page_numbers
var context = Meteor.deps.Context.current;
if context && !page_numbers_context
page_numbers_context = context
context.on_invalidate ->
page_numbers_context = null
pages = total_records / page_size
total_pages = Number(pages.toFixed(0) + 1)
//HTML code built with ifs here
//In template:
{{#page_numbers}}{{/page_numbers}}
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