每个流星过滤器 [英] Meteor filter for each
问题描述
我对过滤器和每个都有问题.我想创建一个过滤器,它将根据该过滤器更改数据.
i have a problem with filter and each. i want create a filter, that will change data according to that filter.
<select id="filter">
<option value="all">all</option>
<option value="one">one</option>
<option value="two">two</option>
</select>
{{#each datas}}
<span class="badge">{{Name}}</span>
{{/each}}
Template.mytemp.created = function(){
Session.set("activefilter", "all");
};
Template.mytemp.datas = function(){
var ac = Session.get("activefilter");
var result = new Array();
if(ac != undefined){
var data = RawData.find({filter:ac}).fetch();
for(var ii = 0; ii < data.length;ii++){
var nData = NextData.findOne({_id : data[ii].Next_ID});
result[ii] = {
Name : nData.Name
};
}
return result;
}
};
我创建了一个这样的事件处理程序:
i create an event handler like this :
Template.mytemp.events({
'change #filter':function(){
Session.set("activefilter",$('#filter').val());
}
});
每次我更换过滤器时,什么都没有发生,每个过滤器的数据都没有改变.请帮助我如何在过滤器更改时更新数据?
everytime i change the filter, nothing happend, datas on each not changed. please help me how to update datas when filter change?
推荐答案
当您手动迭代游标(使用 each
等)时,您将不得不倒回游标以重置它.取自文档 http://docs.meteor.com/#rewind
When you manually iterate over a cursor (with each
etc) you will have to rewind your cursor to reset it. Taken from the docs http://docs.meteor.com/#rewind
forEach
、map
或 fetch
方法只能在游标上调用一次.要多次访问游标中的数据,请使用 rewind
重置游标.
The
forEach
,map
, orfetch
methods can only be called once on a cursor. To access the data in a cursor more than once, userewind
to reset the cursor.
因此,您可以执行以下操作:
Therefore you can do something like this:
Template.mytemp.datas = function(){
var ac = Session.get("activefilter");
var result = new Array();
if(ac != undefined){
var cursor = RawData.find({filter:ac});
var data = cursor.fetch();
for(var ii = 0; ii < data.length;ii++){
var nData = NextData.findOne({_id : data[ii].Next_ID});
result[ii] = {
Name : nData.Name
};
}
cursor.rewind(); //we rewind our cursor here so that it can be iterated again from the beginning when needed
return result;
}
};
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