Meteor.js Handlebars模板逻辑运算符 [英] Meteor.js Handlebars template logic operators

问题描述

从此页面，我插入到我的/client/helpers/handlebars.js文件中的这个句柄帮助器：

  Handlebars.registerHelper（'compare'，function （lvalue，operator，rvalue，options）{
 
 var操作符，结果; 
 
 if（arguments.length< 3）{
 throw new Error（ Handlerbars Helper'compare'needs 2 parameters）; 
} 
 
 if（options === undefined）{
 options = rvalue; 
 rvalue = operator; 
 operator ====; 
} 
 
 operators = {
'=='：function（l，r）{return l == r;} ，
'==='：function（l，r）{return l === r;}，
'！='：function（l，r）{return l！= r;} ，
'！=='：function（l，r）{return l！== r;}，
'<'：function（l，r）{return l< r;} ，
'>'：function（l，r）{return l> r;}，
 '< ='：function（l，r）{return l <= r; }，
'> ='：function（l，r）{return 1> = r; }，
'typeof'：function（l，r）{return typeof l == r; } 
}; 
 
 if（！operators [operator]）{
 throw new Error（Handlerbars Helper'compare'不知道操作符+操作符）; 
} 
 
 result = operators [operator]（lvalue，rvalue）; 
 
 if（result）{
 return options.fn（this）; 
} else {
 return options.inverse（this）; 
} 
 
}）; 
  

以及模板：

<$ p $ {{＃compareTestTest}}
===的默认比较
{{/比较}}
$ b

我也试过这个：



  {{＃compareTest==测试}} 
  

但这没有帮助。


解决方案

试试

  {{＃compareTest ===}} 
  




From this page, I inserted to my /client/helpers/handlebars.js file this handlebars helper:

Handlebars.registerHelper('compare', function (lvalue, operator, rvalue, options) {

var operators, result;

if (arguments.length < 3) {
    throw new Error("Handlerbars Helper 'compare' needs 2 parameters");
}

if (options === undefined) {
    options = rvalue;
    rvalue = operator;
    operator = "===";
}

operators = {
    '==': function (l, r) { return l == r; },
    '===': function (l, r) { return l === r; },
    '!=': function (l, r) { return l != r; },
    '!==': function (l, r) { return l !== r; },
    '<': function (l, r) { return l < r; },
    '>': function (l, r) { return l > r; },
    '<=': function (l, r) { return l <= r; },
    '>=': function (l, r) { return l >= r; },
    'typeof': function (l, r) { return typeof l == r; }
};

if (!operators[operator]) {
    throw new Error("Handlerbars Helper 'compare' doesn't know the operator " + operator);
}

result = operators[operator](lvalue, rvalue);

if (result) {
    return options.fn(this);
} else {
    return options.inverse(this);
}

});

And to the template:

{{#compare "Test" "Test"}}
Default comparison of "==="
{{/compare}}

And in console I always see: Exception from Deps recompute: Error: Handlerbars Helper 'compare' needs 2 parameters

I tried this as well:

{{#compare "Test" "==" "Test"}}

But this did not help.

解决方案

Try

{{#compare "Test" "Test" operator="=="}}

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