自定义淘汰赛验证3参数 [英] Custom Knockout Validation 3 Parameters
问题描述
我想创建一个自定义的剔除验证规则,该规则将接受当前可观察值的值,与其进行比较的值以及一个条件.
I want to create a custom knockout validation rule that would take in the current observable's value, the value to compare it to, and a conditional.
我在网上看到的所有示例都只有两个参数传递到自定义验证中.
All of the examples I've seen on the web have only two parameters passed into the custom validation.
我已经做出了一种解决方法,将具有要比较的值和条件的值传递给数组,但这有点笨拙.我的消息格式也将输出数组中的值,而不仅仅是otherVal
.
I have made a workaround to pass an array with the value to compare and the conditional, but this is a bit clunky. My message format outputs the values in the array as well instead of just the otherVal
.
例如:
/*
* Compares two values only if the specified condition is true.
* Parameters:
* array[0] - otherVal
* array[1] - conditional
*
* Returns:
* true if the condition is false.
* true if the condition is true AND val is lessThanOrEqualTo otherVal
* false otherwise
*
* Usage:
* Used to validate observables conditionally.
*
* Example:
* self.salary = ko.observable().extend({
mustLessThanOrEqualConditional: [100, isFieldEditable]})
*/
ko.validation.rules['mustLessThanOrEqualConditional'] = {
validator: function(val, array) {
if (array[1]) {
return val <= array[0];
}
return true;
},
message: 'The field must be <= {0}'
};
是否可以将三个参数传递给验证函数,例如:
Is there a way to pass three parameters into the validation function such as:
ko.validation.rules['mustLessThanOrEqualConditional'] = {
validator: function(val, otherVal, condition) {
if(condition){
return val <= otherVal;
}
return true;
},
message: 'The field must be <= {0}'
}
推荐答案
您可以使用对象代替Array
:
ko.validation.rules['mustLessThanOrEqualConditional'] = {
validator: function(val, params) {
if (params.condition) {
return val <= params.otherVal;
}
return true;
},
message: 'The field must be <= {0}'
};
model.obs.extend({ mustLessThanOrEqualConditional: {
params: { otherVal: 3, condition: 1 != 0 }
}
});
Although in your case, I would suggest using the onlyIf
functionnality instead:
ko.validation.rules['mustLessThanOrEqualConditional'] = {
validator: function(val, params) {
return val <= params.otherVal;
},
message: 'The field must be <= {0}'
};
model.obs.extend({ mustLessThanOrEqualConditional: {
onlyIf: function () { /* your test here */ },
params: { otherVal: 3 }
}
});
因为我是一个非常友好的人,所以这是我使用的规则:
As I am a very nice person, here is the rule I use:
ko.validation.rules['compareTo'] = {
message: "Compare to",
validator: function (val, params) {
if (val === null || params.value() === null)
return params.allowNull;
switch (params.way) {
case "<": return val < params.value();
case "<=": return val <= params.value();
case ">": return val > params.value();
case ">=": return val >= params.value();
default: throw new Error("params is not well defined");
}
}
}
model.obs.extend({ compareTo: {
message:"your message",
params: {
way: ">=",
value: model.otherObs,
allowNull: true
},
onlyIf: function () { /*your test*/ }
}});
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