我的目标：使用KnockoutJS我有一组输入文本字段,用户可以输入他们的产品名称和typeahead.js将为每个文本框提供自动建议.可以动态添加或删除更多这些文本字段.
查看实例(JS Fiddle)：http://jsfiddle.net/justosophy/5Z9We/
问题是：Typeahead适用于初始文本字段,但仅适用于动态字段.敲除自定义绑定allBindingsAccessor()是未定义的,因此无法保存该值.
错误：
TypeError: string is not a function
HTML：
<div data-bind="foreach: products">
<div class="product">
<label>Enter Product Name:</label>
<input type="text" class="text-input product-search" data-bind="typeahead: productName,value: productName,productNameVal: productName,productIDVal: productID,valueUpdate: 'afterkeydown'" />
<a class="btn btn-danger" data-bind="click: $root.removeProduct" title="remove">remove</a>
</div>
</div>
<a class="btn btn-primary" data-bind="click: addProduct">Add another product</a>
JavaScript的：
var my = {},i;
// Create two initial entry Boxes
my.initialData = [];
for (i = 2; i !== 0; i -= 1) {
my.initialData.push({ productName: "",productID: 0 });
}
// Knockout model
my.ProductsModel = function (products) {
var self = this;
self.products = ko.observableArray(ko.utils.arrayMap(products,function (product) {
return {
productName: ko.observable(product.productName),productID: ko.observable(product.productID)
};
}));
self.addProduct = function () {
self.products.push({
productName: "",productID: 0
});
};
self.removeProduct = function (product) {
self.products.remove(product);
};
};
// List of product options
my.productsList = [
{ value: 'alpha',productID: 1 },{ value: 'apple',productID: 2 },{ value: 'beta',productID: 3 },{ value: 'bannana',productID: 4 },{ value: 'gamma',productID: 5 },{ value: 'grape',productID: 6 },{ value: 'delta',productID: 7 },{ value: 'dragonfruit',productID: 8 },{ value: 'diamond',productID: 9 }
];
// Typeahead handler
ko.bindingHandlers.typeahead = {
init: function (element,valueAccessor,allBindingsAccessor) {
var $e = $(element),productNameVal = allBindingsAccessor().productNameVal,productIDVal = allBindingsAccessor().productIDVal;
var updateValues = function(datum) {
productNameVal(datum.value);
productIDVal(datum.productID);
};
$e.typeahead({
name: 'products',local: my.productsList
}).on('typeahead:selected',function (el,datum) {
updateValues(datum);
}).on('typeahead:autocompleted',datum) {
updateValues(datum);
}).blur(function () {
var el,val,arrayCheck;
el = $(this);
val = el.val();
arrayCheck = ($.grep(my.productsList,function (n) { return n.value === val; }).length !== 0);
if (!arrayCheck) {
el.val('');
source('');
productIDVal(0);
}
});
}
};
// Apply bindings
$(document).ready(function () {
ko.applyBindings(new my.ProductsModel(my.initialData));
});
解决方法
您需要使新添加的项的属性也可观察.
最初的项目正在运行,因为在self.products中
self.products =
ko.observableArray(ko.utils.arrayMap(products,productID: ko.observable(product.productID)
};
}));
您已创建具有可观察属性的项目.
因此,将addProduct函数更改为：
self.addProduct = function () {
self.products.push({
productName: ko.observable(""),productID: ko.observable(0)
});
};
