[英]select2 change ajax url
Im working with knockout.js and select2 plugin. 我正在使用knockout.js和select2插件。
Im trying to change the select2 ajax url based on a value of an observable. 我试图根据一个可观察的值更改select2 ajax网址。
for example if based on some selection i do ajax call to 1 url or another. 例如,如果基于某些选择,我执行ajax调用1 url或另一个。 Here is a sample code:
这是一个示例代码:
<input type="hidden" data-bind="combobox: { optionsText: 'Name', optionsValue: 'ID', optionsCaption: 'Избери...', sourceUrl: partnerUrl }, value: ApplyToSubject" id="ApplyToSubject" name="ApplyToSubject">
This is how the sourceUrl: partnerUrl is retrieved: 这是检索sourceUrl:partnerUrl的方式:
self.partnerUrl = ko.computed(function () {
var value = "";
if (something)
{
value = apiUrls.customer;
}
else if (something else)
{
value = apiUrls.vendor;
}
else if(or another thing)
{
value = apiUrls.employee;
}
return value;
});
I work with custom binding. 我使用自定义绑定。 Here is the code for it:
这是它的代码:
// documentation http://ivaynberg.github.io/select2/
ko.bindingHandlers.combobox = {
init: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var obj = valueAccessor(),
allBindings = allBindingsAccessor();
var optionsText = ko.utils.unwrapObservable(obj.optionsText);
var optionsValue = ko.utils.unwrapObservable(obj.optionsValue);
var sourceUrl = ko.utils.unwrapObservable(obj.sourceUrl);
var selectedID = ko.utils.unwrapObservable(allBindings.value);
var model = obj.model;
var unwrapped = ko.utils.unwrapObservable(obj.model);
$(element).select2({
minimumInputLength: 3,
formatResult: function formatResult(result) {
return result.text;
},
data: function (model) {
return { id: unwrapped[optionsValue](), text: unwrapped[optionsText](), data: unwrapped }
},
initSelection: function (element, callback) {
if (unwrapped && selectedID !== "") {
callback({ id: unwrapped[optionsValue](), text: unwrapped[optionsText](), data: unwrapped });
}
},
ajax: {
quietMillis: 500,
url: subdirUrl + sourceUrl,
dataType: 'json',
data: function (search, page) {
return {
page: page,
search: search
};
},
results: function (data) {
var result = [];
$.each(data.list, function (key, value) {
result.push({ id: value[optionsValue], text: value[optionsText], data: value });
});
var more = data.paging.currentPage < data.paging.pageCount;
return { results: result, more: more };
}
}
});
$(element).on('select2-selected', function (eventData) {
if (eventData.choice) {
// item selected
var selectedItem = eventData.choice.data;
var selectedId = eventData.choice.id;
model(selectedItem);
}
else {
model(undefined);
}
});
ko.utils.domNodeDisposal.addDisposeCallback(element, function () {
$(element).select2('destroy');
});
},
update: function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
var obj = valueAccessor(),
allBindings = allBindingsAccessor();
var selectedID = ko.utils.unwrapObservable(allBindings.value);
$(element).val(selectedID).trigger('change');
}
};
It works for url's that dont change, but for urls that need to update, i cant make it work. 它适用于不改变的网址,但对于需要更新的网址,我无法使其正常工作。 (it seems like its keeping the first url that was passed (sourceUrl).
(看起来它保留了传递的第一个url(sourceUrl)。
I've finally managed to solve this one. 我终于设法解决了这个问题。
From what i could read from the select2 documentation, you should pass string or function to ajax url parameter. 根据我从select2文档中读到的内容,您应该将字符串或函数传递给ajax url参数。 So this is what i've done
所以这就是我所做的
I've written a function that returns value of the observable (which is the url): 我编写了一个返回observable值(即url)的函数:
self.returnUrl = function () {
return self.dynamicUrl();
};
And then i pass that function to my custom binding options: 然后我将该函数传递给我的自定义绑定选项:
<input data-bind="combobox: { ... sourceUrl: $data.returnUrl }, value: ApplyToSubject" type="hidden" >
Then the custom binding works the same as in the code in the question, with a small change: 然后自定义绑定的工作方式与问题中的代码相同,只需稍加改动:
...
ajax: {
url: sourceUrl <- this is the returnUrl function
...
}
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