gristlabs_grist-core/test/client/lib/koDom.js

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/* global describe, it */
var assert = require('assert');
var ko = require('knockout');
var sinon = require('sinon');
var dom = require('app/client/lib/dom');
var kd = require('app/client/lib/koDom');
var koArray = require('app/client/lib/koArray');
var clientUtil = require('../clientUtil');
describe('koDom', function() {
clientUtil.setTmpMochaGlobals();
describe("simple properties", function() {
it("should update dynamically", function() {
var obs = ko.observable('bar');
var width = ko.observable(17);
var elem = dom('div',
kd.attr('a1', 'foo'),
kd.attr('a2', obs),
kd.attr('a3', function() { return "a3" + obs(); }),
kd.text(obs),
kd.style('width', function() { return width() + 'px'; }),
kd.toggleClass('isbar', function() { return obs() === 'bar'; }),
kd.cssClass(function() { return 'class' + obs(); }));
assert.equal(elem.getAttribute('a1'), 'foo');
assert.equal(elem.getAttribute('a2'), 'bar');
assert.equal(elem.getAttribute('a3'), 'a3bar');
assert.equal(elem.textContent, 'bar');
assert.equal(elem.style.width, '17px');
assert.equal(elem.className, 'isbar classbar');
obs('BAZ');
width('34');
assert.equal(elem.getAttribute('a1'), 'foo');
assert.equal(elem.getAttribute('a2'), 'BAZ');
assert.equal(elem.getAttribute('a3'), 'a3BAZ');
assert.equal(elem.textContent, 'BAZ');
assert.equal(elem.style.width, '34px');
assert.equal(elem.className, 'classBAZ');
obs('bar');
assert.equal(elem.className, 'isbar classbar');
});
});
describe("domData", function() {
it("should set domData and reflect observables", function() {
var foo = ko.observable(null);
var elem = dom('div',
kd.domData('foo', foo),
kd.domData('bar', 'BAR')
);
assert.equal(ko.utils.domData.get(elem, 'foo'), null);
assert.equal(ko.utils.domData.get(elem, 'bar'), 'BAR');
foo(123);
assert.equal(ko.utils.domData.get(elem, 'foo'), 123);
});
});
describe("scope", function() {
it("should handle any number of children", function() {
var obs = ko.observable();
var elem = dom('div', 'Hello',
kd.scope(obs, function(value) {
return value;
}),
'World');
assert.equal(elem.textContent, "HelloWorld");
obs("Foo");
assert.equal(elem.textContent, "HelloFooWorld");
obs([]);
assert.equal(elem.textContent, "HelloWorld");
obs(["Foo", "Bar"]);
assert.equal(elem.textContent, "HelloFooBarWorld");
obs(null);
assert.equal(elem.textContent, "HelloWorld");
obs([dom.frag("Foo", dom("span", "Bar")), dom("div", "Baz")]);
assert.equal(elem.textContent, "HelloFooBarBazWorld");
});
it("should cope with children getting removed outside", function() {
var obs = ko.observable();
var elem = dom('div', 'Hello', kd.scope(obs, function(v) { return v; }), 'World');
assert.equal(elem.innerHTML, 'Hello<!---->World');
obs(dom.frag(dom('div', 'Foo'), dom('div', 'Bar')));
assert.equal(elem.innerHTML, 'Hello<!----><div>Foo</div><div>Bar</div>World');
elem.removeChild(elem.childNodes[2]);
assert.equal(elem.innerHTML, 'Hello<!----><div>Bar</div>World');
obs(null);
assert.equal(elem.innerHTML, 'Hello<!---->World');
obs(dom.frag(dom('div', 'Foo'), dom('div', 'Bar')));
elem.removeChild(elem.childNodes[3]);
assert.equal(elem.innerHTML, 'Hello<!----><div>Foo</div>World');
obs(dom.frag(dom('div', 'Foo'), dom('div', 'Bar')));
assert.equal(elem.innerHTML, 'Hello<!----><div>Foo</div><div>Bar</div>World');
});
});
describe("maybe", function() {
it("should handle any number of children", function() {
var obs = ko.observable(0);
var elem = dom('div', 'Hello',
kd.maybe(function() { return obs() > 0; }, function() {
return dom("span", "Foo");
}),
kd.maybe(function() { return obs() > 1; }, function() {
return [dom("span", "Foo"), dom("span", "Bar")];
}),
"World");
assert.equal(elem.textContent, "HelloWorld");
obs(1);
assert.equal(elem.textContent, "HelloFooWorld");
obs(2);
assert.equal(elem.textContent, "HelloFooFooBarWorld");
obs(0);
assert.equal(elem.textContent, "HelloWorld");
});
it("should pass truthy value to content function", function() {
var obs = ko.observable(null);
var elem = dom('div', 'Hello', kd.maybe(obs, function(x) { return x; }), 'World');
assert.equal(elem.innerHTML, 'Hello<!---->World');
obs(dom('span', 'Foo'));
assert.equal(elem.innerHTML, 'Hello<!----><span>Foo</span>World');
obs(0); // Falsy values should destroy the content
assert.equal(elem.innerHTML, 'Hello<!---->World');
});
});
describe("foreach", function() {
it("should work with koArray", function() {
var model = koArray();
// Make sure the loop notices elements already in the model.
model.assign(["a", "b", "c"]);
var elem = dom('div', "[",
kd.foreach(model, function(item) {
return dom('span', ":", dom('span', kd.text(item)));
}),
"]"
);
assert.equal(elem.textContent, "[:a:b:c]");
// Delete all elements.
model.splice(0);
assert.equal(elem.textContent, "[]");
// Test push.
model.push("hello");
assert.equal(elem.textContent, "[:hello]");
model.push("world");
assert.equal(elem.textContent, "[:hello:world]");
// Test splice that replaces some elements with more.
model.splice(0, 1, "foo", "bar", "baz");
assert.equal(elem.textContent, "[:foo:bar:baz:world]");
// Test splice which removes some elements.
model.splice(-3, 2);
assert.equal(elem.textContent, "[:foo:world]");
// Test splice which adds some elements in the middle.
model.splice(1, 0, "test2", "test3");
assert.equal(elem.textContent, "[:foo:test2:test3:world]");
});
it("should work when items disappear from under it", function() {
var elements = [dom('span', 'a'), dom('span', 'b'), dom('span', 'c')];
var model = koArray();
model.assign(elements);
var elem = dom('div', '[', kd.foreach(model, function(item) { return item; }), ']');
assert.equal(elem.textContent, "[abc]");
// Plain splice out.
var removed = model.splice(1, 1);
assert.deepEqual(removed, [elements[1]]);
assert.deepEqual(model.peek(), [elements[0], elements[2]]);
assert.equal(elem.textContent, "[ac]");
// Splice it back in.
model.splice(1, 0, elements[1]);
assert.equal(elem.textContent, "[abc]");
// Now remove the element from DOM manually.
elem.removeChild(elements[1]);
assert.equal(elem.textContent, "[ac]");
assert.deepEqual(model.peek(), elements);
// Use splice again, and make sure it still does the right thing.
removed = model.splice(2, 1);
assert.deepEqual(removed, [elements[2]]);
assert.deepEqual(model.peek(), [elements[0], elements[1]]);
assert.equal(elem.textContent, "[a]");
removed = model.splice(0, 2);
assert.deepEqual(removed, [elements[0], elements[1]]);
assert.deepEqual(model.peek(), []);
assert.equal(elem.textContent, "[]");
});
it("should work when items are null", function() {
var model = koArray();
var elem = dom('div', '[',
kd.foreach(model, function(item) { return item && dom('span', item); }),
']');
assert.equal(elem.textContent, "[]");
model.splice(0, 0, "a", "b", "c");
assert.equal(elem.textContent, "[abc]");
var childCount = elem.childNodes.length;
model.splice(1, 1, null);
assert.equal(elem.childNodes.length, childCount - 1); // One child removed, non added.
assert.equal(elem.textContent, "[ac]");
model.splice(1, 0, "x");
assert.equal(elem.textContent, "[axc]");
model.splice(3, 0, "y");
assert.equal(elem.textContent, "[axyc]");
model.splice(1, 2);
assert.equal(elem.textContent, "[ayc]");
model.splice(0, 3);
assert.equal(elem.textContent, "[]");
});
it("should dispose subscribables for detached nodes", function() {
var obs = ko.observable("AAA");
var cb = sinon.spy(function(x) { return x; });
var data = koArray([ko.observable("foo"), ko.observable("bar")]);
var elem = dom('div', kd.foreach(data, function(item) {
return dom('div', kd.text(function() { return cb(item() + ":" + obs()); }));
}));
assert.equal(elem.innerHTML, '<!----><div>foo:AAA</div><div>bar:AAA</div>');
obs("BBB");
assert.equal(elem.innerHTML, '<!----><div>foo:BBB</div><div>bar:BBB</div>');
data.splice(1, 1);
assert.equal(elem.innerHTML, '<!----><div>foo:BBB</div>');
cb.resetHistory();
// Below is the core of the test: we are checking that the computed observable created for
// the second item of the array ("bar") does NOT trigger a call to cb.
obs("CCC");
assert.equal(elem.innerHTML, '<!----><div>foo:CCC</div>');
sinon.assert.calledOnce(cb);
sinon.assert.calledWith(cb, "foo:CCC");
});
});
});