forked from knockout/knockout
/
editDetectionBehaviors.js
184 lines (159 loc) · 8.09 KB
/
editDetectionBehaviors.js
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function copyDomNodeChildren(domNode) {
var copy = [];
for (var i = 0; i < domNode.childNodes.length; i++)
copy.push(domNode.childNodes[i]);
return copy;
}
describe('Compare Arrays', {
'Should recognize when two arrays have the same contents': function () {
var subject = ["A", {}, function () { } ];
var compareResult = ko.utils.compareArrays(subject, subject.slice(0));
value_of(compareResult.length).should_be(subject.length);
for (var i = 0; i < subject.length; i++) {
value_of(compareResult[i].status).should_be("retained");
value_of(compareResult[i].value).should_be(subject[i]);
}
},
'Should recognize added items': function () {
var oldArray = ["A", "B"];
var newArray = ["A", "A2", "A3", "B", "B2"];
var compareResult = ko.utils.compareArrays(oldArray, newArray);
value_of(compareResult).should_be([
{ status: "retained", value: "A" },
{ status: "added", value: "A2" },
{ status: "added", value: "A3" },
{ status: "retained", value: "B" },
{ status: "added", value: "B2" }
]);
},
'Should recognize deleted items': function () {
var oldArray = ["A", "B", "C", "D", "E"];
var newArray = ["B", "C", "E"];
var compareResult = ko.utils.compareArrays(oldArray, newArray);
value_of(compareResult).should_be([
{ status: "deleted", value: "A" },
{ status: "retained", value: "B" },
{ status: "retained", value: "C" },
{ status: "deleted", value: "D" },
{ status: "retained", value: "E" }
]);
},
'Should recognize mixed edits': function () {
var oldArray = ["A", "B", "C", "D", "E"];
var newArray = [123, "A", "E", "C", "D"];
var compareResult = ko.utils.compareArrays(oldArray, newArray);
value_of(compareResult).should_be([
{ status: "added", value: 123 },
{ status: "retained", value: "A" },
{ status: "deleted", value: "B" },
{ status: "added", value: "E" },
{ status: "retained", value: "C" },
{ status: "retained", value: "D" },
{ status: "deleted", value: "E" }
]);
}
});
describe('Array to DOM node children mapping', {
before_each: function () {
testNode = document.createElement("div");
},
'Should populate the DOM node by mapping array elements': function () {
var array = ["A", "B"];
var mapping = function (arrayItem) {
var output1 = document.createElement("DIV");
var output2 = document.createElement("DIV");
output1.innerHTML = arrayItem + "1";
output2.innerHTML = arrayItem + "2";
return [output1, output2];
};
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, array, mapping);
value_of(testNode.childNodes.length).should_be(4);
value_of(testNode.childNodes[0].innerHTML).should_be("A1");
value_of(testNode.childNodes[1].innerHTML).should_be("A2");
value_of(testNode.childNodes[2].innerHTML).should_be("B1");
value_of(testNode.childNodes[3].innerHTML).should_be("B2");
},
'Should only call the mapping function for new array elements': function () {
var mappingInvocations = [];
var mapping = function (arrayItem) {
mappingInvocations.push(arrayItem);
return null;
};
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["A", "B"], mapping);
value_of(mappingInvocations).should_be(["A", "B"]);
mappingInvocations = [];
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["A", "A2", "B"], mapping);
value_of(mappingInvocations).should_be(["A2"]);
},
'Should retain existing node instances if the array is unchanged': function () {
var array = ["A", "B"];
var mapping = function (arrayItem) {
var output1 = document.createElement("DIV");
var output2 = document.createElement("DIV");
output1.innerHTML = arrayItem + "1";
output2.innerHTML = arrayItem + "2";
return [output1, output2];
};
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, array, mapping);
var existingInstances = copyDomNodeChildren(testNode);
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, array, mapping);
var newInstances = copyDomNodeChildren(testNode);
value_of(newInstances).should_be(existingInstances);
},
'Should insert added nodes at the corresponding place in the DOM': function () {
var mappingInvocations = [];
var mapping = function (arrayItem) {
mappingInvocations.push(arrayItem);
var output = document.createElement("DIV");
output.innerHTML = arrayItem;
return [output];
};
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["A", "B"], mapping);
value_of(ko.utils.arrayMap(testNode.childNodes, function (x) { return x.innerHTML })).should_be(["A", "B"]);
value_of(mappingInvocations).should_be(["A", "B"]);
mappingInvocations = [];
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["first", "A", "middle1", "middle2", "B", "last"], mapping);
value_of(ko.utils.arrayMap(testNode.childNodes, function (x) { return x.innerHTML })).should_be(["first", "A", "middle1", "middle2", "B", "last"]);
value_of(mappingInvocations).should_be(["first", "middle1", "middle2", "last"]);
},
'Should remove deleted nodes from the DOM': function () {
var mappingInvocations = [];
var mapping = function (arrayItem) {
mappingInvocations.push(arrayItem);
var output = document.createElement("DIV");
output.innerHTML = arrayItem;
return [output];
};
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["first", "A", "middle1", "middle2", "B", "last"], mapping);
value_of(ko.utils.arrayMap(testNode.childNodes, function (x) { return x.innerHTML })).should_be(["first", "A", "middle1", "middle2", "B", "last"]);
value_of(mappingInvocations).should_be(["first", "A", "middle1", "middle2", "B", "last"]);
mappingInvocations = [];
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["A", "B"], mapping);
value_of(ko.utils.arrayMap(testNode.childNodes, function (x) { return x.innerHTML })).should_be(["A", "B"]);
value_of(mappingInvocations).should_be([]);
},
'Should handle sequences of mixed insertions and deletions': function () {
var mappingInvocations = [];
var mapping = function (arrayItem) {
mappingInvocations.push(arrayItem);
var output = document.createElement("DIV");
output.innerHTML = arrayItem || "null";
return [output];
};
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["A"], mapping);
value_of(ko.utils.arrayMap(testNode.childNodes, function (x) { return x.innerHTML })).should_be(["A"]);
value_of(mappingInvocations).should_be(["A"]);
mappingInvocations = [];
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["B"], mapping); // Delete and replace single item
value_of(ko.utils.arrayMap(testNode.childNodes, function (x) { return x.innerHTML })).should_be(["B"]);
value_of(mappingInvocations).should_be(["B"]);
mappingInvocations = [];
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, ["A", "B", "C"], mapping); // Add at beginning and end
value_of(ko.utils.arrayMap(testNode.childNodes, function (x) { return x.innerHTML })).should_be(["A", "B", "C"]);
value_of(mappingInvocations).should_be(["A", "C"]);
mappingInvocations = [];
ko.utils.setDomNodeChildrenFromArrayMapping(testNode, [1, null, "B"], mapping); // Add to beginning; delete from end
value_of(ko.utils.arrayMap(testNode.childNodes, function (x) { return x.innerHTML })).should_be(["1", "null", "B"]);
value_of(mappingInvocations).should_be([1, null]);
}
});