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Reduce Knockout.js footprint by using ECMAScript 2020

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the-djmaze 2022-09-13 23:49:18 +02:00
parent 6cc3745c5f
commit 9b8778f823
15 changed files with 1437 additions and 1482 deletions
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117
vendors/knockout/src/binding/selectExtensions.js vendored
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@ -1,62 +1,61 @@
(() => {
var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
// Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
// are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
// that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
ko.selectExtensions = {
readValue : element => {
switch (element.nodeName) {
case 'OPTION':
return (element[hasDomDataExpandoProperty] === true)
? ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey)
: element.value;
case 'SELECT':
return element.selectedIndex >= 0
? ko.selectExtensions.readValue(element.options[element.selectedIndex])
: undefined;
default:
return element.value;
}
},
const hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
writeValue: (element, value, allowUnset) => {
switch (element.nodeName) {
case 'OPTION':
if (typeof value === "string") {
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
delete element[hasDomDataExpandoProperty];
element.value = value;
}
else {
// Store arbitrary object using DomData
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
element[hasDomDataExpandoProperty] = true;
// Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
element.value = typeof value === "number" ? value : "";
}
break;
case 'SELECT':
// A blank string or null value will select the caption
var selection = -1, noValue = ("" === value || null == value),
i = element.options.length, optionValue;
while (i--) {
optionValue = ko.selectExtensions.readValue(element.options[i]);
// Include special check to handle selecting a caption with a blank string value
if (optionValue == value || (optionValue === "" && noValue)) {
selection = i;
break;
}
}
if (allowUnset || selection >= 0 || (noValue && element.size > 1)) {
element.selectedIndex = selection;
}
break;
default:
element.value = (value == null) ? "" : value;
break;
}
// Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
// are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
// that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
ko.selectExtensions = {
readValue : element => {
switch (element.nodeName) {
case 'OPTION':
return (element[hasDomDataExpandoProperty] === true)
? ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey)
: element.value;
case 'SELECT':
return element.selectedIndex >= 0
? ko.selectExtensions.readValue(element.options[element.selectedIndex])
: undefined;
default:
return element.value;
}
};
})();
},
writeValue: (element, value, allowUnset) => {
switch (element.nodeName) {
case 'OPTION':
if (typeof value === "string") {
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
delete element[hasDomDataExpandoProperty];
element.value = value;
}
else {
// Store arbitrary object using DomData
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
element[hasDomDataExpandoProperty] = true;
// Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
element.value = typeof value === "number" ? value : "";
}
break;
case 'SELECT':
// A blank string or null value will select the caption
var selection = -1, noValue = ("" === value || null == value),
i = element.options.length, optionValue;
while (i--) {
optionValue = ko.selectExtensions.readValue(element.options[i]);
// Include special check to handle selecting a caption with a blank string value
if (optionValue == value || (optionValue === "" && noValue)) {
selection = i;
break;
}
}
if (allowUnset || selection >= 0 || (noValue && element.size > 1)) {
element.selectedIndex = selection;
}
break;
default:
element.value = (value == null) ? "" : value;
break;
}
}
};