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Diffstat (limited to 'thirdparty/preact/src/linked-state.js')
-rw-r--r-- | thirdparty/preact/src/linked-state.js | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/thirdparty/preact/src/linked-state.js b/thirdparty/preact/src/linked-state.js new file mode 100644 index 000000000..ed72bd8bc --- /dev/null +++ b/thirdparty/preact/src/linked-state.js @@ -0,0 +1,28 @@ +import { isString, delve } from './util'; + +/** Create an Event handler function that sets a given state property. + * @param {Component} component The component whose state should be updated + * @param {string} key A dot-notated key path to update in the component's state + * @param {string} eventPath A dot-notated key path to the value that should be retrieved from the Event or component + * @returns {function} linkedStateHandler + * @private + */ +export function createLinkedState(component, key, eventPath) { + let path = key.split('.'), + p0 = path[0]; + return function(e) { + let t = e && e.currentTarget || this, + s = component.state, + obj = s, + v = isString(eventPath) ? delve(e, eventPath) : t.nodeName ? ((t.nodeName+t.type).match(/^input(che|rad)/i) ? t.checked : t.value) : e, + i; + if (path.length>1) { + for (i=0; i<path.length-1; i++) { + obj = obj[path[i]] || (obj[path[i]] = {}); + } + obj[path[i]] = v; + v = s[p0]; + } + component.setState({ [p0]: v }); + }; +} |