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November 24, 2020 21:56
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Tiny form serialization helper
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function serializeForm(form, urlEncode = false) { | |
const formData = new FormData(form); | |
if (urlEncode) { | |
const searchParams = new URLSearchParams(formData) | |
return searchParams.toString(); | |
} | |
const serializedFormData = {}; | |
// The code below casts `<select multiple>` and checkboxes values to array | |
// when more than one option is selected. | |
for (const [key, value] of formData) { | |
if (key in serializedFormData) { | |
const serializedValue = serializedFormData[key]; | |
serializedFormData[key] = Array.isArray(serializedValue) | |
? [...serializedValue, value] | |
: [serializedValue, value]; | |
continue; | |
} | |
serializedFormData[key] = value; | |
} | |
return serializedFormData; | |
}; | |
document.getElementById("form").addEventListener("submit", event => { | |
event.preventDefault(); | |
const formData = serializeForm(event.target); | |
console.log(formData); | |
}); |
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