filterforms.js

/**
 * es6
 */
function filterForms(target) {
    const formData = (new FormData(target)).entries()

    let filtered = {}

    for (let pair of formData) {
      // filtered[pair[0]] = pair[1].trim()       
      if (typeof filtered[pair[0]] === 'undefined') {
        filtered[pair[0]] = pair[1].trim()        
      } else if (Array.isArray(filtered[pair[0]])) {
        filtered[pair[0]].push(pair[1].trim())
      } else {
        let temp = []
        temp.push(filtered[pair[0]])
        temp.push(pair[1].trim())
        filtered[pair[0]] = temp
      }
    }
    return filtered
  }

/**
 * es5
 */
function filterForms(target) {
    const inputs = target.querySelectorAll('input')
    let filtered = {}
    
    inputs.forEach(entry => {
    	const name = entry.name
        if (entry.multiple) {
        	const options = entry.selectedOptions
            const files = entry.files
            const values = []
            if (options) {
              for(let pair of options) {
                  values.push(pair.value)
              }
            } else if (files) {
            	for(let file of files) {
                	values.push(file)
                }
            }
            if (values.length) {
             	filtered[name] = values
            }
            
        } else {
          const val = entry.value
          if (typeof val === "string") {
          	filtered[name] = val
          }
    	}
    })
    return filtered
}