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placeholder.js
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placeholder.js
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'use strict'
const Promise = require('promise')
/**
* run through some placeholder subjects and set the placeholder to the value
* if they click on it
* @param {DOM} input a DOM input
* @return {Promise}
*/
module.exports = function placeholderKickoff(input) {
let focusable = true
input.addEventListener('focus', () => {
if (focusable) { input.value = input.placeholder }
focusable = false
})
return typePlaceholder(
input,
`Hello my associates, trampolines are for sale!`
)
.then(() => typePlaceholder(
input,
`With such a huge assortment of new items, you'll never get bored`
))
.then(() => {
focusable = false
return typePlaceholder(input, `Your Subject...`, false)
})
}
function typePlaceholder(input, placeholder, shouldErase = true) {
let char = 0
return new Promise((resolve) => {
const interval = setInterval(() => {
if (char >= placeholder.length) {
clearInterval(interval)
return shouldErase ? erase(input).then(resolve) : false
}
input.placeholder = input.placeholder + placeholder[char++]
}, 60)
})
}
function erase(input) {
return new Promise((resolve) => setTimeout(() => {
const interval = setInterval(() => {
if (input.placeholder.length === 0) {
clearInterval(interval)
return setTimeout(() => resolve(), 1000)
}
input.placeholder = input.placeholder.substr(0, input.placeholder.length - 1)
}, 20)
}, 3000))
}