js+css实现带附件发送邮件表单效果代码-html代码-BFW代码库

代码语言：html
代码描述：js+css实现带附件发送邮件表单效果代码
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<!DOCTYPE html>
<html lang="en" >

<head>
  <meta charset="UTF-8">
  

  
<style>
@charset "UTF-8";
/* Reset box-model and set borders */
/* ============================================ */
*,
::before,
::after {
  box-sizing: border-box;
  border-style: solid;
  border-width: 0;
}

/* Document */
/* ============================================ */
/**
 * 1. Correct the line height in all browsers.
 * 2. Prevent adjustments of font size after orientation changes in iOS.
 * 3. Remove gray overlay on links for iOS.
 * 4. Render kerning consistently in all browsers.
 * 5. Correct font smoothing for macOS.
 * 6. Fix bottom navigation area issue for Safari 15+.
 */
html {
  line-height: 1.5;
  /* 1 */
  -webkit-text-size-adjust: 100%;
  /* 2 */
  -webkit-tap-highlight-color: transparent;
  /* 3 */
  font-feature-settings: "kern";
  /* 4 */
  -webkit-font-feature-settings: "kern";
  /* 5 */
  -moz-font-feature-settings: "kern";
  /* 5 */
  -webkit-font-smoothing: antialiased;
  /* 5 */
  -moz-osx-font-smoothing: grayscale;
  /* 5 */
}

/* Sections */
/* ============================================ */
/**
 * Remove the margin in all browsers.
 */
body {
  margin: 0;
}

/**
 * Render the `main` element consistently in IE.
 */
main {
  display: block;
}

/* Vertical rhythm */
/* ============================================ */
p,
table,
blockquote,
address,
pre,
iframe,
form,
figure,
dl {
  margin: 0;
}

/* Headings */
/* ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: inherit;
  font-weight: inherit;
  margin: 0;
}

/* Lists (enumeration) */
/* ============================================ */
ul,
ol,
menu {
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Lists (definition) */
/* ============================================ */
dd {
  margin-left: 0;
}

/* Grouping content */
/* ============================================ */
/**
 * 1. Add the correct box sizing in Firefox.
 * 2. Show the overflow in Edge and IE.
 */
hr {
  box-sizing: content-box;
  /* 1 */
  height: 0;
  /* 1 */
  overflow: visible;
  /* 2 */
  border-top-width: 1px;
  margin: 0;
  clear: both;
  color: inherit;
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 * 3. Wrap lines by default instead of overflow.
 */
pre {
  font-family: inherit;
  /* 1 */
  font-size: inherit;
  /* 2 */
  white-space: pre-line;
  /* 3 */
}

address {
  font-style: inherit;
}

/* Text-level semantics */
/* ============================================ */
/**
 * Remove the gray background on active links in IE 10.
 */
a {
  background-color: transparent;
  text-decoration: none;
  color: inherit;
}

/**
 * 1. Remove the bottom border in Chrome 57-
 * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
 */
abbr[title] {
  border-bottom: none;
  /* 1 */
  text-decoration: none;
  /* 2 */
}

/**
 * Add the correct font weight in Chrome, Edge, and Safari.
 */
b,
strong {
  font-weight: bolder;
}

/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */
code,
kbd,
samp {
  font-family: "Menlo", "Monaco", "Consolas", "Courier New", monospace;
  /* 1 */
  font-size: inherit;
  /* 2 */
}

/**
 * Add the correct font size in all browsers.
 */
small {
  font-size: 80%;
}

/**
 * Prevent `sub` and `sup` elements from affecting the line height in all browsers.
 */
sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

/* Replaced content */
/* ============================================ */
/**
 * Prevent vertical alignment issues.
 */
svg,
img,
embed,
object,
iframe {
  vertical-align: bottom;
}

/* Forms */
/* ============================================ */
/**
 * Reset form fields to make them styleable.
 * 1. Make form elements stylable across systems iOS especially.
 * 2. Inherit text-transform from parent.
 */
button,
input,
optgroup,
select,
textarea {
  -webkit-appearance: none;
  /* 1 */
  appearance: none;
  vertical-align: middle;
  color: inherit;
  font: inherit;
  background: transparent;
  padding: 0;
  margin: 0;
  border-radius: 0;
  text-align: inherit;
  text-transform: inherit;
  /* 2 */
}

/**
 * Correct cursors for clickable elements.
 */
button,
[type=button],
[type=reset],
[type=submit] {
  cursor: pointer;
}

button:disabled,
[type=button]:disabled,
[type=reset]:disabled,
[type=submit]:disabled {
  cursor: default;
}

/**
 * Clickable labels and selects.
 */
select,
label {
  cursor: pointer;
}

/**
 * Improve outlines for Firefox and unify style with input elements & buttons.
 */
:-moz-focusring {
  outline: auto;
}

select:disabled {
  opacity: inherit;
}

/**
 * 1. Remove padding.
 */
option {
  padding: 0;
  /* 1 */
}

/**
 * Reset to invisible
 */
fieldset {
  margin: 0;
  padding: 0;
  min-width: 0;
}

legend {
  padding: 0;
}

/**
 * Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */
progress {
  vertical-align: baseline;
}

/**
 * Remove the default vertical scrollbar in IE 10+.
 */
textarea {
  overflow: auto;
}

/**
 * Correct the cursor style of increment and decrement buttons in Chrome.
 */
[type=number]::-webkit-inner-spin-button,
[type=number]::-webkit-outer-spin-button {
  height: auto;
}

/**
 * Correct the outline style in Safari.
 */
[type=search] {
  outline-offset: -2px;
}

/**
 * Remove the inner padding in Chrome and Safari on macOS.
 */
[type=search]::-webkit-search-decoration {
  -webkit-appearance: none;
}

/*
 * Remove the ‘X’ from Chrome and Safari.
 */
input[type=search]::-webkit-search-decoration,
input[type=search]::-webkit-search-cancel-button,
input[type=search]::-webkit-search-results-button,
input[type=search]::-webkit-search-results-decoration {
  display: none;
}

/**
 * 1. Hide file input completely.
 * 2. Remove selected file text.
 * 3. Set cursor to pointer for all browsers.
 */
input[type=file] {
  opacity: 0;
  /* 1 */
  font-size: 0;
  /* 2 */
  cursor: pointer;
  /* 3 */
}

/**
	* Fix appearance for Firefox
	*/
[type=number] {
  -moz-appearance: textfield;
}

/* Interactive */
/* ============================================ */
/*
 * Add the correct display in Edge, IE 10+, and Firefox.
 */
details {
  display: block;
}

/*
 * Add the correct display in all browsers.
 */
summary {
  display: list-item;
}

/*
 * Hide focus outline but keep it visible for Windows High Contrast Mode.
 */
:focus,
[contenteditable]:focus {
  outline-style: solid;
  outline-color: transparent;
}

/* Tables */
/* ============================================ */
/**
1. Correct table border color inheritance in all Chrome and Safari.
*/
table {
  border-color: inherit;
  /* 1 */
  border-collapse: collapse;
}

caption {
  text-align: left;
}

td,
th {
  vertical-align: top;
  padding: 0;
}

th {
  text-align: left;
  font-weight: inherit;
}

/* Misc */
/* ============================================ */
/*
 * Make placeholder style consistent across all browsers.
 */
::placeholder {
  opacity: 1;
  /* stylelint-disable-next-line color-named */
  color: darkgray;
}

/*
 * Hide input arrow when used with datalist.
 */
::-webkit-calendar-picker-indicator {
  /* stylelint-disable-next-line declaration-no-important */
  display: none !important;
}

/*
 * 1. Remove image default bottom space.
 * 2. Prevent image from overflowing the container.
 */
img {
  display: block;
  max-width: 100%;
}

.visually-hidden {
  position: absolute;
  top: auto;
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
  width: 1px;
  height: 1px;
  white-space: nowrap;
}
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background-color: #fafafa;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Open Sans", system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
}

.mail-wrapper {
  position: relative;
}

.mail {
  position: relative;
  border-radius: 8px;
  padding: calc(1em + 8px);
  width: 520px;
  background-color: #fff;
  box-shadow: inset 0 0 1px 1px rgba(9, 0, 80, 0.2), inset 0 -2px 1px rgba(9, 0, 80, 0.1), 0 1px 2px rgba(9, 0, 80, 0.2), 0 1px 8px rgba(9, 0, 80, 0.1);
  overflow: hidden;
}
.mail::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: repeating-linear-gradient(45deg, transparent 0 16px, #d51122 0 32px, transparent 0 48px, #2770cb 0 64px);
  clip-path: polygon(0% 0%, 0% 100%, 8px 100%, 8px 8px, calc(100% - 8px) 8px, calc(100% - 8px) calc(100% - 8px), 8px calc(100% - 8px), 8px 100%, 100% 100%, 100% 0%);
}

.mail-title {
  margin-bottom: 0.5em;
  font-weight: 600;
  color: #2770cb;
}

.mail-field {
  display: block;
  width: 100%;
  font-style: italic;
}
.mail-field:not(.content) {
  margin-bottom: 8px;
  background-image: linear-gradient(#a2a0ae 0 1px);
  background-position-y: bottom;
  background-size: 100% 1px;
  background-repeat: no-repeat;
}
.mail-field.content {
  background-image: repeating-linear-gradient(to bottom, transparent 0 calc(1.5em - 1px), #a2a0ae calc(1.5em - 1px) 1.5em);
  background-attachment: local;
  resize: none;
}
.mail-field::placeholder {
  font-style: normal;
  color: #b5b2c6;
}

.mail-content-section {
  display: flex;
  column-gap: 1.5em;
  align-items: stretch;
  margin-top: 1.5em;
}

.mail-attachment-container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-shrink: 0;
  position: relative;
  border: 1px dashed #a2a0ae;
  border-radius: 4px;
  padding: 4px 8px;
  width: 110px;
  height: 110px;
  transition-property: border-color, background-color;
  transition-duration: 0.2s;
}
.mail-attachment-container:not(.filled):hover, .mail-attachment-container.drag-over {
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