js簡單富文字編輯器效果程式碼例項

螞蟻小編發表於2017-04-14
原文網址 : https://www.softwhy.com/article-7060-1.html
JS

本章一段程式碼例項，實現了簡單的富文字編輯器功能。

當然這個效果不一定有實用價值，不過可以學習一下知識和開闊一下程式設計思路。

程式碼例項如下:

[HTML] 純文字檢視 複製程式碼
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>螞蟻部落</title>
<style>
* {
  margin: 0;
  padding: 0;
}
li {
  list-style-type: none;
}
label {
  cursor: pointer;
}
#wrap {
  width: 80%;
  height: 400px;
  margin: 20px auto;
  box-shadow: #272727 0px 0px 5px;
}
.menu {
  width: 100%;
  height: 49px;
  border-bottom: 1px solid #272727;
}
.menu > li {
  line-height: 49px;
  height: 49px;
  float: left;
  padding: 0 10px;
  cursor: pointer;
  text-align: center;
  position: relative;
}
.menu > li:after {
  content: "|";
  width: 5px;
  position: absolute;
  right: 0;
  top: 0;
}
.menu > li label {
  width: 100%;
  height: 100%;
  display: inline-block;
}
.edit_wrap {
  width: 96%;
  padding: 2%;
  height: calc(100% - 50px - 4%);
  overflow: auto;
  line-height: 1.5;
  outline: none;
}
.btnBox {
  display: none;
  position: absolute;
  left: 0;
  top: 49px;
  width: 100%;
}
.btnBox > li {
  width: 100%;
  height: 35px;
  line-height: 35px;
  text-align: center;
  background: #fff;
}
input {
  border: none;
  width: 100%;
  height: 100%;
  cursor: pointer;
  outline: none;
  font-size: 16px;
  background: inherit;
}
.menu li:hover ul {
  display: block;
}
.btnBox > li:hover, .menu > li:hover {
  background: #CCCCCC;
}
.item {
  list-style-type: square !important;
  margin-left: 10px;
}
</style>
<script>
window.onload = function() {
  var editWrap = document.querySelector(".edit_wrap"),
    setSizeBtn = document.querySelectorAll(".size"),
    setFormatBtn = document.querySelectorAll(".format"),
    setColorBtn = document.querySelectorAll(".color"),
    setBGColorBtn = document.querySelectorAll(".BGcolor"),
    Fbtn = document.querySelectorAll(".Fbtn"),
    Tbtn = document.querySelectorAll(".Tbtn");
  for (var i = 0; i < 4; i++) {
    setSizeBtn[i].addEventListener("click", setTxtStyle);
    setColorBtn[i].addEventListener("click", setTxtStyle);
    setBGColorBtn[i].addEventListener("click", setTxtStyle);
    setFormatBtn[i].addEventListener("click", setTxtStyle);
  };
  for (var i = 0; i < Fbtn.length; i++) {
    Fbtn[i].addEventListener("click", setTxtStyle);
  };
 
  function setTxtStyle(e) {
    var that = e.target,
      type = "",
      bool = false,
      valueTxt = this.getAttribute("data") || "";
    switch (that.className) {
      case "color":
        type = "ForeColor";
        break;
      case "size":
        type = "FontSize";
        break;
      case "BGcolor":
        type = "BackColor";
        break;
      case "format":
        type = this.getAttribute("data-type");
        break;
      case "Fbtn":
        type = this.getAttribute("data-type");
        break;
      default:
        break;
    };
    document.execCommand(type, bool, valueTxt);
  };
}
</script>
</head>
<body>
  <div id="wrap">
    <ul class="menu">
      <li>
        顏色
        <ul class="btnBox fontColorWrap">
          <li><input type="button" class="color" value="紅" data="red" /></li>
          <li><input type="button" class="color" value="黃" data="yellow" /></li>
          <li><input type="button" class="color" value="綠" data="green" /></li>
          <li><input type="button" class="color" value="藍" data="blue" /></li>
        </ul>
      </li>
      <li>
        字號
        <ul class="btnBox fontSizeWrap">
          <li><input type="button" class="size" value="15px" data="15" /></li>
          <li><input type="button" class="size" value="20px" data="20" /></li>
          <li><input type="button" class="size" value="25px" data="25" /></li>
          <li><input type="button" class="size" value="30px" data="30" /></li>
        </ul>
      </li>
      <li>
        背景顏色
        <ul class="btnBox BGColorWrap">
          <li><input type="button" class="BGcolor" value="紅" data="red" /></li>
          <li><input type="button" class="BGcolor" value="黃" data="yellow" /></li>
          <li><input type="button" class="BGcolor" value="綠" data="green" /></li>
          <li><input type="button" class="BGcolor" value="藍" data="blue" /></li>
        </ul>
      </li>
      <li>
        對齊
        <ul class="btnBox formatWrap">
          <li><input type="button" class="format" value="居中" data-type="JustifyCenter" /></li>
          <li><input type="button" class="format" value="左邊" data-type="JustifyLeft" /></li>
          <li><input type="button" class="format" value="右邊" data-type="JustifyRight" /></li>
          <li><input type="button" class="format" value="無" data-type="JustifyRight" disabled="disabled" /></li>
        </ul>
      </li>
      <li><input type="button" class="Fbtn" value="斜體" data-type="Italic" /></li>
      <li><input type="button" class="Fbtn" value="粗體" data-type="Bold" /></li>
      <li><input type="button" class="Fbtn" value="下劃線" data-type="Underline" /></li>
    </ul>
 
    <div class="edit_wrap" contenteditable="true">
      本站的url地址是<a href="http://www.softwhy.com" target="_blank">www.softwhy.com</a>
    </div>
    </div>
</body>
</html>

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