javascript - window.getSelection().getRangeAt(0) innerHTML 不破坏节点

Question

我正在开发一个 JavaScript 扩展，它应该以某种方式包装选定的文本并将其发送到我的服务器。完成“包装”是为了让服务器可以识别突出显示文本的确切位置，即使存在重复也是如此。

我点击了这个链接，How to change CSS of selected text using Google Chrome Extension , 以便能够获取选定的文本。后来我采用了这种方法，How to get selected html text with javascript? ，特别是选择的答案，以获得 innerHTML。问题是，当选择跨不同的 div 时，它会破坏 DOM，或者就像 zyklus 在那个答案中所说的那样“将节点分成两半并创建额外的跨度会产生副作用”。

举个例子，

    <div id="IntroDiv">
        <p>
            <img src="http://localhost:9000/Theme/Images/Intro/logo.png">
            <br><br>
            A neat th<f5e975aa551d1ae4e91e8ce9><div id="IntroDiv"><p>eme for start-ups and small corporations.
        </p>
    </div>

    <div id="ProjectsSlider">
        <div id="ProjectsSliderContent">

            <p class="Title">Projects</p>
            <p class="Subtitle">Samples O</p></div></div></f5e975aa551d1ae4e91e8ce9>eme for start-ups and small corporations.
        </p>
    </div>

    <div id="ProjectsSlider">
        <div id="ProjectsSliderContent">

            <p class="Title">Projects</p>
            <p class="Subtitle">Samples Of Our Work</p>

            <div id="SliderContainer">
                <div class="LeftArrow"></div>
                <div class="RightArrow"></div>
                <div class="ThreeD swiper-container stop-swiping">
                    <div class="swiper-wrapper swiper-no-swiping" style="width: 2365px; height: 285px; transform: translate3d(-430px, 0px, 0px); -webkit-transform: translate3d(-430px, 0px, 0px); transition-duration: 0s; -webkit-transition-duration: 0s;"><div class="swiper-slide swiper-slide-duplicate" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -336px) rotateX(0deg) rotateY(-75deg); -webkit-transform: translate3d(0px, 0px, -336px) rotateX(0deg) rotateY(-75deg); z-index: -2; background-image: url(http://placehold.it/215x270/);">Project 3</div><div class="swiper-slide swiper-slide-duplicate" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -224px) rotateX(0deg) rotateY(-50deg); -webkit-transform: translate3d(0px, 0px, -224px) rotateX(0deg) rotateY(-50deg); z-index: -1; background-image: url(http://placehold.it/215x270/);">Project 4</div><div class="swiper-slide swiper-slide-duplicate swiper-slide-visible swiper-slide-active" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -112px) rotateX(0deg) rotateY(-25deg); -webkit-transform: translate3d(0px, 0px, -112px) rotateX(0deg) rotateY(-25deg); z-index: 0; background-image: url(http://placehold.it/215x270/);">Project 5</div> <!-- Add your slides here. You're free to have different styles or content -->
                        <div class="swiper-slide swiper-slide-visible" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, 0px) rotateX(0deg) rotateY(0deg); -webkit-transform: translate3d(0px, 0px, 0px) rotateX(0deg) rotateY(0deg); z-index: 1; background-image: url(http://placehold.it/215x270/);">Project 1</div>
                        <div class="swiper-slide swiper-slide-visible" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -112px) rotateX(0deg) rotateY(25deg); -webkit-transform: translate3d(0px, 0px, -112px) rotateX(0deg) rotateY(25deg); z-index: 0; background-image: url(http://placehold.it/215x270/);">Project 2</div>
                        <div class="swiper-slide" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -224px) rotateX(0deg) rotateY(50deg); -webkit-transform: translate3d(0px, 0px, -224px) rotateX(0deg) rotateY(50deg); z-index: -1; background-image: url(http://placehold.it/215x270/);">Project 3</div>
                        <div class="swiper-slide" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -336px) rotateX(0deg) rotateY(75deg); -webkit-transform: translate3d(0px, 0px, -336px) rotateX(0deg) rotateY(75deg); z-index: -2; background-image: url(http://placehold.it/215x270/);">Project 4</div>
                        <div class="swiper-slide" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -448px) rotateX(0deg) rotateY(100deg); -webkit-transform: translate3d(0px, 0px, -448px) rotateX(0deg) rotateY(100deg); z-index: -3; background-image: url(http://placehold.it/215x270/);">Project 5</div>
                    <div class="swiper-slide swiper-slide-duplicate" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -560px) rotateX(0deg) rotateY(125deg); -webkit-transform: translate3d(0px, 0px, -560px) rotateX(0deg) rotateY(125deg); z-index: -4; background-image: url(http://placehold.it/215x270/);">Project 1</div><div class="swiper-slide swiper-slide-duplicate" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -672px) rotateX(0deg) rotateY(150deg); -webkit-transform: translate3d(0px, 0px, -672px) rotateX(0deg) rotateY(150deg); z-index: -5; background-image: url(http://placehold.it/215x270/);">Project 2</div><div class="swiper-slide swiper-slide-duplicate" style="width: 215px; height: 285px; transition-duration: 0ms; -webkit-transition-duration: 0ms; transform: translate3d(0px, 0px, -784px) rotateX(0deg) rotateY(175deg); -webkit-transform: translate3d(0px, 0px, -784px) rotateX(0deg) rotateY(175deg); z-index: -6; background-image: url(http://placehold.it/215x270/);">Project 3</div></div>

                    <div class="SeePhotos"></div>
                </div>
            </div>

            <ul id="ThreeDSwiperBullets"><li id="0" class="active"></li><li id="1"></li><li id="2"></li><li id="3"></li><li id="4"></li></ul> <!-- Where slider bullets are automatically added according to the slider by JavaScript, Index.js file -->
        </div>
    </div>

我在这里使用 f5e975aa551d1ae4e91e8ce9 来标识文本，就像普通网页中很可能不存在的任何一种独特文本一样。正如您在上面看到的，“IntroDiv”和“ProjectsSlider”出现了两次。这是调用任何函数之前页面的同一部分。

    <div id="IntroDiv">
        <p>
            <img src="Theme/Images/Intro/logo.png">
            <br/><br/>
            A neat theme for start-ups and small corporations.
        </p>
    </div>

    <div id="ProjectsSlider">
        <div id="ProjectsSliderContent">

            <p class="Title">Projects</p>
            <p class="Subtitle">Samples Of Our Work</p>

            <div id="SliderContainer">
                <div class="LeftArrow"></div>
                <div class="RightArrow"></div>
                <div class="ThreeD swiper-container stop-swiping">
                    <div class="swiper-wrapper swiper-no-swiping">  <!-- Add your slides here. You're free to have different styles or content -->
                        <div class="swiper-slide" style="background-image:url('http://placehold.it/215x270/');">Project 1</div>
                        <div class="swiper-slide" style="background-image:url('http://placehold.it/215x270/');">Project 2</div>
                        <div class="swiper-slide" style="background-image:url('http://placehold.it/215x270/');">Project 3</div>
                        <div class="swiper-slide" style="background-image:url('http://placehold.it/215x270/');">Project 4</div>
                        <div class="swiper-slide" style="background-image:url('http://placehold.it/215x270/');">Project 5</div>
                    </div>

                    <div class="SeePhotos"></div>
                </div>
            </div>

            <ul id="ThreeDSwiperBullets"></ul> <!-- Where slider bullets are automatically added according to the slider by JavaScript, Index.js file -->
        </div>
    </div>

那是我的代码。

//save_last_element.js    
document.body.addEventListener('contextmenu', function(e) {
    LAST_SELECTION = window.getSelection().getRangeAt(0);
}, false);


//script.js
if (LAST_SELECTION) {
    var mySelection = LAST_SELECTION.cloneRange();

    var selectionContents = mySelection.cloneContents();
    var div = document.createElement("f5e975aa551d1ae4e91e8ce9");
    div.appendChild(selectionContents);
    mySelection.insertNode(div);
}

有没有办法避免弄乱 DOM？我能否通过完全不同的方法以某种方式识别所选文本的位置？

Answer 1

所以，经过大量尝试，我可以做到。

    var myAnchorNodeValue = window.getSelection().anchorNode.nodeValue;
    var myAnchorOffset = window.getSelection().anchorOffset
    var myFocusOffset =  window.getSelection().focusOffset

    var myFocusNodeLength = window.getSelection().focusNode.nodeValue.length;

    window.getSelection().anchorNode.nodeValue = myAnchorNodeValue.slice(0, myAnchorOffset) + "[IDENTIFY]" + myAnchorNodeValue.slice(myAnchorOffset);

    var myFocusNodeValue = window.getSelection().focusNode.nodeValue;

    if(window.getSelection().focusNode.nodeValue.length - myFocusNodeLength > 0) {
        myFocusOffset += window.getSelection().focusNode.nodeValue.length - myFocusNodeLength;
    }

    window.getSelection().focusNode.nodeValue = myFocusNodeValue.slice(0, myFocusOffset) + "[/IDENTIFY]" + myFocusNodeValue.slice(myFocusOffset);

    LAST_SELECTION = window.getSelection().getRangeAt(0);
    myDocument = document.documentElement.innerHTML;

效果很好。