Javascript 如何通过JS或jQuery操作textarea中选定的文本？

我写了一个关于抓取选定文本的小片段，效果很好。 HTML

我想用高亮显示的test！包装一个p标记

This is just
<p>a test!</p>

我能行

selectedText = "<p>"+selectedText+"</p>"

但是接下来呢？如何将其放入文本区域并保留其他文本

---

谢谢

表单字段（如textareas）仅显示纯文本，即不会在其中呈现HTML代码。

这应该可以：

var selectedText = textComponent.value.substring(startPos, endPos);
var precedingText = textComponent.value.substr(0, startPos - 1);
var followingText = textComponent.value.substr(endPos + 1);
textComponent.innerHTML = precedingText 
    + "<p>" + selectedText + "</p>" 
    + followingText;

---

但对于浏览器无关的解决方案，您确实应该考虑使用jQuery。这很有趣

首先，p标记是否突出显示文本？如果是这样，那么

答案有很多：

DOM对象 var wrapper=document.createElement p

wrapper.appendChild textComponent

警报包装器.outerHTML

使用Jquery var wrapper=$textComponent.wrapp[0]

警报包装器.outerHTML

使用简单的JS textComponent.innerHTML=+textComponent.innerHTML+

警报textComponent.outerHTML

---

按原样尝试此代码：

$(function () {
    $("button").on("click", function () {
        var el = document.getElementById("text");
        replaceSelectedText(el);
    });
});

function getInputSelection(el) {
    var start = 0,
        end = 0,
        normalizedValue, range,
        textInputRange, len, endRange;

    if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
        start = el.selectionStart;
        end = el.selectionEnd;
    } else {
        range = document.selection.createRange();

        if (range && range.parentElement() == el) {
            len = el.value.length;
            normalizedValue = el.value.replace(/\r\n/g, "\n");

            textInputRange = el.createTextRange();
            textInputRange.moveToBookmark(range.getBookmark());

            // Check if the start and end of the selection are at the very end
            // of the input, since moveStart/moveEnd doesn't return what we want
            // in those cases
            endRange = el.createTextRange();
            endRange.collapse(false);

            if (textInputRange.compareEndPoints("StartToEnd", endRange) > -1) {
                start = end = len;
            } else {
                start = -textInputRange.moveStart("character", -len);
                start += normalizedValue.slice(0, start).split("\n").length - 1;

                if (textInputRange.compareEndPoints("EndToEnd", endRange) > -1) {
                    end = len;
                } else {
                    end = -textInputRange.moveEnd("character", -len);
                    end += normalizedValue.slice(0, end).split("\n").length - 1;
                }
            }
        }
    }

    return {
        start: start,
        end: end
    };
}

function replaceSelectedText(el) {
    var sel = getInputSelection(el),
        val = el.value;
    text = '<p>'+val.slice(sel.start,sel.end)+'</p>';
    el.value = val.slice(0, sel.start) + text + val.slice(sel.end);
}

---

如果您只想在文本区域中添加其他文本，可以执行以下操作：$'myTextarea'.val$'myTextarea'.val+'some additional text'。此外，您可以通过使用选择器包装字符串，将其转换为jQuery元素：$+selectedText+

.appendTomyDiv；这不是我想要的，sry

selectedText = "<p>"+selectedText+"</p>"

var selectedText = textComponent.value.substring(startPos, endPos);
var precedingText = textComponent.value.substr(0, startPos - 1);
var followingText = textComponent.value.substr(endPos + 1);
textComponent.innerHTML = precedingText 
    + "<p>" + selectedText + "</p>" 
    + followingText;

$(function () {
    $("button").on("click", function () {
        var el = document.getElementById("text");
        replaceSelectedText(el);
    });
});

function getInputSelection(el) {
    var start = 0,
        end = 0,
        normalizedValue, range,
        textInputRange, len, endRange;

    if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
        start = el.selectionStart;
        end = el.selectionEnd;
    } else {
        range = document.selection.createRange();

        if (range && range.parentElement() == el) {
            len = el.value.length;
            normalizedValue = el.value.replace(/\r\n/g, "\n");

            textInputRange = el.createTextRange();
            textInputRange.moveToBookmark(range.getBookmark());

            // Check if the start and end of the selection are at the very end
            // of the input, since moveStart/moveEnd doesn't return what we want
            // in those cases
            endRange = el.createTextRange();
            endRange.collapse(false);

            if (textInputRange.compareEndPoints("StartToEnd", endRange) > -1) {
                start = end = len;
            } else {
                start = -textInputRange.moveStart("character", -len);
                start += normalizedValue.slice(0, start).split("\n").length - 1;

                if (textInputRange.compareEndPoints("EndToEnd", endRange) > -1) {
                    end = len;
                } else {
                    end = -textInputRange.moveEnd("character", -len);
                    end += normalizedValue.slice(0, end).split("\n").length - 1;
                }
            }
        }
    }

    return {
        start: start,
        end: end
    };
}

function replaceSelectedText(el) {
    var sel = getInputSelection(el),
        val = el.value;
    text = '<p>'+val.slice(sel.start,sel.end)+'</p>';
    el.value = val.slice(0, sel.start) + text + val.slice(sel.end);
}