如何在当前光标位置的文本区域中插入文本? [英] How to insert text into the textarea at the current cursor position?

问题描述

我想创建一个简单的函数，将文本添加到用户光标位置的文本区域.它必须是一个干净的功能.只是基础.我能找出其余的.

I would like to create a simple function that adds text into a text area at the user's cursor position. It needs to be a clean function. Just the basics. I can figure out the rest.

推荐答案

使用selectionStart/selectionEnd

Use selectionStart/selectionEnd properties of the input element (works for <textarea> as well)

function insertAtCursor(myField, myValue) {
    //IE support
    if (document.selection) {
        myField.focus();
        sel = document.selection.createRange();
        sel.text = myValue;
    }
    //MOZILLA and others
    else if (myField.selectionStart || myField.selectionStart == '0') {
        var startPos = myField.selectionStart;
        var endPos = myField.selectionEnd;
        myField.value = myField.value.substring(0, startPos)
            + myValue
            + myField.value.substring(endPos, myField.value.length);
    } else {
        myField.value += myValue;
    }
}

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