Question

我想在用户点击按钮时将文本添加到textarea。我知道如何连接字符串并将其添加到textarea但我想要的是将文本添加到用户点击的textarea内的位置/位置，然后添加文本单击按钮上的那个位置。

提前致谢

Answer 1

以下是我的参考资料：

<script>
function input(){
    var text = "here the text that you want to input.";
    document.forms.form1.area.value = text;
}    
</script>
<form name='form1'>
    Click<input onclick='input()' type='button' value='BUTTON' id='button'><br>
    <textarea name='area'></textarea>

</form>

显示单击按钮时，添加到textarea的一行文本的示例。为什么我在其中添加了javascript？因为html属性不足以使它成为现实可能会有所帮助：D

Answer 2

单击按钮时，需要在特定位置（插入位置）将文本添加到文本区域。请尝试以下方法：

＆＃13;

var position;
	
    function getCaretPosition() {
        var ctlTextArea = document.getElementById('textArea');
        position = ctlTextArea.selectionStart;
        return position;
    }
	
	/* Needs JQuery */
    $(document).ready(function () {

        jQuery.fn.extend({
            insertAtCaret: function (myValue) {
                return this.each(function (i) {
                    if (document.selection) {
                        //For browsers like Internet Explorer
                        this.focus();
                        sel = document.selection.createRange();
                        sel.text = myValue;
                        this.focus();
                    }
                    else if (this.selectionStart || this.selectionStart == '0') {
                        //For browsers like Firefox and Webkit based
                        var startPos = this.selectionStart;
                        var endPos = this.selectionEnd;
                        var scrollTop = this.scrollTop;
                        this.value = this.value.substring(0, startPos) + myValue + this.value.substring(endPos, this.value.length);
                        this.focus();
                        this.selectionStart = startPos + myValue.length;
                        this.selectionEnd = startPos + myValue.length;
                        this.scrollTop = scrollTop;
                    } else {
                        this.value += myValue;
                        this.focus();
                    }
                })
            }
        });

        $('#btnTest').click(function () {
            $("#textArea").insertAtCaret(' << inserted text! >> ');
        });

    });

＆＃13;

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <meta charset="utf-8" />
    <title>How to add text to textarea when user clicks a button</title>
</head>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>

<script>
// The javascript code goes here...
</script>

<body>
  
<h1>How to add text to textarea when user clicks a button</h1>
<div id="divDroppedFields">
    <textarea id="textArea" name="txtMessageFields" class="required" cols="80" rows="10" onclick="getCaretPosition()" onkeyup="getCaretPosition()">
	In the meantime the cat slowly recovered. The socket of the lost eye presented, it is true, a frightful appearance, but he no longer appeared to suffer any pain.
	</textarea>
</div>
<button id="btnTest">CLICK ME</button>


</body>
</html>

＆＃13;

Answer 3

这是使用JQuery的简单方法。

你的HTML

<textarea id="txtarea"></textarea>
<input type="button" value="add text" id="add" />

你的Jquery

$(document).ready(function(){
  $("#add").click(function(){
      $('#txtarea').html('test');
  });
});

你可以see it in action here

如何在用户单击按钮时将文本添加到textarea

3 个答案: