javascript 单击时如何从输入字段中删除最后一个字符？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/12186603/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I remove last character from input field on click?
提问by jeni
I have a form that when buttons are clicked, it enters a value into an input field. I want to add another button that deletes the last character added. How would I accomplish this using jQuery
我有一个表单，当单击按钮时，它会在输入字段中输入一个值。我想添加另一个按钮来删除添加的最后一个字符。我将如何使用 jQuery 完成此操作
回答by arjuncc
<script>
function addTextTag(txt)
{
document.getElementById("text_tag_input").value+=txt;
}
function removeTextTag()
{
var strng=document.getElementById("text_tag_input").value;
document.getElementById("text_tag_input").value=strng.substring(0,strng.length-1)
}
</script>
<input id="text_tag_input" type="text" name="tags" />
<div class="tags_select">
<a href="javascript:addTextTag('1')">1</a>
<a href="javascript:addTextTag('2')">2</a>
<a href="javascript:addTextTag('3')">3</a>
<a href="javascript:removeTextTag()">delete</a>
</div>?
Used a modified version of your code itself try
使用您的代码本身的修改版本尝试
回答by nathan gonzalez
the simple answer is, if you are using jquery, to do something like this:
简单的答案是，如果您使用 jquery，请执行以下操作：
//select the button, add a click event
$('#myButtonId').on('click',function () {
//get the input's value
var textVal = $('#myInputId').val();
//set the input's value
$('#myInputId').val(textVal.substring(0,textVal.length - 1));
});
回答by austincheney
var lastChar = function (x) {
"use strict";
var a = document.getElementById(x),
b = a.value;
a.value = b.substring(0, b.length - 1);
};
No jQuery required. The x variable is the id of the input you want to mutilate.
不需要jQuery。x 变量是您要删除的输入的 ID。
