文字区域html控件 [英] Text Area html Control
本文介绍了文字区域html控件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有textArea htmlControl，我已将其最大宪章数设置为150.
我需要一个动态文本计数器，当我在其中键入文本时，该计数器会减少文本计数.
I have textArea htmlControl for which i have set Maximum charter count to 150.
I need a dynamic text counter that will decrement the text count as i type text in it.
any link?
推荐答案
This[^] could probably help you get started and create what you want.
看起来像您在寻找这些东西:
JavaScript动态文本区域计数器 [检查TextArea长度 [更多 [
Looks like you are looking for these:
Javascript Dynamic Text Area Counter[^]
Check TextArea Length[^]
If needed, look here for more[^].
这是完整的示例:
This is a full sample:
<html>
<head>
<script type="text/javascript"><!--
function counter(eventInstance, max) {
eventInstance = eventInstance || window.event;
key = eventInstance.keyCode || eventInstance.which;
tarea = document.getElementById("tarea");
output = document.getElementById("output");
allowed = max-tarea.value.length;
output.innerHTML = allowed + " remainin";
if (allowed <= 0 & key != 8) {
eventInstance.preventDefault();
eventInstance.returnValue = false;
return false;
}
} //filterOut
--></script>
</head>
<body">
<textarea id="tarea" onkeypress="counter(event, 150);"></textarea>
<div id="output" />
</body>
</html>
此解决方案显示了如何输出值，以及在超出限制时如何防止输入更多字符.但是，允许使用退格键(并且永远不会阻止删除操作).
This solution shows how to output value, and how to prevent entering more characters if the limit it exceeded. However, backspace is allowed (and delete is never blocked).
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