页面加载时调用字符计数javascript函数 [英] call character count javascript function on page load
问题描述
下面是我的java脚本函数：
函数LimtCharacters（txtMsg，CharLength，指标）{
chars = txtMsg.value。长度;
document.getElementById（指标）.innerHTML = CharLength - chars;
if（chars> CharLength）{
txtMsg.value = txtMsg.value.substring（0，CharLength）;
}
}
及其工作文本框的onkeyup事件如下所示：
below is my java script function :
function LimtCharacters(txtMsg, CharLength, indicator) {
chars = txtMsg.value.length;
document.getElementById(indicator).innerHTML = CharLength - chars;
if (chars > CharLength) {
txtMsg.value = txtMsg.value.substring(0, CharLength);
}
}
and its working on the onkeyup event of the text box like below :
<asp:TextBox runat="server" ID="TxtSms" Width="245px" TextMode="MultiLine" Height="57px"
placeholder="Max 160 Characters" BackColor="LightGray" onkeyup="LimtCharacters(this,160,'lblcount');"
TabIndex="1">
</asp:TextBox>
<label id="lblcount" style="color: Red;" runat="server"> 160</label>
现在我想在页面加载时使用这个，我就是我们主孩子的概念。
所以任何帮助都会受到赞赏，如果有任何人有想法，那就很紧急。
提前感谢。
now i want to use this on page load and i am using master child concept.
so any help would be appreciated and its urgent if any one have idea with example.
thanks in advance.
推荐答案
此操作与ASP.NET无关。也许最简单的方法是：
This action has nothing to do with ASP.NET. Perhaps the simplest way would be this:
<html>
<head>
<title>Do something on load</title>
</head>
<body>
<script>
document.body.onload = function() {
DoSomethingHere();
}
</script>
</body>
</html>
剩余问题是您在问题中显示的功能。我不知道为什么你会做这样奇怪的事情，你怎么能使用硬编码常量160.但很明显，在加载时调用它，你不能使用this;你应该再次通过 ID 获取与你的文本框相关的DOM元素，然后传递它而不是this。
Remaining problem is the function you show in your question. I have no idea why would you do such weird thing and how can you use a hard-coded constant 160. But it's apparent that to call it on load, you cannot use "this"; you should, again, take the DOM element related to your text box by ID and pass it instead of "this".
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