页面加载时调用字符计数javascript函数

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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">&nbsp; 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

<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。

-SA

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".

—SA

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