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javascriptc#onkeyup

How to add javascript in page_load

I have javascript code that mask my data in textbox by onkeyup event . 

<script type="text/javascript">
document.getElementById("<%= yourTextbox.ClientID %>").onkeyup = function() {
    if (/^[0-9]{2}(.[0-9]{2})?$/.test(this.value)) {
        this.value += ".";
    }
}
<script>

But I have error

Runtime Error JavaScript: Failed to set property "onkeyup" reference value is not defined or is NULL.

What i need to add in my code to make this work? Asp.net c# framework 2.0 javascript

Solution

  • in C# code on PageLoad

    yourTextbox.Attributes.Add("onkeyup","myFun('"+yourTextbox.ClientID+"');");

    in Javascript

    <script type="text/javascript">
 function myFun(obj) {
    if (/^[0-9]{2}(.[0-9]{2})?$/.test(obj.value)) {
        obj.value += ".";
    }
}
<script>