Getting the length of dynamic textbox content in asp.net using c#

Need assistance with a code snippet that creates dynamic textboxes and their onchange event. The event fires successfully but does not return any value. Any suggestions on how to troubleshoot this issue would be greatly appreciated.

txt_box.Attributes.Add("onchange", "loadValues('" + txt_box.ClientID + "')");

 function loadValues(controlName) {
        alert(controlName);
        // Control name is displayed in the alert message
        var txtValue = document.getElementById(controlName);
       // However, control returns null
        if (txtValue.value.length > 0)
        {
          alert(txtValue.value.length); 
        }
 }

Answer №1

Initially, I was going to give a response similar to Ankush Jain's, but without using jQuery:

function fetchValues(element) {
        alert(element.id);
        //element name displayed here
        var textValue = element.value;
        //element can also be null
        if (textValue.length > 0) {
            alert(textValue.length);
        }
    }


txt_field.Attributes.Add("onchange", "fetchValues(this);");

Answer №2

Give this a shot

txt_box.Attributes.Add("onchange", "loadValues(this)");


 function loadValues(controlName) {
    if($(controlName).attr('id').length > 0){
       var id=  $(controlName).attr('id');
       var val= $('#'+id).val();
       alert(val);
    }
 }

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