My client-side JavaScript is set up to populate form fields, but every time the page posts back, the fields get reset. It's frustrating!
I thought the field values were stored in the ViewState during the postback. What's going on here?
EDIT: I noticed that when I stop the debugger at Page_Load() after the postback, the form field values are mysteriously empty. Why is this happening?
Is it possible that the form elements you are filling with client-side JavaScript are disabled? If so, ASP.NET might not recognize the values.
Here is an example:
<asp:TextBox ID="TextBox1" Enabled="False" Runat="Server" />
<script type="text/javascript">
document.forms[0].elements["TextBox1"].style.disabled = false;
document.forms[0].elements["TextBox1"].value = "Value set from Javascript";
</script>
When this code is executed, ASP.NET assumes that the textbox is disabled, and therefore ignores its value during the postback. This means that TextBox1.Text will always be empty. As far as I am aware, this behavior is applicable to all form elements. If ASP.NET believes they are disabled and are later enabled and filled in by client-side JavaScript, their values will not be retained during the postback.
Absolutely. It appears that there may be another issue at play here, such as a faulty OnLoad handler that is not properly verifying the IsPostback field and as a result, erasing the modified values you've made.
Ensure that you are checking for server side initialization properly. One common mistake is failing to check for IsPostBack like this:
if (!Page.IsPostBack) {
// Perform actions
}
Make sure to verify if you are performing a postback or a callback. In the case of a callback, the form field values returned are the same as those originally sent by the page to the client. ASP.NET AJAX seems to store and send these values with each callback, rather than retrieving the form field data again.
After realizing that I had set enabled="false" on the fields, I decided to switch them to readonly="true". However, this did not solve the issue.
Ultimately, I discovered that the best solution was to dynamically set the fields to readonly using JavaScript during runtime.
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