How to access of hiddenfield value in external .js file

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Hi,

I have a asp hidden field on my web form. I set the hidden field value from the code behind. I want to access this value from a javascript function in external .js file.

This is the asp hidden field

C#

<asp:HiddenField ID="HiddenField1" runat="server" />

I set the value in code behind

JavaScript

HiddenField1.Value = "xyz";

How can I access HiddenField1.value in external .js file.

Give me example...

Thanks
Anand

What I have tried:

var hf=document.getElementById('HiddenField1').value;

Posted 15-Oct-19 21:20pm

Anand Navale

Updated 15-Oct-19 23:08pm

v2

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F-ES Sitecore · Accepted Answer · 2019-10-15T23:09:00

<form runat="server">
    <asp:HiddenField ID="HiddenField1" runat="server" />
</form>

<script>
    var hiddenFieldId = '<%= HiddenField1.ClientID%>';
</script>

<script src="test.js"></script>

test.js

if (typeof hiddenFieldId !== 'undefined') {
    var el = document.getElementById(hiddenFieldId);

    alert(el.value);
}

There is probably a better solution depending on what your javascript is doing though. If you're writing js components that attach to elements it's generally better to read the required ids from data attributes, or to target items in your js via attributes rather than IDs

<form runat="server">
    <input type="hidden" id="HiddenField1" data-targetid runat="server" />
</form>

<script src="test.js"></script>

test.js

var el = document.querySelector("[data-targetid]");

alert(el.value);