populate hidden form field upon submit

Kim Tompkins asked on February 12, 2021 23:48

Is there a way to populate a hidden form field with data based upon a selection made in a drop down on the page. When the form is submitted the value of the drop down in in the URL example. http://xxx?form=4. I want to be able to read the value in the url and populate the hidden field on the form with that value.

Thank you

form data

Correct Answer

Dmitry Bastron answered on February 17, 2021 10:15

Hi Kim,

The following code in .ascx should work:

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

<script type="text/javascript">
    function getUrlParameter(name) {
        name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
        var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
        var results = regex.exec(location.search);
        return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
    };

    document.getElementById('<%# myHiddenField.ID %>').value =  getUrlParameter('yourUrlParameter');
</script>

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Recent Answers

Dmitry Bastron answered on February 14, 2021 17:47

Hi Kim,

Yes, it is definitely doable. What version of Kentico are you using? Is it web forms or MVC? Are you talking about form builder functionality or a custom form? Is it a multistep form or a single form on a page? It's really hard to guess from your question.