javascript - Adding HTML Button to Dynamics CRM 2016 Form -


what i'm attempting add html button trigger simple javascript function. onclick, want see if field contains value of 0.00 - if remove value. or, if field not contain data, add in value of 0.00 should alternate between 2 values. 

    <html>     <head>     </head>     <body>     <button onclick="recalc">re-calculate balance</button>       <script>       function recalc() {         var balancewriteoff = xrm.page.getattribute("jucy_balancewriteoff").getvalue();         if ((balancewriteoff) ==null)           xrm.page.getattribute("balancewriteoff").setvalue("0");           xrm.page.data.entity.save();         if ((balancewriteoff) =="0")           xrm.page.getattribute("jucy_balancewriteoff").setvalue(null);           xrm.page.data.entity.save();             return;     }     </script>     </body>     </html>

when try run on form html element has been placed. nothing happening. i've thrown in break points @ var , both if statements , i'm not getting break when i'm triggering onclick event.

i'm kind of stumped here. if has insights me awesome

to access crm form fields html web resource, add script html:

<script src="clientglobalcontext.js.aspx" type="text/javascript"></script>

and prepend "parent" xrm.page object:

parent.xrm.page.getattribute("jucy_balancewriteoff").getvalue();

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