javascript - Variable Returning NaN Value - Cannot find out why -

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i having pickup in business left off many years ago aging texting system.

it built using asp classic , sends string api texts out, neither here nor there. problem have no js experience, am sql developer , did little bit of asp classic (vbscript) years ago.

this piece of jscript picks information several form boxes , places them in string passed variable on processing page text out. fields 'qvalue, indemnity , excess' numeric. cover text , replacing cover text 'nan' understand 'not number' is, not number want text string.

here snippet of code in question:

<script type="text/javascript"> function changemessagetext() {  var messagetxt = document.getelementbyid('message').value  var qvalue = document.getelementbyid('qvalue').value var cover = document.getelementbyid('cover').value var excess = document.getelementbyid('excess').value var indem = document.getelementbyid('indemnity').value  var messagetxt=messagetxt.replace("[qvalue]", + qvalue) var messagetxt=messagetxt.replace("[cover]", + cover2) var messagetxt=messagetxt.replace("[excess]", + excess) var messagetxt=messagetxt.replace("[indem]", + indem)  document.getelementbyid('messagetext').innerhtml = messagetxt;  } </script>

cheers.

when string.replace(searchvalue,newvalue), there no need of + before newvalue

var messagetxt=messagetxt.replace("[qvalue]", qvalue) //cover or cover2 whichever appropriate var messagetxt=messagetxt.replace("[cover]",  cover)   var messagetxt=messagetxt.replace("[excess]",  excess) var messagetxt=messagetxt.replace("[indem]",  indem)

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