appmaker - creating a link to the record in a completed form -

i pretty new app maker. have form user completes called creditapplication (it's linked datasource called creditapplication).
form has submit button. upon submission, want email link record completed emailed user.

i having trouble creating link. link bring emailed user same record in creditapplication form. have listed have below.

the creditapplication form has submit button onclick set to:

createrequest(widget). 

the creditapplication datasource has following code in oncreate event:

var = "jdoe@gmail.com"; var subject = "new online credit application submission - " + record.firstname + " (sales contact: " + record.salescontact + ")"; var msg = "a credit application has been submitted " + record.firstname + "." + "<br><br>"; var appurl = scriptapp.getservice().geturl() + '#creditapplication?requestid=' + record._key; msg = msg + appurl; mailapp.sendemail(to, subject, msg, {htmlbody: msg});    

my client javascript code in library called clientscripts , displayed below:

/**  * replaces url history state reflect changes upon navigation  *     different screen.  * @param {string} requestid - id of selected request.  */ function replaceurlforreadrequest(requestid) {   var params = {     requestid: requestid   };   google.script.history.replace(null, params, app.pages.newpage1.name); }  /**  * replaces url history state reflect changes upon navigation  *     different screen.  * @param {page} page - application page navigate.  */ function replaceurlforpage(page) {   var params = {};   google.script.history.replace(null, params, page.name); }  /**  * creates new request , redirects user read screen afterwards.  * @param {widget} submitbutton - button triggers action.  */ function createrequest(submitbutton) {   if (!submitbutton.root.validate()) {     return;   }   var newpage1 = app.pages.newpage1;   submitbutton.datasource.createitem(function(record) {         if (app.currentpage === newpage1) {       replaceurlforreadrequest(record._key);          }   });     app.showpage(newpage1);   replaceurlforpage(newpage1); } 

you can add url parameter identifies record before emailing url. when users retrieve page, use parameter adjust query filter load record.

url parameters can added url client script:

 /**  * adds url parameter.  * @param {string} name - name of url parameter;  * @param {string} value - value of url parameter;  */ function addurlparameter(name, value) {   google.script.url.getlocation(function(location) {     var params = location.parameter;     if (params[name]) {       console.log('url parameter exists');     } else {       console.log('adding url parameter');       params[name] = value;       google.script.history.replace({}, params);     }   }); } 

here example of onattach event handler. "project" name of datasource. uses built-in data field "key" set query filter.

/**  * loads record based on "key" parameter in url.  */ function loadpagebykey() {   google.script.url.getlocation(function(location) {     if ('key' in location.parameter) {       var datasource = app.datasources.project;       datasource.query.clearfilters();       datasource.query.filters.key._equals = location.parameter.key;       datasource.load(function() {         datasource.query.clearfilters();       });     }   }); }