<apex:page standardController="Consum_Apply__c">
    <apex:includeScript value="{!URLFOR($Resource.qrcode)}"/>
<!--     <apex:includeScript value="{!URLFOR($Resource.connection20)}"/>
    <apex:includeScript value="{!URLFOR($Resource.apex20)}"/> -->
    <apex:includeScript value="/soap/ajax/46.0/connection.js"/>
    <apex:includeScript value="/soap/ajax/46.0/apex.js"/>

    <div id="qrcode"></div>
    <script type="text/javascript">
        function createAttachment() {
            var div = document.getElementById("qrcode");
            var img = div.getElementsByTagName("img");
            var src = img[0].src;
            src = src.substring(22, src.length);

            sforce.connection.sessionId = '{!GETSESSIONID()}';

            var record = sforce.connection.query("select id from Attachment where ParentId = \'{!Consum_Apply__c.Id}\' and name = \'QRCode-{!Consum_Apply__c.Name}\'");
            // 不存在qr文件时，新生成一个，并连到申请单上
            if (record.size == 0) {
                var atta = new sforce.SObject("Attachment");
                atta.Name = "QRCode-{!Consum_Apply__c.Name}";
                atta.ParentId = "{!Consum_Apply__c.Id}";
                atta.Body = src;
                var result = sforce.connection.create([atta]);

                var es = new sforce.SObject("Consum_Apply__c");
                es.Id = "{!Consum_Apply__c.Id}";
                es.QRId__c = result[0].id;
                result = sforce.connection.update([es]);
            }
            else {
                var records = record.getArray("records");
                // 存在qr时，绑到申请单上
                if(records[0].Id != "{!Consum_Apply__c.QRId__c}"){
                    var es = new sforce.SObject("Consum_Apply__c");
                    es.Id = "{!Consum_Apply__c.Id}";
                    es.QRId__c = records[0].Id;
                    result = sforce.connection.update([es]);
                }
            }
        }

        var qrcode = new QRCode(document.getElementById("qrcode"), {
            text: "{!Consum_Apply__c.Name}",
            width: 128,
            height: 128,
            colorDark : "#000000",
            colorLight : "#ffffff",
            correctLevel : QRCode.CorrectLevel.H
        });

        // qrcode生成後、Attachmentを作成
        setTimeout("createAttachment()", 1000);
    </script>
</apex:page>