Disable checkbox when a picklist is selected

Question

Type is a picklist and reports is a checkbox. When a certain picklist is selected I want the checkbox to be disabled. I tried using an if statement but it does not work and I'm not sure why. Can anyone help? Thanks.

VisualForce page

<apex:page standardController="Account" extensions="getItems">    
  <apex:outputPanel layout="block" style="overflow:auto;width:500;height:180px">
   <apex:form styleClass="formId">
       <apex:pageblock id="table">

        <script>
        function openWindowPopup(bid,rid){

                var typeVal = document.getElementById(bid).value;

                var Reports = document.getElementById(rid).checked;



                if(typeVal = "type1"){
                    Reports.disabled = true;
                }
                else{
                    Reports.disabled = false;
                    }


            window.open('https://www.local.com?type='+typeVal+'&rprts='+Reports);

        }                           
        </script>


 <apex:pageblocktable id="pageBlockId" value="{!Assetitems}" var="lines" >     
            <apex:column >
                <apex:commandbutton value="Generate" reRender="table" onclick="openWindowPopup('{!$Component.mybid}''{!$Component.myrid}')" />       
            </apex:column>

                <apex:column headerValue="Type">
                    <apex:inputField value="{!Asset.Type__c}" id="mybid"/>
                </apex:column> 


                <apex:column headerValue="Reports">
                    <apex:inputField value="{!Asset.Reports__c}" id="myrid"/> 
                </apex:column> 

            </apex:pageblocktable>
        </apex:pageblock>
    </apex:form>
</apex:outputPanel>

Answer 1

Javascript uses the = operator as an assignment operator and the == operator as an equality test. Change this:

if(typeVal = "type1"){

To this:

if(typeVal == "type1"){

And things should work better.

EDIT Also, add a comma between your argument list in the function call, ie,

onclick="openWindowPopup('{!$Component.mybid}','{!$Component.myrid}')"

Finally, you need to work out wether you want to send a true or false to the window you are opening or set the checkbox disabled.

To actually disable the checkbox, you would code Reports.disabled = true assuming that you had a reference to the checkbox component.

To send a true or false to the window, you would need a reportsDisabled variable that reflects the value of the checkbox disabled state. See the code below:

    var typeVal = document.getElementById(bid).value;
var Reports = document.getElementById(rid);
var ReportsChecked = Reports.checked;

if(typeVal == "type1"){
    Reports.disabled = true;
}
else{
    Reports.disabled = false;
}   
window.open('https://www.local.com?type='+typeVal+'&rprts='+Reports.disabled); 

I have verified this works - I replicated your page.