Use this on addOnload funtion for each row.
jQuery("#id of checkbox").click(funtion(){
if(jQuery("#id of checkbox").is(":checked"){
jQuery("#id of text box").prop("disabled",true);
}
if(!jQuery("#id of checkbox").is(":checked"){
jQuery("#id of text box").prop("disabled",false);
}
});

https://community.qualtrics.com/XMcommunity/discussion/comment/54404#Comment_54404Hi, thanks for this. I've been trying to make this work and I keep running into an unexpected identifier error. I'm relatively new to this so if you have any suggestions on how to solve that I would greatly appreciate it! Here is the code I've been trying for the first row:

jQuery("#QR~QID38#1~1~1").click(funtion(){

if(jQuery("#QR~QID38#1~1~1").is(":checked"){

jQuery("#QR~QID38#2~1~1~TEXT").prop("disabled",true);

}

if(!jQuery("#QR~QID38#1~1~1").is(":checked"){

jQuery("#QR~QID38#2~1~1~TEXT").prop("disabled",false);

}

});

Since # ~ are special characters and used for different reason in jquery. So you will need to escape these special characters through double back slash \\\\. Please refer below.
jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").click(funtion(){
if(jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").is(":checked"){
jQuery("#QR\\\\~QID38\\\\#2\\\\~1\\\\~1\\\\~TEXT").prop("disabled",true);
}
if(!jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").is(":checked"){
jQuery("#QR\\\\~QID38\\\\#2\\\\~1\\\\~1\\\\~TEXT").prop("disabled",false);
}
});

https://community.qualtrics.com/XMcommunity/discussion/comment/54424#Comment_54424Thanks again, and thanks for helping me; I'm new to using Javascript to build my surveys! When I try this code, I keep getting an "unexpected identifier" code. Any suggestions?

There is a typo, spelling of function was wrong. Please check now.
jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").click(function(){
if(jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").is(":checked"){
jQuery("#QR\\\\~QID38\\\\#2\\\\~1\\\\~1\\\\~TEXT").prop("disabled",true);
}
if(!jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").is(":checked"){
jQuery("#QR\\\\~QID38\\\\#2\\\\~1\\\\~1\\\\~TEXT").prop("disabled",false);
}
});

https://community.qualtrics.com/XMcommunity/discussion/comment/54470#Comment_54470I'm still running into an error. I tried plugging that into an online syntax validator and it's flagging the "if" in "if(!jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").is(":checked"){" as an unexpected token. I'm not sure that's helpful.

Hi jtboelter
You can add following code inside your Qualtrics addoOnReady function in JS API to achieve the above task:
//access to the question div
let ques=document.getElementById('Questions');
//access to the text box
let text=document.querySelectorAll("input[type=text]");
               //access to the radio buttons
   let radio=document.querySelectorAll("inputStype=checkbox]");
               //validates if selected  is clicked and then disables the matching text box
ques.addEventListener("click", function(){
               for(let j=0;jif(radio�j].checked)
{textdj].disabled="true";
text[j].value="";} //if the respondent has entered any value so to clear the text box before submitting

 else
   {textxj].removeAttribute("disabled")} //enables the text box if option is deselected
   } });

Thanks qualtrics_nerd !! This did the trick. And thanks ArunDubey for following up to all of my questions.

Sorry jtboelter , as I was missing clossing ) brackets too under if condition in below script. As my laptop is not working and I was writing code through phone so I was not able to check it. You can try this once and let me know if it's working. Thanks!!

jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").click(function(){
if(jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").is(":checked")){
jQuery("#QR\\\\~QID38\\\\#2\\\\~1\\\\~1\\\\~TEXT").prop("disabled",true);
}
if(!jQuery("#QR\\\\~QID38\\\\#1\\\\~1\\\\~1").is(":checked")){
jQuery("#QR\\\\~QID38\\\\#2\\\\~1\\\\~1\\\\~TEXT").prop("disabled",false);
}
});