Using javascript to set a field (SharePoint 2013 edit item form)

Question

I am trying to use client side JScript to set a field, however I am not able to do so. Can someone look at the coding?

<script type="text/javascript">
function setRole() {
    if (ctx.CurrentItem["loggedonuser"].value = "i:0#.w|mickey.mouse") {
        // Setting the IMORole to Yes
        ctx.CurrentItem["IMORole"].value = "Yes";
    }
}

Thanks!

Answer 1

Your if condition is wrong. It should be:

if (ctx.CurrentItem["loggedonuser"].value === "i:0#.w|mickey.mouse") {
        // Setting the IMORole to Yes
        ctx.CurrentItem["IMORole"].value = "Yes";
}

Notice the comparison operator === .
= is for assignment and not comparison.

Update:

For finding out whether the value exists in an array or not, you could do one of the following:

1. Using jQuery - jQuery.inArray()
   var exists = $.inArray(value, array);

Example:

var userValue = ctx.CurrentItem["loggedonuser"].value;
var possibleValues = ["str1", "str2"];

var exists = $.inArray(userValue, possibleValues);
if (exists) {
    ctx.CurrentItem["loggedonuser"].value = "Yes";
}

2. Javascript - Array.prototype.indexOf()
   var exists = arrValues.indexOf('Sam') > -1;

Example:

var userValue = ctx.CurrentItem["loggedonuser"].value;
var possibleValues = ["str1", "str2"];

var exists = possibleValues.indexOf(userValue) > -1;
if (exists) {
    ctx.CurrentItem["loggedonuser"].value = "Yes";
}

3. Javascript (ES2016) - Array.prototype.includes()
   ["Sam", "Great", "Sample", "High"].includes("Sam");

Example:

var userValue = ctx.CurrentItem["loggedonuser"].value;
var possibleValues = ["str1", "str2"];

var exists = possibleValues.includes(userValue);
if (exists) {
    ctx.CurrentItem["loggedonuser"].value = "Yes";
}

Answer 2

The example below for your reference:

1.Create a custom list, add a Person or Group field "loggedonuser", add a Yes/No field "IMORole"(default value is No).

2.Add the code below into a script editor web part in the editform.aspx.

<script src="//code.jquery.com/jquery-3.2.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
    var loggedonuser=$("input[name^='loggedonuser'][name$='ClientPeoplePicker_HiddenInput']").val();
    if(loggedonuser.indexOf("i:0#.w|mickey.mouse")!=-1){
        $("input[title='IMORole']").prop('checked', true);
    }
});
</script>

To get current login name, we can also use REST API to achieve it.

<script src="//code.jquery.com/jquery-3.2.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
    var userid = _spPageContextInfo.userId;
    var loginName=getUserLoginName(userid);
    if(loginName=="i:0#.w|mickey.mouse"){
        $("input[title='IMORole']").prop('checked', true);
    }
});
function getUserLoginName(userId){
    var requestUri = _spPageContextInfo.webAbsoluteUrl + "/_api/web/getuserbyid(" + userId + ")";
    // execute AJAX request
    $.ajax({
        url: requestUri,
        type: "GET",
        async: false,
        headers: { "ACCEPT": "application/json;odata=verbose" },
        success: function (data) {
            loginName=data.d.LoginName;
        },
        error: function () {            
        }
    });
    return loginName;
}
</script>