Category: JavaScript Answers

Sometimes, we want to select where in array of _id with MongoDB.

In this article, we’ll look at how to select where in array of _id with MongoDB.

How to select where in array of _id with MongoDB?

To select where in array of _id with MongoDB, we can use the find method with the $in operator property.

For instance, we write

db.collection.find({ _id: { $in: [1, 2, 3, 4] } });

to call find with the _id.$in property set to an array of ID’s we’re looking for in the collection.

Conclusion

To select where in array of _id with MongoDB, we can use the find method with the $in operator property.

Sometimes, we want to change label text using JavaScript.

In this article, we’ll look at how to change label text using JavaScript.

How to change label text using JavaScript?

To change label text using JavaScript, we can select the label and set its innerHTML property.

For instance, we write

<label id="lbltipAddedComment">test</label>

to add a label element.

Then we write

document.getElementById("lbltipAddedComment").innerHTML = "success!";

to select the label with getElementById.

Then we set its innerHTML property to the label text we want.

We should run the JavaScript code after the label element is loaded.

Conclusion

To change label text using JavaScript, we can select the label and set its innerHTML property.

Sometimes, we want to perform a full text search in MongoDB and Mongoose and JavaScript.

In this article, we’ll look at how to perform a full text search in MongoDB and Mongoose and JavaScript.

How to perform a full text search in MongoDB and Mongoose and JavaScript?

To perform a full text search in MongoDB and Mongoose and JavaScript, we add indexes to the fields we want to search.

Then we can call find with the $search operator property to do the search.

For instance, we write

const schema = new Schema({
  name: String,
  email: String,
  profile: {
    something: String,
    somethingElse: String,
  },
});
schema.index({ name: "text", "profile.something": "text" });

to create a schema that has a few fields.

Then we add the indexes for the name and profile.something fields with the schema.index method.

Next, we do the search with

MyModel.find({ $text: { $search: searchString } })
  .skip(20)
  .limit(10)
  .exec((err, docs) => {
    //...
  });

to call find with the $text.$search properties set to searchString to search for searchString.

Then we call exec with a callback and get the results from docs.

Conclusion

To perform a full text search in MongoDB and Mongoose and JavaScript, we add indexes to the fields we want to search.

Then we can call find with the $search operator property to do the search.

To disable time in Bootstrap date time picker with JavaScript, we call the datetimepicker method with an object with the format property.

For instance, we write

<input data-format="yyyy-MM-dd" type="text" id="datetimepicker4" />

to add a date time picker input.

Then we write

$("#datetimepicker4").datetimepicker({
  format: "YYYY-MM-DD",
});

to select the input with $ and call datetimepicker with an object that sets the format to "YYYY-MM-DD".

The the time picker will be disabled in the date time picker.

Sometimes, we want to remove part of a string with JavaScript.

In this article, we’ll look at how to remove part of a string with JavaScript.

How to remove part of a string with JavaScript?

To remove part of a string with JavaScript, we call the string substring method.

For instance, we write

const str = "test_23";
alert(str.substring("test_".length));

to call str.substring with the starting index of the str string to return.

Then the alert box should show '23'.

Conclusion

To remove part of a string with JavaScript, we call the string substring method.