Mat Select Default Value Multiple

When using the mat select in multiple selection mode its value will be a sorted list of all selected values rather than a.

Mat select default value multiple. With angular material there is no selected property on mat option while there is a request to support this andrey kolybelnikov explains how this works. However there is no way to provide an option to select all options with a mat select component out of the box. Link multiple selection mat select defaults to single selection mode but can be configured to allow multiple selection by setting the multiple property. Refer how to start angular 6 step by step interfacecreator.

Material angular drop down as multi select with select all option using mat check box. Angular material select is created using mat select which is a form control for selecting a value from a set of options. Here we go for the steps to achieve material multi select drop down with select all checkbox mat checkbox. Before implementing this example create a new angular component with the name multiple.

Angular material select component has a multi select feature which allows users to check multiple options. To set and get a value for mat select use value ngmodel formcontrol and formcontrolname property. Use the deep shadow piercing descendant combinator to force a style down through the child component tree into all the child component views. Angular material select provides selectionchange event that emits when the selected value has been changed by the user.

Angular material uses mat select content as class name for the select list content. I am trying to set the value to default to one of the options however it is being left selected when the page renders. Depending on a use case it is good to know that initializing some default options as selected might not work by simply binding to the ngmodel because default values are different object instances than those in the options array. In this post we will create a custom option component for selecting all items in mat select.

The event selectionchange is used with mat select element as following. To make it multiple selections just add a multiple attribute to the mat select. To add elements to select option we need to use mat option element and to bind value with mat option use value property of it. This will allow the user to select multiple values at once.

Refer how to start material angular interfacecreator. Refer material angular basics material angular io. Using only mat select is the single selection mode by default.