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You need to follow bellow step to add form validation in angular 9.Example 1: Get Selected DropDown Value on Form Submit.Step 1: Import FormsModule.Step 2: Form with ngModel.Step 3: updated Ts File.Example 2: Get Selected DropDown Value on Change Event.Step 2: Form with ngModel.Step 3: updated Ts File.

The select tag in HTML is used to create a dropdown list of options that can be selected. The option tag contains the value that would be used when selected. The default value of the select element can be set by using the 'selected' attribute on the required option. This is a boolean attribute.

Get Dropdown Selected Value using JavaScriptfunction GetMaster1Details(){var value = document. getElementById("<%=ddlMaster1. ClientID%>");var getvalue = value. optionsvalue. selectedIndex. value;var gettext = value. optionsvalue. selectedIndex.alert("value:-" +" "+ getvalue + " "+ "Text:-" +" "+ gettext);}

How to set/show preselected value for drop down list in Excel?Create a drop down list.Then in the Data Validation dialog, under Settings tab, select List from Allow list, and then select the value you want to show in the drop down list to Source textbox.More items...

Assuming plain javascript, try the following in a script placed after the dropdown:const mySel = document. getElementById("theIDofYourSelect");mySel.localStorage.});let val = localStorage.if (val) mySel.// trigger the change in case there are other events on the select.mySel.

To retain the selected value in the dropdown on refresh, sessionStorage is used to store the value within the user's browser. First, the values have to be set using sessionStorage. setItem("SelItem", selVal); SelItem is a variable in which we are setting the value of selVal .

To achieve this, import the useState hook from React. Call setValue inside the handleSelect function to set the state variable to the value selected from the dropdown. Finally, output the current state value on the DOM inside your JSX.