How much worth does an unfilled text input box hold?

I've been working on integrating a search feature and I'm having an issue with the functionality. Below is the code snippets for both HTML and JS:

HTML

<form>
    <input type="text" ng-model="searchVar" class="searchbox">
    <input type="button" value="Search" ng-click="Search()" class="button">;
</form>

JS

var Search = function() {

// Code to load table content 
// The following snippet filters out table contents based on user input in the text field

     if (($scope.searchVar) && (tableContent[i].indexOf($scope.searchVar) !== -1)) {
          ItemsToDisplay.push(tableContent[i])
     }  
    // Call function to load table
}

Whenever I enter a search query in the text field, the search algorithm functions correctly and displays relevant items. However, when I clear the text field and click the Search button, the table remains empty. It seems like the ItemsToDisplay array is empty when the text field is cleared and the button is clicked, causing the if condition to fail.

I'm seeking assistance in understanding why this is happening and how I can resolve it. Any insights would be greatly appreciated!

Answer №1

Prior to using indexOf($searchVar), it is important to ensure that $searchVar is not an empty string. If it is, no items will be displayed afterwards. One helpful tip is to utilize the console.log feature in JavaScript, which can greatly assist you when working with if statements.

Answer №2

When you clear the input, the value of $scope.searchVar becomes undefined and your condition will evaluate to false:

if (($scope.searchVar) && (tableContent[i].indexOf($scope.searchVar) !== -1))         {...} 

As a result, nothing will be pushed into ItemsToDisplay.

One way to handle this is by adding an else statement:

if (($scope.searchVar) && (tableContent[i].indexOf($scope.searchVar) !== -1))         {...} 
else {
     ItemsToDisplay.push(tableContent[i]);
}

Answer №3

If you want to give it a shot, here's an option:

if (($scope.term) !== undefined) 

or

if (typeof ($scope.term) !== 'undefined') 

Answer №4

When the INPUT box is left empty, its value defaults to UNDEFINED. It is important to check in an if() condition whether the input is undefined or has a value, and then implement your logic accordingly.

<form>
        <input type="text" ng-model="searchVar" class="searchbox">
        <input type="button" value="Search" ng-click="Search()" class="button">
    </form>

    var Search = function() 
    {
         if ( $scope.searchVar == undefined){
            //Perform action when input box is undefined 
         } 
         if (($scope.searchVar) && (tableContent[i].indexOf($scope.searchVar) !== -1)) {
                            ItemsToDisplay.push(tableContent[i]);
         }
    }

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