External JavaScript script files are causing issues, whereas internal scripts are functioning properly

Question

External JavaScript script files are causing issues, whereas internal scripts are functioning properly

Currently, I am working on incorporating JavaScript validations for mandatory fields within a form located in an ASP.NET Web Application.

The process involves obtaining the ClientID of the control that requires validation, extracting its value, and checking if it is empty:

function validate()
{
    if(document.getElementById('<%=textbox1.clientID %>').value=="")
    {
        alert('This field is mandatory');
        return false;
    }
}

I have successfully tested this validation logic when placed directly within the page and triggered upon a button click event.

However, moving the code to an external JavaScript file resulted in unexpected behavior. The function does not execute as intended and instead throws an error message stating 'object not found at document.getElementByid() line'.

javascript asp.net

Answer 1

Answer №1

Consider enhancing your method by including a parameter. When calling an external method, make sure to add the '<%=textbox1.clientID %>' parameter as shown below.

<javascript>
     var param = document.getElementById('<%=textbox1.clientID %>').value;
     validate(param);
</javascript>

Answer 2

Consider enhancing your method by including a parameter. When calling an external method, make sure to add the '<%=textbox1.clientID %>' parameter as shown below.

<javascript>
     var param = document.getElementById('<%=textbox1.clientID %>').value;
     validate(param);
</javascript>

Answer 3

Answer №2

Your code is making a call to a server-side property called textbox1.ClientID in JavaScript. To move this code into a .js file, you need to first reference this server-side property in your .aspx file and then pass the retrieved value to your JavaScript function:

function callValidation() {
    return validation('<%= textbox1.ClientID %>');
}

Subsequently, your .js file should include the actual validation logic:

function validate(elementId)
{
    if(document.getElementById(elementId).value=="")
    {
        alert('This field is mandatory');
        return false;
    }
}

Answer 4

Your code is making a call to a server-side property called textbox1.ClientID in JavaScript. To move this code into a .js file, you need to first reference this server-side property in your .aspx file and then pass the retrieved value to your JavaScript function:

function callValidation() {
    return validation('<%= textbox1.ClientID %>');
}

Subsequently, your .js file should include the actual validation logic:

function validate(elementId)
{
    if(document.getElementById(elementId).value=="")
    {
        alert('This field is mandatory');
        return false;
    }
}

External JavaScript script files are causing issues, whereas internal scripts are functioning properly

Answer №1

Answer №2

Similar questions

When redirecting to a .scala.html file in Scala Play, only text is displayed, not the full

"Encountered a floating-point issue when trying to read an Excel file with

Using an alias to call a function defined in a separate module in TypeScript

Using the # symbol alongside other characters or numbers may prevent Reg Ex from validating

Enhance your web form with the Bootstrap 4 tags input feature that allows users to add tags exclusively

What is the method for retrieving a gzip file using jQuery?

What could be causing the error message "Why is property 'value' not found in null?" to appear in my code?

Comparing Selenium and Watir for JavaScript Testing within a Rails environment

Maintaining the original layout upon refreshing the page

Why does Res.send return an empty object when console.log indicates it is not empty?

Utilizing Animated GIFs as Textures in THREE.js

I am experiencing excessive paper skipping in my printer

What is the optimal placement for promises in Angular: Factory or Controller?

Are there any security risks in transmitting a password over HTTPS using jsonp?

Exploring location-based services using React-Redux

Establish a buffering system for the <video> element

Is there a way to implement a scrollbar that only scrolls through one specific column in an HTML table?

What could be the reason behind the malfunction of the sideNav function in bootstrap?

Using <Redirect/> in ReactJS results in rendering of a blank page

Can the characteristics of a group of objects be combined and sorted based on a different attribute?