Front-End Programming Exam > Front-End Programming Videos > Learn React JS: Fundamentals for Front-End Developers (in Urdu) > React JS In Urdu ~ Events (Part 3 of 8)
React JS In Urdu ~ Events (Part 3 of 8) Video Lecture | Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
FAQs on React JS In Urdu ~ Events (Part 3 of 8) Video Lecture - Learn React JS: Fundamentals for Front-End Developers (in Urdu) - Front-End Programming
| 1. React JS کیا ہے؟ |  |
Ans. React JS ایک JavaScript لائبریری ہے جو ویب ایپلیکیشنز کو بنانے کے لئے استعمال ہوتی ہے۔ یہ ایک component-based approach استعمال کرتی ہے جس میں مختلف components کو استعمال کر کے ویب ایپلیکیشن کو تشکیل دی جاتی ہے۔
| 2. React JS کے مقامی events کیا ہوتے ہیں؟ | |
Ans. React JS میں مقامی events وہ events ہوتے ہیں جو کسی specific element کے ساتھ منسلک ہوتے ہیں، مثلاً کسی button کے ساتھ کلک کرنا، input فیلڈ میں ٹائپ کرنا، موس کو کسی element پر لے جانا وغیرہ۔
| 3. React JS میں event handlers کیا ہوتے ہیں؟ | |
Ans. React JS میں event handlers functions ہوتے ہیں جو مقامی events کو handle کرتے ہیں۔ یہ functions اس element کو identify کرتے ہیں جس کے ساتھ event منسلک ہوا ہے اور اس کے بعد مخصوص action کو perform کرتے ہیں۔ مثلاً کسی button کے لئے onClick event handler استعمال کیا جا سکتا ہے جو بٹن پر کلک کرنے پر مخصوص action کو پرفارم کرتا ہے۔
| 4. React JS میں event propagation کیا ہوتی ہے؟ | |
Ans. Event propagation ایک وقت میں کئی elements پر مقامی event کو منتقل کرنے کی عمل ہے۔ React JS میں event propagation دو طریقوں سے ہوتی ہے: capturing اور bubbling۔ capturing میں event بالائی سے نیچے منتقل ہوتی ہے جبکہ bubbling میں event نیچے سے بالائی منتقل ہوتی ہے۔ React JS میں عموماً bubbling استعمال کی جاتی ہے۔
| 5. React JS میں event.preventDefault() کیا کرتا ہے؟ | |
Ans. event.preventDefault() event کو اسے default behavior سے روکتا ہے جو عموماً element کے ساتھ منسلک ہوتا ہے۔ مثلاً اگر ہم ایک فارم submit کرنے کے بعد صفحے کو ریفریش کرنے سے بچانا چاہتے ہیں، تو ہم onSubmit event کے ساتھ event.preventDefault() استعمال کرتے ہیں تاکہ صفحہ ریفریش نہ ہو۔
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Nov 25, 2024 Last updated |
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