Member Avatar for sravankolla

Hii

I am doing a project dealt with sending SMS ..
So i have to control the length of the message to be sent ..
But for textbox of Multiline type did not allowing the MaxLength property ..
Plz help me

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Dani AI

Generated

A practical, modern solution builds on ’s client-side idea but makes it robust for typing, pastes and older browsers: add the HTML5 maxlength as a progressive enhancement, use the input event for live enforcement and a remaining-character display, and always enforce the limit server-side before sending the SMS (client checks are convenience only). This addresses ’s need for a reliable length control for SMS.

Example (HTML + plain JavaScript):

<textarea id="message" maxlength="160" rows="5" cols="50"></textarea>
<div>Remaining: <span id="remaining">160</span></div>
<button id="send">Send</button>
<script>
(function(){
  var ta = document.getElementById('message');
  var rem = document.getElementById('remaining');
  var max = 160;

  function update(){
    if (ta.value.length > max) ta.value = ta.value.slice(0, max);
    rem.textContent = max - ta.value.length;
  }

  ta.addEventListener('input', update, false); // handles typing and paste
  update();
})();
</script>

Server-side validation (example in C#) — enforce the same rule on the server to prevent bypass:

if (string.IsNullOrEmpty(message) || message.Length > 160)
{
    // reject or return validation error before sending SMS
}

Notes and troubleshooting:

  • onchange fires on blur; input gives immediate feedback and handles paste/IME.
  • HTML5 maxlength works in modern browsers but keep the JS fallback for older ones.
  • SMS specifics matter: typical GSM 7-bit messages allow 160 chars, UCS-2 (non-GSM chars/emoji) 70 chars; concatenated messages reduce per-part capacity (commonly 153 / 67). For billing/segmenting accuracy, use the SMS gateway’s API or a proven library to calculate segments and encoding before sending.

Recommended Answers

All 2 Replies

Member Avatar for sedgey

why not use a javascript function fired by the onchange event to check the length and prevent additonal entry if the length exceeds the max allowable

Member Avatar for sravankolla

why not use a javascript function fired by the onchange event to check the length and prevent additonal entry if the length exceeds the max allowable

Thanks a lot Mr. sedgey

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