javascript - Limit number of characters in input field with PHP -

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i'm creating database of people using this wordpress plugin. on signup form, want limit number of characters users can input in fields, don't know how, i'm not programmer , have limited knowledge of php , javascript. can't edit html directly since i'm using plugin, can't use maxlength html attribute. signup page based on following php template plugin, guess that's need edit, how?

<?php /*  * bootstrap template signup form  *  * outputs twitter bootstrap-compatible form  * http://twitter.github.com/bootstrap/index.html  * */ ?>  <div class="wrap <?php echo $this->wrap_class ?>" >    <?php // how html wrapper error messages can customized   $this->print_errors( '<div class="alert %1$s">%2$s</div>','<p>%s</p>' ); ?>    <?php $this->print_form_head(); // must included before fields output ?>      <div class="form-horizontal pdb-signup">       <?php while ( $this->have_groups() ) : $this->the_group(); ?>          <fieldset class="field-group field-group-<?php echo $this->group->name ?>">                 <?php $this->group->print_title( '<legend>', '</legend>' ) ?>                 <?php $this->group->print_description() ?>          <?php while ( $this->have_fields() ) : $this->the_field(); ?>         <?php $feedback_class = $this->field->has_error() ? 'error' : ''; ?>         <div class="<?php $this->field->print_element_class() ?> control-group <?php echo $feedback_class ?>">            <label class="control-label" for="<?php $this->field->print_element_id() ?>" ><?php $this->field->print_label(); // function adds required marker ?></label>           <div class="controls"><?php $this->field->print_element_with_id(); ?>                          <?php if ( $this->field->has_help_text() ) :?>              <span class="help-block">                 <?php $this->field->print_help_text() ?>              </span>             <?php endif ?>            </div>          </div>         <?php endwhile; // fields ?>          </fieldset>        <?php endwhile; // groups ?>       <fieldset class="field-group field-group-submit">        <div id="submit-button" class="controls">           <?php $this->print_submit_button('btn btn-primary'); // can specify class button ?>           <span class="pdb-retrieve-link"><?php $this->print_retrieve_link(__('forget private link? click here have emailed you.','participants-database')); ?></span>         </div>       </fieldset>     </div>   <?php $this->print_form_close() ?> </div>

find out id of input field , add following script file. 

<script type="text/javascript">        window.onload = function() {          jquery('#input_field_id').attr('maxlength','100');     } </script>

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