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Thread: onclick Function Scrolling the Page?

  1. #1
    Join Date
    May 2010
    Posts
    5

    onclick Function Scrolling the Page?

    I an onclick event that pops up a calendar box to choose a date. When it is clicked, the page automatically scrolls down so the input box is at the top of the windows. It's not a very far move, so it's not a terrible inconvenience... it's just startling.

    Here is the code.

    Code:
    var ds_i_date = new Date();
    ds_c_month = ds_i_date.getMonth() + 1;
    ds_c_year = ds_i_date.getFullYear();
    
    // Get Element By Id
    function ds_getel(id) {
    	return document.getElementById(id);
    }
    
    // Get the left and the top of the element.
    function ds_getleft(el) {
    	var tmp = el.offsetLeft;
    	el = el.offsetParent
    	while(el) {
    		tmp += el.offsetLeft;
    		el = el.offsetParent;
    	}
    	return tmp;
    }
    function ds_gettop(el) {
    	var tmp = el.offsetTop;
    	el = el.offsetParent
    	while(el) {
    		tmp += el.offsetTop;
    		el = el.offsetParent;
    	}
    	return tmp;
    }
    
    // Output Element
    var ds_oe = ds_getel('ds_calclass');
    // Container
    var ds_ce = ds_getel('ds_conclass');
    
    // Output Buffering
    var ds_ob = ''; 
    function ds_ob_clean() {
    	ds_ob = '';
    }
    function ds_ob_flush() {
    	ds_oe.innerHTML = ds_ob;
    	ds_ob_clean();
    }
    function ds_echo(t) {
    	ds_ob += t;
    }
    
    var ds_element; // Text Element...
    
    var ds_monthnames = [
    'January', 'February', 'March', 'April', 'May', 'June',
    'July', 'August', 'September', 'October', 'November', 'December'
    ]; // You can translate it for your language.
    
    var ds_daynames = [
    'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'
    ]; // You can translate it for your language.
    
    // Calendar template
    function ds_template_main_above(t) {
    	return '<table cellpadding="3" cellspacing="1" class="ds_tbl">'
    	     + '<tr>'
    		 + '<td class="ds_head" style="cursor: pointer" onclick="ds_py();">&lt;&lt;</td>'
    		 + '<td class="ds_head" style="cursor: pointer" onclick="ds_pm();">&lt;</td>'
    		 + '<td class="ds_head" style="cursor: pointer" onclick="ds_hi();" colspan="3">[Close]</td>'
    		 + '<td class="ds_head" style="cursor: pointer" onclick="ds_nm();">&gt;</td>'
    		 + '<td class="ds_head" style="cursor: pointer" onclick="ds_ny();">&gt;&gt;</td>'
    		 + '</tr>'
    	     + '<tr>'
    		 + '<td colspan="7" class="ds_head">' + t + '</td>'
    		 + '</tr>'
    		 + '<tr>';
    }
    
    function ds_template_day_row(t) {
    	return '<td class="ds_subhead">' + t + '</td>';
    	// Define width in CSS, XHTML 1.0 Strict doesn't have width property for it.
    }
    
    function ds_template_new_week() {
    	return '</tr><tr>';
    }
    
    function ds_template_blank_cell(colspan) {
    	return '<td colspan="' + colspan + '"></td>'
    }
    
    function ds_template_day(d, m, y) {
    	return '<td class="ds_cell" onclick="ds_onclick(' + d + ',' + m + ',' + y + ')">' + d + '</td>';
    	// Define width the day row.
    }
    
    function ds_template_main_below() {
    	return '</tr>'
    	     + '</table>';
    }
    
    // This one draws calendar...
    function ds_draw_calendar(m, y) {
    	// First clean the output buffer.
    	ds_ob_clean();
    	// Here we go, do the header
    	ds_echo (ds_template_main_above(ds_monthnames[m - 1] + ' ' + y));
    	for (i = 0; i < 7; i ++) {
    		ds_echo (ds_template_day_row(ds_daynames[i]));
    	}
    	// Make a date object.
    	var ds_dc_date = new Date();
    	ds_dc_date.setMonth(m - 1);
    	ds_dc_date.setFullYear(y);
    	ds_dc_date.setDate(1);
    	if (m == 1 || m == 3 || m == 5 || m == 7 || m == 8 || m == 10 || m == 12) {
    		days = 31;
    	} else if (m == 4 || m == 6 || m == 9 || m == 11) {
    		days = 30;
    	} else {
    		days = (y % 4 == 0) ? 29 : 28;
    	}
    	var first_day = ds_dc_date.getDay();
    	var first_loop = 1;
    	// Start the first week
    	ds_echo (ds_template_new_week());
    	// If sunday is not the first day of the month, make a blank cell...
    	if (first_day != 0) {
    		ds_echo (ds_template_blank_cell(first_day));
    	}
    	var j = first_day;
    	for (i = 0; i < days; i ++) {
    		// Today is sunday, make a new week.
    		// If this sunday is the first day of the month,
    		// we've made a new row for you already.
    		if (j == 0 && !first_loop) {
    			// New week!!
    			ds_echo (ds_template_new_week());
    		}
    		// Make a row of that day!
    		ds_echo (ds_template_day(i + 1, m, y));
    		// This is not first loop anymore...
    		first_loop = 0;
    		// What is the next day?
    		j ++;
    		j %= 7;
    	}
    	// Do the footer
    	ds_echo (ds_template_main_below());
    	// And let's display..
    	ds_ob_flush();
    	// Scroll it into view.
    	ds_ce.scrollIntoView();
    }
    
    // A function to show the calendar.
    // When user click on the date, it will set the content of t.
    function ds_sh(t) {
    	// Set the element to set...
    	ds_element = t;
    	// Make a new date, and set the current month and year.
    	var ds_sh_date = new Date();
    	ds_c_month = ds_sh_date.getMonth() + 1;
    	ds_c_year = ds_sh_date.getFullYear();
    	// Draw the calendar
    	ds_draw_calendar(ds_c_month, ds_c_year);
    	// To change the position properly, we must show it first.
    	ds_ce.style.display = '';
    	// Move the calendar container!
    	the_left = ds_getleft(t);
    	the_top = ds_gettop(t) + t.offsetHeight;
    	ds_ce.style.left = the_left + 'px';
    	ds_ce.style.top = the_top + 'px';
    	// Scroll it into view.
    	ds_ce.scrollIntoView();
    }
    
    // Hide the calendar.
    function ds_hi() {
    	ds_ce.style.display = 'none';
    }
    
    // Moves to the next month...
    function ds_nm() {
    	// Increase the current month.
    	ds_c_month ++;
    	// We have passed December, let's go to the next year.
    	// Increase the current year, and set the current month to January.
    	if (ds_c_month > 12) {
    		ds_c_month = 1; 
    		ds_c_year++;
    	}
    	// Redraw the calendar.
    	ds_draw_calendar(ds_c_month, ds_c_year);
    }
    
    // Moves to the previous month...
    function ds_pm() {
    	ds_c_month = ds_c_month - 1; // Can't use dash-dash here, it will make the page invalid.
    	// We have passed January, let's go back to the previous year.
    	// Decrease the current year, and set the current month to December.
    	if (ds_c_month < 1) {
    		ds_c_month = 12; 
    		ds_c_year = ds_c_year - 1; // Can't use dash-dash here, it will make the page invalid.
    	}
    	// Redraw the calendar.
    	ds_draw_calendar(ds_c_month, ds_c_year);
    }
    
    // Moves to the next year...
    function ds_ny() {
    	// Increase the current year.
    	ds_c_year++;
    	// Redraw the calendar.
    	ds_draw_calendar(ds_c_month, ds_c_year);
    }
    
    // Moves to the previous year...
    function ds_py() {
    	// Decrease the current year.
    	ds_c_year = ds_c_year - 1; // Can't use dash-dash here, it will make the page invalid.
    	// Redraw the calendar.
    	ds_draw_calendar(ds_c_month, ds_c_year);
    }
    
    // Format the date to output.
    function ds_format_date(d, m, y) {
    	// 2 digits month.
    	m2 = '00' + m;
    	m2 = m2.substr(m2.length - 2);
    	// 2 digits day.
    	d2 = '00' + d;
    	d2 = d2.substr(d2.length - 2);
    	// YYYY-MM-DD
    	return y + '-' + m2 + '-' + d2;
    }
    
    // When the user clicks the day.
    function ds_onclick(d, m, y) {
    	// Hide the calendar.
    	ds_hi();
    	// Set the value of it, if we can.
    	if (typeof(ds_element.value) != 'undefined') {
    		ds_element.value = ds_format_date(d, m, y);
    	// Maybe we want to set the HTML in it.
    	} else if (typeof(ds_element.innerHTML) != 'undefined') {
    		ds_element.innerHTML = ds_format_date(d, m, y);
    	// I don't know how should we display it, just alert it to user.
    	} else {
    		alert (ds_format_date(d, m, y));
    	}
    }
    HTML Code:
    <input onclick="ds_sh(this);return true;" name="datebox" readonly="readonly" style="cursor:text"  />
    Any help would be greatly appreciated!

  2. #2
    Join Date
    Jul 2007
    Posts
    386
    Comment out this line:
    Code:
    ds_ce.scrollIntoView();
    (just add // in front)

  3. #3
    Join Date
    May 2010
    Posts
    5
    Herp...

    Thank you!

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