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  1. #1
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    Check/Uncheck all boxes using javascript

    I would like to add a button or checkbox to check/uncheck all. Note we are already using some javascript for custom checkboxes so it needs to integrate with that. Any help is appreciated.

    Here is the current javascript...

    Code:
    /*
    
    CUSTOM FORM ELEMENTS
    
    Created by Ryan Fait
    
    
    The only thing you need to change in this file is the following
    variables: checkboxHeight, radioHeight and selectWidth.
    
    Replace the first two numbers with the height of the checkbox and
    radio button. The actual height of both the checkbox and radio
    images should be 4 times the height of these two variables. The
    selectWidth value should be the width of your select list image.
    
    You may need to adjust your images a bit if there is a slight
    vertical movement during the different stages of the button
    activation.
    
    
    
    */
    
    var checkboxHeight = "47";
    var radioHeight = "25";
    var selectWidth = "190";
    
    /* No need to change anything after this */
    
    document.write('<style type="text/css">input.styled { display: none; } select.styled { position: relative; width: ' + selectWidth + 'px; opacity: 0; filter: alpha(opacity=0); z-index: 5; }</style>');
    
    var Custom = {
    	init: function() {
    		var inputs = document.getElementsByTagName("input"), span = Array(), textnode, option, active;
    		for(a = 0; a < inputs.length; a++) {
    			if((inputs[a].type == "checkbox" || inputs[a].type == "radio") && inputs[a].className == "styled") {
    				span[a] = document.createElement("span");
    				span[a].className = inputs[a].type;
    
    				if(inputs[a].checked == true) {
    					if(inputs[a].type == "checkbox") {
    						position = "0 -" + (checkboxHeight*2) + "px";
    						span[a].style.backgroundPosition = position;
    					} else {
    						position = "0 -" + (radioHeight*2) + "px";
    						span[a].style.backgroundPosition = position;
    					}
    				}
    				inputs[a].parentNode.insertBefore(span[a], inputs[a]);
    				inputs[a].onchange = Custom.clear;
    				span[a].onmousedown = Custom.pushed;
    				span[a].onmouseup = Custom.check;
    				document.onmouseup = Custom.clear;
    			}
    		}
    		inputs = document.getElementsByTagName("select");
    		for(a = 0; a < inputs.length; a++) {
    			if(inputs[a].className == "styled") {
    				option = inputs[a].getElementsByTagName("option");
    				active = option[0].childNodes[0].nodeValue;
    				textnode = document.createTextNode(active);
    				for(b = 0; b < option.length; b++) {
    					if(option[b].selected == true) {
    						textnode = document.createTextNode(option[b].childNodes[0].nodeValue);
    					}
    				}
    				span[a] = document.createElement("span");
    				span[a].className = "select";
    				span[a].id = "select" + inputs[a].name;
    				span[a].appendChild(textnode);
    				inputs[a].parentNode.insertBefore(span[a], inputs[a]);
    				inputs[a].onchange = Custom.choose;
    			}
    		}
    	},
    	pushed: function() {
    		element = this.nextSibling;
    		if(element.checked == true && element.type == "checkbox") {
    			this.style.backgroundPosition = "0 -" + checkboxHeight*3 + "px";
    		} else if(element.checked == true && element.type == "radio") {
    			this.style.backgroundPosition = "0 -" + radioHeight*3 + "px";
    		} else if(element.checked != true && element.type == "checkbox") {
    			this.style.backgroundPosition = "0 -" + checkboxHeight + "px";
    		} else {
    			this.style.backgroundPosition = "0 -" + radioHeight + "px";
    		}
    	},
    	check: function() {
    	
    		element = this.nextSibling;
    		if(element.checked == true && element.type == "checkbox") {
    			this.style.backgroundPosition = "0 0";
    			element.checked = false;
    		} else {
    			if(element.type == "checkbox") {
    				this.style.backgroundPosition = "0 -" + checkboxHeight*2 + "px";
    			} else {
    				this.style.backgroundPosition = "0 -" + radioHeight*2 + "px";
    				group = this.nextSibling.name;
    				inputs = document.getElementsByTagName("input");
    				for(a = 0; a < inputs.length; a++) {
    					if(inputs[a].name == group && inputs[a] != this.nextSibling) {
    						inputs[a].previousSibling.style.backgroundPosition = "0 0";
    					}
    				}
    			}
    			element.checked = true;
    		}
    	},
    	clear: function() {
    		inputs = document.getElementsByTagName("input");
    		for(var b = 0; b < inputs.length; b++) {
    			if(inputs[b].type == "checkbox" && inputs[b].checked == true && inputs[b].className == "styled") {
    				inputs[b].previousSibling.style.backgroundPosition = "0 -" + checkboxHeight*2 + "px";
    			} else if(inputs[b].type == "checkbox" && inputs[b].className == "styled") {
    				inputs[b].previousSibling.style.backgroundPosition = "0 0";
    			} else if(inputs[b].type == "radio" && inputs[b].checked == true && inputs[b].className == "styled") {
    				inputs[b].previousSibling.style.backgroundPosition = "0 -" + radioHeight*2 + "px";
    			} else if(inputs[b].type == "radio" && inputs[b].className == "styled") {
    				inputs[b].previousSibling.style.backgroundPosition = "0 0";
    			}
    		}
    	},
    	choose: function() {
    		option = this.getElementsByTagName("option");
    		for(d = 0; d < option.length; d++) {
    			if(option[d].selected == true) {
    				document.getElementById("select" + this.name).childNodes[0].nodeValue = option[d].childNodes[0].nodeValue;
    			}
    		}
    	}
    }
    window.onload = Custom.init;

  2. #2
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    paul_wilkins's Avatar
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    The following function should do you well:

    Code javascript:
    function checkAllCheckboxes(container, checkAll) {
        if (!container || !container.nodeName) {
            container = document;
        }
        var checkboxes = container.getElementsByTagName('input'),
            checkboxesLen = checkboxes.length,
            i,
            checked = checkAll ? true : null;
        for (i = 0; i < checkboxesLen; i += 1) {
            checkboxes[i].checked = checked;
        }
    }

    Here's how it can be used:

    Code html4strict:
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <title>Title</title>
    <style type="text/css">
        a { text-decoration: none; }
    </style>
    </head>
    <body>
    <form id="quiz">
        <p><a id="checkall" href="#check">Check all </a> / <a id="uncheckall" href="#uncheck">Uncheck all </a></p>
        <p>Question?</p>
        <p><input type="checkbox" id="answera" name="a"> <label for="answera">Answer A</label></p>
        <p><input type="checkbox" id="answerb" name="b"> <label for="answerb">Answer B</label></p>
        <p><input type="checkbox" id="answerc" name="c"> <label for="answerc">Answer C</label></p>
        <p><input type="checkbox" id="answerd" name="d"> <label for="answerd">Answer D</label></p>
        <p><input type="checkbox" id="answerall" name="all"> <label for="answerall">All the above</label></p>
    </form>
    <script type="text/javascript">
    document.getElementById('checkall').onclick = checkAll;
    document.getElementById('uncheckall').onclick = uncheckAll;
    document.getElementById('quiz').elements.all.onclick = toggleAll;
    function checkAll() {
        checkAllCheckboxes(this.form, true);
        return false;
    }
    function uncheckAll() {
        checkAllCheckboxes(this.form, false);
        return false;
    }
    function toggleAll() {
        checkAllCheckboxes(this.form, this.checked);
    }
    function checkAllCheckboxes(container, checkAll) {
        if (!container || !container.nodeName) {
            container = document;
        }
        var checkboxes = container.getElementsByTagName('input'),
            checkboxesLen = checkboxes.length,
            i,
            checked = checkAll ? true : null;
        for (i = 0; i < checkboxesLen; i += 1) {
            checkboxes[i].checked = checked;
        }
    }
    </script>
    </body>
    </html>
    Programming Group Advisor
    Reference: JavaScript, Quirksmode Validate: HTML Validation, JSLint
    Car is to Carpet as Java is to JavaScript

  3. #3
    SitePoint Member
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    Hi

    I am also using this script in the link below:

    www_bristolstreet_co_uk/page/find_a_dealer.htm

    and the error is appearing from this line:

    active = option[0].childNodes[0].nodeValue;

    Can anyone please help? I am a novice at Javascript but got this script working perfectly on my local machine - once I loaded it the live site it didn't work... any advice would be greatly appreciated.

  4. #4
    Unobtrusively zen silver trophybronze trophy
    paul_wilkins's Avatar
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    How to duplicate the error? Note, I'm currently using Google Chrome.
    Programming Group Advisor
    Reference: JavaScript, Quirksmode Validate: HTML Validation, JSLint
    Car is to Carpet as Java is to JavaScript

  5. #5
    SitePoint Member
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    The error is that there is no background image showing for the select box which I have defined as the background - select franchise at the moment doesnt show where to select it should have a graphic... any ideas?


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