10 examples of 'javascript check if id exists' in JavaScript

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21function hasId(id) {
22 //有此id返回true,否则返回false
23 var element = document.getElementById(id);
24 if (element) {
25 return true
26 } else {
27 return false
28 }
29}
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119function check(idStr){
120 var that = $("#"+idStr)
121 var parent = that.parent()
122 if(that.val().trim()==""){
123 var msg;
124 if(idStr=="name"){
125 msg = "名称不能为空"
126 }
127 that.addClass("is-invalid")
128 if(parent.children("[name='nameError']").length==0){
129 parent.append('<div name="nameError" class="invalid-feedback">'+msg+'</div>')
130 }
131 return false;
132 }else{
133 that.removeClass("is-invalid")
134 parent.children("[name='nameError']").remove();
135 return true
136 }
137}
15function _validateId(id) {
16 if (id && typeof id !== 'undefined' && parseInt(id) > 0) {
17 return true;
18 }
19
20 return false;
21}
55function setIdHasCheck(id, hasCheck) {
56 if (OS_ANDROID) {
57 $[id + 'Check'].visible = hasCheck;
58 } else {
59 $[id].hasCheck = hasCheck;
60 }
61}
205checkId (id) {
206 if (id in this.players) { return true; }
207 else { return false; }
208}
17function CheckExists(id) {
18 var idName = "assets/" + id.toLowerCase();
19 var idNoExt = idName.substring(0, idName.lastIndexOf("."));
20 return allFiles.hasOwnProperty(idName) || allAssets.hasOwnProperty(idNoExt);
21}
135isValidId(id) {
136 return id !== undefined && id !== 0 && id !== ''
137}
1function jsCheck(id)
2{
3 el=document.getElementById(id);
4 el.checked='checked';
5}
13function isValid(id) {
14 if (!id || !(typeof id === 'number' || id instanceof Number) && id.length !== 12 && id.length !== 24) {
15 return false;
16 }
17
18 if ((typeof id === 'string' || id instanceof String) && id.length === 24) {
19 return /^[0-9a-fA-F]{24}$/i.test(id);
20 }
21
22 return true;
23}
15function getId(id, callback) {
16
17 var filename = getFilename(id);
18
19 s3.getObject({
20 Bucket: settings.bucket,
21 Key: filename
22 }, function(error, data) {
23 if(error) {
24 if(error.code == 'NoSuchKey') {
25 callback({code:404,msgs:["Not Found"]});
26 } else {
27 callback({code:500,msgs:["S3 Retrieval Error"]});
28 }
29 } else {
30 callback(null,JSON.parse(data.Body));
31 }
32 });
33
34}

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